From 7a0025673c3d0b9c4b773e72508831443bcbb071 Mon Sep 17 00:00:00 2001 From: topjohnwu Date: Thu, 6 Sep 2018 01:33:17 -0400 Subject: [PATCH] Use libsystemproperties in resetprop Upstream to latest Android Pie --- build.gradle | 2 +- gradle.properties | 3 - native/jni/Android.mk | 12 +- native/jni/Application.mk | 3 +- native/jni/include/utils.h | 12 +- .../resetprop/libsystemproperties/Android.mk | 15 + .../libsystemproperties/context_node.cpp | 98 + .../contexts_serialized.cpp | 172 ++ .../libsystemproperties/contexts_split.cpp | 363 ++++ .../include/async_safe/log.h | 4 + .../libsystemproperties/include/hacks.h | 14 + .../include/private/ErrnoRestorer.h | 43 + .../include}/private/bionic_futex.h | 31 +- .../include}/private/bionic_lock.h | 23 +- .../include/private/bionic_macros.h | 105 ++ .../property_info_parser.h | 224 +++ .../include/system_properties/context_node.h | 67 + .../include/system_properties/contexts.h | 45 + .../system_properties/contexts_pre_split.h | 69 + .../system_properties/contexts_serialized.h | 61 + .../system_properties/contexts_split.h | 59 + .../include/system_properties/prop_area.h | 162 ++ .../include/system_properties/prop_info.h | 90 + .../system_properties/system_properties.h | 89 + .../libsystemproperties/prop_area.cpp | 373 ++++ .../libsystemproperties/prop_info.cpp | 55 + .../property_info_parser.cpp | 246 +++ .../libsystemproperties/system_properties.cpp | 370 ++++ .../{persist_props.c => persist_properties.c} | 0 .../resetprop/private/_system_properties.h | 27 +- native/jni/resetprop/private/bionic_defs.h | 39 + native/jni/resetprop/private/bionic_macros.h | 42 +- native/jni/resetprop/private/futex.h | 77 - native/jni/resetprop/private/redefs.h | 1 + native/jni/resetprop/private/stdatomic.h | 370 ---- .../jni/resetprop/private/system_properties.h | 28 +- native/jni/resetprop/private/xattr.h | 61 - native/jni/resetprop/system_properties.cpp | 1569 ----------------- native/jni/resetprop/system_property_api.cpp | 126 ++ native/jni/resetprop/system_property_set.cpp | 317 ++++ native/jni/utils/misc.c | 153 +- 41 files changed, 3404 insertions(+), 2216 deletions(-) create mode 100644 native/jni/resetprop/libsystemproperties/Android.mk create mode 100644 native/jni/resetprop/libsystemproperties/context_node.cpp create mode 100644 native/jni/resetprop/libsystemproperties/contexts_serialized.cpp create mode 100644 native/jni/resetprop/libsystemproperties/contexts_split.cpp create mode 100644 native/jni/resetprop/libsystemproperties/include/async_safe/log.h create mode 100644 native/jni/resetprop/libsystemproperties/include/hacks.h create mode 100644 native/jni/resetprop/libsystemproperties/include/private/ErrnoRestorer.h rename native/jni/resetprop/{ => libsystemproperties/include}/private/bionic_futex.h (74%) rename native/jni/resetprop/{ => libsystemproperties/include}/private/bionic_lock.h (88%) create mode 100644 native/jni/resetprop/libsystemproperties/include/private/bionic_macros.h create mode 100644 native/jni/resetprop/libsystemproperties/include/property_info_parser/property_info_parser.h create mode 100644 native/jni/resetprop/libsystemproperties/include/system_properties/context_node.h create mode 100644 native/jni/resetprop/libsystemproperties/include/system_properties/contexts.h create mode 100644 native/jni/resetprop/libsystemproperties/include/system_properties/contexts_pre_split.h create mode 100644 native/jni/resetprop/libsystemproperties/include/system_properties/contexts_serialized.h create mode 100644 native/jni/resetprop/libsystemproperties/include/system_properties/contexts_split.h create mode 100644 native/jni/resetprop/libsystemproperties/include/system_properties/prop_area.h create mode 100644 native/jni/resetprop/libsystemproperties/include/system_properties/prop_info.h create mode 100644 native/jni/resetprop/libsystemproperties/include/system_properties/system_properties.h create mode 100644 native/jni/resetprop/libsystemproperties/prop_area.cpp create mode 100644 native/jni/resetprop/libsystemproperties/prop_info.cpp create mode 100644 native/jni/resetprop/libsystemproperties/property_info_parser.cpp create mode 100644 native/jni/resetprop/libsystemproperties/system_properties.cpp rename native/jni/resetprop/{persist_props.c => persist_properties.c} (100%) create mode 100644 native/jni/resetprop/private/bionic_defs.h delete mode 100644 native/jni/resetprop/private/futex.h delete mode 100644 native/jni/resetprop/private/stdatomic.h delete mode 100644 native/jni/resetprop/private/xattr.h delete mode 100644 native/jni/resetprop/system_properties.cpp create mode 100644 native/jni/resetprop/system_property_api.cpp create mode 100644 native/jni/resetprop/system_property_set.cpp diff --git a/build.gradle b/build.gradle index d9166d86d..08d100a44 100644 --- a/build.gradle +++ b/build.gradle @@ -7,7 +7,7 @@ buildscript { jcenter() } dependencies { - classpath 'com.android.tools.build:gradle:3.1.4' + classpath 'com.android.tools.build:gradle:3.2.0-rc02' // NOTE: Do not place your application dependencies here; they belong diff --git a/gradle.properties b/gradle.properties index f073d9ad1..d13e92712 100644 --- a/gradle.properties +++ b/gradle.properties @@ -20,6 +20,3 @@ org.gradle.parallel=true # When set to true the Gradle daemon is used to run the build. For local developer builds this is our favorite property. # The developer environment is optimized for speed and feedback so we nearly always run Gradle jobs with the daemon. org.gradle.daemon=true - -# Configuration on demand is not supported by the current version of the Android Gradle plugin since you are using Gradle version 4.6 or above -org.gradle.configureondemand=false diff --git a/native/jni/Android.mk b/native/jni/Android.mk index 16ae1b970..ef01795f3 100644 --- a/native/jni/Android.mk +++ b/native/jni/Android.mk @@ -10,6 +10,7 @@ LIBLZ4 := $(EXT_PATH)/lz4/lib LIBBZ2 := $(EXT_PATH)/bzip2 LIBFDT := $(EXT_PATH)/dtc/libfdt LIBNANOPB := $(EXT_PATH)/nanopb +LIBSYSTEMPROPERTIES := jni/resetprop/libsystemproperties/include COMMON_UTILS := \ utils/file.c \ utils/list.c \ @@ -27,13 +28,14 @@ ifdef B_MAGISK include $(CLEAR_VARS) LOCAL_MODULE := magisk LOCAL_SHARED_LIBRARIES := libsqlite libselinux -LOCAL_STATIC_LIBRARIES := libnanopb +LOCAL_STATIC_LIBRARIES := libnanopb libsystemproperties LOCAL_C_INCLUDES := \ jni/include \ jni/magiskpolicy \ $(EXT_PATH)/include \ $(LIBSELINUX) \ - $(LIBNANOPB) + $(LIBNANOPB) \ + $(LIBSYSTEMPROPERTIES) LOCAL_SRC_FILES := \ core/magisk.c \ @@ -45,9 +47,10 @@ LOCAL_SRC_FILES := \ magiskhide/magiskhide.c \ magiskhide/proc_monitor.c \ magiskhide/hide_utils.c \ - resetprop/persist_props.c \ + resetprop/persist_properties.c \ resetprop/resetprop.c \ - resetprop/system_properties.cpp \ + resetprop/system_property_api.cpp \ + resetprop/system_property_set.cpp \ su/su.c \ su/activity.c \ su/pts.c \ @@ -145,3 +148,4 @@ endif # Externals ######################## include jni/external/Android.mk +include jni/resetprop/libsystemproperties/Android.mk diff --git a/native/jni/Application.mk b/native/jni/Application.mk index 0d576c3bb..2d00194ec 100644 --- a/native/jni/Application.mk +++ b/native/jni/Application.mk @@ -1,7 +1,8 @@ APP_ABI := armeabi-v7a x86 APP_CFLAGS := -std=gnu99 ${MAGISK_DEBUG} \ -DMAGISK_VERSION="${MAGISK_VERSION}" -DMAGISK_VER_CODE=${MAGISK_VER_CODE} -APP_CPPFLAGS := -std=c++11 +APP_CPPFLAGS := -std=c++14 +APP_STL := system APP_PLATFORM := android-16 APP_CFLAGS += -Wno-implicit-function-declaration diff --git a/native/jni/include/utils.h b/native/jni/include/utils.h index f9875413d..fd9db3086 100644 --- a/native/jni/include/utils.h +++ b/native/jni/include/utils.h @@ -82,8 +82,6 @@ pid_t xfork(); // misc.c #define quit_signals ((int []) { SIGALRM, SIGABRT, SIGHUP, SIGPIPE, SIGQUIT, SIGTERM, SIGINT, 0 }) -#define getline my_getline -#define getdelim my_getdelim unsigned get_shell_uid(); unsigned get_system_uid(); @@ -92,8 +90,6 @@ int check_data(); int file_to_vector(const char* filename, struct vector *v); int vector_to_file(const char* filename, struct vector *v); ssize_t fdgets(char *buf, size_t size, int fd); -ssize_t my_getline(char **lineptr, size_t *n, FILE *stream); -ssize_t my_getdelim(char **lineptr, size_t *n, int delim, FILE *stream); void ps(void (*func)(int)); int check_proc_name(int pid, const char *filter); void unlock_blocks(); @@ -109,6 +105,14 @@ void wait_till_exists(const char *target); void gen_rand_str(char *buf, int len); int strend(const char *s1, const char *s2); +#define getline __getline +#define getdelim __getdelim +#define fsetxattr __fsetxattr + +ssize_t __getline(char **lineptr, size_t *n, FILE *stream); +ssize_t __getdelim(char **lineptr, size_t *n, int delim, FILE *stream); +int __fsetxattr(int fd, const char *name, const void *value, size_t size, int flags); + // file.c #define align(p, a) (((p) + (a) - 1) / (a) * (a)) diff --git a/native/jni/resetprop/libsystemproperties/Android.mk b/native/jni/resetprop/libsystemproperties/Android.mk new file mode 100644 index 000000000..66788f014 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/Android.mk @@ -0,0 +1,15 @@ +LOCAL_PATH := $(call my-dir) + +include $(CLEAR_VARS) +LOCAL_MODULE:= libsystemproperties +LOCAL_C_INCLUDES := $(LIBSYSTEMPROPERTIES) +LOCAL_SRC_FILES := \ + context_node.cpp \ + contexts_serialized.cpp \ + contexts_split.cpp \ + prop_area.cpp \ + prop_info.cpp \ + system_properties.cpp \ + property_info_parser.cpp + +include $(BUILD_STATIC_LIBRARY) diff --git a/native/jni/resetprop/libsystemproperties/context_node.cpp b/native/jni/resetprop/libsystemproperties/context_node.cpp new file mode 100644 index 000000000..d392c0ad5 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/context_node.cpp @@ -0,0 +1,98 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "system_properties/context_node.h" + +#include +#include + +#include + +#include "system_properties/system_properties.h" + +// pthread_mutex_lock() calls into system_properties in the case of contention. +// This creates a risk of dead lock if any system_properties functions +// use pthread locks after system_property initialization. +// +// For this reason, the below three functions use a bionic Lock and static +// allocation of memory for each filename. + +bool ContextNode::Open(bool access_rw, bool* fsetxattr_failed) { + lock_.lock(); + if (pa_) { + lock_.unlock(); + return true; + } + + char filename[PROP_FILENAME_MAX]; + int len = async_safe_format_buffer(filename, sizeof(filename), "%s/%s", filename_, context_); + if (len < 0 || len >= PROP_FILENAME_MAX) { + lock_.unlock(); + return false; + } + + if (access_rw) { + pa_ = prop_area::map_prop_area_rw(filename, context_, fsetxattr_failed); + } else { + pa_ = prop_area::map_prop_area(filename); + } + lock_.unlock(); + return pa_; +} + +bool ContextNode::CheckAccessAndOpen() { + if (!pa_ && !no_access_) { + if (!CheckAccess() || !Open(false, nullptr)) { + no_access_ = true; + } + } + return pa_; +} + +void ContextNode::ResetAccess() { + if (!CheckAccess()) { + Unmap(); + no_access_ = true; + } else { + no_access_ = false; + } +} + +bool ContextNode::CheckAccess() { + char filename[PROP_FILENAME_MAX]; + int len = async_safe_format_buffer(filename, sizeof(filename), "%s/%s", filename_, context_); + if (len < 0 || len >= PROP_FILENAME_MAX) { + return false; + } + + return access(filename, R_OK) == 0; +} + +void ContextNode::Unmap() { + prop_area::unmap_prop_area(&pa_); +} diff --git a/native/jni/resetprop/libsystemproperties/contexts_serialized.cpp b/native/jni/resetprop/libsystemproperties/contexts_serialized.cpp new file mode 100644 index 000000000..6ccd46c99 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/contexts_serialized.cpp @@ -0,0 +1,172 @@ +/* + * Copyright (C) 2017 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "system_properties/contexts_serialized.h" + +#include +#include +#include +#include +#include +#include + +#include + +#include + +#include "system_properties/system_properties.h" + +bool ContextsSerialized::InitializeContextNodes() { + auto num_context_nodes = property_info_area_file_->num_contexts(); + auto context_nodes_mmap_size = sizeof(ContextNode) * num_context_nodes; + // We want to avoid malloc in system properties, so we take an anonymous map instead (b/31659220). + void* const map_result = mmap(nullptr, context_nodes_mmap_size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + if (map_result == MAP_FAILED) { + return false; + } + + prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, map_result, context_nodes_mmap_size, + "System property context nodes"); + + context_nodes_ = reinterpret_cast(map_result); + num_context_nodes_ = num_context_nodes; + context_nodes_mmap_size_ = context_nodes_mmap_size; + + for (size_t i = 0; i < num_context_nodes; ++i) { + new (&context_nodes_[i]) ContextNode(property_info_area_file_->context(i), filename_); + } + + return true; +} + +bool ContextsSerialized::MapSerialPropertyArea(bool access_rw, bool* fsetxattr_failed) { + char filename[PROP_FILENAME_MAX]; + int len = async_safe_format_buffer(filename, sizeof(filename), "%s/properties_serial", filename_); + if (len < 0 || len >= PROP_FILENAME_MAX) { + serial_prop_area_ = nullptr; + return false; + } + + if (access_rw) { + serial_prop_area_ = + prop_area::map_prop_area_rw(filename, "u:object_r:properties_serial:s0", fsetxattr_failed); + } else { + serial_prop_area_ = prop_area::map_prop_area(filename); + } + return serial_prop_area_; +} + +bool ContextsSerialized::InitializeProperties() { + if (!property_info_area_file_.LoadDefaultPath()) { + return false; + } + + if (!InitializeContextNodes()) { + FreeAndUnmap(); + return false; + } + + return true; +} + +bool ContextsSerialized::Initialize(bool writable, const char* filename, bool* fsetxattr_failed) { + filename_ = filename; + if (!InitializeProperties()) { + return false; + } + + if (writable) { + mkdir(filename_, S_IRWXU | S_IXGRP | S_IXOTH); + bool open_failed = false; + if (fsetxattr_failed) { + *fsetxattr_failed = false; + } + + for (size_t i = 0; i < num_context_nodes_; ++i) { + if (!context_nodes_[i].Open(true, fsetxattr_failed)) { + open_failed = true; + } + } + if (open_failed || !MapSerialPropertyArea(true, fsetxattr_failed)) { + FreeAndUnmap(); + return false; + } + } else { + if (!MapSerialPropertyArea(false, nullptr)) { + FreeAndUnmap(); + return false; + } + } + return true; +} + +prop_area* ContextsSerialized::GetPropAreaForName(const char* name) { + uint32_t index; + property_info_area_file_->GetPropertyInfoIndexes(name, &index, nullptr); + if (index == ~0u || index >= num_context_nodes_) { + async_safe_format_log(ANDROID_LOG_ERROR, "libc", "Could not find context for property \"%s\"", + name); + return nullptr; + } + auto* context_node = &context_nodes_[index]; + if (!context_node->pa()) { + // We explicitly do not check no_access_ in this case because unlike the + // case of foreach(), we want to generate an selinux audit for each + // non-permitted property access in this function. + context_node->Open(false, nullptr); + } + return context_node->pa(); +} + +void ContextsSerialized::ForEach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) { + for (size_t i = 0; i < num_context_nodes_; ++i) { + if (context_nodes_[i].CheckAccessAndOpen()) { + context_nodes_[i].pa()->foreach (propfn, cookie); + } + } +} + +void ContextsSerialized::ResetAccess() { + for (size_t i = 0; i < num_context_nodes_; ++i) { + context_nodes_[i].ResetAccess(); + } +} + +void ContextsSerialized::FreeAndUnmap() { + property_info_area_file_.Reset(); + if (context_nodes_ != nullptr) { + for (size_t i = 0; i < num_context_nodes_; ++i) { + context_nodes_[i].Unmap(); + } + munmap(context_nodes_, context_nodes_mmap_size_); + context_nodes_ = nullptr; + } + prop_area::unmap_prop_area(&serial_prop_area_); + serial_prop_area_ = nullptr; +} diff --git a/native/jni/resetprop/libsystemproperties/contexts_split.cpp b/native/jni/resetprop/libsystemproperties/contexts_split.cpp new file mode 100644 index 000000000..11db7ec68 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/contexts_split.cpp @@ -0,0 +1,363 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "system_properties/contexts_split.h" + +#include +#include +#include +#include +#include + +#include + +#include "system_properties/context_node.h" +#include "system_properties/system_properties.h" + +class ContextListNode : public ContextNode { + public: + ContextListNode(ContextListNode* next, const char* context, const char* filename) + : ContextNode(strdup(context), filename), next(next) { + } + + ~ContextListNode() { + free(const_cast(context())); + } + + ContextListNode* next; +}; + +struct PrefixNode { + PrefixNode(struct PrefixNode* next, const char* prefix, ContextListNode* context) + : prefix(strdup(prefix)), prefix_len(strlen(prefix)), context(context), next(next) { + } + ~PrefixNode() { + free(prefix); + } + char* prefix; + const size_t prefix_len; + ContextListNode* context; + PrefixNode* next; +}; + +template +static inline void ListAdd(List** list, Args... args) { + *list = new List(*list, args...); +} + +static void ListAddAfterLen(PrefixNode** list, const char* prefix, ContextListNode* context) { + size_t prefix_len = strlen(prefix); + + auto next_list = list; + + while (*next_list) { + if ((*next_list)->prefix_len < prefix_len || (*next_list)->prefix[0] == '*') { + ListAdd(next_list, prefix, context); + return; + } + next_list = &(*next_list)->next; + } + ListAdd(next_list, prefix, context); +} + +template +static void ListForEach(List* list, Func func) { + while (list) { + func(list); + list = list->next; + } +} + +template +static List* ListFind(List* list, Func func) { + while (list) { + if (func(list)) { + return list; + } + list = list->next; + } + return nullptr; +} + +template +static void ListFree(List** list) { + while (*list) { + auto old_list = *list; + *list = old_list->next; + delete old_list; + } +} + +// The below two functions are duplicated from label_support.c in libselinux. +// TODO: Find a location suitable for these functions such that both libc and +// libselinux can share a common source file. + +// The read_spec_entries and read_spec_entry functions may be used to +// replace sscanf to read entries from spec files. The file and +// property services now use these. + +// Read an entry from a spec file (e.g. file_contexts) +static inline int read_spec_entry(char** entry, char** ptr, int* len) { + *entry = nullptr; + char* tmp_buf = nullptr; + + while (isspace(**ptr) && **ptr != '\0') (*ptr)++; + + tmp_buf = *ptr; + *len = 0; + + while (!isspace(**ptr) && **ptr != '\0') { + (*ptr)++; + (*len)++; + } + + if (*len) { + *entry = strndup(tmp_buf, *len); + if (!*entry) return -1; + } + + return 0; +} + +// line_buf - Buffer containing the spec entries . +// num_args - The number of spec parameter entries to process. +// ... - A 'char **spec_entry' for each parameter. +// returns - The number of items processed. +// +// This function calls read_spec_entry() to do the actual string processing. +static int read_spec_entries(char* line_buf, int num_args, ...) { + char **spec_entry, *buf_p; + int len, rc, items, entry_len = 0; + va_list ap; + + len = strlen(line_buf); + if (line_buf[len - 1] == '\n') + line_buf[len - 1] = '\0'; + else + // Handle case if line not \n terminated by bumping + // the len for the check below (as the line is NUL + // terminated by getline(3)) + len++; + + buf_p = line_buf; + while (isspace(*buf_p)) buf_p++; + + // Skip comment lines and empty lines. + if (*buf_p == '#' || *buf_p == '\0') return 0; + + // Process the spec file entries + va_start(ap, num_args); + + items = 0; + while (items < num_args) { + spec_entry = va_arg(ap, char**); + + if (len - 1 == buf_p - line_buf) { + va_end(ap); + return items; + } + + rc = read_spec_entry(spec_entry, &buf_p, &entry_len); + if (rc < 0) { + va_end(ap); + return rc; + } + if (entry_len) items++; + } + va_end(ap); + return items; +} + +bool ContextsSplit::MapSerialPropertyArea(bool access_rw, bool* fsetxattr_failed) { + char filename[PROP_FILENAME_MAX]; + int len = async_safe_format_buffer(filename, sizeof(filename), "%s/properties_serial", filename_); + if (len < 0 || len >= PROP_FILENAME_MAX) { + serial_prop_area_ = nullptr; + return false; + } + + if (access_rw) { + serial_prop_area_ = + prop_area::map_prop_area_rw(filename, "u:object_r:properties_serial:s0", fsetxattr_failed); + } else { + serial_prop_area_ = prop_area::map_prop_area(filename); + } + return serial_prop_area_; +} + +bool ContextsSplit::InitializePropertiesFromFile(const char* filename) { + FILE* file = fopen(filename, "re"); + if (!file) { + return false; + } + + char* buffer = nullptr; + size_t line_len; + char* prop_prefix = nullptr; + char* context = nullptr; + + while (getline(&buffer, &line_len, file) > 0) { + int items = read_spec_entries(buffer, 2, &prop_prefix, &context); + if (items <= 0) { + continue; + } + if (items == 1) { + free(prop_prefix); + continue; + } + + // init uses ctl.