Separate magiskinit components
This commit is contained in:
topjohnwu
parent
5d357bc41f
commit
845d1e02b0
@ -80,7 +80,10 @@ LOCAL_C_INCLUDES := \
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$(LIBUTILS)
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LOCAL_SRC_FILES := \
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core/init.cpp \
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init/init.cpp \
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init/early_mount.cpp \
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init/rootfs.cpp \
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init/getinfo.cpp \
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magiskpolicy/api.cpp \
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magiskpolicy/magiskpolicy.cpp \
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magiskpolicy/rules.cpp \
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@ -1,749 +0,0 @@
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <sys/sendfile.h>
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#include <sys/sysmacros.h>
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#include <linux/input.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <functional>
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#include <string_view>
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#include <xz.h>
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#include <magisk.h>
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#include <magiskpolicy.h>
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#include <selinux.h>
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#include <cpio.h>
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#include <utils.h>
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#include <flags.h>
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#include "binaries.h"
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#ifdef USE_64BIT
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#include "binaries_arch64.h"
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#define LIBNAME "lib64"
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#else
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#include "binaries_arch.h"
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#define LIBNAME "lib"
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#endif
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#include "magiskrc.h"
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using namespace std;
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#define DEFAULT_DT_DIR "/proc/device-tree/firmware/android"
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#ifdef MAGISK_DEBUG
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static FILE *kmsg;
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static int vprintk(const char *fmt, va_list ap) {
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fprintf(kmsg, "magiskinit: ");
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return vfprintf(kmsg, fmt, ap);
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}
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static void setup_klog() {
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mknod("/kmsg", S_IFCHR | 0666, makedev(1, 11));
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int fd = xopen("/kmsg", O_WRONLY | O_CLOEXEC);
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kmsg = fdopen(fd, "w");
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setbuf(kmsg, nullptr);
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unlink("/kmsg");
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log_cb.d = log_cb.i = log_cb.w = log_cb.e = vprintk;
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log_cb.ex = nop_ex;
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}
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#else
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#define setup_klog(...)
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#endif
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static int test_main(int argc, char *argv[]);
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constexpr const char *init_applet[] =
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{ "magiskpolicy", "supolicy", "init_test", nullptr };
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constexpr int (*init_applet_main[])(int, char *[]) =
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{ magiskpolicy_main, magiskpolicy_main, test_main, nullptr };
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struct cmdline {
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bool system_as_root;
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char slot[3];
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char dt_dir[128];
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};
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struct raw_data {
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void *buf;
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size_t sz;
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};
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static 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 void decompress_ramdisk() {
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constexpr char tmp[] = "tmp.cpio";
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constexpr char ramdisk_xz[] = "ramdisk.cpio.xz";
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if (access(ramdisk_xz, F_OK))
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return;
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LOGD("Decompressing ramdisk from %s\n", ramdisk_xz);
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uint8_t *buf;
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size_t sz;
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mmap_ro(ramdisk_xz, buf, sz);
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int fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC);
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unxz(fd, buf, sz);
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munmap(buf, sz);
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close(fd);
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cpio_mmap cpio(tmp);
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cpio.extract();
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unlink(tmp);
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unlink(ramdisk_xz);
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}
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static int dump_magisk(const char *path, mode_t mode) {
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int fd = open(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, magisk_xz, sizeof(magisk_xz)))
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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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static int dump_manager(const char *path, mode_t mode) {
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int fd = open(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, manager_xz, sizeof(manager_xz)))
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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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class MagiskInit {
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private:
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cmdline cmd{};
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raw_data self{};
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raw_data config{};
