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Magisk
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Magisk/native/jni/core/bootstages.cpp

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#include <sys/mount.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <dirent.h>
#include <vector>
#include <string>
#include <magisk.hpp>
#include <db.hpp>
#include <utils.hpp>
#include <daemon.hpp>
#include <resetprop.hpp>
#include <selinux.hpp>
#include <flags.h>
using namespace std;
static char buf[PATH_MAX], buf2[PATH_MAX];
static vector<string> module_list;
static bool no_secure_dir = false;
static bool pfs_done = false;
static int bind_mount(const char *from, const char *to, bool log = true);
extern void auto_start_magiskhide();
/***************
* Magic Mount *
***************/
#ifdef MAGISK_DEBUG
#define VLOGI(tag, from, to) LOGI("%s: %s <- %s\n", tag, to, from)
#else
#define VLOGI(tag, from, to) LOGI("%s: %s\n", tag, to)
#endif
// Precedence: MODULE > SKEL > INTER > DUMMY
#define IS_DUMMY 0x01 /* mount from mirror */
#define IS_INTER 0x02 /* intermediate node */
#define IS_SKEL 0x04 /* replace with tmpfs */
#define IS_MODULE 0x08 /* mount from module */
#define IS_DIR(n) ((n)->type == DT_DIR)
#define IS_LNK(n) ((n)->type == DT_LNK)
#define IS_REG(n) ((n)->type == DT_REG)
class node_entry {
public:
explicit node_entry(const char *name, uint8_t type = DT_DIR, uint8_t status = IS_INTER)
: module(nullptr), name(name), type(type), status(status), parent(nullptr) {}
~node_entry();
void create_module_tree(const char *module);
void magic_mount();
node_entry *extract(const char *name);
static bool vendor_root;
static bool product_root;
private:
const char *module; /* Only used when IS_MODULE */
const string name;
uint8_t type;
uint8_t status;
node_entry *parent;
vector<node_entry *> children;
node_entry(node_entry *parent, const char *module, const char *name, uint8_t type)
: module(module), name(name), type(type), status(0), parent(parent) {}
bool is_special();
bool is_root();
string get_path();
void insert(node_entry *&);
void clone_skeleton();
int get_path(char *path);
};
bool node_entry::vendor_root = false;
bool node_entry::product_root = false;
node_entry::~node_entry() {
for (auto &node : children)
delete node;
}
#define SPECIAL_NODE (parent->parent ? false : \
((vendor_root && name == "vendor") || (product_root && name == "product")))
bool node_entry::is_special() {
return parent ? SPECIAL_NODE : false;
}
bool node_entry::is_root() {
return parent ? SPECIAL_NODE : true;
}
string node_entry::get_path() {
get_path(buf);
return buf;
}
int node_entry::get_path(char *path) {
int len = 0;
if (parent)
len = parent->get_path(path);
len += sprintf(path + len, "/%s", name.c_str());
return len;
}
void node_entry::insert(node_entry *&node) {
node->parent = this;
for (auto &child : children) {
if (child->name == node->name) {
if (node->status > child->status) {
// The new node has higher precedence
delete child;
child = node;
} else {
delete node;
node = child;
}
return;
}
}
children.push_back(node);
}
void node_entry::create_module_tree(const char *module) {
auto full_path = get_path();
snprintf(buf, PATH_MAX, "%s/%s%s", MODULEROOT, module, full_path.c_str());