* properties as an IPC mechanism and does not write them + // to a property file, therefore we do not need to create property files + // to store them. + if (!strncmp(prop_prefix, "ctl.", 4)) { + free(prop_prefix); + free(context); + continue; + } + + auto old_context = ListFind( + contexts_, [context](ContextListNode* l) { return !strcmp(l->context(), context); }); + if (old_context) { + ListAddAfterLen(&prefixes_, prop_prefix, old_context); + } else { + ListAdd(&contexts_, context, filename_); + ListAddAfterLen(&prefixes_, prop_prefix, contexts_); + } + free(prop_prefix); + free(context); + } + + free(buffer); + fclose(file); + + return true; +} + +bool ContextsSplit::InitializeProperties() { + // If we do find /property_contexts, then this is being + // run as part of the OTA updater on older release that had + // /property_contexts - b/34370523 + if (InitializePropertiesFromFile("/property_contexts")) { + return true; + } + + // Use property_contexts from /system & /vendor, fall back to those from / + if (access("/system/etc/selinux/plat_property_contexts", R_OK) != -1) { + if (!InitializePropertiesFromFile("/system/etc/selinux/plat_property_contexts")) { + return false; + } + // Don't check for failure here, so we always have a sane list of properties. + // E.g. In case of recovery, the vendor partition will not have mounted and we + // still need the system / platform properties to function. + if (access("/vendor/etc/selinux/vendor_property_contexts", R_OK) != -1) { + InitializePropertiesFromFile("/vendor/etc/selinux/vendor_property_contexts"); + } else { + // Fallback to nonplat_* if vendor_* doesn't exist. + InitializePropertiesFromFile("/vendor/etc/selinux/nonplat_property_contexts"); + } + } else { + if (!InitializePropertiesFromFile("/plat_property_contexts")) { + return false; + } + if (access("/vendor_property_contexts", R_OK) != -1) { + InitializePropertiesFromFile("/vendor_property_contexts"); + } else { + // Fallback to nonplat_* if vendor_* doesn't exist. + InitializePropertiesFromFile("/nonplat_property_contexts"); + } + } + + return true; +} + +bool ContextsSplit::Initialize(bool writable, const char* filename, bool* fsetxattr_failed) { + filename_ = filename; + if (!InitializeProperties()) { + return false; + } + + if (writable) { + mkdir(filename_, S_IRWXU | S_IXGRP | S_IXOTH); + bool open_failed = false; + if (fsetxattr_failed) { + *fsetxattr_failed = false; + } + + ListForEach(contexts_, [&fsetxattr_failed, &open_failed](ContextListNode* l) { + if (!l->Open(true, fsetxattr_failed)) { + open_failed = true; + } + }); + if (open_failed || !MapSerialPropertyArea(true, fsetxattr_failed)) { + FreeAndUnmap(); + return false; + } + } else { + if (!MapSerialPropertyArea(false, nullptr)) { + FreeAndUnmap(); + return false; + } + } + return true; +} + +prop_area* ContextsSplit::GetPropAreaForName(const char* name) { + auto entry = ListFind(prefixes_, [name](PrefixNode* l) { + return l->prefix[0] == '*' || !strncmp(l->prefix, name, l->prefix_len); + }); + if (!entry) { + return nullptr; + } + + auto cnode = entry->context; + if (!cnode->pa()) { + // We explicitly do not check no_access_ in this case because unlike the + // case of foreach(), we want to generate an selinux audit for each + // non-permitted property access in this function. + cnode->Open(false, nullptr); + } + return cnode->pa(); +} + +void ContextsSplit::ForEach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) { + ListForEach(contexts_, [propfn, cookie](ContextListNode* l) { + if (l->CheckAccessAndOpen()) { + l->pa()->foreach (propfn, cookie); + } + }); +} + +void ContextsSplit::ResetAccess() { + ListForEach(contexts_, [](ContextListNode* l) { l->ResetAccess(); }); +} + +void ContextsSplit::FreeAndUnmap() { + ListFree(&prefixes_); + ListFree(&contexts_); + prop_area::unmap_prop_area(&serial_prop_area_); +} diff --git a/native/jni/resetprop/libsystemproperties/include/async_safe/log.h b/native/jni/resetprop/libsystemproperties/include/async_safe/log.h new file mode 100644 index 000000000..96c48f234 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/async_safe/log.h @@ -0,0 +1,4 @@ +#pragma once + +#define async_safe_format_buffer snprintf +#define async_safe_format_log(...) /* NOP */ diff --git a/native/jni/resetprop/libsystemproperties/include/hacks.h b/native/jni/resetprop/libsystemproperties/include/hacks.h new file mode 100644 index 000000000..f663ae062 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/hacks.h @@ -0,0 +1,14 @@ +#pragma once + +#include + +#ifndef PR_SET_VMA +#define PR_SET_VMA 0x53564d41 +#endif +#ifndef PR_SET_VMA_ANON_NAME +#define PR_SET_VMA_ANON_NAME 0 +#endif +#define getline __getline +#define fsetxattr __fsetxattr +extern "C" ssize_t __getline(char **, size_t *, FILE *); +extern "C" int __fsetxattr(int, const char *, const void *, size_t, int); diff --git a/native/jni/resetprop/libsystemproperties/include/private/ErrnoRestorer.h b/native/jni/resetprop/libsystemproperties/include/private/ErrnoRestorer.h new file mode 100644 index 000000000..f4673936a --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/private/ErrnoRestorer.h @@ -0,0 +1,43 @@ +/* + * Copyright (C) 2013 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef ERRNO_RESTORER_H +#define ERRNO_RESTORER_H + +#include + +#include "bionic_macros.h" + +class ErrnoRestorer { + public: + explicit ErrnoRestorer() : saved_errno_(errno) { + } + + ~ErrnoRestorer() { + errno = saved_errno_; + } + + void override(int new_errno) { + saved_errno_ = new_errno; + } + + private: + int saved_errno_; + + DISALLOW_COPY_AND_ASSIGN(ErrnoRestorer); +}; + +#endif // ERRNO_RESTORER_H diff --git a/native/jni/resetprop/private/bionic_futex.h b/native/jni/resetprop/libsystemproperties/include/private/bionic_futex.h similarity index 74% rename from native/jni/resetprop/private/bionic_futex.h rename to native/jni/resetprop/libsystemproperties/include/private/bionic_futex.h index 3c7d81d19..b34069044 100644 --- a/native/jni/resetprop/private/bionic_futex.h +++ b/native/jni/resetprop/libsystemproperties/include/private/bionic_futex.h @@ -29,20 +29,17 @@ #define _BIONIC_FUTEX_H #include -#include "futex.h" +#include #include #include #include #include #include -__BEGIN_DECLS - struct timespec; -static inline int __futex(volatile void* ftx, int op, int value, - const struct timespec* timeout, - int bitset) { +static inline __always_inline int __futex(volatile void* ftx, int op, int value, + const timespec* timeout, int bitset) { // Our generated syscall assembler sets errno, but our callers (pthread functions) don't want to. int saved_errno = errno; int result = syscall(__NR_futex, ftx, op, value, timeout, NULL, bitset); @@ -54,24 +51,30 @@ static inline int __futex(volatile void* ftx, int op, int value, } static inline int __futex_wake(volatile void* ftx, int count) { - return __futex(ftx, FUTEX_WAKE, count, NULL, 0); + return __futex(ftx, FUTEX_WAKE, count, nullptr, 0); } static inline int __futex_wake_ex(volatile void* ftx, bool shared, int count) { - return __futex(ftx, shared ? FUTEX_WAKE : FUTEX_WAKE_PRIVATE, count, NULL, 0); + return __futex(ftx, shared ? FUTEX_WAKE : FUTEX_WAKE_PRIVATE, count, nullptr, 0); } -static inline int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) { +static inline int __futex_wait(volatile void* ftx, int value, const timespec* timeout) { return __futex(ftx, FUTEX_WAIT, value, timeout, 0); } -static inline int __futex_wait_ex(volatile void* ftx, bool shared, int value, - bool use_realtime_clock, const struct timespec* abs_timeout) { - return __futex(ftx, (shared ? FUTEX_WAIT_BITSET : FUTEX_WAIT_BITSET_PRIVATE) | - (use_realtime_clock ? FUTEX_CLOCK_REALTIME : 0), value, abs_timeout, +static inline int __futex_wait_ex(volatile void* ftx, bool shared, int value) { + return __futex(ftx, (shared ? FUTEX_WAIT_BITSET : FUTEX_WAIT_BITSET_PRIVATE), value, nullptr, FUTEX_BITSET_MATCH_ANY); } -__END_DECLS +__LIBC_HIDDEN__ int __futex_wait_ex(volatile void* ftx, bool shared, int value, + bool use_realtime_clock, const timespec* abs_timeout); + +static inline int __futex_pi_unlock(volatile void* ftx, bool shared) { + return __futex(ftx, shared ? FUTEX_UNLOCK_PI : FUTEX_UNLOCK_PI_PRIVATE, 0, nullptr, 0); +} + +__LIBC_HIDDEN__ int __futex_pi_lock_ex(volatile void* ftx, bool shared, bool use_realtime_clock, + const timespec* abs_timeout); #endif /* _BIONIC_FUTEX_H */ diff --git a/native/jni/resetprop/private/bionic_lock.h b/native/jni/resetprop/libsystemproperties/include/private/bionic_lock.h similarity index 88% rename from native/jni/resetprop/private/bionic_lock.h rename to native/jni/resetprop/libsystemproperties/include/private/bionic_lock.h index 828366f47..54168d3ad 100644 --- a/native/jni/resetprop/private/bionic_lock.h +++ b/native/jni/resetprop/libsystemproperties/include/private/bionic_lock.h @@ -28,9 +28,9 @@ #ifndef _BIONIC_LOCK_H #define _BIONIC_LOCK_H -#include "stdatomic.h" -#include "bionic_futex.h" -#include "bionic_macros.h" +#include +#include "private/bionic_futex.h" +#include "private/bionic_macros.h" // Lock is used in places like pthread_rwlock_t, which can be initialized without calling // an initialization function. So make sure Lock can be initialized by setting its memory to 0. @@ -64,7 +64,7 @@ class Lock { } while (atomic_exchange_explicit(&state, LockedWithWaiter, memory_order_acquire) != Unlocked) { // TODO: As the critical section is brief, it is a better choice to spin a few times befor sleeping. - __futex_wait_ex(&state, process_shared, LockedWithWaiter, false, nullptr); + __futex_wait_ex(&state, process_shared, LockedWithWaiter); } return; } @@ -76,4 +76,19 @@ class Lock { } }; +class LockGuard { + public: + LockGuard(Lock& lock) : lock_(lock) { + lock_.lock(); + } + ~LockGuard() { + lock_.unlock(); + } + + DISALLOW_COPY_AND_ASSIGN(LockGuard); + + private: + Lock& lock_; +}; + #endif // _BIONIC_LOCK_H diff --git a/native/jni/resetprop/libsystemproperties/include/private/bionic_macros.h b/native/jni/resetprop/libsystemproperties/include/private/bionic_macros.h new file mode 100644 index 000000000..0a36cdb18 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/private/bionic_macros.h @@ -0,0 +1,105 @@ +/* + * Copyright (C) 2010 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef _BIONIC_MACROS_H_ +#define _BIONIC_MACROS_H_ + +#include + +// Frameworks OpenGL code currently leaks this header and allows +// collisions with other declarations, e.g., from libnativehelper. +// TODO: Remove once cleaned up. b/18334516 +#if !defined(DISALLOW_COPY_AND_ASSIGN) +// DISALLOW_COPY_AND_ASSIGN disallows the copy and operator= functions. +// It goes in the private: declarations in a class. +#define DISALLOW_COPY_AND_ASSIGN(TypeName) \ + TypeName(const TypeName&) = delete; \ + void operator=(const TypeName&) = delete +#endif // !defined(DISALLOW_COPY_AND_ASSIGN) + +// A macro to disallow all the implicit constructors, namely the +// default constructor, copy constructor and operator= functions. +// +// This should be used in the private: declarations for a class +// that wants to prevent anyone from instantiating it. This is +// especially useful for classes containing only static methods. +#define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \ + TypeName() = delete; \ + DISALLOW_COPY_AND_ASSIGN(TypeName) + +#define BIONIC_ROUND_UP_POWER_OF_2(value) \ + ((sizeof(value) == 8) \ + ? (1UL << (64 - __builtin_clzl(static_cast(value)))) \ + : (1UL << (32 - __builtin_clz(static_cast(value))))) + +static constexpr uintptr_t align_down(uintptr_t p, size_t align) { + return p & ~(align - 1); +} + +static constexpr uintptr_t align_up(uintptr_t p, size_t align) { + return (p + align - 1) & ~(align - 1); +} + +template +static inline T* align_down(T* p, size_t align) { + return reinterpret_cast(align_down(reinterpret_cast(p), align)); +} + +template +static inline T* align_up(T* p, size_t align) { + return reinterpret_cast(align_up(reinterpret_cast(p), align)); +} + +#if defined(__arm__) +// Do not emit anything for arm, clang does not allow emiting an arm unwind +// directive. +// #define BIONIC_STOP_UNWIND asm volatile(".cantunwind") +#define BIONIC_STOP_UNWIND +#elif defined(__aarch64__) +#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined x30") +#elif defined(__i386__) +#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%eip") +#elif defined(__x86_64__) +#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%rip") +#elif defined (__mips__) +#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined $ra") +#endif + +// The arraysize(arr) macro returns the # of elements in an array arr. +// The expression is a compile-time constant, and therefore can be +// used in defining new arrays, for example. If you use arraysize on +// a pointer by mistake, you will get a compile-time error. +// +// One caveat is that arraysize() doesn't accept any array of an +// anonymous type or a type defined inside a function. +// +// This template function declaration is used in defining arraysize. +// Note that the function doesn't need an implementation, as we only +// use its type. +template +char (&ArraySizeHelper(T (&array)[N]))[N]; // NOLINT(readability/casting) + +#define arraysize(array) (sizeof(ArraySizeHelper(array))) + +// Used to inform clang's -Wimplicit-fallthrough that a fallthrough is intended. There's no way to +// silence (or enable, apparently) -Wimplicit-fallthrough in C yet. +#ifdef __cplusplus +#define __BIONIC_FALLTHROUGH [[clang::fallthrough]] +#else +#define __BIONIC_FALLTHROUGH +#endif + +#endif // _BIONIC_MACROS_H_ diff --git a/native/jni/resetprop/libsystemproperties/include/property_info_parser/property_info_parser.h b/native/jni/resetprop/libsystemproperties/include/property_info_parser/property_info_parser.h new file mode 100644 index 000000000..054802197 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/property_info_parser/property_info_parser.h @@ -0,0 +1,224 @@ +// +// Copyright (C) 2017 The Android Open Source Project +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// + +#ifndef PROPERTY_INFO_PARSER_H +#define PROPERTY_INFO_PARSER_H + +#include +#include + +namespace android { +namespace properties { + +// The below structs intentionally do not end with char name[0] or other tricks to allocate +// with a dynamic size, such that they can be added onto in the future without breaking +// backwards compatibility. +struct PropertyEntry { + uint32_t name_offset; + uint32_t namelen; + + // This is the context match for this node_; ~0u if it doesn't correspond to any. + uint32_t context_index; + // This is the type for this node_; ~0u if it doesn't correspond to any. + uint32_t type_index; +}; + +struct TrieNodeInternal { + // This points to a property entry struct, which includes the name for this node + uint32_t property_entry; + + // Children are a sorted list of child nodes_; binary search them. + uint32_t num_child_nodes; + uint32_t child_nodes; + + // Prefixes are terminating prefix matches at this node, sorted longest to smallest + // Take the first match sequentially found with StartsWith(). + uint32_t num_prefixes; + uint32_t prefix_entries; + + // Exact matches are a sorted list of exact matches at this node_; binary search them. + uint32_t num_exact_matches; + uint32_t exact_match_entries; +}; + +struct PropertyInfoAreaHeader { + // The current version of this data as created by property service. + uint32_t current_version; + // The lowest version of libc that can properly parse this data. + uint32_t minimum_supported_version; + uint32_t size; + uint32_t contexts_offset; + uint32_t types_offset; + uint32_t root_offset; +}; + +class SerializedData { + public: + uint32_t size() const { + return reinterpret_cast(data_base_)->size; + } + + const char* c_string(uint32_t offset) const { + if (offset != 0 && offset > size()) return nullptr; + return static_cast(data_base_ + offset); + } + + const uint32_t* uint32_array(uint32_t offset) const { + if (offset != 0 && offset > size()) return nullptr; + return reinterpret_cast(data_base_ + offset); + } + + uint32_t uint32(uint32_t offset) const { + if (offset != 0 && offset > size()) return ~0u; + return *reinterpret_cast(data_base_ + offset); + } + + const char* data_base() const { return data_base_; } + + private: + const char data_base_[0]; +}; + +class TrieNode { + public: + TrieNode() : serialized_data_(nullptr), trie_node_base_(nullptr) {} + TrieNode(const SerializedData* data_base, const TrieNodeInternal* trie_node_base) + : serialized_data_(data_base), trie_node_base_(trie_node_base) {} + + const char* name() const { + return serialized_data_->c_string(node_property_entry()->name_offset); + } + + uint32_t context_index() const { return node_property_entry()->context_index; } + uint32_t type_index() const { return node_property_entry()->type_index; } + + uint32_t num_child_nodes() const { return trie_node_base_->num_child_nodes; } + TrieNode child_node(int n) const { + uint32_t child_node_offset = serialized_data_->uint32_array(trie_node_base_->child_nodes)[n]; + const TrieNodeInternal* trie_node_base = + reinterpret_cast(serialized_data_->data_base() + child_node_offset); + return TrieNode(serialized_data_, trie_node_base); + } + + bool FindChildForString(const char* input, uint32_t namelen, TrieNode* child) const; + + uint32_t num_prefixes() const { return trie_node_base_->num_prefixes; } + const PropertyEntry* prefix(int n) const { + uint32_t prefix_entry_offset = + serialized_data_->uint32_array(trie_node_base_->prefix_entries)[n]; + return reinterpret_cast(serialized_data_->data_base() + + prefix_entry_offset); + } + + uint32_t num_exact_matches() const { return trie_node_base_->num_exact_matches; } + const PropertyEntry* exact_match(int n) const { + uint32_t exact_match_entry_offset = + serialized_data_->uint32_array(trie_node_base_->exact_match_entries)[n]; + return reinterpret_cast(serialized_data_->data_base() + + exact_match_entry_offset); + } + + private: + const PropertyEntry* node_property_entry() const { + return reinterpret_cast(serialized_data_->data_base() + + trie_node_base_->property_entry); + } + + const SerializedData* serialized_data_; + const TrieNodeInternal* trie_node_base_; +}; + +class PropertyInfoArea : private SerializedData { + public: + void GetPropertyInfoIndexes(const char* name, uint32_t* context_index, uint32_t* type_index) const; + void GetPropertyInfo(const char* property, const char** context, const char** type) const; + + int FindContextIndex(const char* context) const; + int FindTypeIndex(const char* type) const; + + const char* context(uint32_t index) const { + uint32_t context_array_size_offset = contexts_offset(); + const uint32_t* context_array = uint32_array(context_array_size_offset + sizeof(uint32_t)); + return data_base() + context_array[index]; + } + + const char* type(uint32_t index) const { + uint32_t type_array_size_offset = types_offset(); + const uint32_t* type_array = uint32_array(type_array_size_offset + sizeof(uint32_t)); + return data_base() + type_array[index]; + } + + uint32_t current_version() const { return header()->current_version; } + uint32_t minimum_supported_version() const { return header()->minimum_supported_version; } + + uint32_t size() const { return SerializedData::size(); } + + uint32_t num_contexts() const { return uint32_array(contexts_offset())[0]; } + uint32_t num_types() const { return uint32_array(types_offset())[0]; } + + TrieNode root_node() const { return trie(header()->root_offset); } + + private: + void CheckPrefixMatch(const char* remaining_name, const TrieNode& trie_node, + uint32_t* context_index, uint32_t* type_index) const; + + const PropertyInfoAreaHeader* header() const { + return reinterpret_cast(data_base()); + } + uint32_t contexts_offset() const { return header()->contexts_offset; } + uint32_t contexts_array_offset() const { return contexts_offset() + sizeof(uint32_t); } + uint32_t types_offset() const { return header()->types_offset; } + uint32_t types_array_offset() const { return types_offset() + sizeof(uint32_t); } + + TrieNode trie(uint32_t offset) const { + if (offset != 0 && offset > size()) return TrieNode(); + const TrieNodeInternal* trie_node_base = + reinterpret_cast(data_base() + offset); + return TrieNode(this, trie_node_base); + } +}; + +// This is essentially a smart pointer for read only mmap region for property contexts. +class PropertyInfoAreaFile { + public: + PropertyInfoAreaFile() : mmap_base_(nullptr), mmap_size_(0) {} + ~PropertyInfoAreaFile() { Reset(); } + + PropertyInfoAreaFile(const PropertyInfoAreaFile&) = delete; + void operator=(const PropertyInfoAreaFile&) = delete; + PropertyInfoAreaFile(PropertyInfoAreaFile&&) = default; + PropertyInfoAreaFile& operator=(PropertyInfoAreaFile&&) = default; + + bool LoadDefaultPath(); + bool LoadPath(const char* filename); + + const PropertyInfoArea* operator->() const { + return reinterpret_cast(mmap_base_); + } + + explicit operator bool() const { return mmap_base_ != nullptr; } + + void Reset(); + + private: + void* mmap_base_; + size_t mmap_size_; +}; + +} // namespace properties +} // namespace android + +#endif diff --git a/native/jni/resetprop/libsystemproperties/include/system_properties/context_node.h b/native/jni/resetprop/libsystemproperties/include/system_properties/context_node.h new file mode 100644 index 000000000..35d0e92c2 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/system_properties/context_node.h @@ -0,0 +1,67 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#pragma once + +#include "private/bionic_lock.h" + +#include "prop_area.h" + +class ContextNode { + public: + ContextNode(const char* context, const char* filename) + : context_(context), pa_(nullptr), no_access_(false), filename_(filename) { + lock_.init(false); + } + ~ContextNode() { + Unmap(); + } + + DISALLOW_COPY_AND_ASSIGN(ContextNode); + + bool Open(bool access_rw, bool* fsetxattr_failed); + bool CheckAccessAndOpen(); + void ResetAccess(); + void Unmap(); + + const char* context() const { + return context_; + } + prop_area* pa() { + return pa_; + } + + private: + bool CheckAccess(); + + Lock lock_; + const char* context_; + prop_area* pa_; + bool no_access_; + const char* filename_; +}; diff --git a/native/jni/resetprop/libsystemproperties/include/system_properties/contexts.h b/native/jni/resetprop/libsystemproperties/include/system_properties/contexts.h new file mode 100644 index 000000000..670f80828 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/system_properties/contexts.h @@ -0,0 +1,45 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#pragma once + +#include "prop_area.h" +#include "prop_info.h" + +class Contexts { + public: + virtual ~Contexts() { + } + + virtual bool Initialize(bool writable, const char* filename, bool* fsetxattr_failed) = 0; + virtual prop_area* GetPropAreaForName(const char* name) = 0; + virtual prop_area* GetSerialPropArea() = 0; + virtual void ForEach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) = 0; + virtual void ResetAccess() = 0; + virtual void FreeAndUnmap() = 0; +}; diff --git a/native/jni/resetprop/libsystemproperties/include/system_properties/contexts_pre_split.h b/native/jni/resetprop/libsystemproperties/include/system_properties/contexts_pre_split.h new file mode 100644 index 000000000..6e695e9a1 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/system_properties/contexts_pre_split.h @@ -0,0 +1,69 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#pragma once + +#include "contexts.h" +#include "prop_area.h" +#include "prop_info.h" + +class ContextsPreSplit : public Contexts { + public: + virtual ~ContextsPreSplit() override { + } + + // We'll never initialize this legacy option as writable, so don't even check the arg. + virtual bool Initialize(bool, const char* filename, bool*) override { + pre_split_prop_area_ = prop_area::map_prop_area(filename); + return pre_split_prop_area_ != nullptr; + } + + virtual prop_area* GetPropAreaForName(const char*) override { + return pre_split_prop_area_; + } + + virtual prop_area* GetSerialPropArea() override { + return pre_split_prop_area_; + } + + virtual void ForEach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) override { + pre_split_prop_area_->foreach (propfn, cookie); + } + + // This is a no-op for pre-split properties as there is only one property file and it is + // accessible by all domains + virtual void ResetAccess() override { + } + + virtual void FreeAndUnmap() override { + prop_area::unmap_prop_area(&pre_split_prop_area_); + } + + private: + prop_area* pre_split_prop_area_ = nullptr; +}; diff --git a/native/jni/resetprop/libsystemproperties/include/system_properties/contexts_serialized.h b/native/jni/resetprop/libsystemproperties/include/system_properties/contexts_serialized.h new file mode 100644 index 000000000..93d6ac1bc --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/system_properties/contexts_serialized.h @@ -0,0 +1,61 @@ +/* + * Copyright (C) 2017 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#pragma once + +#include + +#include "context_node.h" +#include "contexts.h" + +class ContextsSerialized : public Contexts { + public: + virtual ~ContextsSerialized() override { + } + + virtual bool Initialize(bool writable, const char* filename, bool* fsetxattr_failed) override; + virtual prop_area* GetPropAreaForName(const char* name) override; + virtual prop_area* GetSerialPropArea() override { + return serial_prop_area_; + } + virtual void ForEach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) override; + virtual void ResetAccess() override; + virtual void FreeAndUnmap() override; + + private: + bool InitializeContextNodes(); + bool InitializeProperties(); + bool MapSerialPropertyArea(bool access_rw, bool* fsetxattr_failed); + + const char* filename_; + android::properties::PropertyInfoAreaFile property_info_area_file_; + ContextNode* context_nodes_ = nullptr; + size_t num_context_nodes_ = 0; + size_t context_nodes_mmap_size_ = 0; + prop_area* serial_prop_area_ = nullptr; +}; diff --git a/native/jni/resetprop/libsystemproperties/include/system_properties/contexts_split.h b/native/jni/resetprop/libsystemproperties/include/system_properties/contexts_split.h new file mode 100644 index 000000000..acb18e3de --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/system_properties/contexts_split.h @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#pragma once + +#include "contexts.h" + +struct PrefixNode; +class ContextListNode; + +class ContextsSplit : public Contexts { + public: + virtual ~ContextsSplit() override { + } + + virtual bool Initialize(bool writable, const char* filename, bool* fsetxattr_failed) override; + virtual prop_area* GetPropAreaForName(const char* name) override; + virtual prop_area* GetSerialPropArea() override { + return serial_prop_area_; + } + virtual void ForEach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) override; + virtual void ResetAccess() override; + virtual void FreeAndUnmap() override; + + private: + bool MapSerialPropertyArea(bool access_rw, bool* fsetxattr_failed); + bool InitializePropertiesFromFile(const char* filename); + bool InitializeProperties(); + + PrefixNode* prefixes_ = nullptr; + ContextListNode* contexts_ = nullptr; + prop_area* serial_prop_area_ = nullptr; + const char* filename_ = nullptr; +}; diff --git a/native/jni/resetprop/libsystemproperties/include/system_properties/prop_area.h b/native/jni/resetprop/libsystemproperties/include/system_properties/prop_area.h new file mode 100644 index 000000000..2c253370e --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/system_properties/prop_area.h @@ -0,0 +1,162 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#pragma once + +#include +#include +#include +#include + +#include "private/bionic_macros.h" + +#include "prop_info.h" + +// Properties are stored in a hybrid trie/binary tree structure. +// Each property's name is delimited at '.' characters, and the tokens are put +// into a trie structure. Siblings at each level of the trie are stored in a +// binary tree. For instance, "ro.secure"="1" could be stored as follows: +// +// +-----+ children +----+ children +--------+ +// | |-------------->| ro |-------------->| secure | +// +-----+ +----+ +--------+ +// / \ / | +// left / \ right left / | prop +===========+ +// v v v +-------->| ro.secure | +// +-----+ +-----+ +-----+ +-----------+ +// | net | | sys | | com | | 1 | +// +-----+ +-----+ +-----+ +===========+ + +// Represents a node in the trie. +struct prop_bt { + uint32_t namelen; + + // The property trie is updated only by the init process (single threaded) which provides + // property service. And it can be read by multiple threads at the same time. + // As the property trie is not protected by locks, we use atomic_uint_least32_t types for the + // left, right, children "pointers" in the trie node. To make sure readers who see the + // change of "pointers" can also notice the change of prop_bt structure contents pointed by + // the "pointers", we always use release-consume ordering pair when accessing these "pointers". + + // prop "points" to prop_info structure if there is a propery associated with the trie node. + // Its situation is similar to the left, right, children "pointers". So we use + // atomic_uint_least32_t and release-consume ordering to protect it as well. + + // We should also avoid rereading these fields redundantly, since not + // all processor implementations ensure that multiple loads from the + // same field are carried out in the right order. + atomic_uint_least32_t prop; + + atomic_uint_least32_t left; + atomic_uint_least32_t right; + + atomic_uint_least32_t children; + + char name[0]; + + prop_bt(const char* name, const uint32_t name_length) { + this->namelen = name_length; + memcpy(this->name, name, name_length); + this->name[name_length] = '\0'; + } + + private: + DISALLOW_COPY_AND_ASSIGN(prop_bt); +}; + +class prop_area { + public: + static prop_area* map_prop_area_rw(const char* filename, const char* context, + bool* fsetxattr_failed); + static prop_area* map_prop_area(const char* filename); + static void unmap_prop_area(prop_area** pa) { + if (*pa) { + munmap(*pa, pa_size_); + *pa = nullptr; + } + } + + prop_area(const uint32_t magic, const uint32_t version) : magic_(magic), version_(version) { + atomic_init(&serial_, 0u); + memset(reserved_, 0, sizeof(reserved_)); + // Allocate enough space for the root node. + bytes_used_ = sizeof(prop_bt); + } + + const prop_info* find(const char* name); + bool add(const char* name, unsigned int namelen, const char* value, unsigned int valuelen); + + bool foreach (void (*propfn)(const prop_info* pi, void* cookie), void* cookie); + + atomic_uint_least32_t* serial() { + return &serial_; + } + uint32_t magic() const { + return magic_; + } + uint32_t version() const { + return version_; + } + + private: + static prop_area* map_fd_ro(const int fd); + + void* allocate_obj(const size_t size, uint_least32_t* const off); + prop_bt* new_prop_bt(const char* name, uint32_t namelen, uint_least32_t* const off); + prop_info* new_prop_info(const char* name, uint32_t namelen, const char* value, uint32_t valuelen, + uint_least32_t* const off); + void* to_prop_obj(uint_least32_t off); + prop_bt* to_prop_bt(atomic_uint_least32_t* off_p); + prop_info* to_prop_info(atomic_uint_least32_t* off_p); + + prop_bt* root_node(); + + prop_bt* find_prop_bt(prop_bt* const bt, const char* name, uint32_t namelen, bool alloc_if_needed); + + const prop_info* find_property(prop_bt* const trie, const char* name, uint32_t namelen, + const char* value, uint32_t valuelen, bool alloc_if_needed); + + bool foreach_property(prop_bt* const trie, void (*propfn)(const prop_info* pi, void* cookie), + void* cookie); + + // The original design doesn't include pa_size or pa_data_size in the prop_area struct itself. + // Since we'll need to be backwards compatible with that design, we don't gain much by adding it + // now, especially since we don't have any plans to make different property areas different sizes, + // and thus we share these two variables among all instances. + static size_t pa_size_; + static size_t pa_data_size_; + + uint32_t bytes_used_; + atomic_uint_least32_t serial_; + uint32_t magic_; + uint32_t version_; + uint32_t reserved_[28]; + char data_[0]; + + DISALLOW_COPY_AND_ASSIGN(prop_area); +}; diff --git a/native/jni/resetprop/libsystemproperties/include/system_properties/prop_info.h b/native/jni/resetprop/libsystemproperties/include/system_properties/prop_info.h new file mode 100644 index 000000000..6e03e7d12 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/system_properties/prop_info.h @@ -0,0 +1,90 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#pragma once + +#include +#include +#include + +#include "private/bionic_macros.h" +#include "hacks.h" + +// The C11 standard doesn't allow atomic loads from const fields, +// though C++11 does. Fudge it until standards get straightened out. +static inline uint_least32_t load_const_atomic(const atomic_uint_least32_t* s, memory_order mo) { + atomic_uint_least32_t* non_const_s = const_cast(s); + return atomic_load_explicit(non_const_s, mo); +} + +struct prop_info { + // Read only properties will not set anything but the bottom most bit of serial and the top byte. + // We borrow the 2nd from the top byte for extra flags, and use the bottom most bit of that for + // our first user, kLongFlag. + constexpr static uint32_t kLongFlag = 1 << 16; + + // The error message fits in part of a union with the previous 92 char property value so there + // must be room left over after the error message for the offset to the new longer property value + // and future expansion fields if needed. Note that this value cannot ever increase. The offset + // to the new longer property value appears immediately after it, so an increase of this size will + // break compatibility. + constexpr static size_t kLongLegacyErrorBufferSize = 56; + + public: + atomic_uint_least32_t serial; + // we need to keep this buffer around because the property + // value can be modified whereas name is constant. + union { + char value[PROP_VALUE_MAX]; + struct { + char error_message[kLongLegacyErrorBufferSize]; + uint32_t offset; + } long_property; + }; + char name[0]; + + bool is_long() const { + return (load_const_atomic(&serial, memory_order_relaxed) & kLongFlag) != 0; + } + + const char* long_value() const { + // We can't store pointers here since this is shared memory that will have different absolute + // pointers in different processes. We don't have data_ from prop_area, but since we know + // `this` is data_ + some offset and long_value is data_ + some other offset, we calculate the + // offset from `this` to long_value and store it as long_property.offset. + return reinterpret_cast(this) + long_property.offset; + } + + prop_info(const char* name, uint32_t namelen, const char* value, uint32_t valuelen); + prop_info(const char* name, uint32_t namelen, uint32_t long_offset); + + private: + DISALLOW_IMPLICIT_CONSTRUCTORS(prop_info); +}; + +static_assert(sizeof(prop_info) == 96, "sizeof struct prop_info must be 96 bytes"); diff --git a/native/jni/resetprop/libsystemproperties/include/system_properties/system_properties.h b/native/jni/resetprop/libsystemproperties/include/system_properties/system_properties.h new file mode 100644 index 000000000..52ffcafd0 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/include/system_properties/system_properties.h @@ -0,0 +1,89 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#pragma once + +#include +#include +#include + +#include "contexts.h" +#include "contexts_pre_split.h" +#include "contexts_serialized.h" +#include "contexts_split.h" + +constexpr int PROP_FILENAME_MAX = 1024; + +class SystemProperties { + public: + friend struct LocalPropertyTestState; + friend class SystemPropertiesTest; + // Note that system properties are initialized before libc calls static initializers, so + // doing any initialization in this constructor is an error. Even a Constructor that zero + // initializes this class will clobber the previous property initialization. + // We rely on the static SystemProperties in libc to be placed in .bss and zero initialized. + SystemProperties() = default; + // Special constructor for testing that also zero initializes the important members. + explicit SystemProperties(bool initialized) : initialized_(initialized) { + } + + DISALLOW_COPY_AND_ASSIGN(SystemProperties); + + bool Init(const char* filename); + bool AreaInit(const char* filename, bool* fsetxattr_failed); + uint32_t AreaSerial(); + const prop_info* Find(const char* name); + int Read(const prop_info* pi, char* name, char* value); + void ReadCallback(const prop_info* pi, + void (*callback)(void* cookie, const char* name, const char* value, + uint32_t serial), + void* cookie); + int Get(const char* name, char* value); + int Update(prop_info* pi, const char* value, unsigned int len); + int Add(const char* name, unsigned int namelen, const char* value, unsigned int valuelen); + uint32_t Serial(const prop_info* pi); + uint32_t WaitAny(uint32_t old_serial); + bool Wait(const prop_info* pi, uint32_t old_serial, uint32_t* new_serial_ptr, + const timespec* relative_timeout); + const prop_info* FindNth(unsigned n); + int Foreach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie); + + private: + // We don't want to use new or malloc in properties (b/31659220), and we don't want to waste a + // full page by using mmap(), so we set aside enough space to create any context of the three + // contexts. + static constexpr size_t kMaxContextsAlign = + MAX(alignof(ContextsSerialized), MAX(alignof(ContextsSplit), alignof(ContextsPreSplit))); + static constexpr size_t kMaxContextsSize = + MAX(sizeof(ContextsSerialized), MAX(sizeof(ContextsSplit), sizeof(ContextsPreSplit))); + alignas(kMaxContextsAlign) char contexts_data_[kMaxContextsSize]; + Contexts* contexts_; + + bool initialized_; + char property_filename_[PROP_FILENAME_MAX]; +}; diff --git a/native/jni/resetprop/libsystemproperties/prop_area.cpp b/native/jni/resetprop/libsystemproperties/prop_area.cpp new file mode 100644 index 000000000..42bee9f3e --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/prop_area.cpp @@ -0,0 +1,373 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "system_properties/prop_area.h" + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include + +constexpr size_t PA_SIZE = 128 * 1024; +constexpr uint32_t PROP_AREA_MAGIC = 0x504f5250; +constexpr uint32_t PROP_AREA_VERSION = 0xfc6ed0ab; + +size_t prop_area::pa_size_ = 0; +size_t prop_area::pa_data_size_ = 0; + +prop_area* prop_area::map_prop_area_rw(const char* filename, const char* context, + bool* fsetxattr_failed) { + /* dev is a tmpfs that we can use to carve a shared workspace + * out of, so let's do that... + */ + const int fd = open(filename, O_RDWR | O_CREAT | O_NOFOLLOW | O_CLOEXEC | O_EXCL, 0444); + + if (fd < 0) { + if (errno == EACCES) { + /* for consistency with the case where the process has already + * mapped the page in and segfaults when trying to write to it + */ + abort(); + } + return nullptr; + } + + if (context) { + if (fsetxattr(fd, XATTR_NAME_SELINUX, context, strlen(context) + 1, 0) != 0) { + async_safe_format_log(ANDROID_LOG_ERROR, "libc", + "fsetxattr failed to set context (%s) for \"%s\"", context, filename); + /* + * fsetxattr() will fail during system properties tests due to selinux policy. + * We do not want to create a custom policy for the tester, so we will continue in + * this function but set a flag that an error has occurred. + * Init, which is the only daemon that should ever call this function will abort + * when this error occurs. + * Otherwise, the tester will ignore it and continue, albeit without any selinux + * property separation. + */ + if (fsetxattr_failed) { + *fsetxattr_failed = true; + } + } + } + + if (ftruncate(fd, PA_SIZE) < 0) { + close(fd); + return nullptr; + } + + pa_size_ = PA_SIZE; + pa_data_size_ = pa_size_ - sizeof(prop_area); + + void* const memory_area = mmap(nullptr, pa_size_, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + if (memory_area == MAP_FAILED) { + close(fd); + return nullptr; + } + + prop_area* pa = new (memory_area) prop_area(PROP_AREA_MAGIC, PROP_AREA_VERSION); + + close(fd); + return pa; +} + +prop_area* prop_area::map_fd_ro(const int fd) { + struct stat fd_stat; + if (fstat(fd, &fd_stat) < 0) { + return nullptr; + } + + if ((fd_stat.st_uid != 0) || (fd_stat.st_gid != 0) || + ((fd_stat.st_mode & (S_IWGRP | S_IWOTH)) != 0) || + (fd_stat.st_size < static_cast(sizeof(prop_area)))) { + return nullptr; + } + + pa_size_ = fd_stat.st_size; + pa_data_size_ = pa_size_ - sizeof(prop_area); + + void* const map_result = mmap(nullptr, pa_size_, PROT_READ, MAP_SHARED, fd, 0); + if (map_result == MAP_FAILED) { + return nullptr; + } + + prop_area* pa = reinterpret_cast(map_result); + if ((pa->magic() != PROP_AREA_MAGIC) || (pa->version() != PROP_AREA_VERSION)) { + munmap(pa, pa_size_); + return nullptr; + } + + return pa; +} + +prop_area* prop_area::map_prop_area(const char* filename) { + int fd = open(filename, O_CLOEXEC | O_NOFOLLOW | O_RDONLY); + if (fd == -1) return nullptr; + + prop_area* map_result = map_fd_ro(fd); + close(fd); + + return map_result; +} + +void* prop_area::allocate_obj(const size_t size, uint_least32_t* const off) { + const size_t aligned = __BIONIC_ALIGN(size, sizeof(uint_least32_t)); + if (bytes_used_ + aligned > pa_data_size_) { + return nullptr; + } + + *off = bytes_used_; + bytes_used_ += aligned; + return data_ + *off; +} + +prop_bt* prop_area::new_prop_bt(const char* name, uint32_t namelen, uint_least32_t* const off) { + uint_least32_t new_offset; + void* const p = allocate_obj(sizeof(prop_bt) + namelen + 1, &new_offset); + if (p != nullptr) { + prop_bt* bt = new (p) prop_bt(name, namelen); + *off = new_offset; + return bt; + } + + return nullptr; +} + +prop_info* prop_area::new_prop_info(const char* name, uint32_t namelen, const char* value, + uint32_t valuelen, uint_least32_t* const off) { + uint_least32_t new_offset; + void* const p = allocate_obj(sizeof(prop_info) + namelen + 1, &new_offset); + if (p == nullptr) return nullptr; + + prop_info* info; + if (valuelen >= PROP_VALUE_MAX) { + uint32_t long_value_offset = 0; + char* long_location = reinterpret_cast(allocate_obj(valuelen + 1, &long_value_offset)); + if (!long_location) return nullptr; + + memcpy(long_location, value, valuelen); + long_location[valuelen] = '\0'; + + // Both new_offset and long_value_offset are offsets based off of data_, however prop_info + // does not know what data_ is, so we change this offset to be an offset from the prop_info + // pointer that contains it. + long_value_offset -= new_offset; + + info = new (p) prop_info(name, namelen, long_value_offset); + } else { + info = new (p) prop_info(name, namelen, value, valuelen); + } + *off = new_offset; + return info; +} + +void* prop_area::to_prop_obj(uint_least32_t off) { + if (off > pa_data_size_) return nullptr; + + return (data_ + off); +} + +inline prop_bt* prop_area::to_prop_bt(atomic_uint_least32_t* off_p) { + uint_least32_t off = atomic_load_explicit(off_p, memory_order_consume); + return reinterpret_cast(to_prop_obj(off)); +} + +inline prop_info* prop_area::to_prop_info(atomic_uint_least32_t* off_p) { + uint_least32_t off = atomic_load_explicit(off_p, memory_order_consume); + return reinterpret_cast(to_prop_obj(off)); +} + +inline prop_bt* prop_area::root_node() { + return reinterpret_cast(to_prop_obj(0)); +} + +static int cmp_prop_name(const char* one, uint32_t one_len, const char* two, uint32_t two_len) { + if (one_len < two_len) + return -1; + else if (one_len > two_len) + return 1; + else + return strncmp(one, two, one_len); +} + +prop_bt* prop_area::find_prop_bt(prop_bt* const bt, const char* name, uint32_t namelen, + bool alloc_if_needed) { + prop_bt* current = bt; + while (true) { + if (!current) { + return nullptr; + } + + const int ret = cmp_prop_name(name, namelen, current->name, current->namelen); + if (ret == 0) { + return current; + } + + if (ret < 0) { + uint_least32_t left_offset = atomic_load_explicit(¤t->left, memory_order_relaxed); + if (left_offset != 0) { + current = to_prop_bt(¤t->left); + } else { + if (!alloc_if_needed) { + return nullptr; + } + + uint_least32_t new_offset; + prop_bt* new_bt = new_prop_bt(name, namelen, &new_offset); + if (new_bt) { + atomic_store_explicit(¤t->left, new_offset, memory_order_release); + } + return