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int root = -1;
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char **argv;
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bool load_sepol = false;
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bool mnt_system = false;
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bool mnt_vendor = false;
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bool mnt_product = false;
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bool mnt_odm = false;
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void load_kernel_info();
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void preset();
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void early_mount();
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void setup_rootfs();
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bool read_dt_fstab(const char *name, char *partname, char *partfs);
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bool patch_sepolicy();
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void cleanup();
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void re_exec_init();
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public:
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explicit MagiskInit(char *argv[]) : argv(argv) {}
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void start();
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void test();
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};
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static inline void parse_cmdline(const std::function<void (std::string_view, const char *)> &fn) {
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char cmdline[4096];
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int fd = open("/proc/cmdline", O_RDONLY | O_CLOEXEC);
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cmdline[read(fd, cmdline, sizeof(cmdline))] = '\0';
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close(fd);
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char *tok, *eql, *tmp, *saveptr;
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saveptr = cmdline;
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while ((tok = strtok_r(nullptr, " \n", &saveptr)) != nullptr) {
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eql = strchr(tok, '=');
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if (eql) {
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*eql = '\0';
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if (eql[1] == '"') {
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tmp = strchr(saveptr, '"');
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if (tmp != nullptr) {
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*tmp = '\0';
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saveptr[-1] = ' ';
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saveptr = tmp + 1;
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eql++;
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}
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}
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fn(tok, eql + 1);
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} else {
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fn(tok, "");
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}
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}
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}
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#define test_bit(bit, array) (array[bit / 8] & (1 << (bit % 8)))
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static bool check_key_combo() {
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uint8_t bitmask[(KEY_MAX + 1) / 8];
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vector<int> events;
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constexpr const char *name = "/event";
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for (int minor = 64; minor < 96; ++minor) {
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if (mknod(name, S_IFCHR | 0444, makedev(13, minor))) {
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PLOGE("mknod");
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continue;
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}
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int fd = open(name, O_RDONLY | O_CLOEXEC);
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unlink(name);
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if (fd < 0)
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continue;
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memset(bitmask, 0, sizeof(bitmask));
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ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(bitmask)), bitmask);
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if (test_bit(KEY_VOLUMEUP, bitmask))
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events.push_back(fd);
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}
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if (events.empty())
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return false;
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RunFinally fin([&]() -> void {
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for (const int &fd : events)
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close(fd);
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});
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// Return true if volume key up is hold for more than 3 seconds
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int count = 0;
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for (int i = 0; i < 500; ++i) {
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for (const int &fd : events) {
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memset(bitmask, 0, sizeof(bitmask));
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ioctl(fd, EVIOCGKEY(sizeof(bitmask)), bitmask);
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if (test_bit(KEY_VOLUMEUP, bitmask)) {
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count++;
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break;
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}
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}
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if (count >= 300) {
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LOGD("KEY_VOLUMEUP detected: disable system-as-root\n");
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return true;
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}
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// Check every 10ms
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usleep(10000);
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}
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return false;
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}
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void MagiskInit::load_kernel_info() {
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// Communicate with kernel using procfs and sysfs
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xmkdir("/proc", 0755);
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xmount("proc", "/proc", "proc", 0, nullptr);
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xmkdir("/sys", 0755);
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xmount("sysfs", "/sys", "sysfs", 0, nullptr);
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bool enter_recovery = false;
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bool kirin = false;
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bool recovery_mode = false;