auto dir = xopen_dir(buf);
if (!dir)
return;
// Check directory replace
if (faccessat(dirfd(dir.get()), ".replace", F_OK, 0) == 0) {
if (is_root()) {
// Root nodes should not be replaced
rm_rf(buf);
} else if (status < IS_MODULE) {
// Upgrade current node to current module
this->module = module;
status = IS_MODULE;
}
return;
}
for (dirent *entry; (entry = xreaddir(dir.get()));) {
if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue;
// Create new node
auto node = new node_entry(this, module, entry->d_name, entry->d_type);
// buf = real path, buf2 = module path
snprintf(buf, PATH_MAX, "%s/%s", full_path.c_str(), entry->d_name);
snprintf(buf2, PATH_MAX, MODULEROOT "/%s%s/%s", module, full_path.c_str(), entry->d_name);
/*
* Clone current directory in one of the following conditions:
* - Target does not exist
* - Module file is a symlink
* - Target file is a symlink (exclude special nodes)
*/
bool clone = false;
if (IS_LNK(node) || access(buf, F_OK) != 0) {
clone = true;
} else if (!node->is_special()) {
struct stat s;
xlstat(buf, &s);
if (S_ISLNK(s.st_mode))
clone = true;
}
if (clone && is_root()) {
// Root nodes should not be cloned
rm_rf(buf2);
delete node;
continue;
}
if (clone) {
// Mark self as a skeleton
status |= IS_SKEL; /* This will not overwrite if parent is module */
node->status = IS_MODULE;
} else if (node->is_special()) {
// Special nodes will be pulled out as root nodes later
node->status = IS_INTER;
} else {
// Clone attributes from real path
clone_attr(buf, buf2);
if (IS_DIR(node)) {
// First mark as an intermediate node
node->status = IS_INTER;
} else if (IS_REG(node)) {
// This is a file, mark as leaf
node->status = IS_MODULE;
}
}
insert(node);
if (IS_DIR(node)) {
// Recursive traverse through everything
node->create_module_tree(module);
}
}
}
void node_entry::clone_skeleton() {
// Clone the structure
auto full_path = get_path();
snprintf(buf, PATH_MAX, "%s%s", MIRRDIR, full_path.data());
if (auto dir = xopen_dir(buf); dir) {
for (dirent *entry; (entry = xreaddir(dir.get()));) {
if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue;
// Create dummy node
auto dummy = new node_entry(entry->d_name, entry->d_type, IS_DUMMY);
insert(dummy);
}
} else { return; }
if (status & IS_SKEL) {
file_attr attr;
getattr(full_path.c_str(), &attr);
LOGI("mnt_tmpfs : %s\n", full_path.c_str());
xmount("tmpfs", full_path.c_str(), "tmpfs", 0, nullptr);
setattr(full_path.c_str(), &attr);
}
for (auto &child : children) {
snprintf(buf, PATH_MAX, "%s/%s", full_path.c_str(), child->name.c_str());
// Create the dummy file/directory
if (IS_DIR(child))
xmkdir(buf, 0755);
else if (IS_REG(child))
close(creat(buf, 0644));
// Links will be handled later
if (child->status & IS_MODULE) {
// Mount from module file to dummy file
snprintf(buf2, PATH_MAX, "%s/%s%s/%s", MODULEMNT,
child->module, full_path.c_str(), child->name.c_str());
} else if (child->status & (IS_SKEL | IS_INTER)) {
// It's an intermediate folder, recursive clone
child->clone_skeleton();
continue;
} else if (child->status & IS_DUMMY) {
// Mount from mirror to dummy file
snprintf(buf2, PATH_MAX, "%s%s/%s", MIRRDIR, full_path.c_str(), child->name.c_str());