new_bt; + } + } else { + uint_least32_t right_offset = atomic_load_explicit(¤t->right, memory_order_relaxed); + if (right_offset != 0) { + current = to_prop_bt(¤t->right); + } else { + if (!alloc_if_needed) { + return nullptr; + } + + uint_least32_t new_offset; + prop_bt* new_bt = new_prop_bt(name, namelen, &new_offset); + if (new_bt) { + atomic_store_explicit(¤t->right, new_offset, memory_order_release); + } + return new_bt; + } + } + } +} + +const prop_info* prop_area::find_property(prop_bt* const trie, const char* name, uint32_t namelen, + const char* value, uint32_t valuelen, + bool alloc_if_needed) { + if (!trie) return nullptr; + + const char* remaining_name = name; + prop_bt* current = trie; + while (true) { + const char* sep = strchr(remaining_name, '.'); + const bool want_subtree = (sep != nullptr); + const uint32_t substr_size = (want_subtree) ? sep - remaining_name : strlen(remaining_name); + + if (!substr_size) { + return nullptr; + } + + prop_bt* root = nullptr; + uint_least32_t children_offset = atomic_load_explicit(¤t->children, memory_order_relaxed); + if (children_offset != 0) { + root = to_prop_bt(¤t->children); + } else if (alloc_if_needed) { + uint_least32_t new_offset; + root = new_prop_bt(remaining_name, substr_size, &new_offset); + if (root) { + atomic_store_explicit(¤t->children, new_offset, memory_order_release); + } + } + + if (!root) { + return nullptr; + } + + current = find_prop_bt(root, remaining_name, substr_size, alloc_if_needed); + if (!current) { + return nullptr; + } + + if (!want_subtree) break; + + remaining_name = sep + 1; + } + + uint_least32_t prop_offset = atomic_load_explicit(¤t->prop, memory_order_relaxed); + if (prop_offset != 0) { + return to_prop_info(¤t->prop); + } else if (alloc_if_needed) { + uint_least32_t new_offset; + prop_info* new_info = new_prop_info(name, namelen, value, valuelen, &new_offset); + if (new_info) { + atomic_store_explicit(¤t->prop, new_offset, memory_order_release); + } + + return new_info; + } else { + return nullptr; + } +} + +bool prop_area::foreach_property(prop_bt* const trie, + void (*propfn)(const prop_info* pi, void* cookie), void* cookie) { + if (!trie) return false; + + uint_least32_t left_offset = atomic_load_explicit(&trie->left, memory_order_relaxed); + if (left_offset != 0) { + const int err = foreach_property(to_prop_bt(&trie->left), propfn, cookie); + if (err < 0) return false; + } + uint_least32_t prop_offset = atomic_load_explicit(&trie->prop, memory_order_relaxed); + if (prop_offset != 0) { + prop_info* info = to_prop_info(&trie->prop); + if (!info) return false; + propfn(info, cookie); + } + uint_least32_t children_offset = atomic_load_explicit(&trie->children, memory_order_relaxed); + if (children_offset != 0) { + const int err = foreach_property(to_prop_bt(&trie->children), propfn, cookie); + if (err < 0) return false; + } + uint_least32_t right_offset = atomic_load_explicit(&trie->right, memory_order_relaxed); + if (right_offset != 0) { + const int err = foreach_property(to_prop_bt(&trie->right), propfn, cookie); + if (err < 0) return false; + } + + return true; +} + +const prop_info* prop_area::find(const char* name) { + return find_property(root_node(), name, strlen(name), nullptr, 0, false); +} + +bool prop_area::add(const char* name, unsigned int namelen, const char* value, + unsigned int valuelen) { + return find_property(root_node(), name, namelen, value, valuelen, true); +} + +bool prop_area::foreach (void (*propfn)(const prop_info* pi, void* cookie), void* cookie) { + return foreach_property(root_node(), propfn, cookie); +} diff --git a/native/jni/resetprop/libsystemproperties/prop_info.cpp b/native/jni/resetprop/libsystemproperties/prop_info.cpp new file mode 100644 index 000000000..890d1cff3 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/prop_info.cpp @@ -0,0 +1,55 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "system_properties/prop_info.h" + +#include + +constexpr static const char kLongLegacyError[] = + "Must use __system_property_read_callback() to read"; +static_assert(sizeof(kLongLegacyError) < prop_info::kLongLegacyErrorBufferSize, + "Error message for long properties read by legacy libc must fit within 56 chars"); + +prop_info::prop_info(const char* name, uint32_t namelen, const char* value, uint32_t valuelen) { + memcpy(this->name, name, namelen); + this->name[namelen] = '\0'; + atomic_init(&this->serial, valuelen << 24); + memcpy(this->value, value, valuelen); + this->value[valuelen] = '\0'; +} + +prop_info::prop_info(const char* name, uint32_t namelen, uint32_t long_offset) { + memcpy(this->name, name, namelen); + this->name[namelen] = '\0'; + + auto error_value_len = sizeof(kLongLegacyError) - 1; + atomic_init(&this->serial, error_value_len << 24 | kLongFlag); + memcpy(this->long_property.error_message, kLongLegacyError, sizeof(kLongLegacyError)); + + this->long_property.offset = long_offset; +} diff --git a/native/jni/resetprop/libsystemproperties/property_info_parser.cpp b/native/jni/resetprop/libsystemproperties/property_info_parser.cpp new file mode 100644 index 000000000..489d81a67 --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/property_info_parser.cpp @@ -0,0 +1,246 @@ +// +// Copyright (C) 2017 The Android Open Source Project +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// + +#include "property_info_parser/property_info_parser.h" + +#include +#include +#include +#include +#include +#include + +namespace android { +namespace properties { + +namespace { + +// Binary search to find index of element in an array compared via f(search). +template +int Find(uint32_t array_length, F&& f) { + int bottom = 0; + int top = array_length - 1; + while (top >= bottom) { + int search = (top + bottom) / 2; + + auto cmp = f(search); + + if (cmp == 0) return search; + if (cmp < 0) bottom = search + 1; + if (cmp > 0) top = search - 1; + } + return -1; +} + +} // namespace + +// Binary search the list of contexts to find the index of a given context string. +// Only should be used for TrieSerializer to construct the Trie. +int PropertyInfoArea::FindContextIndex(const char* context) const { + return Find(num_contexts(), [this, context](auto array_offset) { + auto string_offset = uint32_array(contexts_array_offset())[array_offset]; + return strcmp(c_string(string_offset), context); + }); +} + +// Binary search the list of types to find the index of a given type string. +// Only should be used for TrieSerializer to construct the Trie. +int PropertyInfoArea::FindTypeIndex(const char* type) const { + return Find(num_types(), [this, type](auto array_offset) { + auto string_offset = uint32_array(types_array_offset())[array_offset]; + return strcmp(c_string(string_offset), type); + }); +} + +// Binary search the list of children nodes to find a TrieNode for a given property piece. +// Used to traverse the Trie in GetPropertyInfoIndexes(). +bool TrieNode::FindChildForString(const char* name, uint32_t namelen, TrieNode* child) const { + auto node_index = Find(trie_node_base_->num_child_nodes, [this, name, namelen](auto array_offset) { + const char* child_name = child_node(array_offset).name(); + int cmp = strncmp(child_name, name, namelen); + if (cmp == 0 && child_name[namelen] != '\0') { + // We use strncmp() since name isn't null terminated, but we don't want to match only a + // prefix of a child node's name, so we check here if we did only match a prefix and + // return 1, to indicate to the binary search to search earlier in the array for the real + // match. + return 1; + } + return cmp; + }); + + if (node_index == -1) { + return false; + } + *child = child_node(node_index); + return true; +} + +void PropertyInfoArea::CheckPrefixMatch(const char* remaining_name, const TrieNode& trie_node, + uint32_t* context_index, uint32_t* type_index) const { + const uint32_t remaining_name_size = strlen(remaining_name); + for (uint32_t i = 0; i < trie_node.num_prefixes(); ++i) { + auto prefix_len = trie_node.prefix(i)->namelen; + if (prefix_len > remaining_name_size) continue; + + if (!strncmp(c_string(trie_node.prefix(i)->name_offset), remaining_name, prefix_len)) { + if (trie_node.prefix(i)->context_index != ~0u) { + *context_index = trie_node.prefix(i)->context_index; + } + if (trie_node.prefix(i)->type_index != ~0u) { + *type_index = trie_node.prefix(i)->type_index; + } + return; + } + } +} + +void PropertyInfoArea::GetPropertyInfoIndexes(const char* name, uint32_t* context_index, + uint32_t* type_index) const { + uint32_t return_context_index = ~0u; + uint32_t return_type_index = ~0u; + const char* remaining_name = name; + auto trie_node = root_node(); + while (true) { + const char* sep = strchr(remaining_name, '.'); + + // Apply prefix match for prefix deliminated with '.' + if (trie_node.context_index() != ~0u) { + return_context_index = trie_node.context_index(); + } + if (trie_node.type_index() != ~0u) { + return_type_index = trie_node.type_index(); + } + + // Check prefixes at this node. This comes after the node check since these prefixes are by + // definition longer than the node itself. + CheckPrefixMatch(remaining_name, trie_node, &return_context_index, &return_type_index); + + if (sep == nullptr) { + break; + } + + const uint32_t substr_size = sep - remaining_name; + TrieNode child_node; + if (!trie_node.FindChildForString(remaining_name, substr_size, &child_node)) { + break; + } + + trie_node = child_node; + remaining_name = sep + 1; + } + + // We've made it to a leaf node, so check contents and return appropriately. + // Check exact matches + for (uint32_t i = 0; i < trie_node.num_exact_matches(); ++i) { + if (!strcmp(c_string(trie_node.exact_match(i)->name_offset), remaining_name)) { + if (context_index != nullptr) { + if (trie_node.exact_match(i)->context_index != ~0u) { + *context_index = trie_node.exact_match(i)->context_index; + } else { + *context_index = return_context_index; + } + } + if (type_index != nullptr) { + if (trie_node.exact_match(i)->type_index != ~0u) { + *type_index = trie_node.exact_match(i)->type_index; + } else { + *type_index = return_type_index; + } + } + return; + } + } + // Check prefix matches for prefixes not deliminated with '.' + CheckPrefixMatch(remaining_name, trie_node, &return_context_index, &return_type_index); + // Return previously found prefix match. + if (context_index != nullptr) *context_index = return_context_index; + if (type_index != nullptr) *type_index = return_type_index; + return; +} + +void PropertyInfoArea::GetPropertyInfo(const char* property, const char** context, + const char** type) const { + uint32_t context_index; + uint32_t type_index; + GetPropertyInfoIndexes(property, &context_index, &type_index); + if (context != nullptr) { + if (context_index == ~0u) { + *context = nullptr; + } else { + *context = this->context(context_index); + } + } + if (type != nullptr) { + if (type_index == ~0u) { + *type = nullptr; + } else { + *type = this->type(type_index); + } + } +} + +bool PropertyInfoAreaFile::LoadDefaultPath() { + return LoadPath("/dev/__properties__/property_info"); +} + +bool PropertyInfoAreaFile::LoadPath(const char* filename) { + int fd = open(filename, O_CLOEXEC | O_NOFOLLOW | O_RDONLY); + + struct stat fd_stat; + if (fstat(fd, &fd_stat) < 0) { + close(fd); + return false; + } + + if ((fd_stat.st_uid != 0) || (fd_stat.st_gid != 0) || + ((fd_stat.st_mode & (S_IWGRP | S_IWOTH)) != 0) || + (fd_stat.st_size < static_cast(sizeof(PropertyInfoArea)))) { + close(fd); + return false; + } + + auto mmap_size = fd_stat.st_size; + + void* map_result = mmap(nullptr, mmap_size, PROT_READ, MAP_SHARED, fd, 0); + if (map_result == MAP_FAILED) { + close(fd); + return false; + } + + auto property_info_area = reinterpret_cast(map_result); + if (property_info_area->minimum_supported_version() > 1 || + property_info_area->size() != mmap_size) { + munmap(map_result, mmap_size); + close(fd); + return false; + } + + close(fd); + mmap_base_ = map_result; + mmap_size_ = mmap_size; + return true; +} + +void PropertyInfoAreaFile::Reset() { + if (mmap_size_ > 0) { + munmap(mmap_base_, mmap_size_); + } + mmap_base_ = nullptr; + mmap_size_ = 0; +} + +} // namespace properties +} // namespace android diff --git a/native/jni/resetprop/libsystemproperties/system_properties.cpp b/native/jni/resetprop/libsystemproperties/system_properties.cpp new file mode 100644 index 000000000..d7c441b9b --- /dev/null +++ b/native/jni/resetprop/libsystemproperties/system_properties.cpp @@ -0,0 +1,370 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "system_properties/system_properties.h" + +#include +#include +#include +#include +#include +#include +#include + +#include + +#include + +#include "private/ErrnoRestorer.h" +#include "private/bionic_futex.h" + +#include "system_properties/context_node.h" +#include "system_properties/prop_area.h" +#include "system_properties/prop_info.h" + +#define SERIAL_DIRTY(serial) ((serial)&1) +#define SERIAL_VALUE_LEN(serial) ((serial) >> 24) + +static bool is_dir(const char* pathname) { + struct stat info; + if (stat(pathname, &info) == -1) { + return false; + } + return S_ISDIR(info.st_mode); +} + +bool SystemProperties::Init(const char* filename) { + // This is called from __libc_init_common, and should leave errno at 0 (http://b/37248982). + ErrnoRestorer errno_restorer; + + if (initialized_) { + contexts_->ResetAccess(); + return true; + } + + if (strlen(filename) >= PROP_FILENAME_MAX) { + return false; + } + strcpy(property_filename_, filename); + + if (is_dir(property_filename_)) { + if (access("/dev/__properties__/property_info", R_OK) == 0) { + contexts_ = new (contexts_data_) ContextsSerialized(); + if (!contexts_->Initialize(false, property_filename_, nullptr)) { + return false; + } + } else { + contexts_ = new (contexts_data_) ContextsSplit(); + if (!contexts_->Initialize(false, property_filename_, nullptr)) { + return false; + } + } + } else { + contexts_ = new (contexts_data_) ContextsPreSplit(); + if (!contexts_->Initialize(false, property_filename_, nullptr)) { + return false; + } + } + initialized_ = true; + return true; +} + +bool SystemProperties::AreaInit(const char* filename, bool* fsetxattr_failed) { + if (strlen(filename) >= PROP_FILENAME_MAX) { + return false; + } + strcpy(property_filename_, filename); + + contexts_ = new (contexts_data_) ContextsSerialized(); + if (!contexts_->Initialize(true, property_filename_, fsetxattr_failed)) { + return false; + } + initialized_ = true; + return true; +} + +uint32_t SystemProperties::AreaSerial() { + if (!initialized_) { + return -1; + } + + prop_area* pa = contexts_->GetSerialPropArea(); + if (!pa) { + return -1; + } + + // Make sure this read fulfilled before __system_property_serial + return atomic_load_explicit(pa->serial(), memory_order_acquire); +} + +const prop_info* SystemProperties::Find(const char* name) { + if (!initialized_) { + return nullptr; + } + + prop_area* pa = contexts_->GetPropAreaForName(name); + if (!pa) { + async_safe_format_log(ANDROID_LOG_ERROR, "libc", "Access denied finding property \"%s\"", name); + return nullptr; + } + + return pa->find(name); +} + +static bool is_read_only(const char* name) { + return strncmp(name, "ro.", 3) == 0; +} + +int SystemProperties::Read(const prop_info* pi, char* name, char* value) { + while (true) { + uint32_t serial = Serial(pi); // acquire semantics + size_t len = SERIAL_VALUE_LEN(serial); + memcpy(value, pi->value, len + 1); + // TODO: Fix the synchronization scheme here. + // There is no fully supported way to implement this kind + // of synchronization in C++11, since the memcpy races with + // updates to pi, and the data being accessed is not atomic. + // The following fence is unintuitive, but would be the + // correct one if memcpy used memory_order_relaxed atomic accesses. + // In practice it seems unlikely that the generated code would + // would be any different, so this should be OK. + atomic_thread_fence(memory_order_acquire); + if (serial == load_const_atomic(&(pi->serial), memory_order_relaxed)) { + if (name != nullptr) { + size_t namelen = strlcpy(name, pi->name, PROP_NAME_MAX); + if (namelen >= PROP_NAME_MAX) { + async_safe_format_log(ANDROID_LOG_ERROR, "libc", + "The property name length for \"%s\" is >= %d;" + " please use __system_property_read_callback" + " to read this property. (the name is truncated to \"%s\")", + pi->name, PROP_NAME_MAX - 1, name); + } + } + if (is_read_only(pi->name) && pi->is_long()) { + async_safe_format_log( + ANDROID_LOG_ERROR, "libc", + "The property \"%s\" has a value with length %zu that is too large for" + " __system_property_get()/__system_property_read(); use" + " __system_property_read_callback() instead.", + pi->name, strlen(pi->long_value())); + } + return len; + } + } +} + +void SystemProperties::ReadCallback(const prop_info* pi, + void (*callback)(void* cookie, const char* name, + const char* value, uint32_t serial), + void* cookie) { + // Read only properties don't need to copy the value to a temporary buffer, since it can never + // change. + if (is_read_only(pi->name)) { + uint32_t serial = Serial(pi); + if (pi->is_long()) { + callback(cookie, pi->name, pi->long_value(), serial); + } else { + callback(cookie, pi->name, pi->value, serial); + } + return; + } + + while (true) { + uint32_t serial = Serial(pi); // acquire semantics + size_t len = SERIAL_VALUE_LEN(serial); + char value_buf[len + 1]; + + memcpy(value_buf, pi->value, len); + value_buf[len] = '\0'; + + // TODO: see todo in Read function + atomic_thread_fence(memory_order_acquire); + if (serial == load_const_atomic(&(pi->serial), memory_order_relaxed)) { + callback(cookie, pi->name, value_buf, serial); + return; + } + } +} + +int SystemProperties::Get(const char* name, char* value) { + const prop_info* pi = Find(name); + + if (pi != nullptr) { + return Read(pi, nullptr, value); + } else { + value[0] = 0; + return 0; + } +} + +int SystemProperties::Update(prop_info* pi, const char* value, unsigned int len) { + if (len >= PROP_VALUE_MAX) { + return -1; + } + + if (!initialized_) { + return -1; + } + + prop_area* pa = contexts_->GetSerialPropArea(); + if (!pa) { + return -1; + } + + uint32_t serial = atomic_load_explicit(&pi->serial, memory_order_relaxed); + serial |= 1; + atomic_store_explicit(&pi->serial, serial, memory_order_relaxed); + // The memcpy call here also races. Again pretend it + // used memory_order_relaxed atomics, and use the analogous + // counterintuitive fence. + atomic_thread_fence(memory_order_release); + strlcpy(pi->value, value, len + 1); + + atomic_store_explicit(&pi->serial, (len << 24) | ((serial + 1) & 0xffffff), memory_order_release); + __futex_wake(&pi->serial, INT32_MAX); + + atomic_store_explicit(pa->serial(), atomic_load_explicit(pa->serial(), memory_order_relaxed) + 1, + memory_order_release); + __futex_wake(pa->serial(), INT32_MAX); + + return 0; +} + +int SystemProperties::Add(const char* name, unsigned int namelen, const char* value, + unsigned int valuelen) { + if (valuelen >= PROP_VALUE_MAX && !is_read_only(name)) { + return -1; + } + + if (namelen < 1) { + return -1; + } + + if (!initialized_) { + return -1; + } + + prop_area* serial_pa = contexts_->GetSerialPropArea(); + if (serial_pa == nullptr) { + return -1; + } + + prop_area* pa = contexts_->GetPropAreaForName(name); + if (!pa) { + async_safe_format_log(ANDROID_LOG_ERROR, "libc", "Access denied adding property \"%s\"", name); + return -1; + } + + bool ret = pa->add(name, namelen, value, valuelen); + if (!ret) { + return -1; + } + + // There is only a single mutator, but we want to make sure that + // updates are visible to a reader waiting for the update. + atomic_store_explicit(serial_pa->serial(), + atomic_load_explicit(serial_pa->serial(), memory_order_relaxed) + 1, + memory_order_release); + __futex_wake(serial_pa->serial(), INT32_MAX); + return 0; +} + +// Wait for non-locked serial, and retrieve it with acquire semantics. +uint32_t SystemProperties::Serial(const prop_info* pi) { + uint32_t serial = load_const_atomic(&pi->serial, memory_order_acquire); + while (SERIAL_DIRTY(serial)) { + __futex_wait(const_cast<_Atomic(uint_least32_t)*>(&pi->serial), serial, nullptr); + serial = load_const_atomic(&pi->serial, memory_order_acquire); + } + return serial; +} + +uint32_t SystemProperties::WaitAny(uint32_t old_serial) { + uint32_t new_serial; + Wait(nullptr, old_serial, &new_serial, nullptr); + return new_serial; +} + +bool SystemProperties::Wait(const prop_info* pi, uint32_t old_serial, uint32_t* new_serial_ptr, + const timespec* relative_timeout) { + // Are we waiting on the global serial or a specific serial? + atomic_uint_least32_t* serial_ptr; + if (pi == nullptr) { + if (!initialized_) { + return -1; + } + + prop_area* serial_pa = contexts_->GetSerialPropArea(); + if (serial_pa == nullptr) { + return -1; + } + + serial_ptr = serial_pa->serial(); + } else { + serial_ptr = const_cast(&pi->serial); + } + + uint32_t new_serial; + do { + int rc; + if ((rc = __futex_wait(serial_ptr, old_serial, relative_timeout)) != 0 && rc == -ETIMEDOUT) { + return false; + } + new_serial = load_const_atomic(serial_ptr, memory_order_acquire); + } while (new_serial == old_serial); + + *new_serial_ptr = new_serial; + return true; +} + +const prop_info* SystemProperties::FindNth(unsigned n) { + struct find_nth { + const uint32_t sought; + uint32_t current; + const prop_info* result; + + explicit find_nth(uint32_t n) : sought(n), current(0), result(nullptr) { + } + static void fn(const prop_info* pi, void* ptr) { + find_nth* self = reinterpret_cast(ptr); + if (self->current++ == self->sought) self->result = pi; + } + } state(n); + Foreach(find_nth::fn, &state); + return state.result; +} + +int SystemProperties::Foreach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) { + if (!initialized_) { + return -1; + } + + contexts_->ForEach(propfn, cookie); + + return 