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parse_cmdline([&](auto key, auto value) -> void {
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LOGD("cmdline: [%s]=[%s]\n", key.data(), value);
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if (key == "androidboot.slot_suffix") {
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strcpy(cmd.slot, value);
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} else if (key == "androidboot.slot") {
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cmd.slot[0] = '_';
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strcpy(cmd.slot + 1, value);
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} else if (key == "skip_initramfs") {
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cmd.system_as_root = true;
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} else if (key == "androidboot.android_dt_dir") {
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strcpy(cmd.dt_dir, value);
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} else if (key == "enter_recovery") {
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enter_recovery = value[0] == '1';
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} else if (key == "androidboot.hardware") {
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kirin = strstr(value, "kirin") || strstr(value, "hi3660") || strstr(value, "hi6250");
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}
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});
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parse_prop_file("/.backup/.magisk", [&](auto key, auto value) -> bool {
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if (key == "RECOVERYMODE" && value == "true")
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recovery_mode = true;
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return true;
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});
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if (kirin && enter_recovery) {
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// Inform that we are actually booting as recovery
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if (!recovery_mode) {
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if (FILE *f = fopen("/.backup/.magisk", "ae"); f) {
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fprintf(f, "RECOVERYMODE=true\n");
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fclose(f);
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}
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recovery_mode = true;
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}
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}
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if (recovery_mode) {
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LOGD("Running in recovery mode, waiting for key...\n");
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cmd.system_as_root = !check_key_combo();
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}
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if (cmd.dt_dir[0] == '\0')
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strcpy(cmd.dt_dir, DEFAULT_DT_DIR);
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LOGD("system_as_root=[%d]\n", cmd.system_as_root);
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LOGD("slot=[%s]\n", cmd.slot);
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LOGD("dt_dir=[%s]\n", cmd.dt_dir);
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}
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void MagiskInit::preset() {
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root = open("/", O_RDONLY | O_CLOEXEC);
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if (cmd.system_as_root) {
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// Clear rootfs
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LOGD("Cleaning rootfs\n");
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frm_rf(root, { "overlay", "proc", "sys" });
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} else {
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decompress_ramdisk();
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// Revert original init binary
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rename("/.backup/init", "/init");
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rm_rf("/.backup");
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// Do not go further if device is booting into recovery
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if (access("/sbin/recovery", F_OK) == 0) {
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LOGD("Ramdisk is recovery, abort\n");
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re_exec_init();
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}
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}
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}
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struct device {
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int major;
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int minor;
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char devname[32];
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char partname[32];
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};
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static inline void parse_device(device *dev, const char *uevent) {
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dev->partname[0] = '\0';
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FILE *fp = xfopen(uevent, "re");
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char buf[64];
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while (fgets(buf, sizeof(buf), fp)) {
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if (strncmp(buf, "MAJOR", 5) == 0) {
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sscanf(buf, "MAJOR=%d", &dev->major);
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} else if (strncmp(buf, "MINOR", 5) == 0) {
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sscanf(buf, "MINOR=%d", &dev->minor);
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} else if (strncmp(buf, "DEVNAME", 7) == 0) {
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sscanf(buf, "DEVNAME=%s", dev->devname);
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} else if (strncmp(buf, "PARTNAME", 8) == 0) {
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sscanf(buf, "PARTNAME=%s", dev->partname);
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}
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}
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fclose(fp);
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}
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static vector<device> dev_list;
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static void collect_devices() {
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char path[128];
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struct dirent *entry;
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device dev;
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DIR *dir = xopendir("/sys/dev/block");
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if (dir == nullptr)
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return;
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while ((entry = readdir(dir))) {
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if (entry->d_name == "."sv || entry->d_name == ".."sv)
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continue;
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sprintf(path, "/sys/dev/block/%s/uevent", entry->d_name);