}
if (IS_LNK(child)) {
// Copy symlinks directly
cp_afc(buf2, buf);
VLOGI("copy_link ", buf2, buf);
} else {
snprintf(buf, PATH_MAX, "%s/%s", full_path.c_str(), child->name.c_str());
bind_mount(buf2, buf);
}
}
}
void node_entry::magic_mount() {
if (status & IS_MODULE) {
// Mount module item
auto real_path = get_path();
snprintf(buf, PATH_MAX, "%s/%s%s", MODULEMNT, module, real_path.c_str());
bind_mount(buf, real_path.c_str());
} else if (status & IS_SKEL) {
// The node is labeled to be cloned with skeleton, lets do it
clone_skeleton();
} else if (status & IS_INTER) {
// It's an intermediate node, travel deeper
for (auto &child : children)
child->magic_mount();
}
}
node_entry *node_entry::extract(const char *name) {
node_entry *node = nullptr;
// Extract the node out of the tree
for (auto it = children.begin(); it != children.end(); ++it) {
if ((*it)->name == name) {
node = *it;
node->parent = nullptr;
children.erase(it);
break;
}
}
return node;
}
/*****************
* Miscellaneous *
*****************/
static int bind_mount(const char *from, const char *to, bool log) {
int ret = xmount(from, to, nullptr, MS_BIND, nullptr);
if (log) VLOGI("bind_mount", from, to);
return ret;
}
#define MIRRMNT(part) MIRRDIR "/" #part
#define PARTBLK(part) BLOCKDIR "/" #part
#define DIR_IS(part) (me->mnt_dir == "/" #part ""sv)
#define mount_mirror(part, flag) { \
xstat(me->mnt_fsname, &st); \
mknod(PARTBLK(part), (st.st_mode & S_IFMT) | 0600, st.st_rdev); \
xmkdir(MIRRMNT(part), 0755); \
xmount(PARTBLK(part), MIRRMNT(part), me->mnt_type, flag, nullptr); \
VLOGI("mount", PARTBLK(part), MIRRMNT(part)); \
}
static bool magisk_env() {
LOGI("* Initializing Magisk environment\n");
string pkg;
check_manager(&pkg);
char install_dir[128];
sprintf(install_dir, "%s/0/%s/install", APP_DATA_DIR, pkg.data());
// Alternative binaries paths
const char *alt_bin[] = { "/cache/data_adb/magisk", "/data/magisk", install_dir };
for (auto alt : alt_bin) {
struct stat st;
if (lstat(alt, &st) != -1) {
if (S_ISLNK(st.st_mode)) {
unlink(alt);
continue;
}
rm_rf(DATABIN);;
cp_afc(alt, DATABIN);
rm_rf(alt);
break;
}
}
// Remove stuffs
rm_rf("/cache/data_adb");
rm_rf("/data/adb/modules/.core");
unlink("/data/magisk.img");
unlink("/data/magisk_debug.log");
// Directories in tmpfs overlay
xmkdir(MIRRDIR, 0);
xmkdir(BLOCKDIR, 0);
xmkdir(BBPATH, 0755);
xmkdir(MODULEMNT, 0755);
// Directories in /data/adb
xmkdir(DATABIN, 0755);
xmkdir(MODULEROOT, 0755);
xmkdir(SECURE_DIR "/post-fs-data.d", 0755);
xmkdir(SECURE_DIR "/service.d", 0755);
LOGI("* Mounting mirrors");
bool system_as_root = false;
struct stat st;
parse_mnt("/proc/mounts", [&](mntent *me) {
if (DIR_IS(system_root)) {
mount_mirror(system_root, MS_RDONLY);
xsymlink("./system_root/system", MIRRMNT(system));
VLOGI("link", MIRRMNT(system_root) "/system", MIRRMNT(system));
system_as_root = true;
} else if (!system_as_root && DIR_IS(system)) {
mount_mirror(system, MS_RDONLY);
} else if (DIR_IS(vendor)) {
mount_mirror(vendor, MS_RDONLY);
} else if (DIR_IS(product)) {
mount_mirror(product, MS_RDONLY);
} else if (DIR_IS(data) && me->mnt_type != "tmpfs"sv) {
mount_mirror(data, 0);
} else if (SDK_INT >= 24 && DIR_IS(proc) && !strstr(me->mnt_opts, "hidepid=2")) {
