mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-12-26 01:47:47 +00:00
1f8c063dc6
With Android 13 GKI kernels, the boot partition has no ramdisk, so Magisk constructs one from scratch. In this scenario, there's no backup init binary at /.backup/init. For normal boot, magiskinit will symlink /init -> /system/bin/init if needed. This commit implements the same for booting into recovery. Before, magiskinit would just exec itself over and over again because it couldn't restore the backup init. Signed-off-by: Andrew Gunnerson <chillermillerlong@hotmail.com>
136 lines
3.3 KiB
C++
136 lines
3.3 KiB
C++
#include <sys/stat.h>
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#include <sys/types.h>
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#include <libgen.h>
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#include <vector>
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#include <xz.h>
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#include <base.hpp>
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#include <binaries.h>
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#if defined(__arm__)
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#include <armeabi-v7a_binaries.h>
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#elif defined(__aarch64__)
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#include <arm64-v8a_binaries.h>
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#elif defined(__i386__)
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#include <x86_binaries.h>
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#elif defined(__x86_64__)
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#include <x86_64_binaries.h>
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#else
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#error Unsupported ABI
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#endif
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#include "init.hpp"
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#include <init-rs.cpp>
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using namespace std;
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bool unxz(int fd, const uint8_t *buf, size_t size) {
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uint8_t out[8192];
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xz_crc32_init();
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struct xz_dec *dec = xz_dec_init(XZ_DYNALLOC, 1 << 26);
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struct xz_buf b = {
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.in = buf,
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.in_pos = 0,
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.in_size = size,
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.out = out,
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.out_pos = 0,
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.out_size = sizeof(out)
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};
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enum xz_ret ret;
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do {
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ret = xz_dec_run(dec, &b);
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if (ret != XZ_OK && ret != XZ_STREAM_END)
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return false;
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write(fd, out, b.out_pos);
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b.out_pos = 0;
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} while (b.in_pos != size);
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return true;
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}
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static int dump_bin(const uint8_t *buf, size_t sz, const char *path, mode_t mode) {
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int fd = xopen(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, mode);
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if (fd < 0)
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return 1;
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if (!unxz(fd, buf, sz))
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return 1;
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close(fd);
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return 0;
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}
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void restore_ramdisk_init() {
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unlink("/init");
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const char *orig_init = backup_init();
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if (access(orig_init, F_OK) == 0) {
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xrename(orig_init, "/init");
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} else {
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// If the backup init is missing, this means that the boot ramdisk
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// was created from scratch, and the real init is in a separate CPIO,
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// which is guaranteed to be placed at /system/bin/init.
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xsymlink(INIT_PATH, "/init");
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}
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}
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int dump_manager(const char *path, mode_t mode) {
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return dump_bin(manager_xz, sizeof(manager_xz), path, mode);
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}
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int dump_preload(const char *path, mode_t mode) {
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return dump_bin(preload_xz, sizeof(preload_xz), path, mode);
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}
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class RecoveryInit : public BaseInit {
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public:
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using BaseInit::BaseInit;
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void start() override {
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LOGD("Ramdisk is recovery, abort\n");
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restore_ramdisk_init();
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rm_rf("/.backup");
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exec_init();
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}
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};
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int main(int argc, char *argv[]) {
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umask(0);
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auto name = basename(argv[0]);
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if (name == "magisk"sv)
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return magisk_proxy_main(argc, argv);
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if (argc > 1 && argv[1] == "-x"sv) {
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if (argc > 2 && argv[2] == "manager"sv)
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return dump_manager(argv[3], 0644);
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return 1;
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}
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if (getpid() != 1)
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return 1;
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BaseInit *init;
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BootConfig config{};
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if (argc > 1 && argv[1] == "selinux_setup"sv) {
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init = new SecondStageInit(argv);
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} else {
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// This will also mount /sys and /proc
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load_kernel_info(&config);
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if (config.skip_initramfs)
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init = new LegacySARInit(argv, &config);
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else if (config.force_normal_boot)
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init = new FirstStageInit(argv, &config);
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else if (access("/sbin/recovery", F_OK) == 0 || access("/system/bin/recovery", F_OK) == 0)
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init = new RecoveryInit(argv, &config);
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else if (check_two_stage())
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init = new FirstStageInit(argv, &config);
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else
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init = new RootFSInit(argv, &config);
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}
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// Run the main routine
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init->start();
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exit(1);
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}
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