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parse_device(&dev, path);
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dev_list.push_back(dev);
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}
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closedir(dir);
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}
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static bool setup_block(const char *partname, char *block_dev) {
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if (dev_list.empty())
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collect_devices();
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for (auto &dev : dev_list) {
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if (strcasecmp(dev.partname, partname) == 0) {
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sprintf(block_dev, "/dev/block/%s", dev.devname);
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LOGD("Found %s: [%s] (%d, %d)\n", dev.partname, dev.devname, dev.major, dev.minor);
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xmkdir("/dev", 0755);
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xmkdir("/dev/block", 0755);
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mknod(block_dev, S_IFBLK | 0600, makedev(dev.major, dev.minor));
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return true;
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}
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}
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return false;
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}
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bool MagiskInit::read_dt_fstab(const char *name, char *partname, char *partfs) {
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char path[128];
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int fd;
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sprintf(path, "%s/fstab/%s/dev", cmd.dt_dir, name);
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if ((fd = xopen(path, O_RDONLY | O_CLOEXEC)) >= 0) {
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read(fd, path, sizeof(path));
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close(fd);
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// Some custom treble use different names, so use what we read
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char *part = rtrim(strrchr(path, '/') + 1);
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sprintf(partname, "%s%s", part, strend(part, cmd.slot) ? cmd.slot : "");
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sprintf(path, "%s/fstab/%s/type", cmd.dt_dir, name);
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if ((fd = xopen(path, O_RDONLY | O_CLOEXEC)) >= 0) {
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read(fd, partfs, 32);
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close(fd);
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return true;
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}
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}
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return false;
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}
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static inline bool is_lnk(const char *name) {
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struct stat st;
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if (lstat(name, &st))
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return false;
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return S_ISLNK(st.st_mode);
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}
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#define link_root(name) \
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if (is_lnk("/system_root" name)) \
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cp_afc("/system_root" name, name)
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#define mount_root(name) \
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if (!is_lnk("/" #name) && read_dt_fstab(#name, partname, fstype)) { \
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LOGD("Early mount " #name "\n"); \
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setup_block(partname, block_dev); \
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xmkdir("/" #name, 0755); \
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xmount(block_dev, "/" #name, fstype, MS_RDONLY, nullptr); \
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mnt_##name = true; \
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}
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void MagiskInit::early_mount() {
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char partname[32];
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char fstype[32];
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char block_dev[64];
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if (cmd.system_as_root) {
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LOGD("Early mount system_root\n");
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sprintf(partname, "system%s", cmd.slot);
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setup_block(partname, block_dev);
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xmkdir("/system_root", 0755);
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xmount(block_dev, "/system_root", "ext4", MS_RDONLY, nullptr);
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xmkdir("/system", 0755);
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xmount("/system_root/system", "/system", nullptr, MS_BIND, nullptr);
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// Android Q
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if (is_lnk("/system_root/init"))
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load_sepol = true;
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// System-as-root with monolithic sepolicy
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if (access("/system_root/sepolicy", F_OK) == 0)
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cp_afc("/system_root/sepolicy", "/sepolicy");
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// Copy if these partitions are symlinks
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link_root("/vendor");
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link_root("/product");
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link_root("/odm");
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} else {
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mount_root(system);
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}
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mount_root(vendor);
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mount_root(product);
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mount_root(odm);
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}
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static void patch_socket_name(const char *path) {
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uint8_t *buf;
|
||||
char name[sizeof(MAIN_SOCKET)];
|
||||
size_t size;
|
||||
mmap_rw(path, buf, size);
|
||||
for (int i = 0; i < size; ++i) {
|
||||
if (memcmp(buf + i, MAIN_SOCKET, sizeof(MAIN_SOCKET)) == 0) {
|
||||
gen_rand_str(name, sizeof(name));
|
||||
memcpy(buf + i, name, sizeof(name));
|
||||
i += sizeof(name);
|
||||
}
|
||||
}
|
||||
munmap(buf, size);
|
||||
}
|
||||
|
||||
constexpr const char wrapper[] =
|
||||
"#!/system/bin/sh\n"
|
||||
"export LD_LIBRARY_PATH=\"$LD_LIBRARY_PATH:/apex/com.android.runtime/" LIBNAME "\"\n"
|
||||
"exec /sbin/magisk.bin \"$0\" \"$@\"\n"