0; +} diff --git a/native/jni/resetprop/persist_props.c b/native/jni/resetprop/persist_properties.c similarity index 100% rename from native/jni/resetprop/persist_props.c rename to native/jni/resetprop/persist_properties.c diff --git a/native/jni/resetprop/private/_system_properties.h b/native/jni/resetprop/private/_system_properties.h index fde64d766..1b5871309 100644 --- a/native/jni/resetprop/private/_system_properties.h +++ b/native/jni/resetprop/private/_system_properties.h @@ -36,6 +36,7 @@ #error you should #include instead #endif +//#include #include "system_properties.h" __BEGIN_DECLS @@ -58,17 +59,17 @@ __BEGIN_DECLS #define PROP_ERROR_SET_FAILED 0x0024 /* -** Map the property area from the specified filename. This -** method is for testing only. +** This was previously for testing, but now that SystemProperties is its own testable class, +** there is never a reason to call this function and its implementation simply returns -1. */ -int __system_property_set_filename(const char *filename); +int __system_property_set_filename(const char* __filename); /* ** Initialize the area to be used to store properties. Can ** only be done by a single process that has write access to ** the property area. */ -int __system_property_area_init(); +int __system_property_area_init(void); /* Read the global serial number of the system properties ** @@ -92,7 +93,7 @@ int __system_property_area_init(); ** ** Returns the serial number on success, -1 on error. */ -uint32_t __system_property_area_serial(); +uint32_t __system_property_area_serial(void); /* Add a new system property. Can only be done by a single ** process that has write access to the property area, and @@ -102,13 +103,7 @@ uint32_t __system_property_area_serial(); ** ** Returns 0 on success, -1 if the property area is full. */ -int __system_property_add(const char *name, unsigned int namelen, const char *value, unsigned int valuelen); - -/* Delete a new system property. Added in resetprop -** -** Returns 0 on success, -1 if the property area is full. -*/ -int __system_property_del(const char *name); +int __system_property_add(const char* __name, unsigned int __name_length, const char* __value, unsigned int __value_length); /* Update the value of a system property returned by ** __system_property_find. Can only be done by a single process @@ -118,14 +113,14 @@ int __system_property_del(const char *name); ** ** Returns 0 on success, -1 if the parameters are incorrect. */ -int __system_property_update(prop_info *pi, const char *value, unsigned int len); +int __system_property_update(prop_info* __pi, const char* __value, unsigned int __value_length); /* Read the serial number of a system property returned by ** __system_property_find. ** ** Returns the serial number on success, -1 on error. */ -uint32_t __system_property_serial(const prop_info* pi); +uint32_t __system_property_serial(const prop_info* __pi); /* Initialize the system properties area in read only mode. * Should be done by all processes that need to read system @@ -133,10 +128,10 @@ uint32_t __system_property_serial(const prop_info* pi); * * Returns 0 on success, -1 otherwise. */ -int __system_properties_init(); +int __system_properties_init(void); /* Deprecated: use __system_property_wait instead. */ -uint32_t __system_property_wait_any(uint32_t old_serial); +uint32_t __system_property_wait_any(uint32_t __old_serial); __END_DECLS diff --git a/native/jni/resetprop/private/bionic_defs.h b/native/jni/resetprop/private/bionic_defs.h new file mode 100644 index 000000000..1d4f86b9b --- /dev/null +++ b/native/jni/resetprop/private/bionic_defs.h @@ -0,0 +1,39 @@ +/* + * Copyright (C) 2017 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef __BIONIC_PRIVATE_BIONIC_DEFS_H_ +#define __BIONIC_PRIVATE_BIONIC_DEFS_H_ + +/* + * This label is used to mark libc/libdl symbols that may need to be replaced + * by native bridge implementation. + */ +#define __BIONIC_WEAK_FOR_NATIVE_BRIDGE __attribute__((__weak__, __noinline__)) +#define __BIONIC_WEAK_VARIABLE_FOR_NATIVE_BRIDGE __attribute__((__weak__)) + +#endif /* __BIONIC_PRIVATE_BIONIC_DEFS_H_ */ diff --git a/native/jni/resetprop/private/bionic_macros.h b/native/jni/resetprop/private/bionic_macros.h index 303218e28..0a36cdb18 100644 --- a/native/jni/resetprop/private/bionic_macros.h +++ b/native/jni/resetprop/private/bionic_macros.h @@ -40,9 +40,6 @@ TypeName() = delete; \ DISALLOW_COPY_AND_ASSIGN(TypeName) -#define BIONIC_ALIGN(value, alignment) \ - (((value) + (alignment) - 1) & ~((alignment) - 1)) - #define BIONIC_ROUND_UP_POWER_OF_2(value) \ ((sizeof(value) == 8) \ ? (1UL << (64 - __builtin_clzl(static_cast(value)))) \ @@ -66,4 +63,43 @@ static inline T* align_up(T* p, size_t align) { return reinterpret_cast(align_up(reinterpret_cast(p), align)); } +#if defined(__arm__) +// Do not emit anything for arm, clang does not allow emiting an arm unwind +// directive. +// #define BIONIC_STOP_UNWIND asm volatile(".cantunwind") +#define BIONIC_STOP_UNWIND +#elif defined(__aarch64__) +#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined x30") +#elif defined(__i386__) +#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%eip") +#elif defined(__x86_64__) +#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%rip") +#elif defined (__mips__) +#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined $ra") +#endif + +// The arraysize(arr) macro returns the # of elements in an array arr. +// The expression is a compile-time constant, and therefore can be +// used in defining new arrays, for example. If you use arraysize on +// a pointer by mistake, you will get a compile-time error. +// +// One caveat is that arraysize() doesn't accept any array of an +// anonymous type or a type defined inside a function. +// +// This template function declaration is used in defining arraysize. +// Note that the function doesn't need an implementation, as we only +// use its type. +template +char (&ArraySizeHelper(T (&array)[N]))[N]; // NOLINT(readability/casting) + +#define arraysize(array) (sizeof(ArraySizeHelper(array))) + +// Used to inform clang's -Wimplicit-fallthrough that a fallthrough is intended. There's no way to +// silence (or enable, apparently) -Wimplicit-fallthrough in C yet. +#ifdef __cplusplus +#define __BIONIC_FALLTHROUGH [[clang::fallthrough]] +#else +#define __BIONIC_FALLTHROUGH +#endif + #endif // _BIONIC_MACROS_H_ diff --git a/native/jni/resetprop/private/futex.h b/native/jni/resetprop/private/futex.h deleted file mode 100644 index 968936678..000000000 --- a/native/jni/resetprop/private/futex.h +++ /dev/null @@ -1,77 +0,0 @@ -/**************************************************************************** - **************************************************************************** - *** - *** This header was automatically generated from a Linux kernel header - *** of the same name, to make information necessary for userspace to - *** call into the kernel available to libc. It contains only constants, - *** structures, and macros generated from the original header, and thus, - *** contains no copyrightable information. - *** - *** To edit the content of this header, modify the corresponding - *** source file (e.g. under external/kernel-headers/original/) then - *** run bionic/libc/kernel/tools/update_all.py - *** - *** Any manual change here will be lost the next time this script will - *** be run. You've been warned! - *** - **************************************************************************** - ****************************************************************************/ -#ifndef _UAPI_LINUX_FUTEX_H -#define _UAPI_LINUX_FUTEX_H -#include -#include -#define FUTEX_WAIT 0 -#define FUTEX_WAKE 1 -#define FUTEX_FD 2 -#define FUTEX_REQUEUE 3 -#define FUTEX_CMP_REQUEUE 4 -#define FUTEX_WAKE_OP 5 -#define FUTEX_LOCK_PI 6 -#define FUTEX_UNLOCK_PI 7 -#define FUTEX_TRYLOCK_PI 8 -#define FUTEX_WAIT_BITSET 9 -#define FUTEX_WAKE_BITSET 10 -#define FUTEX_WAIT_REQUEUE_PI 11 -#define FUTEX_CMP_REQUEUE_PI 12 -#define FUTEX_PRIVATE_FLAG 128 -#define FUTEX_CLOCK_REALTIME 256 -#define FUTEX_CMD_MASK ~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME) -#define FUTEX_WAIT_PRIVATE (FUTEX_WAIT | FUTEX_PRIVATE_FLAG) -#define FUTEX_WAKE_PRIVATE (FUTEX_WAKE | FUTEX_PRIVATE_FLAG) -#define FUTEX_REQUEUE_PRIVATE (FUTEX_REQUEUE | FUTEX_PRIVATE_FLAG) -#define FUTEX_CMP_REQUEUE_PRIVATE (FUTEX_CMP_REQUEUE | FUTEX_PRIVATE_FLAG) -#define FUTEX_WAKE_OP_PRIVATE (FUTEX_WAKE_OP | FUTEX_PRIVATE_FLAG) -#define FUTEX_LOCK_PI_PRIVATE (FUTEX_LOCK_PI | FUTEX_PRIVATE_FLAG) -#define FUTEX_UNLOCK_PI_PRIVATE (FUTEX_UNLOCK_PI | FUTEX_PRIVATE_FLAG) -#define FUTEX_TRYLOCK_PI_PRIVATE (FUTEX_TRYLOCK_PI | FUTEX_PRIVATE_FLAG) -#define FUTEX_WAIT_BITSET_PRIVATE (FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG) -#define FUTEX_WAKE_BITSET_PRIVATE (FUTEX_WAKE_BITSET | FUTEX_PRIVATE_FLAG) -#define FUTEX_WAIT_REQUEUE_PI_PRIVATE (FUTEX_WAIT_REQUEUE_PI | FUTEX_PRIVATE_FLAG) -#define FUTEX_CMP_REQUEUE_PI_PRIVATE (FUTEX_CMP_REQUEUE_PI | FUTEX_PRIVATE_FLAG) -struct robust_list { - struct robust_list __user * next; -}; -struct robust_list_head { - struct robust_list list; - long futex_offset; - struct robust_list __user * list_op_pending; -}; -#define FUTEX_WAITERS 0x80000000 -#define FUTEX_OWNER_DIED 0x40000000 -#define FUTEX_TID_MASK 0x3fffffff -#define ROBUST_LIST_LIMIT 2048 -#define FUTEX_BITSET_MATCH_ANY 0xffffffff -#define FUTEX_OP_SET 0 -#define FUTEX_OP_ADD 1 -#define FUTEX_OP_OR 2 -#define FUTEX_OP_ANDN 3 -#define FUTEX_OP_XOR 4 -#define FUTEX_OP_OPARG_SHIFT 8 -#define FUTEX_OP_CMP_EQ 0 -#define FUTEX_OP_CMP_NE 1 -#define FUTEX_OP_CMP_LT 2 -#define FUTEX_OP_CMP_LE 3 -#define FUTEX_OP_CMP_GT 4 -#define FUTEX_OP_CMP_GE 5 -#define FUTEX_OP(op,oparg,cmp,cmparg) (((op & 0xf) << 28) | ((cmp & 0xf) << 24) | ((oparg & 0xfff) << 12) | (cmparg & 0xfff)) -#endif diff --git a/native/jni/resetprop/private/redefs.h b/native/jni/resetprop/private/redefs.h index 61b7a8e81..6e6e7cec9 100644 --- a/native/jni/resetprop/private/redefs.h +++ b/native/jni/resetprop/private/redefs.h @@ -17,5 +17,6 @@ #define __system_property_serial __system_property_serial2 #define __system_properties_init __system_properties_init2 #define __system_property_wait_any __system_property_wait_any2 +#define __system_property_del(x) -1 /* Temp disable */ #endif //REDEFS_H diff --git a/native/jni/resetprop/private/stdatomic.h b/native/jni/resetprop/private/stdatomic.h deleted file mode 100644 index c0b639d63..000000000 --- a/native/jni/resetprop/private/stdatomic.h +++ /dev/null @@ -1,370 +0,0 @@ -/* - * An implementation of C11 stdatomic.h directly borrowed from FreeBSD - * (original copyright follows), with minor modifications for - * portability to other systems. Works for recent Clang (that - * implement the feature c_atomic) and GCC 4.7+; includes - * compatibility for GCC below 4.7 but I wouldn't recommend it. - * - * Caveats and limitations: - * - Only the ``_Atomic parentheses'' notation is implemented, while - * the ``_Atomic space'' one is not. - * - _Atomic types must be typedef'ed, or programs using them will - * not type check correctly (incompatible anonymous structure - * types). - * - Non-scalar _Atomic types would require runtime support for - * runtime locking, which, as far as I know, is not currently - * available on any system. - */ - -/*- - * Copyright (c) 2011 Ed Schouten - * David Chisnall - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $FreeBSD: src/include/stdatomic.h,v 1.10.2.2 2012/05/30 19:21:54 theraven Exp $ - */ - -#ifndef _STDATOMIC_H_ -#define _STDATOMIC_H_ - -#include -#include -#define _Bool bool - -#if !defined(__has_feature) -#define __has_feature(x) 0 -#endif -#if !defined(__has_builtin) -#define __has_builtin(x) 0 -#endif -#if !defined(__GNUC_PREREQ__) -#if defined(__GNUC__) && defined(__GNUC_MINOR__) -#define __GNUC_PREREQ__(maj, min) \ - ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) -#else -#define __GNUC_PREREQ__(maj, min) 0 -#endif -#endif - -#if !defined(__CLANG_ATOMICS) && !defined(__GNUC_ATOMICS) -#if __has_feature(c_atomic) -#define __CLANG_ATOMICS -#elif __GNUC_PREREQ__(4, 7) -#define __GNUC_ATOMICS -#elif !defined(__GNUC__) -#error "stdatomic.h does not support your compiler" -#endif -#endif - -#if !defined(__CLANG_ATOMICS) -#define _Atomic(T) struct { volatile __typeof__(T) __val; } -#endif - -/* - * 7.17.2 Initialization. - */ - -#if defined(__CLANG_ATOMICS) -#define ATOMIC_VAR_INIT(value) (value) -#define atomic_init(obj, value) __c11_atomic_init(obj, value) -#else -#define ATOMIC_VAR_INIT(value) { .__val = (value) } -#define atomic_init(obj, value) do { \ - (obj)->__val = (value); \ -} while (0) -#endif - -/* - * Clang and recent GCC both provide predefined macros for the memory - * orderings. If we are using a compiler that doesn't define them, use the - * clang values - these will be ignored in the fallback path. - */ - -#ifndef __ATOMIC_RELAXED -#define __ATOMIC_RELAXED 0 -#endif -#ifndef __ATOMIC_CONSUME -#define __ATOMIC_CONSUME 1 -#endif -#ifndef __ATOMIC_ACQUIRE -#define __ATOMIC_ACQUIRE 2 -#endif -#ifndef __ATOMIC_RELEASE -#define __ATOMIC_RELEASE 3 -#endif -#ifndef __ATOMIC_ACQ_REL -#define __ATOMIC_ACQ_REL 4 -#endif -#ifndef __ATOMIC_SEQ_CST -#define __ATOMIC_SEQ_CST 5 -#endif - -/* - * 7.17.3 Order and consistency. - * - * The memory_order_* constants that denote the barrier behaviour of the - * atomic operations. - */ - -enum memory_order { - memory_order_relaxed = __ATOMIC_RELAXED, - memory_order_consume = __ATOMIC_CONSUME, - memory_order_acquire = __ATOMIC_ACQUIRE, - memory_order_release = __ATOMIC_RELEASE, - memory_order_acq_rel = __ATOMIC_ACQ_REL, - memory_order_seq_cst = __ATOMIC_SEQ_CST -}; - -typedef enum memory_order memory_order; - -/* - * 7.17.4 Fences. - */ - -#ifdef __CLANG_ATOMICS -#define atomic_thread_fence(order) __c11_atomic_thread_fence(order) -#define atomic_signal_fence(order) __c11_atomic_signal_fence(order) -#elif defined(__GNUC_ATOMICS) -#define atomic_thread_fence(order) __atomic_thread_fence(order) -#define atomic_signal_fence(order) __atomic_signal_fence(order) -#else -#define atomic_thread_fence(order) __sync_synchronize() -#define atomic_signal_fence(order) __asm volatile ("" : : : "memory") -#endif - -/* - * 7.17.5 Lock-free property. - */ - -#if defined(__CLANG_ATOMICS) -#define atomic_is_lock_free(obj) \ - __c11_atomic_is_lock_free(sizeof(obj)) -#elif defined(__GNUC_ATOMICS) -#define atomic_is_lock_free(obj) \ - __atomic_is_lock_free(sizeof((obj)->__val)) -#else -#define atomic_is_lock_free(obj) \ - (sizeof((obj)->__val) <= sizeof(void *)) -#endif - -/* - * 7.17.6 Atomic integer types. - */ - -typedef _Atomic(_Bool) atomic_bool; -typedef _Atomic(char) atomic_char; -typedef _Atomic(signed char) atomic_schar; -typedef _Atomic(unsigned char) atomic_uchar; -typedef _Atomic(short) atomic_short; -typedef _Atomic(unsigned short) atomic_ushort; -typedef _Atomic(int) atomic_int; -typedef _Atomic(unsigned int) atomic_uint; -typedef _Atomic(long) atomic_long; -typedef _Atomic(unsigned long) atomic_ulong; -typedef _Atomic(long long) atomic_llong; -typedef _Atomic(unsigned long long) atomic_ullong; -#if 0 -typedef _Atomic(char16_t) atomic_char16_t; -typedef _Atomic(char32_t) atomic_char32_t; -#endif -typedef _Atomic(wchar_t) atomic_wchar_t; -typedef _Atomic(int_least8_t) atomic_int_least8_t; -typedef _Atomic(uint_least8_t) atomic_uint_least8_t; -typedef _Atomic(int_least16_t) atomic_int_least16_t; -typedef _Atomic(uint_least16_t) atomic_uint_least16_t; -typedef _Atomic(int_least32_t) atomic_int_least32_t; -typedef _Atomic(uint_least32_t) atomic_uint_least32_t; -typedef _Atomic(int_least64_t) atomic_int_least64_t; -typedef _Atomic(uint_least64_t) atomic_uint_least64_t; -typedef _Atomic(int_fast8_t) atomic_int_fast8_t; -typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t; -typedef _Atomic(int_fast16_t) atomic_int_fast16_t; -typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t; -typedef _Atomic(int_fast32_t) atomic_int_fast32_t; -typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t; -typedef _Atomic(int_fast64_t) atomic_int_fast64_t; -typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t; -typedef _Atomic(intptr_t) atomic_intptr_t; -typedef _Atomic(uintptr_t) atomic_uintptr_t; -typedef _Atomic(size_t) atomic_size_t; -typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t; -typedef _Atomic(intmax_t) atomic_intmax_t; -typedef _Atomic(uintmax_t) atomic_uintmax_t; - -/* - * 7.17.7 Operations on atomic types. - */ - -/* - * Compiler-specific operations. - */ - -#if defined(__CLANG_ATOMICS) -#define atomic_compare_exchange_strong_explicit(object, expected, \ - desired, success, failure) \ - __c11_atomic_compare_exchange_strong(object, expected, desired, \ - success, failure) -#define atomic_compare_exchange_weak_explicit(object, expected, \ - desired, success, failure) \ - __c11_atomic_compare_exchange_weak(object, expected, desired, \ - success, failure) -#define atomic_exchange_explicit(object, desired, order) \ - __c11_atomic_exchange(object, desired, order) -#define atomic_fetch_add_explicit(object, operand, order) \ - __c11_atomic_fetch_add(object, operand, order) -#define atomic_fetch_and_explicit(object, operand, order) \ - __c11_atomic_fetch_and(object, operand, order) -#define atomic_fetch_or_explicit(object, operand, order) \ - __c11_atomic_fetch_or(object, operand, order) -#define atomic_fetch_sub_explicit(object, operand, order) \ - __c11_atomic_fetch_sub(object, operand, order) -#define atomic_fetch_xor_explicit(object, operand, order) \ - __c11_atomic_fetch_xor(object, operand, order) -#define atomic_load_explicit(object, order) \ - __c11_atomic_load(object, order) -#define atomic_store_explicit(object, desired, order) \ - __c11_atomic_store(object, desired, order) -#elif defined(__GNUC_ATOMICS) -#define atomic_compare_exchange_strong_explicit(object, expected, \ - desired, success, failure) \ - __atomic_compare_exchange_n(&(object)->__val, expected, \ - desired, 0, success, failure) -#define atomic_compare_exchange_weak_explicit(object, expected, \ - desired, success, failure) \ - __atomic_compare_exchange_n(&(object)->__val, expected, \ - desired, 1, success, failure) -#define atomic_exchange_explicit(object, desired, order) \ - __atomic_exchange_n(&(object)->__val, desired, order) -#define atomic_fetch_add_explicit(object, operand, order) \ - __atomic_fetch_add(&(object)->__val, operand, order) -#define atomic_fetch_and_explicit(object, operand, order) \ - __atomic_fetch_and(&(object)->__val, operand, order) -#define atomic_fetch_or_explicit(object, operand, order) \ - __atomic_fetch_or(&(object)->__val, operand, order) -#define atomic_fetch_sub_explicit(object, operand, order) \ - __atomic_fetch_sub(&(object)->__val, operand, order) -#define atomic_fetch_xor_explicit(object, operand, order) \ - __atomic_fetch_xor(&(object)->__val, operand, order) -#define atomic_load_explicit(object, order) \ - __atomic_load_n(&(object)->__val, order) -#define atomic_store_explicit(object, desired, order) \ - __atomic_store_n(&(object)->__val, desired, order) -#else -#define atomic_compare_exchange_strong_explicit(object, expected, \ - desired, success, failure) ({ \ - __typeof__((object)->__val) __v; \ - _Bool __r; \ - __v = __sync_val_compare_and_swap(&(object)->__val, \ - *(expected), desired); \ - __r = *(expected) == __v; \ - *(expected) = __v; \ - __r; \ -}) - -#define atomic_compare_exchange_weak_explicit(object, expected, \ - desired, success, failure) \ - atomic_compare_exchange_strong_explicit(object, expected, \ - desired, success, failure) -#if __has_builtin(__sync_swap) -/* Clang provides a full-barrier atomic exchange - use it if available. */ -#define atomic_exchange_explicit(object, desired, order) \ - __sync_swap(&(object)->__val, desired) -#else -/* - * __sync_lock_test_and_set() is only an acquire barrier in theory (although in - * practice it is usually a full barrier) so we need an explicit barrier after - * it. - */ -#define atomic_exchange_explicit(object, desired, order) ({ \ - __typeof__((object)->__val) __v; \ - __v = __sync_lock_test_and_set(&(object)->__val, desired); \ - __sync_synchronize(); \ - __v; \ -}) -#endif -#define atomic_fetch_add_explicit(object, operand, order) \ - __sync_fetch_and_add(&(object)->__val, operand) -#define atomic_fetch_and_explicit(object, operand, order) \ - __sync_fetch_and_and(&(object)->__val, operand) -#define atomic_fetch_or_explicit(object, operand, order) \ - __sync_fetch_and_or(&(object)->__val, operand) -#define atomic_fetch_sub_explicit(object, operand, order) \ - __sync_fetch_and_sub(&(object)->__val, operand) -#define atomic_fetch_xor_explicit(object, operand, order) \ - __sync_fetch_and_xor(&(object)->__val, operand) -#define atomic_load_explicit(object, order) \ - __sync_fetch_and_add(&(object)->__val, 0) -#define atomic_store_explicit(object, desired, order) do { \ - __sync_synchronize(); \ - (object)->__val = (desired); \ - __sync_synchronize(); \ -} while (0) -#endif - -/* - * Convenience functions. - */ - -#define atomic_compare_exchange_strong(object, expected, desired) \ - atomic_compare_exchange_strong_explicit(object, expected, \ - desired, memory_order_seq_cst, memory_order_seq_cst) -#define atomic_compare_exchange_weak(object, expected, desired) \ - atomic_compare_exchange_weak_explicit(object, expected, \ - desired, memory_order_seq_cst, memory_order_seq_cst) -#define atomic_exchange(object, desired) \ - atomic_exchange_explicit(object, desired, memory_order_seq_cst) -#define atomic_fetch_add(object, operand) \ - atomic_fetch_add_explicit(object, operand, memory_order_seq_cst) -#define atomic_fetch_and(object, operand) \ - atomic_fetch_and_explicit(object, operand, memory_order_seq_cst) -#define atomic_fetch_or(object, operand) \ - atomic_fetch_or_explicit(object, operand, memory_order_seq_cst) -#define atomic_fetch_sub(object, operand) \ - atomic_fetch_sub_explicit(object, operand, memory_order_seq_cst) -#define atomic_fetch_xor(object, operand) \ - atomic_fetch_xor_explicit(object, operand, memory_order_seq_cst) -#define atomic_load(object) \ - atomic_load_explicit(object, memory_order_seq_cst) -#define atomic_store(object, desired) \ - atomic_store_explicit(object, desired, memory_order_seq_cst) - -/* - * 7.17.8 Atomic flag type and operations. - */ - -typedef atomic_bool atomic_flag; - -#define ATOMIC_FLAG_INIT ATOMIC_VAR_INIT(0) - -#define atomic_flag_clear_explicit(object, order) \ - atomic_store_explicit(object, 0, order) -#define atomic_flag_test_and_set_explicit(object, order) \ - atomic_compare_exchange_strong_explicit(object, 0, 1, order, order) - -#define atomic_flag_clear(object) \ - atomic_flag_clear_explicit(object, memory_order_seq_cst) -#define atomic_flag_test_and_set(object) \ - atomic_flag_test_and_set_explicit(object, memory_order_seq_cst) - -#endif /* !