2018-11-01 18:23:12 +01:00
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/* proc_monitor.cpp - Monitor am_proc_start events and unmount
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2017-08-01 09:34:16 +02:00
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*
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2017-07-10 17:39:33 +02:00
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* We monitor the logcat am_proc_start events. When a target starts up,
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* we pause it ASAP, and fork a new process to join its mount namespace
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* and do all the unmounting/mocking
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2017-04-06 00:12:29 +02:00
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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2018-07-13 16:14:32 +02:00
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#include <fcntl.h>
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2017-04-06 00:12:29 +02:00
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#include <signal.h>
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#include <pthread.h>
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#include <sys/types.h>
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2017-04-09 01:25:10 +02:00
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#include <sys/wait.h>
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2017-07-10 17:39:33 +02:00
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#include <sys/mount.h>
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2019-01-20 05:59:37 +01:00
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#include <vector>
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#include <string>
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2017-04-06 00:12:29 +02:00
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2019-02-10 07:05:19 +01:00
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#include <magisk.h>
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#include <utils.h>
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#include <logcat.h>
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2016-12-30 19:44:24 +01:00
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#include "magiskhide.h"
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2019-01-20 05:59:37 +01:00
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using namespace std;
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2019-02-12 08:14:57 +01:00
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extern char *system_block, *vendor_block, *data_block;
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2017-04-07 01:50:02 +02:00
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2017-04-06 00:12:29 +02:00
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// Workaround for the lack of pthread_cancel
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2018-11-01 18:23:12 +01:00
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static void term_thread(int) {
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2017-04-09 01:25:10 +02:00
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LOGD("proc_monitor: running cleanup\n");
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2019-02-10 07:05:19 +01:00
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stop_logging(HIDE_EVENT);
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2019-01-20 05:59:37 +01:00
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hide_list.clear();
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2018-11-16 06:37:41 +01:00
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hide_enabled = false;
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2018-11-01 18:23:12 +01:00
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pthread_mutex_destroy(&list_lock);
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LOGD("proc_monitor: terminating\n");
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2018-11-07 08:10:38 +01:00
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pthread_exit(nullptr);
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2017-04-06 00:12:29 +02:00
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}
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2017-01-01 11:54:13 +01:00
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2018-07-11 17:41:38 +02:00
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static int read_ns(const int pid, struct stat *st) {
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2017-07-02 19:02:11 +02:00
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char path[32];
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2018-06-19 19:20:49 +02:00
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sprintf(path, "/proc/%d/ns/mnt", pid);
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2018-07-11 17:41:38 +02:00
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return stat(path, st);
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2017-07-02 19:02:11 +02:00
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}
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2018-11-23 20:32:33 +01:00
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static inline void lazy_unmount(const char* mountpoint) {
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2018-01-11 17:23:38 +01:00
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if (umount2(mountpoint, MNT_DETACH) != -1)
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2017-07-10 17:39:33 +02:00
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LOGD("hide_daemon: Unmounted (%s)\n", mountpoint);
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}
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2018-06-19 19:20:49 +02:00
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static int parse_ppid(int pid) {
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2018-11-23 20:32:33 +01:00
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char path[32];
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int ppid;
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2018-06-19 19:20:49 +02:00
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sprintf(path, "/proc/%d/stat", pid);
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2018-11-24 21:53:15 +01:00
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FILE *stat = fopen(path, "re");
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2018-11-23 20:32:33 +01:00
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if (stat == nullptr)
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2018-11-13 08:11:02 +01:00
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return -1;
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2018-06-19 19:20:49 +02:00
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/* PID COMM STATE PPID ..... */
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2018-11-23 20:32:33 +01:00
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fscanf(stat, "%*d %*s %*c %d", &ppid);
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2018-11-24 03:15:44 +01:00
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fclose(stat);
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2018-06-19 19:20:49 +02:00
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return ppid;
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}
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2018-04-29 09:10:35 +02:00
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static void hide_daemon(int pid) {
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2018-11-23 21:47:49 +01:00
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LOGD("hide_daemon: handling pid=[%d]\n", pid);
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2017-07-10 17:39:33 +02:00
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2018-11-23 20:32:33 +01:00
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char buffer[4096];
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2019-01-20 05:59:37 +01:00
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vector<string> mounts;
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2017-07-10 17:39:33 +02:00
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manage_selinux();
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2017-07-18 06:26:23 +02:00
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clean_magisk_props();
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2017-07-10 17:39:33 +02:00
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if (switch_mnt_ns(pid))
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2017-10-08 23:05:52 +02:00
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goto exit;
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2017-07-10 17:39:33 +02:00
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2018-11-13 08:07:02 +01:00
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snprintf(buffer, sizeof(buffer), "/proc/%d", pid);
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chdir(buffer);
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2017-07-10 17:39:33 +02:00
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2019-01-20 05:59:37 +01:00
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mounts = file_to_vector("mounts");
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2018-06-16 23:16:52 +02:00
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// Unmount dummy skeletons and /sbin links
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2018-11-01 18:23:12 +01:00
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for (auto &s : mounts) {
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2019-01-20 05:59:37 +01:00
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if (str_contains(s, "tmpfs /system/") || str_contains(s, "tmpfs /vendor/") ||
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str_contains(s, "tmpfs /sbin")) {
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sscanf(s.c_str(), "%*s %4096s", buffer);
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2017-07-10 17:39:33 +02:00