|
||||
;
|
||||
|
||||
void MagiskInit::setup_rootfs() {
|
||||
bool patch_init = patch_sepolicy();
|
||||
|
||||
if (cmd.system_as_root) {
|
||||
// Clone rootfs
|
||||
LOGD("Clone root dir from system to rootfs\n");
|
||||
int system_root = xopen("/system_root", O_RDONLY | O_CLOEXEC);
|
||||
clone_dir(system_root, root, false);
|
||||
close(system_root);
|
||||
}
|
||||
|
||||
if (patch_init) {
|
||||
constexpr char SYSTEM_INIT[] = "/system/bin/init";
|
||||
// If init is symlink, copy it to rootfs so we can patch
|
||||
if (is_lnk("/init"))
|
||||
cp_afc(SYSTEM_INIT, "/init");
|
||||
|
||||
char *addr;
|
||||
size_t size;
|
||||
mmap_rw("/init", addr, size);
|
||||
for (char *p = addr; p < addr + size; ++p) {
|
||||
if (memcmp(p, SPLIT_PLAT_CIL, sizeof(SPLIT_PLAT_CIL)) == 0) {
|
||||
// Force init to load /sepolicy
|
||||
LOGD("Remove from init: " SPLIT_PLAT_CIL "\n");
|
||||
memset(p, 'x', sizeof(SPLIT_PLAT_CIL) - 1);
|
||||
p += sizeof(SPLIT_PLAT_CIL) - 1;
|
||||
} else if (memcmp(p, SYSTEM_INIT, sizeof(SYSTEM_INIT)) == 0) {
|
||||
// Force execute /init instead of /system/bin/init
|
||||
LOGD("Patch init: [/system/bin/init] -> [/init]\n");
|
||||
strcpy(p, "/init");
|
||||
p += sizeof(SYSTEM_INIT) - 1;
|
||||
}
|
||||
}
|
||||
munmap(addr, size);
|
||||
}
|
||||
|
||||
// Handle ramdisk overlays
|
||||
int fd = open("/overlay", O_RDONLY | O_CLOEXEC);
|
||||
if (fd >= 0) {
|
||||
LOGD("Merge overlay folder\n");
|
||||
mv_dir(fd, root);
|
||||
close(fd);
|
||||
rmdir("/overlay");
|
||||
}
|
||||
|
||||
// Patch init.rc
|
||||
FILE *rc = xfopen("/init.p.rc", "we");
|
||||
file_readline("/init.rc", [&](auto line) -> bool {
|
||||
// Do not start vaultkeeper
|
||||
if (str_contains(line, "start vaultkeeper")) {
|
||||
LOGD("Remove vaultkeeper\n");
|
||||
return true;
|
||||
}
|
||||
// Do not run flash_recovery
|
||||
if (str_starts(line, "service flash_recovery")) {
|
||||
LOGD("Remove flash_recovery\n");
|
||||
fprintf(rc, "service flash_recovery /system/bin/xxxxx\n");
|
||||
return true;
|
||||
}
|
||||
// Else just write the line
|
||||
fprintf(rc, "%s", line.data());
|
||||
return true;
|
||||
});
|
||||
char pfd_svc[8], ls_svc[8], bc_svc[8];
|
||||
// Make sure to be unique
|
||||
pfd_svc[0] = 'a';
|
||||
ls_svc[0] = '0';
|
||||
bc_svc[0] = 'A';
|
||||
gen_rand_str(pfd_svc + 1, sizeof(pfd_svc) - 1);
|
||||
gen_rand_str(ls_svc + 1, sizeof(ls_svc) - 1);
|
||||
gen_rand_str(bc_svc + 1, sizeof(bc_svc) - 1);
|
||||
LOGD("Inject magisk services: [%s] [%s] [%s]\n", pfd_svc, ls_svc, bc_svc);
|
||||
fprintf(rc, magiskrc, pfd_svc, pfd_svc, ls_svc, bc_svc, bc_svc);
|
||||
fclose(rc);
|
||||
clone_attr("/init.rc", "/init.p.rc");
|
||||
rename("/init.p.rc", "/init.rc");
|
||||
|
||||
// Don't let init run in init yet
|
||||
lsetfilecon("/init", "u:object_r:rootfs:s0");
|
||||
|
||||
// Create hardlink mirror of /sbin to /root
|
||||
mkdir("/root", 0750);
|
||||
clone_attr("/sbin", "/root");
|
||||
int rootdir = xopen("/root", O_RDONLY | O_CLOEXEC);
|
||||
int sbin = xopen("/sbin", O_RDONLY | O_CLOEXEC);
|
||||
link_dir(sbin, rootdir);
|
||||
close(sbin);
|
||||
|
||||
LOGD("Mount /sbin tmpfs overlay\n");
|
||||
xmount("tmpfs", "/sbin", "tmpfs", 0, "mode=755");
|
||||
sbin = xopen("/sbin", O_RDONLY | O_CLOEXEC);
|
||||
|
||||
char path[64];
|
||||
|
||||
// Create symlinks pointing back to /root
|
||||
DIR *dir = xfdopendir(rootdir);
|
||||
struct dirent *entry;
|
||||
while((entry = xreaddir(dir))) {
|
||||
if (entry->d_name == "."sv || entry->d_name == ".."sv)
|
||||
continue;
|
||||
sprintf(path, "/root/%s", entry->d_name);
|
||||
xsymlinkat(path, sbin, entry->d_name);
|
||||
}
|
||||
|
||||
// Dump binaries
|
||||
mkdir(MAGISKTMP, 0755);
|
||||
fd = xopen(MAGISKTMP "/config", O_WRONLY | O_CREAT, 0000);
|
||||
write(fd, config.buf, config.sz);
|
||||
close(fd);
|
||||
fd = xopen("/sbin/magiskinit", O_WRONLY | O_CREAT, 0755);
|
||||
write(fd, self.buf, self.sz);
|
||||
close(fd);
|
||||
if (access("/system/apex", F_OK) == 0) {
|
||||
LOGD("APEX detected, use wrapper\n");
|
||||
dump_magisk("/sbin/magisk.bin", 0755);
|
||||
patch_socket_name("/sbin/magisk.bin");
|
||||
fd = xopen("/sbin/magisk", O_WRONLY | O_CREAT, 0755);
|
||||
write(fd, wrapper, sizeof(wrapper) - 1);
|
||||
close(fd);
|
||||
} else {
|
||||
dump_magisk("/sbin/magisk", 0755);
|
||||
patch_socket_name("/sbin/magisk");
|
||||
}
|
||||
|
||||
// Create applet symlinks
|
||||
for (int i = 0; applet_names[i]; ++i) {
|
||||
sprintf(path, "/sbin/%s", applet_names[i]);
|
||||
xsymlink("/sbin/magisk", path);
|
||||
}
|
||||
xsymlink("/sbin/magiskinit", "/sbin/magiskpolicy");
|
||||
xsymlink("/sbin/magiskinit", "/sbin/supolicy");
|
||||
|
||||
close(rootdir);
|
||||
close(sbin);
|
||||
}
|
||||
|
||||
bool MagiskInit::patch_sepolicy() {
|
||||
bool patch_init = false;
|
||||
|
||||
if (access(SPLIT_PLAT_CIL, R_OK) == 0) {
|
||||
LOGD("sepol: split policy\n");
|
||||
patch_init = true;
|
||||
} else if (access("/sepolicy", R_OK) == 0) {
|
||||
LOGD("sepol: monolithic policy\n");
|
||||
load_policydb("/sepolicy");
|
||||
} else {
|
||||
LOGD("sepol: no selinux\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
// Mount selinuxfs to communicate with kernel
|
||||
xmount("selinuxfs", SELINUX_MNT, "selinuxfs", 0, nullptr);
|
||||
|
||||
if (patch_init)
|
||||
load_split_cil();
|
||||
|
||||
sepol_magisk_rules();
|
||||
sepol_allow(SEPOL_PROC_DOMAIN, ALL, ALL, ALL);
|
||||
dump_policydb("/sepolicy");
|
||||
|
||||
// Load policy to kernel so we can label rootfs
|
||||
if (load_sepol) {
|
||||
LOGD("sepol: preload sepolicy\n");
|
||||
dump_policydb(SELINUX_LOAD);
|
||||
}
|
||||
|
||||
// Remove OnePlus stupid debug sepolicy and use our own
|
||||
if (access("/sepolicy_debug", F_OK) == 0) {
|
||||
unlink("/sepolicy_debug");
|
||||
link("/sepolicy", "/sepolicy_debug");
|
||||
}
|
||||
|
||||
// Enable selinux functions
|
||||
selinux_builtin_impl();
|
||||
|
||||
return patch_init;
|
||||
}
|
||||
|
||||
#define umount_root(name) \
|
||||
if (mnt_##name) \
|
||||
umount("/" #name);
|
||||
|
||||
void MagiskInit::cleanup() {
|
||||
umount(SELINUX_MNT);
|
||||
umount("/sys");
|
||||
umount("/proc");
|
||||
umount_root(system);
|
||||
umount_root(vendor);
|
||||
umount_root(product);
|
||||
umount_root(odm);
|
||||
}
|
||||
|
||||
void MagiskInit::re_exec_init() {
|
||||
LOGD("Re-exec /init\n");
|
||||
cleanup();
|
||||
execv("/init", argv);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
void MagiskInit::start() {
|
||||
// Prevent file descriptor confusion
|
||||
mknod("/null", S_IFCHR | 0666, makedev(1, 3));
|
||||
int null = open("/null", O_RDWR | O_CLOEXEC);
|
||||
unlink("/null");
|
||||
xdup3(null, STDIN_FILENO, O_CLOEXEC);
|
||||
xdup3(null, STDOUT_FILENO, O_CLOEXEC);
|
||||
xdup3(null, STDERR_FILENO, O_CLOEXEC);
|
||||
if (null > STDERR_FILENO)
|
||||
close(null);
|
||||
|
||||
setup_klog();
|
||||
|
||||
load_kernel_info();
|
||||
|
||||
full_read("/init", &self.buf, &self.sz);
|
||||
full_read("/.backup/.magisk", &config.buf, &config.sz);
|
||||
|
||||
preset();
|
||||
early_mount();
|
||||
setup_rootfs();
|
||||
re_exec_init();
|
||||
}
|
||||
|
||||
void MagiskInit::test() {
|
||||
cmdline_logging();
|
||||
log_cb.ex = nop_ex;
|
||||
|
||||
chdir(dirname(argv[0]));
|
||||
chroot(".");
|
||||
chdir("/");
|
||||
|
||||
load_kernel_info();
|
||||
preset();
|
||||
early_mount();
|
||||
setup_rootfs();
|
||||
cleanup();
|
||||
}
|
||||
|
||||
static int test_main(int, char *argv[]) {
|
||||
MagiskInit init(argv);
|
||||
init.test();
|
||||
return 0;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
umask(0);
|
||||
|
||||
for (int i = 0; init_applet[i]; ++i) {
|
||||
if (strcmp(basename(argv[0]), init_applet[i]) == 0)
