mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 10:35:26 +00:00
311 lines
8.6 KiB
C++
311 lines
8.6 KiB
C++
#include <sys/mount.h>
|
|
#include <sys/sysmacros.h>
|
|
#include <libgen.h>
|
|
|
|
#include <utils.hpp>
|
|
#include <selinux.hpp>
|
|
#include <magisk.hpp>
|
|
|
|
#include "init.hpp"
|
|
|
|
using namespace std;
|
|
|
|
struct devinfo {
|
|
int major;
|
|
int minor;
|
|
char devname[32];
|
|
char partname[32];
|
|
char dmname[32];
|
|
};
|
|
|
|
static vector<devinfo> dev_list;
|
|
|
|
static void parse_device(devinfo *dev, const char *uevent) {
|
|
dev->partname[0] = '\0';
|
|
parse_prop_file(uevent, [=](string_view key, string_view value) -> bool {
|
|
if (key == "MAJOR")
|
|
dev->major = parse_int(value.data());
|
|
else if (key == "MINOR")
|
|
dev->minor = parse_int(value.data());
|
|
else if (key == "DEVNAME")
|
|
strcpy(dev->devname, value.data());
|
|
else if (key == "PARTNAME")
|
|
strcpy(dev->partname, value.data());
|
|
|
|
return true;
|
|
});
|
|
}
|
|
|
|
static void collect_devices() {
|
|
char path[128];
|
|
devinfo dev{};
|
|
if (auto dir = xopen_dir("/sys/dev/block"); dir) {
|
|
for (dirent *entry; (entry = readdir(dir.get()));) {
|
|
if (entry->d_name == "."sv || entry->d_name == ".."sv)
|
|
continue;
|
|
sprintf(path, "/sys/dev/block/%s/uevent", entry->d_name);
|
|
parse_device(&dev, path);
|
|
sprintf(path, "/sys/dev/block/%s/dm/name", entry->d_name);
|
|
if (access(path, F_OK) == 0) {
|
|
auto name = rtrim(full_read(path));
|
|
strcpy(dev.dmname, name.data());
|
|
}
|
|
dev_list.push_back(dev);
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct {
|
|
char partname[32];
|
|
char block_dev[64];
|
|
} blk_info;
|
|
|
|
static int64_t setup_block() {
|
|
if (dev_list.empty())
|
|
collect_devices();
|
|
|
|
for (int tries = 0; tries < 3; ++tries) {
|
|
for (auto &dev : dev_list) {
|
|
if (strcasecmp(dev.partname, blk_info.partname) == 0)
|
|
LOGD("Setup %s: [%s] (%d, %d)\n", dev.partname, dev.devname, dev.major, dev.minor);
|
|
else if (strcasecmp(dev.dmname, blk_info.partname) == 0)
|
|
LOGD("Setup %s: [%s] (%d, %d)\n", dev.dmname, dev.devname, dev.major, dev.minor);
|
|
else
|
|
continue;
|
|
|
|
dev_t rdev = makedev(dev.major, dev.minor);
|
|
xmknod(blk_info.block_dev, S_IFBLK | 0600, rdev);
|
|
return rdev;
|
|
}
|
|
// Wait 10ms and try again
|
|
usleep(10000);
|
|
dev_list.clear();
|
|
collect_devices();
|
|
}
|
|
|
|
// The requested partname does not exist
|
|
return -1;
|
|
}
|
|
|
|
static void switch_root(const string &path) {
|
|
LOGD("Switch root to %s\n", path.data());
|
|
int root = xopen("/", O_RDONLY);
|
|
vector<string> mounts;
|
|
parse_mnt("/proc/mounts", [&](mntent *me) {
|
|
// Skip root and self
|
|
if (me->mnt_dir == "/"sv || me->mnt_dir == path)
|
|
return true;
|
|
// Do not include subtrees
|
|
for (const auto &m : mounts) {
|
|
if (strncmp(me->mnt_dir, m.data(), m.length()) == 0 && me->mnt_dir[m.length()] == '/')
|
|
return true;
|
|
}
|
|
mounts.emplace_back(me->mnt_dir);
|
|
return true;
|
|
});
|
|
for (auto &dir : mounts) {
|
|
auto new_path = path + dir;
|
|
xmkdir(new_path.data(), 0755);
|
|
xmount(dir.data(), new_path.data(), nullptr, MS_MOVE, nullptr);
|
|
}
|
|
chdir(path.data());
|
|
xmount(path.data(), "/", nullptr, MS_MOVE, nullptr);
