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Magisk/native/jni/core/bootstages.cpp
topjohnwu 25c557248c Use ContentProvider call method for communication 
Previously, we use either BroadcastReceivers or Activities to receive
messages from our native daemon, but both have their own downsides.
Some OEMs blocks broadcasts if the app is not running in the background,
regardless of who the caller is. Activities on the other hand, despite
working 100% of the time, will steal the focus of the current foreground
app, even though we are just doing some logging and showing a toast.
In addition, since stubs for hiding Magisk Manager is introduced, our
only communication method is left with the broadcast option, as
only broadcasting allows targeting a specific package name, not a
component name (which will be obfuscated in the case of stubs).

To make sure root requests will work on all devices, Magisk had to do
some experiments every boot to test whether broadcast is deliverable or
not. This makes the whole thing even more complicated then ever.

So lets take a look at another kind of component in Android apps:
ContentProviders. It is a vital part of Android's ecosystem, and as far
as I know no OEMs will block requests to ContentProviders (or else
tons of functionality will break catastrophically). Starting at API 11,
the system supports calling a specific method in ContentProviders,
optionally sending extra data along with the method call. This is
perfect for the native daemon to start a communication with Magisk
Manager. Another cool thing is that we no longer need to know the
component name of the reciever, as ContentProviders identify themselves
with an "authority" name, which in Magisk Manager's case is tied to the
package name. We already have a mechanism to keep track of our current
manager package name, so this works out of the box.

So yay! No more flaky broadcast tests, no more stupid OEMs blocking
broadcasts for some bizzare reasons. This method should in theory
work on almost all devices and situations.
2019-11-04 14:32:28 -05:00

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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.h>
#include <db.h>
#include <utils.h>
#include <daemon.h>
#include <resetprop.h>
#include <selinux.h>
#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());
unique_ptr<DIR, decltype(&closedir)> dir(xopendir(buf), closedir);
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 (struct 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() {
DIR *dir;
struct dirent *entry;
// Clone the structure
auto full_path = get_path();
snprintf(buf, PATH_MAX, "%s%s", MIRRDIR, full_path.c_str());
if (!(dir = xopendir(buf)))
return;
while ((entry = xreaddir(dir))) {
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);
}
closedir(dir);
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");
// Alternative binaries paths
constexpr const char *alt_bin[] = {
"/cache/data_adb/magisk", "/data/magisk",
"/data/data/com.topjohnwu.magisk/install",
"/data/user_de/0/com.topjohnwu.magisk/install"
};
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");
unlink("/data/magisk.img");
unlink("/data/magisk_debug.log");
// Backwards compatibility
symlink("./.magisk", "/sbin/.core");
symlink("./modules", MAGISKTMP "/img");
// 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, and modules
if (SDK_INT < 19) {
close(xopen(DISABLEFILE, O_RDONLY | O_CREAT | O_CLOEXEC, 0));
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() {
const char *legacy_imgs[] = {SECURE_DIR "/magisk.img", SECURE_DIR "/magisk_merge.img"};
for (auto img : legacy_imgs) {
if (access(img, F_OK) == 0)
migrate_img(img);
}
DIR *dir;
struct dirent *entry;
if ((dir = opendir(MODULEUPGRADE))) {
while ((entry = xreaddir(dir))) {
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);
}
}
closedir(dir);
rm_rf(MODULEUPGRADE);
}
bind_mount(MIRRDIR MODULEROOT, MODULEMNT, false);
// Legacy support
xmkdir(LEGACYCORE, 0755);
symlink(SECURE_DIR "/post-fs-data.d", LEGACYCORE "/post-fs-data.d");
symlink(SECURE_DIR "/service.d", LEGACYCORE "/service.d");
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");
chdir(MODULEROOT);
rm_rf("lost+found");
DIR *dir = xopendir(".");
struct dirent *entry;
while ((entry = xreaddir(dir))) {
if (entry->d_type == DT_DIR) {
if (entry->d_name == "."sv || entry->d_name == ".."sv || entry->d_name == ".core"sv)
continue;
chdir(entry->d_name);
close(creat("remove", 0644));
chdir("..");
}
}
closedir(dir);
chdir("/");
reboot();
}
static void collect_modules() {
chdir(MODULEROOT);
rm_rf("lost+found");
DIR *dir = xopendir(".");
struct dirent *entry;
while ((entry = xreaddir(dir))) {
if (entry->d_type == DT_DIR) {
if (entry->d_name == "."sv || entry->d_name == ".."sv || entry->d_name == ".core"sv)
continue;
chdir(entry->d_name);
if (access("remove", F_OK) == 0) {
chdir("..");
LOGI("%s: remove\n", entry->d_name);
sprintf(buf, "%s/uninstall.sh", entry->d_name);
if (access(buf, F_OK) == 0)
exec_script(buf);
rm_rf(entry->d_name);
continue;
}
unlink("update");
if (access("disable", F_OK))
module_list.emplace_back(entry->d_name);
chdir("..");
}
}
closedir(dir);
chdir("/");
}
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.c_str();
// Read props
snprintf(buf, PATH_MAX, "%s/%s/system.prop", MODULEROOT, module);
if (access(buf, F_OK) == 0) {
LOGI("%s: loading [system.prop]\n", module);
load_prop_file(buf, false);
}
// Check whether skip mounting
snprintf(buf, PATH_MAX, "%s/%s/skip_mount", MODULEROOT, module);
if (access(buf, F_OK) == 0)
continue;
// Double check whether the system folder exists
snprintf(buf, PATH_MAX, "%s/%s/system", MODULEROOT, module);
if (access(buf, F_OK) == -1)
continue;
// Construct structure
has_modules = true;
LOGI("%s: constructing magic mount structure\n", module);
// If /system/vendor exists in module, create a link outside
snprintf(buf, PATH_MAX, "%s/%s/system/vendor", MODULEROOT, module);
if (node_entry::vendor_root && access(buf, F_OK) == 0) {
snprintf(buf2, PATH_MAX, "%s/%s/vendor", MODULEROOT, module);
unlink(buf2);
xsymlink("./system/vendor", buf2);
}
// If /system/product exists in module, create a link outside
snprintf(buf, PATH_MAX, "%s/%s/system/product", MODULEROOT, module);
if (node_entry::product_root && access(buf, F_OK) == 0) {
snprintf(buf2, PATH_MAX, "%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() {
DIR *dir;
struct dirent *entry;
int fd, dev, OFF = 0;
if (!(dir = xopendir("/dev/block")))
return;
dev = dirfd(dir);
while((entry = readdir(dir))) {
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);
}
}
closedir(dir);
}
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 0
// Increment boot count
int boot_count = 0;
FILE *cf = fopen(BOOTCOUNT, "r");
if (cf) {
fscanf(cf, "%d", &boot_count);
fclose(cf);
}
boot_count++;
if (boot_count > 2)
creat(DISABLEFILE, 0644);
cf = xfopen(BOOTCOUNT, "w");
fprintf(cf, "%d", boot_count);
fclose(cf);
#endif
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();
// Run scripts after full patch, most reliable way to run scripts
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 a valid manager installed
db_strings str;
get_db_strings(str, SU_MANAGER);
if (validate_manager(str[SU_MANAGER], 0, nullptr)) {
// There is no manager installed, install the stub
exec_command_sync("/sbin/magiskinit", "-x", "manager", "/data/magisk.apk");
install_apk("/data/magisk.apk");
}
}
}
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