|
||||
return (*init_applet_main[i])(argc, argv);
|
||||
}
|
||||
|
||||
if (argc > 1 && strcmp(argv[1], "-x") == 0) {
|
||||
if (strcmp(argv[2], "magisk") == 0)
|
||||
return dump_magisk(argv[3], 0755);
|
||||
else if (strcmp(argv[2], "manager") == 0)
|
||||
return dump_manager(argv[3], 0644);
|
||||
}
|
||||
|
||||
if (getpid() != 1)
|
||||
return 1;
|
||||
|
||||
MagiskInit init(argv);
|
||||
|
||||
// Run the main routine
|
||||
init.start();
|
||||
}
|
||||
132
native/jni/init/early_mount.cpp
Normal file
132
native/jni/init/early_mount.cpp
Normal file
@ -0,0 +1,132 @@
|
||||
#include <sys/mount.h>
|
||||
#include <sys/sysmacros.h>
|
||||
#include <string.h>
|
||||
#include <stdio.h>
|
||||
|
||||
#include <utils.h>
|
||||
#include <logging.h>
|
||||
|
||||
#include "init.h"
|
||||
|
||||
using namespace std;
|
||||
|
||||
static void parse_device(device *dev, const char *uevent) {
|
||||
dev->partname[0] = '\0';
|
||||
FILE *fp = xfopen(uevent, "re");
|
||||
char buf[64];
|
||||
while (fgets(buf, sizeof(buf), fp)) {
|
||||
if (strncmp(buf, "MAJOR", 5) == 0) {
|
||||
sscanf(buf, "MAJOR=%d", &dev->major);
|
||||
} else if (strncmp(buf, "MINOR", 5) == 0) {
|
||||
sscanf(buf, "MINOR=%d", &dev->minor);
|
||||
} else if (strncmp(buf, "DEVNAME", 7) == 0) {
|
||||
sscanf(buf, "DEVNAME=%s", dev->devname);
|
||||
} else if (strncmp(buf, "PARTNAME", 8) == 0) {
|
||||
sscanf(buf, "PARTNAME=%s", dev->partname);
|
||||
}
|
||||
}
|
||||
fclose(fp);
|
||||
}
|
||||
|
||||
static vector<device> dev_list;
|
||||
|
||||
static void collect_devices() {
|
||||
char path[128];
|
||||
struct dirent *entry;
|
||||
device dev;
|
||||
DIR *dir = xopendir("/sys/dev/block");
|
||||
if (dir == nullptr)
|
||||
return;
|
||||
while ((entry = readdir(dir))) {
|
||||
if (entry->d_name == "."sv || entry->d_name == ".."sv)
|
||||
continue;
|
||||
sprintf(path, "/sys/dev/block/%s/uevent", entry->d_name);
|
||||
parse_device(&dev, path);
|
||||
dev_list.push_back(dev);
|
||||
}
|
||||
closedir(dir);
|
||||
}
|
||||
|
||||
static bool setup_block(const char *partname, char *block_dev) {
|
||||
if (dev_list.empty())
|
||||
collect_devices();
|
||||
for (auto &dev : dev_list) {
|
||||
if (strcasecmp(dev.partname, partname) == 0) {
|
||||
sprintf(block_dev, "/dev/block/%s", dev.devname);
|
||||
LOGD("Found %s: [%s] (%d, %d)\n", dev.partname, dev.devname, dev.major, dev.minor);
|
||||
xmkdir("/dev", 0755);
|
||||
xmkdir("/dev/block", 0755);
|
||||
mknod(block_dev, S_IFBLK | 0600, makedev(dev.major, dev.minor));
|
||||
return true;
|
||||
}
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
bool MagiskInit::read_dt_fstab(const char *name, char *partname, char *partfs) {
|
||||
char path[128];
|
||||
int fd;
|
||||
sprintf(path, "%s/fstab/%s/dev", cmd.dt_dir, name);
|
||||
if ((fd = xopen(path, O_RDONLY | O_CLOEXEC)) >= 0) {
|
||||
read(fd, path, sizeof(path));
|
||||
close(fd);
|
||||
// Some custom treble use different names, so use what we read
|
||||
char *part = rtrim(strrchr(path, '/') + 1);
|
||||
sprintf(partname, "%s%s", part, strend(part, cmd.slot) ? cmd.slot : "");
|
||||
sprintf(path, "%s/fstab/%s/type", cmd.dt_dir, name);
|
||||
if ((fd = xopen(path, O_RDONLY | O_CLOEXEC)) >= 0) {
|
||||
read(fd, partfs, 32);
|
||||
close(fd);
|
||||
return true;
|
||||
}
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
#define link_root(name) \
|
||||
if (is_lnk("/system_root" name)) \
|
||||
cp_afc("/system_root" name, name)
|
||||
|
||||
#define mount_root(name) \
|
||||
if (!is_lnk("/" #name) && read_dt_fstab(#name, partname, fstype)) { \
|
||||
LOGD("Early mount " #name "\n"); \
|
||||
setup_block(partname, block_dev); \
|
||||
xmkdir("/" #name, 0755); \
|
||||
xmount(block_dev, "/" #name, fstype, MS_RDONLY, nullptr); \
|
||||
mnt_##name = true; \
|
||||
}
|
||||
|
||||
void MagiskInit::early_mount() {
|
||||
char partname[32];
|
||||
char fstype[32];
|
||||
char block_dev[64];
|
||||
|
||||
if (cmd.system_as_root) {
|
||||
LOGD("Early mount system_root\n");
|
||||
sprintf(partname, "system%s", cmd.slot);
|
||||
setup_block(partname, block_dev);
|
||||
xmkdir("/system_root", 0755);
|
||||
xmount(block_dev, "/system_root", "ext4", MS_RDONLY, nullptr);
|
||||
xmkdir("/system", 0755);
|
||||
xmount("/system_root/system", "/system", nullptr, MS_BIND, nullptr);
|
||||
|
||||
// Android Q
|
||||
if (is_lnk("/system_root/init"))
|
||||
load_sepol = true;
|
||||
|
||||
// System-as-root with monolithic sepolicy
|
||||
if (access("/system_root/sepolicy", F_OK) == 0)
|
||||
cp_afc("/system_root/sepolicy", "/sepolicy");
|
||||
|
||||
// Copy if these partitions are symlinks
|
||||
link_root("/vendor");
|
||||
link_root("/product");
|
||||
link_root("/odm");
|
||||
} else {
|
||||
mount_root(system);
|
||||
}
|
||||
|
||||
mount_root(vendor);
|
||||
mount_root(product);
|
||||
mount_root(odm);
|
||||
}
|
||||
152
native/jni/init/getinfo.cpp
Normal file
152
native/jni/init/getinfo.cpp
Normal file
@ -0,0 +1,152 @@
|
||||
#include <sys/sysmacros.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <linux/input.h>
|
||||
#include <fcntl.h>
|
||||
|
||||
#include <utils.h>
|
||||
#include <logging.h>
|
||||
|
||||
#include "init.h"
|
||||
|
||||
using namespace std;
|
||||
|
||||
#define DEFAULT_DT_DIR "/proc/device-tree/firmware/android"
|
||||
|
||||
static void parse_cmdline(const std::function<void (std::string_view, const char *)> &fn) {
|
||||
char cmdline[4096];
|
||||
int fd = open("/proc/cmdline", O_RDONLY | O_CLOEXEC);
|
||||
cmdline[read(fd, cmdline, sizeof(cmdline))] = '\0';
|
||||
close(fd);
|
||||
|
||||
char *tok, *eql, *tmp, *saveptr;
|
||||
saveptr = cmdline;
|
||||
while ((tok = strtok_r(nullptr, " \n", &saveptr)) != nullptr) {
|
||||
eql = strchr(tok, '=');
|
||||
if (eql) {
|
||||
*eql = '\0';
|
||||
if (eql[1] == '"') {
|
||||
tmp = strchr(saveptr, '"');
|
||||
if (tmp != nullptr) {
|
||||
*tmp = '\0';
|
||||
saveptr[-1] = ' ';
|
||||
saveptr = tmp + 1;
|
||||
eql++;
|
||||
}
|
||||
}
|
||||
fn(tok, eql + 1);
|
||||
} else {
|
||||
fn(tok, "");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#define test_bit(bit, array) (array[bit / 8] & (1 << (bit % 8)))
|
||||
|
||||
static bool check_key_combo() {
|
||||
uint8_t bitmask[(KEY_MAX + 1) / 8];
|
||||
vector<int> events;
|
||||
constexpr const char *name = "/event";
|
||||
|
||||
for (int minor = 64; minor < 96; ++minor) {
|
||||
if (mknod(name, S_IFCHR | 0444, makedev(13, minor))) {
|
||||
PLOGE("mknod");
|
||||
continue;
|
||||
}
|
||||
int fd = open(name, O_RDONLY | O_CLOEXEC);
|
||||
unlink(name);
|
||||
if (fd < 0)
|
||||
continue;
|
||||
memset(bitmask, 0, sizeof(bitmask));
|
||||
ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(bitmask)), bitmask);
|
||||
if (test_bit(KEY_VOLUMEUP, bitmask))
|
||||
events.push_back(fd);
|
||||
}
|
||||
|
||||
if (events.empty())
|
||||
return false;
|
||||
|
||||
RunFinally fin([&]() -> void {
|
||||
for (const int &fd : events)
|
||||
close(fd);
|
||||
});
|
||||
|
||||
// Return true if volume key up is hold for more than 3 seconds
|
||||
int count = 0;
|
||||
for (int i = 0; i < 500; ++i) {
|
||||
for (const int &fd : events) {
|
||||
memset(bitmask, 0, sizeof(bitmask));
|
||||
ioctl(fd, EVIOCGKEY(sizeof(bitmask)), bitmask);
|
||||
if (test_bit(KEY_VOLUMEUP, bitmask)) {
|
||||
count++;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (count >= 300) {
|
||||
LOGD("KEY_VOLUMEUP detected: disable system-as-root\n");
|
||||
return true;
|
||||
}
|
||||
// Check every 10ms
|
||||
usleep(10000);
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
void MagiskInit::load_kernel_info() {
|
||||
// Communicate with kernel using procfs and sysfs
|
||||
xmkdir("/proc", 0755);
|
||||