xmount(nullptr, "/proc", nullptr, MS_REMOUNT, "hidepid=2,gid=3009");
}
return true;
});
if (access(MIRRMNT(system), F_OK) != 0 && access(MIRRMNT(system_root), F_OK) == 0) {
// Pre-init mirrors
xsymlink("./system_root/system", MIRRMNT(system));
VLOGI("link", MIRRMNT(system_root) "/system", MIRRMNT(system));
}
if (access(MIRRMNT(vendor), F_OK) != 0) {
xsymlink("./system/vendor", MIRRMNT(vendor));
VLOGI("link", MIRRMNT(system) "/vendor", MIRRMNT(vendor));
}
if (access("/system/product", F_OK) == 0 && access(MIRRMNT(product), F_OK) != 0) {
xsymlink("./system/product", MIRRMNT(product));
VLOGI("link", MIRRMNT(system) "/product", MIRRMNT(product));
}
// Disable/remove magiskhide, resetprop
if (SDK_INT < 19) {
unlink("/sbin/resetprop");
unlink("/sbin/magiskhide");
}
if (access(DATABIN "/busybox", X_OK) == -1)
return false;
LOGI("* Setting up internal busybox");
cp_afc(DATABIN "/busybox", BBPATH "/busybox");
exec_command_sync(BBPATH "/busybox", "--install", "-s", BBPATH);
return true;
}
static void prepare_modules() {
// Upgrade modules
if (auto dir = open_dir(MODULEUPGRADE); dir) {
for (dirent *entry; (entry = xreaddir(dir.get()));) {
if (entry->d_type == DT_DIR) {
if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue;
// Cleanup old module if exists
snprintf(buf, sizeof(buf), "%s/%s", MODULEROOT, entry->d_name);
if (access(buf, F_OK) == 0)
rm_rf(buf);
LOGI("Upgrade / New module: %s\n", entry->d_name);
snprintf(buf2, sizeof(buf2), "%s/%s", MODULEUPGRADE, entry->d_name);
rename(buf2, buf);
}
}
rm_rf(MODULEUPGRADE);
}
bind_mount(MIRRDIR MODULEROOT, MODULEMNT, false);
restorecon();
chmod(SECURE_DIR, 0700);
}
static void reboot() {
if (RECOVERY_MODE)
exec_command_sync("/system/bin/reboot", "recovery");
else
exec_command_sync("/system/bin/reboot");
}
void remove_modules() {
LOGI("* Remove all modules and reboot");
auto dir = xopen_dir(MODULEROOT);
int dfd = dirfd(dir.get());
for (dirent *entry; (entry = xreaddir(dir.get()));) {
if (entry->d_type == DT_DIR) {
if (entry->d_name == "."sv || entry->d_name == ".."sv || entry->d_name == ".core"sv)
continue;
int modfd = xopenat(dfd, entry->d_name, O_RDONLY | O_CLOEXEC);
close(xopenat(modfd, "remove", O_RDONLY | O_CREAT | O_CLOEXEC));
close(modfd);
}
}
reboot();
}
static void collect_modules() {
auto dir = xopen_dir(MODULEROOT);
int dfd = dirfd(dir.get());
for (dirent *entry; (entry = xreaddir(dir.get()));) {
if (entry->d_type == DT_DIR) {
if (entry->d_name == "."sv || entry->d_name == ".."sv || entry->d_name == ".core"sv)
continue;
int modfd = xopenat(dfd, entry->d_name, O_RDONLY);
run_finally f([=]{ close(modfd); });
if (faccessat(modfd, "remove", F_OK, 0) == 0) {
LOGI("%s: remove\n", entry->d_name);
fd_pathat(modfd, "uninstall.sh", buf, sizeof(buf));
if (access(buf, F_OK) == 0)
exec_script(buf);
frm_rf(modfd);
unlinkat(dfd, entry->d_name, AT_REMOVEDIR);
continue;
}
unlinkat(modfd, "update", 0);
if (faccessat(modfd, "disable", F_OK, 0) != 0)
module_list.emplace_back(entry->d_name);
}
}
}
static bool load_modules(node_entry *root) {
LOGI("* Loading modules\n");
bool has_modules = false;
for (const auto &m : module_list) {
const auto module = m.data();