|
|
chroot(".");
|
|
|
|
LOGD("Cleaning rootfs\n");
|
|
frm_rf(root);
|
|
}
|
|
|
|
void MagiskInit::mount_rules_dir() {
|
|
char path[128];
|
|
xrealpath(BLOCKDIR, blk_info.block_dev);
|
|
xrealpath(MIRRDIR, path);
|
|
char *b = blk_info.block_dev + strlen(blk_info.block_dev);
|
|
char *p = path + strlen(path);
|
|
|
|
auto do_mount = [&](const char *type) -> bool {
|
|
xmkdir(path, 0755);
|
|
bool success = xmount(blk_info.block_dev, path, type, 0, nullptr) == 0;
|
|
if (success)
|
|
mount_list.emplace_back(path);
|
|
return success;
|
|
};
|
|
|
|
// First try userdata
|
|
strcpy(blk_info.partname, "userdata");
|
|
strcpy(b, "/data");
|
|
strcpy(p, "/data");
|
|
if (setup_block() < 0) {
|
|
// Try NVIDIA naming scheme
|
|
strcpy(blk_info.partname, "UDA");
|
|
if (setup_block() < 0)
|
|
goto cache;
|
|
}
|
|
// WARNING: DO NOT ATTEMPT TO MOUNT F2FS AS IT MAY CRASH THE KERNEL
|
|
// Failure means either f2fs, FDE, or metadata encryption
|
|
if (!do_mount("ext4"))
|
|
goto cache;
|
|
|
|
strcpy(p, "/data/unencrypted");
|
|
if (xaccess(path, F_OK) == 0) {
|
|
// FBE, need to use an unencrypted path
|
|
custom_rules_dir = path + "/magisk"s;
|
|
} else {
|
|
// Skip if /data/adb does not exist
|
|
strcpy(p, SECURE_DIR);
|
|
if (xaccess(path, F_OK) != 0)
|
|
return;
|
|
strcpy(p, MODULEROOT);
|
|
if (xaccess(path, F_OK) != 0) {
|
|
goto cache;
|
|
}
|
|
// Unencrypted, directly use module paths
|
|
custom_rules_dir = string(path);
|
|
}
|
|
goto success;
|
|
|
|
cache:
|
|
// Fallback to cache
|
|
strcpy(blk_info.partname, "cache");
|
|
strcpy(b, "/cache");
|
|
strcpy(p, "/cache");
|
|
if (setup_block() < 0) {
|
|
// Try NVIDIA naming scheme
|
|
strcpy(blk_info.partname, "CAC");
|
|
if (setup_block() < 0)
|
|
goto metadata;
|
|
}
|
|
if (!do_mount("ext4"))
|
|
goto metadata;
|
|
custom_rules_dir = path + "/magisk"s;
|
|
goto success;
|
|
|
|
metadata:
|
|
// Fallback to metadata
|
|
strcpy(blk_info.partname, "metadata");
|
|
strcpy(b, "/metadata");
|
|
strcpy(p, "/metadata");
|
|
if (setup_block() < 0 || !do_mount("ext4"))
|
|
goto persist;
|
|
custom_rules_dir = path + "/magisk"s;
|
|
goto success;
|
|
|
|
persist:
|
|
// Fallback to persist
|
|
strcpy(blk_info.partname, "persist");
|
|
strcpy(b, "/persist");
|
|
strcpy(p, "/persist");
|
|
if (setup_block() < 0 || !do_mount("ext4"))
|
|
return;
|
|
custom_rules_dir = path + "/magisk"s;
|
|
|
|
success:
|
|
// Create symlinks so we don't need to go through this logic again
|
|
strcpy(p, "/sepolicy.rules");
|
|
xsymlink(custom_rules_dir.data(), path);
|
|
}
|
|
|
|
bool LegacySARInit::mount_system_root() {
|
|
backup_files();
|
|
|
|
LOGD("Mounting system_root\n");
|
|
strcpy(blk_info.block_dev, "/dev/root");
|
|
|
|
do {
|
|
// Try legacy SAR dm-verity
|
|
strcpy(blk_info.partname, "vroot");
|
|
auto dev = setup_block();
|
|
if (dev >= 0)
|
|
goto mount_root;
|
|
|
|
// Try NVIDIA naming scheme
|
|
strcpy(blk_info.partname, "APP");
|
|
dev = setup_block();
|
|
if (dev >= 0)
|
|
goto mount_root;
|
|
|
|
sprintf(blk_info.partname, "system%s", config->slot);
|
|
dev = setup_block();
|
|
if (dev >= 0)
|
|
goto mount_root;
|
|
|
|
// Poll forever if rootwait was given in cmdline
|
|
} while (config->rootwait);
|
|
|
|
// We don't really know what to do at this point...