xmount("proc", "/proc", "proc", 0, nullptr);
|
||||
xmkdir("/sys", 0755);
|
||||
xmount("sysfs", "/sys", "sysfs", 0, nullptr);
|
||||
|
||||
bool enter_recovery = false;
|
||||
bool kirin = false;
|
||||
bool recovery_mode = false;
|
||||
|
||||
parse_cmdline([&](auto key, auto value) -> void {
|
||||
LOGD("cmdline: [%s]=[%s]\n", key.data(), value);
|
||||
if (key == "androidboot.slot_suffix") {
|
||||
strcpy(cmd.slot, value);
|
||||
} else if (key == "androidboot.slot") {
|
||||
cmd.slot[0] = '_';
|
||||
strcpy(cmd.slot + 1, value);
|
||||
} else if (key == "skip_initramfs") {
|
||||
cmd.system_as_root = true;
|
||||
} else if (key == "androidboot.android_dt_dir") {
|
||||
strcpy(cmd.dt_dir, value);
|
||||
} else if (key == "enter_recovery") {
|
||||
enter_recovery = value[0] == '1';
|
||||
} else if (key == "androidboot.hardware") {
|
||||
kirin = strstr(value, "kirin") || strstr(value, "hi3660") || strstr(value, "hi6250");
|
||||
}
|
||||
});
|
||||
|
||||
parse_prop_file("/.backup/.magisk", [&](auto key, auto value) -> bool {
|
||||
if (key == "RECOVERYMODE" && value == "true")
|
||||
recovery_mode = true;
|
||||
return true;
|
||||
});
|
||||
|
||||
if (kirin && enter_recovery) {
|
||||
// Inform that we are actually booting as recovery
|
||||
if (!recovery_mode) {
|
||||
if (FILE *f = fopen("/.backup/.magisk", "ae"); f) {
|
||||
fprintf(f, "RECOVERYMODE=true\n");
|
||||
fclose(f);
|
||||
}
|
||||
recovery_mode = true;
|
||||
}
|
||||
}
|
||||
|
||||
if (recovery_mode) {
|
||||
LOGD("Running in recovery mode, waiting for key...\n");
|
||||
cmd.system_as_root = !check_key_combo();
|
||||
}
|
||||
|
||||
if (cmd.dt_dir[0] == '\0')
|
||||
strcpy(cmd.dt_dir, DEFAULT_DT_DIR);
|
||||
|
||||
LOGD("system_as_root=[%d]\n", cmd.system_as_root);
|
||||
LOGD("slot=[%s]\n", cmd.slot);
|
||||
LOGD("dt_dir=[%s]\n", cmd.dt_dir);
|
||||
}
|
||||
230
native/jni/init/init.cpp
Normal file
230
native/jni/init/init.cpp
Normal file
@ -0,0 +1,230 @@
|
||||
#include <sys/stat.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/mount.h>
|
||||
#include <sys/sysmacros.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <dirent.h>
|
||||
#include <fcntl.h>
|
||||
#include <libgen.h>
|
||||
|
||||
#include <xz.h>
|
||||
#include <magisk.h>
|
||||
#include <selinux.h>
|
||||
#include <cpio.h>
|
||||
#include <utils.h>
|
||||
#include <flags.h>
|
||||
|
||||
#include "binaries.h"
|
||||
#ifdef USE_64BIT
|
||||
#include "binaries_arch64.h"
|
||||
#else
|
||||
#include "binaries_arch.h"
|
||||
#endif
|
||||
|
||||
#include "init.h"
|
||||
|
||||
using namespace std;
|
||||
|
||||
#ifdef MAGISK_DEBUG
|
||||
static FILE *kmsg;
|
||||
static int vprintk(const char *fmt, va_list ap) {
|
||||
fprintf(kmsg, "magiskinit: ");
|
||||
return vfprintf(kmsg, fmt, ap);
|
||||
}
|
||||
|
||||
static void setup_klog() {
|
||||
mknod("/kmsg", S_IFCHR | 0666, makedev(1, 11));
|
||||
int fd = xopen("/kmsg", O_WRONLY | O_CLOEXEC);
|
||||
kmsg = fdopen(fd, "w");
|
||||
setbuf(kmsg, nullptr);
|
||||
unlink("/kmsg");
|
||||
log_cb.d = log_cb.i = log_cb.w = log_cb.e = vprintk;
|
||||
log_cb.ex = nop_ex;
|
||||
}
|
||||
#else
|
||||
#define setup_klog(...)
|
||||
#endif
|
||||
|
||||
static int test_main(int argc, char *argv[]);
|
||||
|
||||
constexpr const char *init_applet[] =
|
||||
{ "magiskpolicy", "supolicy", "init_test", nullptr };
|
||||
constexpr int (*init_applet_main[])(int, char *[]) =
|
||||
{ magiskpolicy_main, magiskpolicy_main, test_main, nullptr };
|
||||
|
||||
static bool unxz(int fd, const uint8_t *buf, size_t size) {
|
||||
uint8_t out[8192];
|
||||
xz_crc32_init();
|
||||
struct xz_dec *dec = xz_dec_init(XZ_DYNALLOC, 1 << 26);
|
||||
struct xz_buf b = {
|
||||
.in = buf,
|
||||
.in_pos = 0,
|
||||
.in_size = size,
|
||||
.out = out,
|
||||
.out_pos = 0,
|
||||
.out_size = sizeof(out)
|
||||
};
|
||||
enum xz_ret ret;
|
||||
do {
|
||||
ret = xz_dec_run(dec, &b);
|
||||
if (ret != XZ_OK && ret != XZ_STREAM_END)
|
||||
return false;
|
||||
write(fd, out, b.out_pos);
|
||||
b.out_pos = 0;
|
||||
} while (b.in_pos != size);
|
||||
return true;
|
||||
}
|
||||
|
||||
static void decompress_ramdisk() {
|
||||
constexpr char tmp[] = "tmp.cpio";
|
||||
constexpr char ramdisk_xz[] = "ramdisk.cpio.xz";
|
||||
if (access(ramdisk_xz, F_OK))
|
||||
return;
|
||||
LOGD("Decompressing ramdisk from %s\n", ramdisk_xz);
|
||||
uint8_t *buf;
|
||||
size_t sz;
|
||||
mmap_ro(ramdisk_xz, buf, sz);
|
||||
int fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC);
|
||||
unxz(fd, buf, sz);
|
||||
munmap(buf, sz);
|
||||
close(fd);
|
||||
cpio_mmap cpio(tmp);
|
||||
cpio.extract();
|
||||
unlink(tmp);
|
||||
unlink(ramdisk_xz);
|
||||
}
|
||||
|
||||
int dump_magisk(const char *path, mode_t mode) {
|
||||
int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, mode);
|
||||
if (fd < 0)
|
||||
return 1;
|
||||
if (!unxz(fd, magisk_xz, sizeof(magisk_xz)))
|
||||
return 1;
|
||||
close(fd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int dump_manager(const char *path, mode_t mode) {
|
||||
int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, mode);
|
||||
if (fd < 0)
|
||||
return 1;
|
||||
if (!unxz(fd, manager_xz, sizeof(manager_xz)))
|
||||
return 1;
|
||||
close(fd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void MagiskInit::preset() {
|
||||
root = open("/", O_RDONLY | O_CLOEXEC);
|
||||
|
||||
if (cmd.system_as_root) {
|
||||
// Clear rootfs
|
||||
LOGD("Cleaning rootfs\n");
|
||||
frm_rf(root, { "overlay", "proc", "sys" });
|
||||
} else {
|
||||
decompress_ramdisk();
|
||||
|
||||
// Revert original init binary
|
||||
rename("/.backup/init", "/init");
|
||||
rm_rf("/.backup");
|
||||
|
||||
// Do not go further if device is booting into recovery
|
||||
if (access("/sbin/recovery", F_OK) == 0) {
|
||||
LOGD("Ramdisk is recovery, abort\n");
|
||||
re_exec_init();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#define umount_root(name) \
|
||||
if (mnt_##name) \
|
||||
umount("/" #name);
|
||||
|
||||
void MagiskInit::cleanup() {
|
||||
umount(SELINUX_MNT);
|
||||
umount("/sys");
|
||||
umount("/proc");
|
||||
umount_root(system);
|
||||
umount_root(vendor);
|
||||
umount_root(product);
|
||||
umount_root(odm);
|
||||
}
|
||||
|
||||
void MagiskInit::re_exec_init() {
|
||||
LOGD("Re-exec /init\n");
|
||||
cleanup();
|
||||
execv("/init", argv);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
void MagiskInit::start() {
|
||||
// Prevent file descriptor confusion
|
||||
mknod("/null", S_IFCHR | 0666, makedev(1, 3));
|
||||
int null = open("/null", O_RDWR | O_CLOEXEC);
|
||||
unlink("/null");
|
||||
xdup3(null, STDIN_FILENO, O_CLOEXEC);
|
||||
xdup3(null, STDOUT_FILENO, O_CLOEXEC);
|
||||
xdup3(null, STDERR_FILENO, O_CLOEXEC);
|
||||
if (null > STDERR_FILENO)
|
||||
close(null);
|
||||
|
||||
setup_klog();
|
||||
|
||||
load_kernel_info();
|
||||
|
||||
full_read("/init", &self.buf, &self.sz);
|
||||
full_read("/.backup/.magisk", &config.buf, &config.sz);
|
||||
|
||||
preset();
|
||||
early_mount();
|
||||
setup_rootfs();
|
||||
re_exec_init();
|
||||
}
|
||||
|
||||
void MagiskInit::test() {
|
||||
cmdline_logging();
|
||||
log_cb.ex = nop_ex;
|
||||
|
||||
chdir(dirname(argv[0]));
|
||||
chroot(".");
|
||||
chdir("/");
|
||||
|
||||
load_kernel_info();
|
||||
preset();
|
||||
early_mount();
|
||||
setup_rootfs();
|
||||
cleanup();
|
||||
}
|
||||
|
||||
static int test_main(int, char *argv[]) {
|
||||
MagiskInit init(argv);
|
||||
init.test();
|
||||
return 0;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
umask(0);
|
||||
|
||||
for (int i = 0; init_applet[i]; ++i) {
|
||||
if (strcmp(basename(argv[0]), init_applet[i]) == 0)
|
||||
return (*init_applet_main[i])(argc, argv);
|
||||
}
|
||||
|
||||