char *name = buf + snprintf(buf, sizeof(buf), MODULEROOT "/%s/", module);
// Read props
strcpy(name, "system.prop");
if (access(buf, F_OK) == 0) {
LOGI("%s: loading [system.prop]\n", module);
load_prop_file(buf, false);
}
// Copy sepolicy rules
strcpy(name, "sepolicy.rule");
if (access(MIRRDIR "/persist", F_OK) == 0 && access(buf, F_OK) == 0) {
char *p = buf2 + snprintf(buf2, sizeof(buf2), MIRRDIR "/persist/magisk/%s", module);
xmkdirs(buf2, 0755);
strcpy(p, "/sepolicy.rule");
cp_afc(buf, buf2);
}
// Check whether skip mounting
strcpy(name, "skip_mount");
if (access(buf, F_OK) == 0)
continue;
// Double check whether the system folder exists
strcpy(name, "system");
if (access(buf, F_OK) != 0)
continue;
// Construct structure
has_modules = true;
LOGI("%s: constructing magic mount structure\n", module);
// If /system/vendor exists in module, create a link outside
strcpy(name, "system/vendor");
if (node_entry::vendor_root && access(buf, F_OK) == 0) {
snprintf(buf2, sizeof(buf2), "%s/%s/vendor", MODULEROOT, module);
unlink(buf2);
xsymlink("./system/vendor", buf2);
}
// If /system/product exists in module, create a link outside
strcpy(name, "system/product");
if (node_entry::product_root && access(buf, F_OK) == 0) {
snprintf(buf2, sizeof(buf2), "%s/%s/product", MODULEROOT, module);
unlink(buf2);
xsymlink("./system/product", buf2);
}
root->create_module_tree(module);
}
return has_modules;
}
static bool check_data() {
bool mnt = false;
bool data = false;
file_readline("/proc/mounts", [&](string_view s) -> bool {
if (str_contains(s, " /data ") && !str_contains(s, "tmpfs"))
mnt = true;
return true;
});
if (mnt) {
auto crypto = getprop("ro.crypto.state");
if (!crypto.empty()) {
if (crypto == "unencrypted") {
// Unencrypted, we can directly access data
data = true;
} else {
// Encrypted, check whether vold is started
data = !getprop("init.svc.vold").empty();
}
} else {
// ro.crypto.state is not set, assume it's unencrypted
data = true;
}
}
return data;
}
void unlock_blocks() {
int fd, dev, OFF = 0;
auto dir = xopen_dir("/dev/block");
if (!dir)
return;
dev = dirfd(dir.get());
for (dirent *entry; (entry = readdir(dir.get()));) {
if (entry->d_type == DT_BLK) {
if ((fd = openat(dev, entry->d_name, O_RDONLY | O_CLOEXEC)) < 0)
continue;
if (ioctl(fd, BLKROSET, &OFF) < 0)
PLOGE("unlock %s", entry->d_name);
close(fd);
}
}
}
static bool log_dump = false;
static void dump_logs() {
if (log_dump)
return;
int test = exec_command_sync("/system/bin/logcat", "-d", "-f", "/dev/null");
chmod("/dev/null", 0666);
if (test != 0)
return;
rename(LOGFILE, LOGFILE ".bak");
log_dump = true;
// Start a daemon thread and wait indefinitely
new_daemon_thread([]() -> void {
int fd = xopen(LOGFILE, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC, 0644);
exec_t exec {
.fd = fd,
.fork = fork_no_zombie
};
int pid = exec_command(exec, "/system/bin/logcat", "-s", "Magisk");
close(fd);
if (pid < 0) {
log_dump = false;
} else {
waitpid(pid, nullptr, 0);
}
});
}
/****************
* Entry points *
****************/
[[noreturn]] static void unblock_boot_process() {
close(xopen(UNBLOCKFILE, O_RDONLY | O_CREAT, 0));
pthread_exit(nullptr);
}
[[noreturn]] static void core_only() {