|
|
LOGE("Cannot find root partition, abort\n");
|
|
exit(1);
|
|
|
|
mount_root:
|
|
xmkdir("/system_root", 0755);
|
|
|
|
if (xmount("/dev/root", "/system_root", "ext4", MS_RDONLY, nullptr)) {
|
|
if (xmount("/dev/root", "/system_root", "erofs", MS_RDONLY, nullptr)) {
|
|
// We don't really know what to do at this point...
|
|
LOGE("Cannot mount root partition, abort\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
switch_root("/system_root");
|
|
|
|
// Use the apex folder to determine whether 2SI (Android 10+)
|
|
bool is_two_stage = access("/apex", F_OK) == 0;
|
|
LOGD("is_two_stage: [%d]\n", is_two_stage);
|
|
|
|
#if ENABLE_AVD_HACK
|
|
if (!is_two_stage) {
|
|
if (config->emulator) {
|
|
avd_hack = true;
|
|
// Make dev writable
|
|
xmkdir("/dev", 0755);
|
|
xmount("tmpfs", "/dev", "tmpfs", 0, "mode=755");
|
|
mount_list.emplace_back("/dev");
|
|
|
|
// These values are hardcoded for API 28 AVD
|
|
xmkdir("/dev/block", 0755);
|
|
strcpy(blk_info.block_dev, "/dev/block/vde1");
|
|
strcpy(blk_info.partname, "vendor");
|
|
setup_block();
|
|
xmount(blk_info.block_dev, "/vendor", "ext4", MS_RDONLY, nullptr);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return is_two_stage;
|
|
}
|
|
|
|
void BaseInit::exec_init() {
|
|
// Unmount in reverse order
|
|
for (auto &p : reversed(mount_list)) {
|
|
if (xumount2(p.data(), MNT_DETACH) == 0)
|
|
LOGD("Unmount [%s]\n", p.data());
|
|
}
|
|
execv("/init", argv);
|
|
exit(1);
|
|
}
|
|
|
|
void MagiskInit::setup_tmp(const char *path) {
|
|
LOGD("Setup Magisk tmp at %s\n", path);
|
|
xmount("tmpfs", path, "tmpfs", 0, "mode=755");
|
|
|
|
chdir(path);
|
|
|
|
xmkdir(INTLROOT, 0755);
|
|
xmkdir(MIRRDIR, 0);
|
|
xmkdir(BLOCKDIR, 0);
|
|
|
|
mount_rules_dir();
|
|
|
|
int fd = xopen(INTLROOT "/config", O_WRONLY | O_CREAT, 0);
|
|
xwrite(fd, magisk_cfg.buf, magisk_cfg.sz);
|
|
close(fd);
|
|
|
|
// Create applet symlinks
|
|
for (int i = 0; applet_names[i]; ++i)
|
|
xsymlink("./magisk", applet_names[i]);
|
|
xsymlink("./magiskpolicy", "supolicy");
|
|
|
|
chdir("/");
|
|
}
|