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lazy_unmount(buffer);
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}
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}
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// Re-read mount infos
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2019-01-20 05:59:37 +01:00
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mounts = file_to_vector("mounts");
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2017-07-10 17:39:33 +02:00
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2019-02-12 08:14:57 +01:00
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// Unmount everything under /system, /vendor, and data mounts
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2018-11-01 18:23:12 +01:00
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for (auto &s : mounts) {
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2019-01-20 05:59:37 +01:00
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if ((str_contains(s, " /system/") || str_contains(s, " /vendor/")) &&
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2019-02-12 08:14:57 +01:00
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(str_contains(s, system_block) || str_contains(s, vendor_block) || str_contains(s, data_block))) {
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2019-01-20 05:59:37 +01:00
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sscanf(s.c_str(), "%*s %4096s", buffer);
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2017-07-10 17:39:33 +02:00
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lazy_unmount(buffer);
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}
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}
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2017-10-08 23:05:52 +02:00
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exit:
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// Send resume signal
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kill(pid, SIGCONT);
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_exit(0);
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2017-07-10 17:39:33 +02:00
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}
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2017-04-21 18:54:08 +02:00
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void proc_monitor() {
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2017-11-14 22:15:58 +01:00
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// Unblock user signals
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sigset_t block_set;
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sigemptyset(&block_set);
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sigaddset(&block_set, TERM_THREAD);
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2019-01-20 05:59:37 +01:00
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pthread_sigmask(SIG_UNBLOCK, &block_set, nullptr);
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2017-11-14 22:15:58 +01:00
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2017-04-06 00:12:29 +02:00
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// Register the cancel signal
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2019-01-20 05:59:37 +01:00
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struct sigaction act{};
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2017-11-08 20:05:01 +01:00
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act.sa_handler = term_thread;
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2019-01-20 05:59:37 +01:00
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sigaction(TERM_THREAD, &act, nullptr);
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2017-05-07 21:11:14 +02:00
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2018-06-19 19:20:49 +02:00
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if (access("/proc/1/ns/mnt", F_OK) != 0) {
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2017-07-10 17:39:33 +02:00
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LOGE("proc_monitor: Your kernel doesn't support mount namespace :(\n");
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2017-11-08 20:05:01 +01:00
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term_thread(TERM_THREAD);
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2017-07-10 17:39:33 +02:00
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}
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2017-03-25 11:21:48 +01:00
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2019-02-10 07:05:19 +01:00
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auto &queue = start_logging(HIDE_EVENT);
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while (true) {
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2018-11-23 21:47:49 +01:00
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char *log;
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int pid, ppid;
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2018-10-12 06:50:47 +02:00
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struct stat ns, pns;
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2019-02-10 07:05:19 +01:00
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string line = queue.take();
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if ((log = strchr(&line[0], '[')) == nullptr)
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2018-11-23 21:47:49 +01:00
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continue;
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// Extract pid
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if (sscanf(log, "[%*d,%d", &pid) != 1)
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continue;
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2017-12-18 11:17:37 +01:00
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2018-11-23 21:47:49 +01:00
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// Extract last token (component name)
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const char *tok, *cpnt = "";
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while ((tok = strtok_r(nullptr, ",[]\n", &log)))
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cpnt = tok;
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if (cpnt[0] == '\0')
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2018-10-12 06:50:47 +02:00
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continue;
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// Make sure our target is alive
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2018-11-23 20:32:33 +01:00
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if ((ppid = parse_ppid(pid)) < 0 || read_ns(ppid, &pns))
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2018-10-12 06:50:47 +02:00
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continue;
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2018-11-01 18:23:12 +01:00
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bool hide = false;
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pthread_mutex_lock(&list_lock);
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for (auto &s : hide_list) {
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2019-01-20 05:59:37 +01:00
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if (strncmp(cpnt, s.c_str(), s.size() - 1) == 0) {
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2018-11-01 18:23:12 +01:00
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hide = true;
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2018-10-12 06:50:47 +02:00
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break;
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2018-07-03 19:52:23 +02:00
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}
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2018-10-12 06:50:47 +02:00
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}
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2018-11-01 18:23:12 +01:00
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pthread_mutex_unlock(&list_lock);
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2018-11-13 08:11:02 +01:00
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2018-11-23 20:32:33 +01:00
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if (!hide)
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2018-10-12 06:50:47 +02:00
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continue;
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2018-11-23 20:32:33 +01:00
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while (read_ns(pid, &ns) == 0 && ns.st_dev == pns.st_dev && ns.st_ino == pns.st_ino)
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usleep(500);
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2018-10-12 06:50:47 +02:00
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// Send pause signal ASAP
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if (kill(pid, SIGSTOP) == -1)
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continue;
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/*
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* The setns system call do not support multithread processes
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* We have to fork a new process, setns, then do the unmounts
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*/
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2018-11-23 21:47:49 +01:00
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LOGI("proc_monitor: %s PID=[%d] ns=[%llu]\n", cpnt, pid, ns.st_ino);
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2018-10-12 06:50:47 +02:00
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if (fork_dont_care() == 0)
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hide_daemon(pid);
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2017-06-02 22:31:01 +02:00
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}
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2017-03-24 20:45:12 +01:00
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}
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