pfs_done = true;
auto_start_magiskhide();
unblock_boot_process();
}
void post_fs_data(int client) {
// ack
write_int(client, 0);
close(client);
if (getenv("REMOUNT_ROOT"))
xmount(nullptr, "/", nullptr, MS_REMOUNT | MS_RDONLY, nullptr);
if (!check_data())
unblock_boot_process();
dump_logs();
LOGI("** post-fs-data mode running\n");
// Unlock all blocks for rw
unlock_blocks();
if (access(SECURE_DIR, F_OK) != 0) {
/* If the folder is not automatically created by the system,
* do NOT proceed further. Manual creation of the folder
* will cause bootloops on FBE devices. */
LOGE(SECURE_DIR " is not present, abort...");
no_secure_dir = true;
unblock_boot_process();
}
if (!magisk_env()) {
LOGE("* Magisk environment setup incomplete, abort\n");
unblock_boot_process();
}
LOGI("* Running post-fs-data.d scripts\n");
exec_common_script("post-fs-data");
prepare_modules();
// Core only mode
if (access(DISABLEFILE, F_OK) == 0)
core_only();
collect_modules();
// Execute module scripts
LOGI("* Running module post-fs-data scripts\n");
exec_module_script("post-fs-data", module_list);
// Recollect modules
module_list.clear();
collect_modules();
node_entry::vendor_root = access("/vendor", F_OK) == 0;
node_entry::product_root = access("/product", F_OK) == 0;
// Create the system root entry
auto sys_root = new node_entry("system");
if (load_modules(sys_root)) {
// Pull out special nodes if exist
node_entry *special;
if (node_entry::vendor_root && (special = sys_root->extract("vendor"))) {
special->magic_mount();
delete special;
}
if (node_entry::product_root && (special = sys_root->extract("product"))) {
special->magic_mount();
delete special;
}
sys_root->magic_mount();
}
// Cleanup memory
delete sys_root;
core_only();
}
void late_start(int client) {
LOGI("** late_start service mode running\n");
// ack
write_int(client, 0);
close(client);
dump_logs();
if (no_secure_dir) {
// It's safe to create the folder at this point if the system didn't create it
if (access(SECURE_DIR, F_OK) != 0)
xmkdir(SECURE_DIR, 0700);
// And reboot to make proper setup possible
reboot();
}
if (!pfs_done)
return;
if (access(BBPATH, F_OK) != 0){
LOGE("* post-fs-data mode is not triggered\n");
unlock_blocks();
magisk_env();
prepare_modules();
close(xopen(DISABLEFILE, O_RDONLY | O_CREAT | O_CLOEXEC, 0));
}
auto_start_magiskhide();
LOGI("* Running service.d scripts\n");
exec_common_script("service");
// Core only mode
if (access(DISABLEFILE, F_OK) != 0) {
LOGI("* Running module service scripts\n");
exec_module_script("service", module_list);
}
// All boot stage done, cleanup
module_list.clear();
module_list.shrink_to_fit();
}
void boot_complete(int client) {
LOGI("** boot_complete triggered\n");
// ack
write_int(client, 0);
close(client);
if (!pfs_done)
return;
auto_start_magiskhide();
if (access(MANAGERAPK, F_OK) == 0) {
// Install Magisk Manager if exists
rename(MANAGERAPK, "/data/magisk.apk");
install_apk("/data/magisk.apk");
} else {
// Check whether we have manager installed
if (!check_manager()) {
// Install stub
exec_command_sync("/sbin/magiskinit", "-x", "manager", "/data/magisk.apk");
install_apk("/data/magisk.apk");
}
}
}
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