_STDATOMIC_H_ */ \ No newline at end of file diff --git a/native/jni/resetprop/private/system_properties.h b/native/jni/resetprop/private/system_properties.h index 9bf8c709e..ad70d4dc4 100644 --- a/native/jni/resetprop/private/system_properties.h +++ b/native/jni/resetprop/private/system_properties.h @@ -33,7 +33,6 @@ #include #include #include - #include "redefs.h" __BEGIN_DECLS @@ -43,9 +42,9 @@ typedef struct prop_info prop_info; #define PROP_VALUE_MAX 92 /* - * Sets system property `key` to `value`, creating the system property if it doesn't already exist. + * Sets system property `name` to `value`, creating the system property if it doesn't already exist. */ -int __system_property_set(const char *key, const char *value); +int __system_property_set(const char* __name, const char* __value) __INTRODUCED_IN(12); /* * Returns a `prop_info` corresponding system property `name`, or nullptr if it doesn't exist. @@ -53,14 +52,14 @@ int __system_property_set(const char *key, const char *value); * * Property lookup is expensive, so it can be useful to cache the result of this function. */ -const prop_info* __system_property_find(const char *name); +const prop_info* __system_property_find(const char* __name); /* * Calls `callback` with a consistent trio of name, value, and serial number for property `pi`. */ -void __system_property_read_callback(const prop_info *pi, - void (*callback)(void* cookie, const char *name, const char *value, uint32_t serial), - void* cookie); +void __system_property_read_callback(const prop_info* __pi, + void (*__callback)(void* __cookie, const char* __name, const char* __value, uint32_t __serial), + void* __cookie) __INTRODUCED_IN(26); /* * Passes a `prop_info` for each system property to the provided @@ -68,7 +67,8 @@ void __system_property_read_callback(const prop_info *pi, * * This method is for inspecting and debugging the property system, and not generally useful. */ -int __system_property_foreach(void (*propfn)(const prop_info *pi, void *cookie), void *cookie); +int __system_property_foreach(void (*__callback)(const prop_info* __pi, void* __cookie), void* __cookie) + __INTRODUCED_IN(19); /* * Waits for the specific system property identified by `pi` to be updated @@ -83,19 +83,17 @@ int __system_property_foreach(void (*propfn)(const prop_info *pi, void *cookie), * timed out. */ struct timespec; -bool __system_property_wait(const prop_info *pi, - uint32_t old_serial, - uint32_t *new_serial_ptr, - const struct timespec *relative_timeout); +bool __system_property_wait(const prop_info* __pi, uint32_t __old_serial, uint32_t* __new_serial_ptr, const struct timespec* __relative_timeout) + __INTRODUCED_IN(26); /* Deprecated. In Android O and above, there's no limit on property name length. */ #define PROP_NAME_MAX 32 /* Deprecated. Use __system_property_read_callback instead. */ -int __system_property_read(const prop_info* pi, char* name, char* value); +int __system_property_read(const prop_info* __pi, char* __name, char* __value); /* Deprecated. Use __system_property_read_callback instead. */ -int __system_property_get(const char* name, char* value); +int __system_property_get(const char* __name, char* __value); /* Deprecated. Use __system_property_foreach instead. */ -const prop_info* __system_property_find_nth(unsigned n); +const prop_info* __system_property_find_nth(unsigned __n); __END_DECLS diff --git a/native/jni/resetprop/private/xattr.h b/native/jni/resetprop/private/xattr.h deleted file mode 100644 index 1da49d123..000000000 --- a/native/jni/resetprop/private/xattr.h +++ /dev/null @@ -1,61 +0,0 @@ -/**************************************************************************** - **************************************************************************** - *** - *** This header was automatically generated from a Linux kernel header - *** of the same name, to make information necessary for userspace to - *** call into the kernel available to libc. It contains only constants, - *** structures, and macros generated from the original header, and thus, - *** contains no copyrightable information. - *** - *** To edit the content of this header, modify the corresponding - *** source file (e.g. under external/kernel-headers/original/) then - *** run bionic/libc/kernel/tools/update_all.py - *** - *** Any manual change here will be lost the next time this script will - *** be run. You've been warned! - *** - **************************************************************************** - ****************************************************************************/ -#ifndef _UAPI_LINUX_XATTR_H -#define _UAPI_LINUX_XATTR_H -#define XATTR_OS2_PREFIX "os2." -#define XATTR_OS2_PREFIX_LEN (sizeof(XATTR_OS2_PREFIX) - 1) -#define XATTR_MAC_OSX_PREFIX "osx." -#define XATTR_MAC_OSX_PREFIX_LEN (sizeof(XATTR_MAC_OSX_PREFIX) - 1) -#define XATTR_BTRFS_PREFIX "btrfs." -#define XATTR_BTRFS_PREFIX_LEN (sizeof(XATTR_BTRFS_PREFIX) - 1) -#define XATTR_SECURITY_PREFIX "security." -#define XATTR_SECURITY_PREFIX_LEN (sizeof(XATTR_SECURITY_PREFIX) - 1) -#define XATTR_SYSTEM_PREFIX "system." -#define XATTR_SYSTEM_PREFIX_LEN (sizeof(XATTR_SYSTEM_PREFIX) - 1) -#define XATTR_TRUSTED_PREFIX "trusted." -#define XATTR_TRUSTED_PREFIX_LEN (sizeof(XATTR_TRUSTED_PREFIX) - 1) -#define XATTR_USER_PREFIX "user." -#define XATTR_USER_PREFIX_LEN (sizeof(XATTR_USER_PREFIX) - 1) -#define XATTR_EVM_SUFFIX "evm" -#define XATTR_NAME_EVM XATTR_SECURITY_PREFIX XATTR_EVM_SUFFIX -#define XATTR_IMA_SUFFIX "ima" -#define XATTR_NAME_IMA XATTR_SECURITY_PREFIX XATTR_IMA_SUFFIX -#define XATTR_SELINUX_SUFFIX "selinux" -#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX -#define XATTR_SMACK_SUFFIX "SMACK64" -#define XATTR_SMACK_IPIN "SMACK64IPIN" -#define XATTR_SMACK_IPOUT "SMACK64IPOUT" -#define XATTR_SMACK_EXEC "SMACK64EXEC" -#define XATTR_SMACK_TRANSMUTE "SMACK64TRANSMUTE" -#define XATTR_SMACK_MMAP "SMACK64MMAP" -#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX -#define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN -#define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT -#define XATTR_NAME_SMACKEXEC XATTR_SECURITY_PREFIX XATTR_SMACK_EXEC -#define XATTR_NAME_SMACKTRANSMUTE XATTR_SECURITY_PREFIX XATTR_SMACK_TRANSMUTE -#define XATTR_NAME_SMACKMMAP XATTR_SECURITY_PREFIX XATTR_SMACK_MMAP -#define XATTR_APPARMOR_SUFFIX "apparmor" -#define XATTR_NAME_APPARMOR XATTR_SECURITY_PREFIX XATTR_APPARMOR_SUFFIX -#define XATTR_CAPS_SUFFIX "capability" -#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX -#define XATTR_POSIX_ACL_ACCESS "posix_acl_access" -#define XATTR_NAME_POSIX_ACL_ACCESS XATTR_SYSTEM_PREFIX XATTR_POSIX_ACL_ACCESS -#define XATTR_POSIX_ACL_DEFAULT "posix_acl_default" -#define XATTR_NAME_POSIX_ACL_DEFAULT XATTR_SYSTEM_PREFIX XATTR_POSIX_ACL_DEFAULT -#endif diff --git a/native/jni/resetprop/system_properties.cpp b/native/jni/resetprop/system_properties.cpp deleted file mode 100644 index 5768f4fa7..000000000 --- a/native/jni/resetprop/system_properties.cpp +++ /dev/null @@ -1,1569 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, - * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT - * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#define typeof __typeof__ -#include -#include -#include -#include -#include -#include "private/stdatomic.h" -#include -#include -#include -#include -#include -#include -#include - -#include "private/xattr.h" -#include -#include -#include -#include -#include -#include -#include -#include -//#include - -#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ -#include "private/_system_properties.h" -#include "private/system_properties.h" - -// #include - -// #include "private/ErrnoRestorer.h" -#include "private/bionic_futex.h" -#include "private/bionic_lock.h" -#include "private/bionic_macros.h" -// #include "private/bionic_sdk_version.h" - -/*************** - * Workarounds * - ***************/ -#define async_safe_format_buffer snprintf -#define async_safe_format_log(...) /* NOP */ -#define CHECK(...) /* NOP */ -#define getline my_getline -static int fsetxattr(int fd, const char *name, const void *value, size_t size, int flags) { - return (int) syscall(__NR_fsetxattr, fd, name, value, size, flags); -} -#ifndef SOCK_CLOEXEC -#define SOCK_CLOEXEC O_CLOEXEC -#endif -#ifndef INT32_MAX -#define INT32_MAX (2147483647) -#endif -extern "C" ssize_t my_getline(char**, size_t*, FILE*); -/****************** - * Workaround End * - ******************/ - -static constexpr int PROP_FILENAME_MAX = 1024; - -static constexpr uint32_t PROP_AREA_MAGIC = 0x504f5250; -static constexpr uint32_t PROP_AREA_VERSION = 0xfc6ed0ab; - -static constexpr size_t PA_SIZE = 128 * 1024; - -#define SERIAL_DIRTY(serial) ((serial)&1) -#define SERIAL_VALUE_LEN(serial) ((serial) >> 24) - -static const char property_service_socket[] = "/dev/socket/" PROP_SERVICE_NAME; -static const char* kServiceVersionPropertyName = "ro.property_service.version"; - -/* - * Properties are stored in a hybrid trie/binary tree structure. - * Each property's name is delimited at '.' characters, and the tokens are put - * into a trie structure. Siblings at each level of the trie are stored in a - * binary tree. For instance, "ro.secure"="1" could be stored as follows: - * - * +-----+ children +----+ children +--------+ - * | |-------------->| ro |-------------->| secure | - * +-----+ +----+ +--------+ - * / \ / | - * left / \ right left / | prop +===========+ - * v v v +-------->| ro.secure | - * +-----+ +-----+ +-----+ +-----------+ - * | net | | sys | | com | | 1 | - * +-----+ +-----+ +-----+ +===========+ - */ - -// Represents a node in the trie. -struct prop_bt { - uint32_t namelen; - - // The property trie is updated only by the init process (single threaded) which provides - // property service. And it can be read by multiple threads at the same time. - // As the property trie is not protected by locks, we use atomic_uint_least32_t types for the - // left, right, children "pointers" in the trie node. To make sure readers who see the - // change of "pointers" can also notice the change of prop_bt structure contents pointed by - // the "pointers", we always use release-consume ordering pair when accessing these "pointers". - - // prop "points" to prop_info structure if there is a propery associated with the trie node. - // Its situation is similar to the left, right, children "pointers". So we use - // atomic_uint_least32_t and release-consume ordering to protect it as well. - - // We should also avoid rereading these fields redundantly, since not - // all processor implementations ensure that multiple loads from the - // same field are carried out in the right order. - atomic_uint_least32_t prop; - - atomic_uint_least32_t left; - atomic_uint_least32_t right; - - atomic_uint_least32_t children; - - char name[0]; - - prop_bt(const char* name, const uint32_t name_length) { - this->namelen = name_length; - memcpy(this->name, name, name_length); - this->name[name_length] = '\0'; - } - - private: - DISALLOW_COPY_AND_ASSIGN(prop_bt); -}; - -class prop_area { - public: - prop_area(const uint32_t magic, const uint32_t version) : magic_(magic), version_(version) { - atomic_init(&serial_, 0); - memset(reserved_, 0, sizeof(reserved_)); - // Allocate enough space for the root node. - bytes_used_ = sizeof(prop_bt); - } - - const prop_info* find(const char* name); - bool del(const char *name); /* resetprop add */ - bool add(const char* name, unsigned int namelen, const char* value, unsigned int valuelen); - - bool foreach (void (*propfn)(const prop_info* pi, void* cookie), void* cookie); - - atomic_uint_least32_t* serial() { - return &serial_; - } - uint32_t magic() const { - return magic_; - } - uint32_t version() const { - return version_; - } - - private: - void* allocate_obj(const size_t size, uint_least32_t* const off); - prop_bt* new_prop_bt(const char* name, uint32_t namelen, uint_least32_t* const off); - prop_info* new_prop_info(const char* name, uint32_t namelen, const char* value, uint32_t valuelen, - uint_least32_t* const off); - void* to_prop_obj(uint_least32_t off); - prop_bt* to_prop_bt(atomic_uint_least32_t* off_p); - prop_info* to_prop_info(atomic_uint_least32_t* off_p); - - prop_bt* root_node(); - - prop_bt* find_prop_bt(prop_bt* const bt, const char* name, uint32_t namelen, bool alloc_if_needed); - - const prop_info* find_property(prop_bt* const trie, const char* name, uint32_t namelen, - const char* value, uint32_t valuelen, bool alloc_if_needed); - - bool find_property_and_del(prop_bt *const trie, const char *name); /* resetprop add */ - - bool foreach_property(prop_bt* const trie, void (*propfn)(const prop_info* pi, void* cookie), - void* cookie); - - uint32_t bytes_used_; - atomic_uint_least32_t serial_; - uint32_t magic_; - uint32_t version_; - uint32_t reserved_[28]; - char data_[0]; - - DISALLOW_COPY_AND_ASSIGN(prop_area); -}; - -struct prop_info { - atomic_uint_least32_t serial; - // we need to keep this buffer around because the property - // value can be modified whereas name is constant. - char value[PROP_VALUE_MAX]; - char name[0]; - - prop_info(const char* name, uint32_t namelen, const char* value, uint32_t valuelen) { - memcpy(this->name, name, namelen); - this->name[namelen] = '\0'; - atomic_init(&this->serial, valuelen << 24); - memcpy(this->value, value, valuelen); - this->value[valuelen] = '\0'; - } - - private: - DISALLOW_IMPLICIT_CONSTRUCTORS(prop_info); -}; - -// This is public because it was exposed in the NDK. As of 2017-01, ~60 apps reference this symbol. -// Change to static, we don't want to use the global libc reference -static prop_area* __system_property_area__ = nullptr; - -static char property_filename[PROP_FILENAME_MAX] = PROP_FILENAME; -static size_t pa_data_size; -static size_t pa_size; -static bool initialized = false; - -static prop_area* map_prop_area_rw(const char* filename, const char* context, - bool* fsetxattr_failed) { - /* dev is a tmpfs that we can use to carve a shared workspace - * out of, so let's do that... - */ - const int fd = open(filename, O_RDWR | O_CREAT | O_NOFOLLOW | O_CLOEXEC | O_EXCL, 0444); - - if (fd < 0) { - if (errno == EACCES) { - /* for consistency with the case where the process has already - * mapped the page in and segfaults when trying to write to it - */ - abort(); - } - return nullptr; - } - - if (context) { - if (fsetxattr(fd, XATTR_NAME_SELINUX, context, strlen(context) + 1, 0) != 0) { - async_safe_format_log(ANDROID_LOG_ERROR, "libc", - "fsetxattr failed to set context (%s) for \"%s\"", context, filename); - /* - * fsetxattr() will fail during system properties tests due to selinux policy. - * We do not want to create a custom policy for the tester, so we will continue in - * this function but set a flag that an error has occurred. - * Init, which is the only daemon that should ever call this function will abort - * when this error occurs. - * Otherwise, the tester will ignore it and continue, albeit without any selinux - * property separation. - */ - if (fsetxattr_failed) { - *fsetxattr_failed = true; - } - } - } - - if (ftruncate(fd, PA_SIZE) < 0) { - close(fd); - return nullptr; - } - - pa_size = PA_SIZE; - pa_data_size = pa_size - sizeof(prop_area); - - void* const memory_area = mmap(nullptr, pa_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); - if (memory_area == MAP_FAILED) { - close(fd); - return nullptr; - } - - prop_area* pa = new (memory_area) prop_area(PROP_AREA_MAGIC, PROP_AREA_VERSION); - - close(fd); - return pa; -} - -// resetprop: map the memory as rw -static prop_area* map_fd_rw(const int fd) { - struct stat fd_stat; - if (fstat(fd, &fd_stat) < 0) { - return nullptr; - } - - if ((fd_stat.st_uid != 0) || (fd_stat.st_gid != 0) || - ((fd_stat.st_mode & (S_IWGRP | S_IWOTH)) != 0) || - (fd_stat.st_size < static_cast(sizeof(prop_area)))) { - return nullptr; - } - - pa_size = fd_stat.st_size; - pa_data_size = pa_size - sizeof(prop_area); - - void* const map_result = mmap(nullptr, pa_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); /* resetprop: add PROT_WRITE */ - if (map_result == MAP_FAILED) { - return nullptr; - } - - prop_area* pa = reinterpret_cast(map_result); - if ((pa->magic() != PROP_AREA_MAGIC) || (pa->version() != PROP_AREA_VERSION)) { - munmap(pa, pa_size); - return nullptr; - } - - return pa; -} - -static prop_area* map_prop_area(const char* filename) { - int fd = open(filename, O_CLOEXEC | O_NOFOLLOW | O_RDWR); /* resetprop: O_RDONLY -> O_RDWR */ - if (fd == -1) return nullptr; - - prop_area* map_result = map_fd_rw(fd); - close(fd); - - return map_result; -} - -void* prop_area::allocate_obj(const size_t size, uint_least32_t* const off) { - const size_t aligned = BIONIC_ALIGN(size, sizeof(uint_least32_t)); - if (bytes_used_ + aligned > pa_data_size) { - return nullptr; - } - - *off = bytes_used_; - bytes_used_ += aligned; - return data_ + *off; -} - -prop_bt* prop_area::new_prop_bt(const char* name, uint32_t namelen, uint_least32_t* const off) { - uint_least32_t new_offset; - void* const p = allocate_obj(sizeof(prop_bt) + namelen + 1, &new_offset); - if (p != nullptr) { - prop_bt* bt = new (p) prop_bt(name, namelen); - *off = new_offset; - return bt; - } - - return nullptr; -} - -prop_info* prop_area::new_prop_info(const char* name, uint32_t namelen, const char* value, - uint32_t valuelen, uint_least32_t* const off) { - uint_least32_t new_offset; - void* const p = allocate_obj(sizeof(prop_info) + namelen + 1, &new_offset); - if (p != nullptr) { - prop_info* info = new (p) prop_info(name, namelen, value, valuelen); - *off = new_offset; - return info; - } - - return nullptr; -} - -void* prop_area::to_prop_obj(uint_least32_t off) { - if (off > pa_data_size) return nullptr; - - return (data_ + off); -} - -inline prop_bt* prop_area::to_prop_bt(atomic_uint_least32_t* off_p) { - uint_least32_t off = atomic_load_explicit(off_p, memory_order_consume); - return reinterpret_cast(to_prop_obj(off)); -} - -inline prop_info* prop_area::to_prop_info(atomic_uint_least32_t* off_p) { - uint_least32_t off = atomic_load_explicit(off_p, memory_order_consume); - return reinterpret_cast(to_prop_obj(off)); -} - -inline prop_bt* prop_area::root_node() { - return reinterpret_cast(to_prop_obj(0)); -} - -static int cmp_prop_name(const char* one, uint32_t one_len, const char* two, uint32_t two_len) { - if (one_len < two_len) - return -1; - else if (one_len > two_len) - return 1; - else - return strncmp(one, two, one_len); -} - -prop_bt* prop_area::find_prop_bt(prop_bt* const bt, const char* name, uint32_t namelen, - bool alloc_if_needed) { - prop_bt* current = bt; - while (true) { - if (!current) { - return nullptr; - } - - const int ret = cmp_prop_name(name, namelen, current->name, current->namelen); - if (ret == 0) { - return current; - } - - if (ret < 0) { - uint_least32_t left_offset = atomic_load_explicit(¤t->left, memory_order_relaxed); - if (left_offset != 0) { - current = to_prop_bt(¤t->left); - } else { - if (!alloc_if_needed) { - return nullptr; - } - - uint_least32_t new_offset; - prop_bt* new_bt = new_prop_bt(name, namelen, &new_offset); - if (new_bt) { - atomic_store_explicit(¤t->left, new_offset, memory_order_release); - } - return new_bt; - } - } else { - uint_least32_t right_offset = atomic_load_explicit(¤t->right, memory_order_relaxed); - if (right_offset != 0) { - current = to_prop_bt(¤t->right); - } else { - if (!alloc_if_needed) { - return nullptr; - } - - uint_least32_t new_offset; - prop_bt* new_bt = new_prop_bt(name, namelen, &new_offset); - if (new_bt) { - atomic_store_explicit(¤t->right, new_offset, memory_order_release); - } - return new_bt; - } - } - } -} - -const prop_info* prop_area::find_property(prop_bt* const trie, const char* name, uint32_t namelen, - const char* value, uint32_t valuelen, - bool alloc_if_needed) { - if (!trie) return nullptr; - - const char* remaining_name = name; - prop_bt* current = trie; - while (true) { - const char* sep = strchr(remaining_name, '.'); - const bool want_subtree = (sep != nullptr); - const uint32_t substr_size = (want_subtree) ? sep - remaining_name : strlen(remaining_name); - - if (!substr_size) { - return nullptr; - } - - prop_bt* root = nullptr; - uint_least32_t children_offset = atomic_load_explicit(¤t->children, memory_order_relaxed); - if (children_offset != 0) { - root = to_prop_bt(¤t->children); - } else if (alloc_if_needed) { - uint_least32_t new_offset; - root = new_prop_bt(remaining_name, substr_size, &new_offset); - if (root) { - atomic_store_explicit(¤t->children, new_offset, memory_order_release); - } - } - - if (!root) { - return nullptr; - } - - current = find_prop_bt(root, remaining_name, substr_size, alloc_if_needed); - if (!current) { - return nullptr; - } - - if (!want_subtree) break; - - remaining_name = sep + 1; - } - - uint_least32_t prop_offset = atomic_load_explicit(¤t->prop, memory_order_relaxed); - if (prop_offset != 0) { - return to_prop_info(¤t->prop); - } else if (alloc_if_needed) { - uint_least32_t new_offset; - prop_info* new_info = new_prop_info(name, namelen, value, valuelen, &new_offset); - if (new_info) { - atomic_store_explicit(¤t->prop, new_offset, memory_order_release); - } - - return new_info; - } else { - return nullptr; - } -} - -bool prop_area::find_property_and_del(prop_bt* const trie, const char* name) { - if (!trie) return false; - - const char* remaining_name = name; - prop_bt* current = trie; - while (true) { - const char* sep = strchr(remaining_name, '.'); - const bool want_subtree = (sep != nullptr); - const uint32_t substr_size = (want_subtree) ? sep - remaining_name : strlen(remaining_name); - - if (!substr_size) { - return false; - } - - prop_bt* root = nullptr; - uint_least32_t children_offset = atomic_load_explicit(¤t->children, memory_order_relaxed); - if (children_offset != 0) { - root = to_prop_bt(¤t->children); - } - - if (!root) { - return false; - } - - current = find_prop_bt(root, remaining_name, substr_size, false); - if (!current) { - return false; - } - - if (!want_subtree) break; - - remaining_name = sep + 1; - } - - uint_least32_t prop_offset = atomic_load_explicit(¤t->prop, memory_order_relaxed); - if (prop_offset != 0) { - atomic_store_explicit(¤t->prop, 0, memory_order_release); - return true; - } else { - return false; - } -} - -class PropertyServiceConnection { - public: - PropertyServiceConnection() : last_error_(0) { - socket_ = ::socket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0); - if (socket_ == -1) { - last_error_ = errno; - return; - } - - const size_t namelen = strlen(property_service_socket); - sockaddr_un addr; - memset(&addr, 0, sizeof(addr)); - strlcpy(addr.sun_path, property_service_socket, sizeof(addr.sun_path)); - addr.sun_family = AF_LOCAL; - socklen_t alen = namelen + offsetof(sockaddr_un, sun_path) + 1; - - if (TEMP_FAILURE_RETRY(connect(socket_, reinterpret_cast(&addr), alen)) == -1) { - last_error_ = errno; - close(socket_); - socket_ = -1; - } - } - - bool IsValid() { - return socket_ != -1; - } - - int GetLastError() { - return last_error_; - } - - bool RecvInt32(int32_t* value) { - int result = TEMP_FAILURE_RETRY(recv(socket_, value, sizeof(*value), MSG_WAITALL)); - return CheckSendRecvResult(result, sizeof(*value)); - } - - int socket() { - return socket_; - } - - ~PropertyServiceConnection() { - if (socket_ != -1) { - close(socket_); - } - } - - private: - bool CheckSendRecvResult(int result, int expected_len) { - if (result == -1) { - last_error_ = errno; - } else if (result != expected_len) { - last_error_ = -1; - } else { - last_error_ = 0; - } - - return last_error_ == 0; - } - - int socket_; - int last_error_; - - friend class SocketWriter; -}; - -class SocketWriter { - public: - explicit SocketWriter(PropertyServiceConnection* connection) - : connection_(connection), iov_index_(0), uint_buf_index_(0) - {} - - SocketWriter& WriteUint32(uint32_t value) { - CHECK(uint_buf_index_ < kUintBufSize); - CHECK(iov_index_ < kIovSize); - uint32_t* ptr = uint_buf_ + uint_buf_index_; - uint_buf_[uint_buf_index_++] = value; - iov_[iov_index_].iov_base = ptr; - iov_[iov_index_].iov_len = sizeof(*ptr); - ++iov_index_; - return *this; - } - - SocketWriter& WriteString(const char* value) { - uint32_t valuelen = strlen(value); - WriteUint32(valuelen); - if (valuelen == 0) { - return *this; - } - - CHECK(iov_index_ < kIovSize); - iov_[iov_index_].iov_base = const_cast(value); - iov_[iov_index_].iov_len = valuelen; - ++iov_index_; - - return *this; - } - - bool Send() { - if (!connection_->IsValid()) { - return false; - } - - if (writev(connection_->socket(), iov_, iov_index_) == -1) { - connection_->last_error_ = errno; - return false; - } - - iov_index_ = uint_buf_index_ = 0; - return true; - } - - private: - static constexpr size_t kUintBufSize = 8; - static constexpr size_t kIovSize = 8; - - PropertyServiceConnection* connection_; - iovec iov_[kIovSize]; - size_t iov_index_; - uint32_t uint_buf_[kUintBufSize]; - size_t uint_buf_index_; - - DISALLOW_IMPLICIT_CONSTRUCTORS(SocketWriter); -}; - -struct prop_msg { - unsigned cmd; - char name[PROP_NAME_MAX]; - char value[PROP_VALUE_MAX]; -}; - -static int send_prop_msg(const prop_msg* msg) { - PropertyServiceConnection connection; - if (!connection.IsValid()) { - return connection.GetLastError(); - } - - int result = -1; - int s = connection.socket(); - - const int num_bytes = TEMP_FAILURE_RETRY(send(s, msg, sizeof(prop_msg), 0)); - if (num_bytes == sizeof(prop_msg)) { - // We successfully wrote to the property server but now we - // wait for the property server to finish its work. It - // acknowledges its completion by closing the socket so we - // poll here (on nothing), waiting for the socket to close. - // If you 'adb shell setprop foo bar' you'll see the POLLHUP - // once the socket closes. Out of paranoia we cap our poll - // at 250 ms. - pollfd pollfds[1]; - pollfds[0].fd = s; - pollfds[0].events = 0; - const int poll_result = TEMP_FAILURE_RETRY(poll(pollfds, 1, 250 /* ms */)); - if (poll_result == 1 && (pollfds[0].revents & POLLHUP) != 0) { - result = 0; - } else { - // Ignore the timeout and treat it like a success anyway. - // The init process is single-threaded and its property - // service is sometimes slow to respond (perhaps it's off - // starting a child process or something) and thus this - // times out and the caller thinks it failed, even though - // it's still getting around to it. So we fake it here, - // mostly for ctl.* properties, but we do try and wait 250 - // ms so callers who do read-after-write can reliably see - // what they've written. Most of the time. - // TODO: fix the system properties design. - async_safe_format_log(ANDROID_LOG_WARN, "libc", - "Property service has timed out while trying to set \"%s\" to \"%s\"", - msg->name, msg->value); - result = 0; - } - } - - return result; -} - -bool prop_area::foreach_property(prop_bt* const trie, - void (*propfn)(const prop_info* pi, void* cookie), void* cookie) { - if (!trie) return false; - - uint_least32_t left_offset = atomic_load_explicit(&trie->left, memory_order_relaxed); - if (left_offset != 0) { - const int err = foreach_property(to_prop_bt(&trie->left), propfn, cookie); - if (err < 0) return false; - } - uint_least32_t prop_offset = atomic_load_explicit(&trie->prop, memory_order_relaxed); - if (prop_offset != 0) { - prop_info* info = to_prop_info(&trie->prop); - if (!info) return false; - propfn(info, cookie); - } - uint_least32_t children_offset = atomic_load_explicit(&trie->children, memory_order_relaxed); - if (children_offset != 0) { - const int err = foreach_property(to_prop_bt(&trie->children), propfn, cookie); - if (err < 0) return false; - } - uint_least32_t right_offset = atomic_load_explicit(&trie->right, memory_order_relaxed); - if (right_offset != 0) { - const int err = foreach_property(to_prop_bt(&trie->right), propfn, cookie); - if (err < 0) return false; - } - - return true; -} - -const prop_info* prop_area::find(const char* name) { - return find_property(root_node(), name, strlen(name), nullptr, 0, false); -} - -bool prop_area::del(const char* name) { - return find_property_and_del(root_node(), name); -} - -bool prop_area::add(const char* name, unsigned int namelen, const char* value, - unsigned int valuelen) { - return find_property(root_node(), name, namelen, value, valuelen, true); -} - -bool prop_area::foreach (void (*propfn)(const prop_info* pi, void* cookie), void* cookie) { - return foreach_property(root_node(), propfn, cookie); -} - -class context_node { - public: - context_node(context_node* next, const char* context, prop_area* pa) - : next(next), context_(strdup(context)), pa_(pa), no_access_(false) { - lock_.init(false); - } - ~context_node() { - unmap(); - free(context_); - } - bool open(bool access_rw, bool* fsetxattr_failed); - bool check_access_and_open(); - void reset_access(); - - const char* context() const { - return context_; - } - prop_area* pa() { - return pa_; - } - - context_node* next; - - private: - bool check_access(); - void unmap(); - - Lock lock_; - char* context_; - prop_area* pa_; - bool no_access_; -}; - -struct prefix_node { - prefix_node(struct prefix_node* next, const char* prefix, context_node* context) - : prefix(strdup(prefix)), prefix_len(strlen(prefix)), context(context), next(next) { - } - ~prefix_node() { - free(prefix); - } - char* prefix; - const size_t prefix_len; - context_node* context; - struct prefix_node* next; -}; - -template -static inline void list_add(List** list, Args... args) { - *list = new List(*list, args...); -} - -static void list_add_after_len(prefix_node** list, const char* prefix, context_node* context) { - size_t prefix_len = strlen(prefix); - - auto next_list = list; - - while (*next_list) { - if ((*next_list)->prefix_len < prefix_len || (*next_list)->prefix[0] == '*') { - list_add(next_list, prefix, context); - return; - } - next_list = &(*next_list)->next; - } - list_add(next_list, prefix, context); -} - -template -static void list_foreach(List* list, Func func) { - while (list) { - func(list); - list = list->next; - } -} - -template -static List* list_find(List* list, Func func) { - while (list) { - if (func(list)) { - return list; - } - list = list->next; - } - return nullptr; -} - -template -static void list_free(List** list) { - while (*list) { - auto old_list = *list; - *list = old_list->next; - delete old_list; - } -} - -static prefix_node* prefixes = nullptr; -static context_node* contexts = nullptr; - -/* - * pthread_mutex_lock() calls into system_properties in the case of contention. - * This creates a risk of dead lock if any system_properties functions - * use pthread locks after system_property initialization. - * - * For this reason, the below three functions use a bionic Lock and static - * allocation of memory for each filename. - */ - -bool context_node::open(bool access_rw, bool* fsetxattr_failed) { - lock_.lock(); - if (pa_) { - lock_.unlock(); - return true; - } - - char filename[PROP_FILENAME_MAX]; - int len = async_safe_format_buffer(filename, sizeof(filename), "%s/%s", property_filename, - context_); - if (len < 0 || len > PROP_FILENAME_MAX) { - lock_.unlock(); - return false; - } - - if (access_rw) { - pa_ = map_prop_area_rw(filename, context_, fsetxattr_failed); - } else { - pa_ = map_prop_area(filename); - } - lock_.unlock(); - return pa_; -} - -bool context_node::check_access_and_open() { - if (!pa_ && !no_access_) { - if (!check_access() || !open(false, nullptr)) { - no_access_ = true; - } - } - return pa_; -} - -void context_node::reset_access() { - if (!check_access()) { - unmap(); - no_access_ = true; - } else { - no_access_ = false; - } -} - -bool context_node::check_access() { - char filename[PROP_FILENAME_MAX]; - int len = async_safe_format_buffer(filename, sizeof(filename), "%s/%s", property_filename, - context_); - if (len < 0 || len > PROP_FILENAME_MAX) { - return false; - } - - return access(filename, R_OK) == 0; -} - -void context_node::unmap() { - if (!pa_) { - return; - } - - munmap(pa_, pa_size); - if (pa_ == __system_property_area__) { - __system_property_area__ = nullptr; - } - pa_ = nullptr; -} - -static bool map_system_property_area(bool access_rw, bool* fsetxattr_failed) { - char filename[PROP_FILENAME_MAX]; - int len = - async_safe_format_buffer(filename, sizeof(filename), "%s/properties_serial", - property_filename); - if (len < 0 || len > PROP_FILENAME_MAX) { - __system_property_area__ = nullptr; - return false; - } - - if (access_rw) { - __system_property_area__ = - map_prop_area_rw(filename, "u:object_r:properties_serial:s0", fsetxattr_failed); - } else { - __system_property_area__ = map_prop_area(filename); - } - return __system_property_area__; -} - -static prop_area* get_prop_area_for_name(const char* name) { - auto entry = list_find(prefixes, [name](prefix_node* l) { - return l->prefix[0] == '*' || !strncmp(l->prefix, name, l->prefix_len); - }); - if (!entry) { - return nullptr; - } - - auto cnode = entry->context; - if (!cnode->pa()) { - /* - * We explicitly do not check no_access_ in this case because unlike the - * case of foreach(), we want to generate an selinux audit for each - * non-permitted property access in this function. - */ - cnode->open(false, nullptr); - } - return cnode->pa(); -} - -/* - * The below two functions are duplicated from label_support.c in libselinux. - * TODO: Find a location suitable for these functions such that both libc and - * libselinux can share a common source file. - */ - -/* - * The read_spec_entries and read_spec_entry functions may be used to - * replace sscanf to read entries from spec files. The file and - * property services now use these. - */ - -/* Read an entry from a spec file (e.g. file_contexts) */ -static inline int read_spec_entry(char** entry, char** ptr, int* len) { - *entry = nullptr; - char* tmp_buf = nullptr; - - while (isspace(**ptr) && **ptr != '\0') (*ptr)++; - - tmp_buf = *ptr; - *len = 0; - - while (!isspace(**ptr) && **ptr != '\0') { - (*ptr)++; - (*len)++; - } - - if (*len) { - *entry = strndup(tmp_buf, *len); - if (!*entry) return -1; - } - - return 0; -} - -/* - * line_buf - Buffer containing the spec entries . - * num_args - The number of spec parameter entries to process. - * ... - A 'char **spec_entry' for each parameter. - * returns - The number of items processed. - * - * This function calls read_spec_entry() to do the actual string processing. - */ -static int read_spec_entries(char* line_buf, int num_args, ...) { - char **spec_entry, *buf_p; - int len, rc, items, entry_len = 0; - va_list ap; - - len = strlen(line_buf); - if (line_buf[len - 1] == '\n') - line_buf[len - 1] = '\0'; - else - /* Handle case if line not \n terminated by bumping - * the len for the check below (as the line is NUL - * terminated by getline(3)) */ - len++; - - buf_p = line_buf; - while (isspace(*buf_p)) buf_p++; - - /* Skip comment lines and empty lines. */ - if (*buf_p == '#' || *buf_p == '\0') return 0; - - /* Process the spec file entries */ - va_start(ap, num_args); - - items = 0; - while (items < num_args) { - spec_entry = va_arg(ap, char**); - - if (len - 1 == buf_p - line_buf) { - va_end(ap); - return items; - } - - rc = read_spec_entry(spec_entry, &buf_p, &entry_len); - if (rc < 0) { - va_end(ap); - return rc; - } - if (entry_len) items++; - } - va_end(ap); - return items; -} - -static bool initialize_properties_from_file(const char* filename) { - FILE* file = fopen(filename, "re"); - if (!file) { - return false; - } - - char* buffer = nullptr; - size_t line_len; - char* prop_prefix = nullptr; - char* context = nullptr; - - while (getline(&buffer, &line_len, file) > 0) { - int items = read_spec_entries(buffer, 2, &prop_prefix, &context); - if (items <= 0) { - continue; - } - if (items == 1) { - free(prop_prefix); - continue; - } - /* - * init uses ctl.* properties as an IPC mechanism and does not write them - * to a property file, therefore we do not need to create property files - * to store them. - */ - if (!strncmp(prop_prefix, "ctl.", 4)) { - free(prop_prefix); - free(context); - continue; - } - - auto old_context = - list_find(contexts, [context](context_node* l) { return !strcmp(l->context(), context); }); - if (old_context) { - list_add_after_len(&prefixes, prop_prefix, old_context); - } else { - list_add(&contexts, context, nullptr); - list_add_after_len(&prefixes, prop_prefix, contexts); - } - free(prop_prefix); - free(context); - } - - free(buffer); - fclose(file); - - return true; -} - -static bool initialize_properties() { - // If we do find /property_contexts, then this is being - // run as part of the OTA updater on older release that had - // /property_contexts - b/34370523 - if (initialize_properties_from_file("/property_contexts")) { - return true; - } - - // Use property_contexts from /system & /vendor, fall back to those from / - if (access("/system/etc/selinux/plat_property_contexts", R_OK) != -1) { - if (!initialize_properties_from_file("/system/etc/selinux/plat_property_contexts")) { - return false; - } - // Don't check for failure here, so we always have a sane list of properties. - // E.g. In case of recovery, the vendor partition will not have mounted and we - // still need the system / platform properties to function. - initialize_properties_from_file("/vendor/etc/selinux/nonplat_property_contexts") || - initialize_properties_from_file("/vendor/etc/selinux/vendor_property_contexts"); - } else { - if (!initialize_properties_from_file("/plat_property_contexts")) { - return false; - } - initialize_properties_from_file("/nonplat_property_contexts"); - } - - return true; -} - -static bool is_dir(const char* pathname) { - struct stat info; - if (stat(pathname, &info) == -1) { - return false; - } - return S_ISDIR(info.st_mode); -} - -static void free_and_unmap_contexts() { - list_free(&prefixes); - list_free(&contexts); - if (__system_property_area__) { - munmap(__system_property_area__, pa_size); - __system_property_area__ = nullptr; - } -} - -int __system_properties_init() { - // This is called from __libc_init_common, and should leave errno at 0 (http://b/37248982). - // ErrnoRestorer errno_restorer; - - if (initialized) { - // list_foreach(contexts, [](context_node* l) { l->reset_access(); }); // resetprop remove - return 0; - } - if (is_dir(property_filename)) { - if (!initialize_properties()) { - return -1; - } - if (!map_system_property_area(false, nullptr)) { - free_and_unmap_contexts(); - return -1; - } - } else { - __system_property_area__ = map_prop_area(property_filename); - if (!__system_property_area__) { - return -1; - } - list_add(&contexts, "legacy_system_prop_area", __system_property_area__); - list_add_after_len(&prefixes, "*", contexts); - } - initialized = true; - return 0; -} - -int __system_property_set_filename(const char* filename) { - size_t len = strlen(filename); - if (len >= sizeof(property_filename)) return -1; - - strcpy(property_filename, filename); - return 0; -} - -int __system_property_area_init() { - free_and_unmap_contexts(); - mkdir(property_filename, S_IRWXU | S_IXGRP | S_IXOTH); - if (!initialize_properties()) { - return -1; - } - bool open_failed = false; - bool fsetxattr_failed = false; - list_foreach(contexts, [&fsetxattr_failed, &open_failed](context_node* l) { - if (!l->open(true, &fsetxattr_failed)) { - open_failed = true; - } - }); - if (open_failed || !map_system_property_area(true, &fsetxattr_failed)) { - free_and_unmap_contexts(); - return -1; - } - initialized = true; - return fsetxattr_failed ? -2 : 0; -} - -uint32_t __system_property_area_serial() { - prop_area* pa = __system_property_area__; - if (!pa) { - return -1; - } - // Make sure this read fulfilled before __system_property_serial - return atomic_load_explicit(pa->serial(), memory_order_acquire); -} - -const prop_info* __system_property_find(const char* name) { - if (!__system_property_area__) { - return nullptr; - } - - prop_area* pa = get_prop_area_for_name(name); - if (!pa) { - async_safe_format_log(ANDROID_LOG_ERROR, "libc", "Access denied finding property \"%s\"", name); - return nullptr; - } - - return pa->find(name); -} - -int __system_property_del(const char *name) { - if (!__system_property_area__) { - return 1; - } - - prop_area* pa = get_prop_area_for_name(name); - if (!pa) { - return 1; - } - - if (!pa->del(name)) - return 1; - - // We want to make sure that updates are visible to readers - atomic_store_explicit( - __system_property_area__->serial(), - atomic_load_explicit(__system_property_area__->serial(), memory_order_relaxed) + 1, - memory_order_release); - __futex_wake(__system_property_area__->serial(), INT32_MAX); - return 0; -} - -// The C11 standard doesn't allow atomic loads from const fields, -// though C++11 does. Fudge it until standards get straightened out. -static inline uint_least32_t load_const_atomic(const atomic_uint_least32_t* s, memory_order mo) { - atomic_uint_least32_t* non_const_s = const_cast(s); - return atomic_load_explicit(non_const_s, mo); -} - -int __system_property_read(const prop_info* pi, char* name, char* value) { - while (true) { - uint32_t serial = __system_property_serial(pi); // acquire semantics - size_t len = SERIAL_VALUE_LEN(serial); - memcpy(value, pi->value, len + 1); - // TODO: Fix the synchronization scheme here. - // There is no fully supported way to implement this kind - // of synchronization in C++11, since the memcpy races with - // updates to pi, and the data being accessed is not atomic. - // The following fence is unintuitive, but would be the - // correct one if memcpy used memory_order_relaxed atomic accesses. - // In practice it seems unlikely that the generated code would - // would be any different, so this should be OK. - atomic_thread_fence(memory_order_acquire); - if (serial == load_const_atomic(&(pi->serial), memory_order_relaxed)) { - if (name != nullptr) { - size_t namelen = strlcpy(name, pi->name, PROP_NAME_MAX); - if (namelen >= PROP_NAME_MAX) { - async_safe_format_log(ANDROID_LOG_ERROR, "libc", - "The property name length for \"%s\" is >= %d;" - " please use __system_property_read_callback" - " to read this property. (the name is truncated to \"%s\")", - pi->name, PROP_NAME_MAX - 1, name); - } - } - return len; - } - } -} - -void __system_property_read_callback(const prop_info* pi, - void (*callback)(void* cookie, - const char* name, - const char* value, - uint32_t serial), - void* cookie) { - while (true) { - uint32_t serial = __system_property_serial(pi); // acquire semantics - size_t len = SERIAL_VALUE_LEN(serial); - char value_buf[len + 1]; - - memcpy(value_buf, pi->value, len); - value_buf[len] = '\0'; - - // TODO: see todo in __system_property_read function - atomic_thread_fence(memory_order_acquire); - if (serial == load_const_atomic(&(pi->serial), memory_order_relaxed)) { - callback(cookie, pi->name, value_buf, serial); - return; - } - } -} - -int __system_property_get(const char* name, char* value) { - const prop_info* pi = __system_property_find(name); - - if (pi != 0) { - return __system_property_read(pi, nullptr, value); - } else { - value[0] = 0; - return 0; - } -} - -static constexpr uint32_t kProtocolVersion1 = 1; -static constexpr uint32_t kProtocolVersion2 = 2; // current - -static uint32_t g_propservice_protocol_version = 0; - -static void detect_protocol_version() { - char value[PROP_VALUE_MAX]; - if (__system_property_get(kServiceVersionPropertyName, value) == 0) { - g_propservice_protocol_version = kProtocolVersion1; - async_safe_format_log(ANDROID_LOG_WARN, "libc", - "Using old property service protocol (\"%s\" is not set)", - kServiceVersionPropertyName); - } else { - uint32_t version = static_cast(atoll(value)); - if (version >= kProtocolVersion2) { - g_propservice_protocol_version = kProtocolVersion2; - } else { - async_safe_format_log(ANDROID_LOG_WARN, "libc", - "Using old property service protocol (\"%s\"=\"%s\")", - kServiceVersionPropertyName, value); - g_propservice_protocol_version = kProtocolVersion1; - } - } -} - -int __system_property_set(const char* key, const char* value) { - if (key == nullptr) return -1; - if (value == nullptr) value = ""; - if (strlen(value) >= PROP_VALUE_MAX) return -1; - - if (g_propservice_protocol_version == 0) { - detect_protocol_version(); - } - - if (g_propservice_protocol_version == kProtocolVersion1) { - // Old protocol does not support long names - if (strlen(key) >= PROP_NAME_MAX) return -1; - - prop_msg msg; - memset(&msg, 0, sizeof msg); - msg.cmd = PROP_MSG_SETPROP; - strlcpy(msg.name, key, sizeof msg.name); - strlcpy(msg.value, value, sizeof msg.value); - - return send_prop_msg(&msg); - } else { - // Use proper protocol - PropertyServiceConnection connection; - if (!connection.IsValid()) { - errno = connection.GetLastError(); - async_safe_format_log(ANDROID_LOG_WARN, - "libc", - "Unable to set property \"%s\" to \"%s\": connection failed; errno=%d (%s)", - key, - value, - errno, - strerror(errno)); - return -1; - } - - SocketWriter writer(&connection); - if (!writer.WriteUint32(PROP_MSG_SETPROP2).WriteString(key).WriteString(value).Send()) { - errno = connection.GetLastError(); - async_safe_format_log(ANDROID_LOG_WARN, - "libc", - "Unable to set property \"%s\" to \"%s\": write failed; errno=%d (%s)", - key, - value, - errno, - strerror(errno)); - return -1; - } - - int result = -1; - if (!connection.RecvInt32(&result)) { - errno = connection.GetLastError(); - async_safe_format_log(ANDROID_LOG_WARN, - "libc", - "Unable to set property \"%s\" to \"%s\": recv failed; errno=%d (%s)", - key, - value, - errno, - strerror(errno)); - return -1; - } - - if (result != PROP_SUCCESS) { - async_safe_format_log(ANDROID_LOG_WARN, - "libc", - "Unable to set property \"%s\" to \"%s\": error code: 0x%x", - key, - value, - result); - return -1; - } - - return 0; - } -} - -int __system_property_update(prop_info* pi, const char* value, unsigned int len) { - if (len >= PROP_VALUE_MAX) { - return -1; - } - - prop_area* pa = __system_property_area__; - - if (!pa) { - return -1; - } - - uint32_t serial = atomic_load_explicit(&pi->serial, memory_order_relaxed); - serial |= 1; - atomic_store_explicit(&pi->serial, serial, memory_order_relaxed); - // The memcpy call here also races. Again pretend it - // used memory_order_relaxed atomics, and use the analogous - // counterintuitive fence. - atomic_thread_fence(memory_order_release); - strlcpy(pi->value, value, len + 1); - - atomic_store_explicit(&pi->serial, (len << 24) | ((serial + 1) & 0xffffff), memory_order_release); - __futex_wake(&pi->serial, INT32_MAX); - - atomic_store_explicit(pa->serial(), atomic_load_explicit(pa->serial(), memory_order_relaxed) + 1, - memory_order_release); - __futex_wake(pa->serial(), INT32_MAX); - - return 0; -} - -int __system_property_add(const char* name, unsigned int namelen, const char* value, - unsigned int valuelen) { - if (valuelen >= PROP_VALUE_MAX) { - return -1; - } - - if (namelen < 1) { - return -1; - } - - if (!__system_property_area__) { - return -1; - } - - prop_area* pa = get_prop_area_for_name(name); - - if (!pa) { - async_safe_format_log(ANDROID_LOG_ERROR, "libc", "Access denied adding property \"%s\"", name); - return -1; - } - - bool ret = pa->add(name, namelen, value, valuelen); - if (!ret) { - return -1; - } - - // There is only a single mutator, but we want to make sure that - // updates are visible to a reader waiting for the update. - atomic_store_explicit( - __system_property_area__->serial(), - atomic_load_explicit(__system_property_area__->serial(), memory_order_relaxed) + 1, - memory_order_release); - __futex_wake(__system_property_area__->serial(), INT32_MAX); - return 0; -} - -// Wait for non-locked serial, and retrieve it with acquire semantics. -uint32_t __system_property_serial(const prop_info* pi) { - uint32_t serial = load_const_atomic(&pi->serial, memory_order_acquire); - while (SERIAL_DIRTY(serial)) { - __futex_wait(const_cast(&pi->serial), serial, nullptr); - serial = load_const_atomic(&pi->serial, memory_order_acquire); - } - return serial; -} - -uint32_t __system_property_wait_any(uint32_t old_serial) { - uint32_t new_serial; - __system_property_wait(nullptr, old_serial, &new_serial, nullptr); - return new_serial; -} - -bool __system_property_wait(const prop_info* pi, - uint32_t old_serial, - uint32_t* new_serial_ptr, - const timespec* relative_timeout) { - // Are we waiting on the global serial or a specific serial? - atomic_uint_least32_t* serial_ptr; - if (pi == nullptr) { - if (__system_property_area__ == nullptr) return -1; - serial_ptr = __system_property_area__->serial(); - } else { - serial_ptr = const_cast(&pi->serial); - } - - uint32_t new_serial; - do { - int rc; - if ((rc = __futex_wait(serial_ptr, old_serial, relative_timeout)) != 0 && rc == -ETIMEDOUT) { - return false; - } - new_serial = load_const_atomic(serial_ptr, memory_order_acquire); - } while (new_serial == old_serial); - - *new_serial_ptr = new_serial; - return true; -} - -const prop_info* __system_property_find_nth(unsigned n) { - struct find_nth { - const uint32_t sought; - uint32_t current; - const prop_info* result; - - explicit find_nth(uint32_t n) : sought(n), current(0), result(nullptr) {} - static void fn(const prop_info* pi, void* ptr) { - find_nth* self = reinterpret_cast(ptr); - if (self->current++ == self->sought) self->result = pi; - } - } state(n); - __system_property_foreach(find_nth::fn, &state); - return state.result; -} - -int __system_property_foreach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) { - if (!__system_property_area__) { - return -1; - } - - list_foreach(contexts, [propfn, cookie](context_node* l) { - if (l->check_access_and_open()) { - l->pa()->foreach(propfn, cookie); - } - }); - return 0; -} diff --git a/native/jni/resetprop/system_property_api.cpp b/native/jni/resetprop/system_property_api.cpp new file mode 100644 index 000000000..15e9d36bf --- /dev/null +++ b/native/jni/resetprop/system_property_api.cpp @@ -0,0 +1,126 @@ +/* + * Copyright (C) 2017 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ +//#include +#include "private/_system_properties.h" + +#include +#include + +#include "private/bionic_defs.h" + +static SystemProperties system_properties; +static_assert(__is_trivially_constructible(SystemProperties), + "System Properties must be trivially constructable"); + +// This is public because it was exposed in the NDK. As of 2017-01, ~60 apps reference this symbol. +// It is set to nullptr and never modified. +__BIONIC_WEAK_VARIABLE_FOR_NATIVE_BRIDGE +prop_area* __system_property_area__ = nullptr; + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +int __system_properties_init() { + return system_properties.Init(PROP_FILENAME) ? 0 : -1; +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +int __system_property_set_filename(const char*) { + return -1; +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +int __system_property_area_init() { + bool fsetxattr_failed = false; + return system_properties.AreaInit(PROP_FILENAME, &fsetxattr_failed) && !fsetxattr_failed ? 0 : -1; +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +uint32_t __system_property_area_serial() { + return system_properties.AreaSerial(); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +const prop_info* __system_property_find(const char* name) { + return system_properties.Find(name); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +int __system_property_read(const prop_info* pi, char* name, char* value) { + return system_properties.Read(pi, name, value); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +void __system_property_read_callback(const prop_info* pi, + void (*callback)(void* cookie, const char* name, + const char* value, uint32_t serial), + void* cookie) { + return system_properties.ReadCallback(pi, callback, cookie); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +int __system_property_get(const char* name, char* value) { + return system_properties.Get(name, value); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +int __system_property_update(prop_info* pi, const char* value, unsigned int len) { + return system_properties.Update(pi, value, len); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +int __system_property_add(const char* name, unsigned int namelen, const char* value, + unsigned int valuelen) { + return system_properties.Add(name, namelen, value, valuelen); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +uint32_t __system_property_serial(const prop_info* pi) { + return system_properties.Serial(pi); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +uint32_t __system_property_wait_any(uint32_t old_serial) { + return system_properties.WaitAny(old_serial); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +bool __system_property_wait(const prop_info* pi, uint32_t old_serial, uint32_t* new_serial_ptr, + const timespec* relative_timeout) { + return system_properties.Wait(pi, old_serial, new_serial_ptr, relative_timeout); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +const prop_info* __system_property_find_nth(unsigned n) { + return system_properties.FindNth(n); +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +int __system_property_foreach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) { + return system_properties.Foreach(propfn, cookie); +} diff --git a/native/jni/resetprop/system_property_set.cpp b/native/jni/resetprop/system_property_set.cpp new file mode 100644 index 000000000..1523d96b4 --- /dev/null +++ b/native/jni/resetprop/system_property_set.cpp @@ -0,0 +1,317 @@ +/* + * Copyright (C) 2017 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ +//#include +#include "private/_system_properties.h" +#include + +#include + +#include "private/bionic_defs.h" +#include "private/bionic_macros.h" + +static const char property_service_socket[] = "/dev/socket/" PROP_SERVICE_NAME; +static const char* kServiceVersionPropertyName = "ro.property_service.version"; + +#define CHECK(x) /* NOP */ + +class PropertyServiceConnection { + public: + PropertyServiceConnection() : last_error_(0) { + socket_ = ::socket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0); + if (socket_ == -1) { + last_error_ = errno; + return; + } + + const size_t namelen = strlen(property_service_socket); + sockaddr_un addr; + memset(&addr, 0, sizeof(addr)); + strlcpy(addr.sun_path, property_service_socket, sizeof(addr.sun_path)); + addr.sun_family = AF_LOCAL; + socklen_t alen = namelen + offsetof(sockaddr_un, sun_path) + 1; + + if (TEMP_FAILURE_RETRY(connect(socket_, reinterpret_cast(&addr), alen)) == -1) { + last_error_ = errno; + close(socket_); + socket_ = -1; + } + } + + bool IsValid() { + return socket_ != -1; + } + + int GetLastError() { + return last_error_; + } + + bool RecvInt32(int32_t* value) { + int result = TEMP_FAILURE_RETRY(recv(socket_, value, sizeof(*value), MSG_WAITALL)); + return CheckSendRecvResult(result, sizeof(*value)); + } + + int socket() { + return socket_; + } + + ~PropertyServiceConnection() { + if (socket_ != -1) { + close(socket_); + } + } + + private: + bool CheckSendRecvResult(int result, int expected_len) { + if (result == -1) { + last_error_ = errno; + } else if (result != expected_len) { + last_error_ = -1; + } else { + last_error_ = 0; + } + + return last_error_ == 0; + } + + int socket_; + int last_error_; + + friend class SocketWriter; +}; + +class SocketWriter { + public: + explicit SocketWriter(PropertyServiceConnection* connection) + : connection_(connection), iov_index_(0), uint_buf_index_(0) { + } + + SocketWriter& WriteUint32(uint32_t value) { + CHECK(uint_buf_index_ < kUintBufSize); + CHECK(iov_index_ < kIovSize); + uint32_t* ptr = uint_buf_ + uint_buf_index_; + uint_buf_[uint_buf_index_++] = value; + iov_[iov_index_].iov_base = ptr; + iov_[iov_index_].iov_len = sizeof(*ptr); + ++iov_index_; + return *this; + } + + SocketWriter& WriteString(const char* value) { + uint32_t valuelen = strlen(value); + WriteUint32(valuelen); + if (valuelen == 0) { + return *this; + } + + CHECK(iov_index_ < kIovSize); + iov_[iov_index_].iov_base = const_cast(value); + iov_[iov_index_].iov_len = valuelen; + ++iov_index_; + + return *this; + } + + bool Send() { + if (!connection_->IsValid()) { + return false; + } + + if (writev(connection_->socket(), iov_, iov_index_) == -1) { + connection_->last_error_ = errno; + return false; + } + + iov_index_ = uint_buf_index_ = 0; + return true; + } + + private: + static constexpr size_t kUintBufSize = 8; + static constexpr size_t kIovSize = 8; + + PropertyServiceConnection* connection_; + iovec iov_[kIovSize]; + size_t iov_index_; + uint32_t uint_buf_[kUintBufSize]; + size_t uint_buf_index_; + + DISALLOW_IMPLICIT_CONSTRUCTORS(SocketWriter); +}; + +struct prop_msg { + unsigned cmd; + char name[PROP_NAME_MAX]; + char value[PROP_VALUE_MAX]; +}; + +static int send_prop_msg(const prop_msg* msg) { + PropertyServiceConnection connection; + if (!connection.IsValid()) { + return connection.GetLastError(); + } + + int result = -1; + int s = connection.socket(); + + const int num_bytes = TEMP_FAILURE_RETRY(send(s, msg, sizeof(prop_msg), 0)); + if (num_bytes == sizeof(prop_msg)) { + // We successfully wrote to the property server but now we + // wait for the property server to finish its work. It + // acknowledges its completion by closing the socket so we + // poll here (on nothing), waiting for the socket to close. + // If you 'adb shell setprop foo bar' you'll see the POLLHUP + // once the socket closes. Out of paranoia we cap our poll + // at 250 ms. + pollfd pollfds[1]; + pollfds[0].fd = s; + pollfds[0].events = 0; + const int poll_result = TEMP_FAILURE_RETRY(poll(pollfds, 1, 250 /* ms */)); + if (poll_result == 1 && (pollfds[0].revents & POLLHUP) != 0) { + result = 0; + } else { + // Ignore the timeout and treat it like a success anyway. + // The init process is single-threaded and its property + // service is sometimes slow to respond (perhaps it's off + // starting a child process or something) and thus this + // times out and the caller thinks it failed, even though + // it's still getting around to it. So we fake it here, + // mostly for ctl.* properties, but we do try and wait 250 + // ms so callers who do read-after-write can reliably see + // what they've written. Most of the time. + // TODO: fix the system properties design. + async_safe_format_log(ANDROID_LOG_WARN, "libc", + "Property service has timed out while trying to set \"%s\" to \"%s\"", + msg->name, msg->value); + result = 0; + } + } + + return result; +} + +static constexpr uint32_t kProtocolVersion1 = 1; +static constexpr uint32_t kProtocolVersion2 = 2; // current + +static atomic_uint_least32_t g_propservice_protocol_version = 0; + +static void detect_protocol_version() { + char value[PROP_VALUE_MAX]; + if (__system_property_get(kServiceVersionPropertyName, value) == 0) { + g_propservice_protocol_version = kProtocolVersion1; + async_safe_format_log(ANDROID_LOG_WARN, "libc", + "Using old property service protocol (\"%s\" is not set)", + kServiceVersionPropertyName); + } else { + uint32_t version = static_cast(atoll(value)); + if (version >= kProtocolVersion2) { + g_propservice_protocol_version = kProtocolVersion2; + } else { + async_safe_format_log(ANDROID_LOG_WARN, "libc", + "Using old property service protocol (\"%s\"=\"%s\")", + kServiceVersionPropertyName, value); + g_propservice_protocol_version = kProtocolVersion1; + } + } +} + +__BIONIC_WEAK_FOR_NATIVE_BRIDGE +int __system_property_set(const char* key, const char* value) { + if (key == nullptr) return -1; + if (value == nullptr) value = ""; + + if (g_propservice_protocol_version == 0) { + detect_protocol_version(); + } + + if (g_propservice_protocol_version == kProtocolVersion1) { + // Old protocol does not support long names or values + if (strlen(key) >= PROP_NAME_MAX) return -1; + if (strlen(value) >= PROP_VALUE_MAX) return -1; + + prop_msg msg; + memset(&msg, 0, sizeof msg); + msg.cmd = PROP_MSG_SETPROP; + strlcpy(msg.name, key, sizeof msg.name); + strlcpy(msg.value, value, sizeof msg.value); + + return send_prop_msg(&msg); + } else { + // New protocol only allows long values for ro. properties only. + if (strlen(value) >= PROP_VALUE_MAX && strncmp(key, "ro.", 3) != 0) return -1; + // Use proper protocol + PropertyServiceConnection connection; + if (!connection.IsValid()) { + errno = connection.GetLastError(); + async_safe_format_log( + ANDROID_LOG_WARN, "libc", + "Unable to set property \"%s\" to \"%s\": connection failed; errno=%d (%s)", key, value, + errno, strerror(errno)); + return -1; + } + + SocketWriter writer(&connection); + if (!writer.WriteUint32(PROP_MSG_SETPROP2).WriteString(key).WriteString(value).Send()) { + errno = connection.GetLastError(); + async_safe_format_log(ANDROID_LOG_WARN, "libc", + "Unable to set property \"%s\" to \"%s\": write failed; errno=%d (%s)", + key, value, errno, strerror(errno)); + return -1; + } + + int result = -1; + if (!connection.RecvInt32(&result)) { + errno = connection.GetLastError(); + async_safe_format_log(ANDROID_LOG_WARN, "libc", + "Unable to set property \"%s\" to \"%s\": recv failed; errno=%d (%s)", + key, value, errno, strerror(errno)); + return -1; + } + + if (result != PROP_SUCCESS) { + async_safe_format_log(ANDROID_LOG_WARN, "libc", + "Unable to set property \"%s\" to \"%s\": error code: 0x%x", key, value, + result); + return -1; + } + + return 0; + } +} diff --git a/native/jni/utils/misc.c b/native/jni/utils/misc.c index 11369197a..54e6fd2be 100644 --- a/native/jni/utils/misc.c +++ b/native/jni/utils/misc.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -85,80 +86,6 @@ int check_data() { return data; } -/* Original source: https://opensource.apple.com/source/cvs/cvs-19/cvs/lib/getline.c - * License: GPL 2 or later - * Adjusted to match POSIX */ -#define MIN_CHUNK 64 -ssize_t my_getdelim(char **lineptr, size_t *n, int delim, FILE *stream) { - size_t nchars_avail; - char *read_pos; - - if (!lineptr || !n || !stream) { - errno = EINVAL; - return -1; - } - - if (!*lineptr) { - *n = MIN_CHUNK; - *lineptr = malloc(*n); - if (!*lineptr) { - errno = ENOMEM; - return -1; - } - } - - nchars_avail = *n; - read_pos = *lineptr; - - while (1) { - int save_errno; - register int c = getc(stream); - - save_errno = errno; - - if (nchars_avail < 2) { - if (*n > MIN_CHUNK) - *n *= 2; - else - *n += MIN_CHUNK; - - nchars_avail = *n + *lineptr - read_pos; - *lineptr = realloc(*lineptr, *n); - if (!*lineptr) { - errno = ENOMEM; - return -1; - } - read_pos = *n - nchars_avail + *lineptr; - } - - if (ferror(stream)) { - errno = save_errno; - return -1; - } - - if (c == EOF) { - if (read_pos == *lineptr) - return -1; - else - break; - } - - *read_pos++ = c; - nchars_avail--; - - if (c == delim) - break; - } - - *read_pos = '\0'; - - return read_pos - *lineptr; -} - -ssize_t my_getline(char **lineptr, size_t *n, FILE *stream) { - return my_getdelim(lineptr, n, '\n', stream); -} - /* All the string should be freed manually!! */ int file_to_vector(const char* filename, struct vector *v) { if (access(filename, R_OK) != 0) @@ -468,3 +395,81 @@ int strend(const char *s1, const char *s2) { size_t l2 = strlen(s2); return strcmp(s1 + l1 - l2, s2); } + +/* Original source: https://opensource.apple.com/source/cvs/cvs-19/cvs/lib/getline.c + * License: GPL 2 or later + * Adjusted to match POSIX */ +#define MIN_CHUNK 64 +ssize_t __getdelim(char **lineptr, size_t *n, int delim, FILE *stream) { + size_t nchars_avail; + char *read_pos; + + if (!lineptr || !n || !stream) { + errno = EINVAL; + return -1; + } + + if (!*lineptr) { + *n = MIN_CHUNK; + *lineptr = malloc(*n); + if (!*lineptr) { + errno = ENOMEM; + return -1; + } + } + + nchars_avail = *n; + read_pos = *lineptr; + + while (1) { + int save_errno; + register int c = getc(stream); + + save_errno = errno; + + if (nchars_avail < 2) { + if (*n > MIN_CHUNK) + *n *= 2; + else + *n += MIN_CHUNK; + + nchars_avail = *n + *lineptr - read_pos; + *lineptr = realloc(*lineptr, *n); + if (!*lineptr) { + errno = ENOMEM; + return -1; + } + read_pos = *n - nchars_avail + *lineptr; + } + + if (ferror(stream)) { + errno = save_errno; + return -1; + } + + if (c == EOF) { + if (read_pos == *lineptr) + return -1; + else + break; + } + + *read_pos++ = c; + nchars_avail--; + + if (c == delim) + break; + } + + *read_pos = '\0'; + + return read_pos - *lineptr; +} + +ssize_t __getline(char **lineptr, size_t *n, FILE *stream) { + return __getdelim(lineptr, n, '\n', stream); +} + +int __fsetxattr(int fd, const char *name, const void *value, size_t size, int flags) { + return (int) syscall(__NR_fsetxattr, fd, name, value, size, flags); +}