if (argc > 1 && strcmp(argv[1], "-x") == 0) {
|
||||
if (strcmp(argv[2], "magisk") == 0)
|
||||
return dump_magisk(argv[3], 0755);
|
||||
else if (strcmp(argv[2], "manager") == 0)
|
||||
return dump_manager(argv[3], 0644);
|
||||
}
|
||||
|
||||
if (getpid() != 1)
|
||||
return 1;
|
||||
|
||||
MagiskInit init(argv);
|
||||
|
||||
// Run the main routine
|
||||
init.start();
|
||||
}
|
||||
56
native/jni/init/init.h
Normal file
56
native/jni/init/init.h
Normal file
@ -0,0 +1,56 @@
|
||||
#include <stdlib.h>
|
||||
|
||||
struct cmdline {
|
||||
bool system_as_root;
|
||||
char slot[3];
|
||||
char dt_dir[128];
|
||||
};
|
||||
|
||||
struct raw_data {
|
||||
void *buf;
|
||||
size_t sz;
|
||||
};
|
||||
|
||||
struct device {
|
||||
int major;
|
||||
int minor;
|
||||
char devname[32];
|
||||
char partname[32];
|
||||
};
|
||||
|
||||
class MagiskInit {
|
||||
private:
|
||||
cmdline cmd{};
|
||||
raw_data self{};
|
||||
raw_data config{};
|
||||
int root = -1;
|
||||
char **argv;
|
||||
bool load_sepol = false;
|
||||
bool mnt_system = false;
|
||||
bool mnt_vendor = false;
|
||||
bool mnt_product = false;
|
||||
bool mnt_odm = false;
|
||||
|
||||
void load_kernel_info();
|
||||
void preset();
|
||||
void early_mount();
|
||||
void setup_rootfs();
|
||||
bool read_dt_fstab(const char *name, char *partname, char *partfs);
|
||||
bool patch_sepolicy();
|
||||
void cleanup();
|
||||
void re_exec_init();
|
||||
|
||||
public:
|
||||
explicit MagiskInit(char *argv[]) : argv(argv) {}
|
||||
void start();
|
||||
void test();
|
||||
};
|
||||
|
||||
static inline bool is_lnk(const char *name) {
|
||||
struct stat st;
|
||||
if (lstat(name, &st))
|
||||
return false;
|
||||
return S_ISLNK(st.st_mode);
|
||||
}
|
||||
|
||||
int dump_magisk(const char *path, mode_t mode);
|
||||
216
native/jni/init/rootfs.cpp
Normal file
216
native/jni/init/rootfs.cpp
Normal file
@ -0,0 +1,216 @@
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <fcntl.h>
|
||||
|
||||
#include <magisk.h>
|
||||
#include <utils.h>
|
||||
|
||||
#include "init.h"
|
||||
#include "magiskrc.h"
|
||||
|
||||
#ifdef USE_64BIT
|
||||
#define LIBNAME "lib64"
|
||||
#else
|
||||
#define LIBNAME "lib"
|
||||
#endif
|
||||
|
||||
using namespace std;
|
||||
|
||||
static void patch_socket_name(const char *path) {
|
||||
uint8_t *buf;
|
||||
char name[sizeof(MAIN_SOCKET)];
|
||||
size_t size;
|
||||
mmap_rw(path, buf, size);
|
||||
for (int i = 0; i < size; ++i) {
|
||||
if (memcmp(buf + i, MAIN_SOCKET, sizeof(MAIN_SOCKET)) == 0) {
|
||||
gen_rand_str(name, sizeof(name));
|
||||
memcpy(buf + i, name, sizeof(name));
|
||||
i += sizeof(name);
|
||||
}
|
||||
}
|
||||
munmap(buf, size);
|
||||
}
|
||||
|
||||
constexpr const char wrapper[] =
|
||||
"#!/system/bin/sh\n"
|
||||
"export LD_LIBRARY_PATH=\"$LD_LIBRARY_PATH:/apex/com.android.runtime/" LIBNAME "\"\n"
|
||||
"exec /sbin/magisk.bin \"$0\" \"$@\"\n"
|
||||
;
|
||||
|
||||
void MagiskInit::setup_rootfs() {
|
||||
bool patch_init = patch_sepolicy();
|
||||
|
||||
if (cmd.system_as_root) {
|
||||
// Clone rootfs
|
||||
LOGD("Clone root dir from system to rootfs\n");
|
||||
int system_root = xopen("/system_root", O_RDONLY | O_CLOEXEC);
|
||||
clone_dir(system_root, root, false);
|
||||
close(system_root);
|
||||
}
|
||||
|
||||
if (patch_init) {
|
||||
constexpr char SYSTEM_INIT[] = "/system/bin/init";
|
||||
// If init is symlink, copy it to rootfs so we can patch
|
||||
if (is_lnk("/init"))
|
||||
cp_afc(SYSTEM_INIT, "/init");
|
||||
|
||||
char *addr;
|
||||
size_t size;
|
||||
mmap_rw("/init", addr, size);
|
||||
for (char *p = addr; p < addr + size; ++p) {
|
||||
if (memcmp(p, SPLIT_PLAT_CIL, sizeof(SPLIT_PLAT_CIL)) == 0) {
|
||||
// Force init to load /sepolicy
|
||||
LOGD("Remove from init: " SPLIT_PLAT_CIL "\n");
|
||||
memset(p, 'x', sizeof(SPLIT_PLAT_CIL) - 1);
|
||||
p += sizeof(SPLIT_PLAT_CIL) - 1;
|
||||
} else if (memcmp(p, SYSTEM_INIT, sizeof(SYSTEM_INIT)) == 0) {
|
||||
// Force execute /init instead of /system/bin/init
|
||||
LOGD("Patch init: [/system/bin/init] -> [/init]\n");
|
||||
strcpy(p, "/init");
|
||||
p += sizeof(SYSTEM_INIT) - 1;
|
||||
}
|
||||
}
|
||||
munmap(addr, size);
|
||||
}
|
||||
|
||||
// Handle ramdisk overlays
|
||||
int fd = open("/overlay", O_RDONLY | O_CLOEXEC);
|
||||
if (fd >= 0) {
|
||||
LOGD("Merge overlay folder\n");
|
||||
mv_dir(fd, root);
|
||||
close(fd);
|
||||
rmdir("/overlay");
|
||||
}
|
||||
|
||||
// Patch init.rc
|
||||
FILE *rc = xfopen("/init.p.rc", "we");
|
||||
file_readline("/init.rc", [&](auto line) -> bool {
|
||||
// Do not start vaultkeeper
|
||||
if (str_contains(line, "start vaultkeeper")) {
|
||||
LOGD("Remove vaultkeeper\n");
|
||||
return true;
|
||||
}
|
||||
// Do not run flash_recovery
|
||||
if (str_starts(line, "service flash_recovery")) {
|
||||
LOGD("Remove flash_recovery\n");
|
||||
fprintf(rc, "service flash_recovery /system/bin/xxxxx\n");
|
||||
return true;
|
||||
}
|
||||
// Else just write the line
|
||||
fprintf(rc, "%s", line.data());
|
||||
return true;
|
||||
});
|
||||
char pfd_svc[8], ls_svc[8], bc_svc[8];
|
||||
// Make sure to be unique
|
||||
pfd_svc[0] = 'a';
|
||||
ls_svc[0] = '0';
|
||||
bc_svc[0] = 'A';
|
||||
gen_rand_str(pfd_svc + 1, sizeof(pfd_svc) - 1);
|
||||
gen_rand_str(ls_svc + 1, sizeof(ls_svc) - 1);
|
||||
gen_rand_str(bc_svc + 1, sizeof(bc_svc) - 1);
|
||||
LOGD("Inject magisk services: [%s] [%s] [%s]\n", pfd_svc, ls_svc, bc_svc);
|
||||
fprintf(rc, magiskrc, pfd_svc, pfd_svc, ls_svc, bc_svc, bc_svc);
|
||||
fclose(rc);
|
||||
clone_attr("/init.rc", "/init.p.rc");
|
||||
rename("/init.p.rc", "/init.rc");
|
||||
|
||||
// Don't let init run in init yet
|
||||
lsetfilecon("/init", "u:object_r:rootfs:s0");
|
||||
|
||||
// Create hardlink mirror of /sbin to /root
|
||||
mkdir("/root", 0750);
|
||||
clone_attr("/sbin", "/root");
|
||||
int rootdir = xopen("/root", O_RDONLY | O_CLOEXEC);
|
||||
int sbin = xopen("/sbin", O_RDONLY | O_CLOEXEC);
|
||||
link_dir(sbin, rootdir);
|
||||
close(sbin);
|
||||
|
||||
LOGD("Mount /sbin tmpfs overlay\n");
|
||||
xmount("tmpfs", "/sbin", "tmpfs", 0, "mode=755");
|
||||
sbin = xopen("/sbin", O_RDONLY | O_CLOEXEC);
|
||||
|
||||
char path[64];
|
||||
|
||||
// Create symlinks pointing back to /root
|
||||
DIR *dir = xfdopendir(rootdir);
|
||||
struct dirent *entry;
|
||||
while((entry = xreaddir(dir))) {
|
||||
if (entry->d_name == "."sv || entry->d_name == ".."sv)
|
||||
continue;
|
||||
sprintf(path, "/root/%s", entry->d_name);
|
||||
xsymlinkat(path, sbin, entry->d_name);
|
||||
}
|
||||
|
||||
// Dump binaries
|
||||
mkdir(MAGISKTMP, 0755);
|
||||
fd = xopen(MAGISKTMP "/config", O_WRONLY | O_CREAT, 0000);
|
||||
write(fd, config.buf, config.sz);
|
||||
close(fd);
|
||||
fd = xopen("/sbin/magiskinit", O_WRONLY | O_CREAT, 0755);
|
||||
write(fd, self.buf, self.sz);
|
||||
close(fd);
|
||||
if (access("/system/apex", F_OK) == 0) {
|
||||
LOGD("APEX detected, use wrapper\n");
|
||||
dump_magisk("/sbin/magisk.bin", 0755);
|
||||
patch_socket_name("/sbin/magisk.bin");
|
||||
fd = xopen("/sbin/magisk", O_WRONLY | O_CREAT, 0755);
|
||||
write(fd, wrapper, sizeof(wrapper) - 1);
|
||||
close(fd);
|
||||
} else {
|
||||
dump_magisk("/sbin/magisk", 0755);
|
||||
patch_socket_name("/sbin/magisk");
|
||||
}
|
||||
|
||||
// Create applet symlinks
|
||||
for (int i = 0; applet_names[i]; ++i) {
|
||||
sprintf(path, "/sbin/%s", applet_names[i]);
|
||||
xsymlink("/sbin/magisk", path);
|
||||
}
|
||||
xsymlink("/sbin/magiskinit", "/sbin/magiskpolicy");
|
||||
xsymlink("/sbin/magiskinit", "/sbin/supolicy");
|
||||
|
||||
close(rootdir);
|
||||
close(sbin);
|
||||
}
|
||||
|
||||
bool MagiskInit::patch_sepolicy() {
|
||||
bool patch_init = false;
|
||||
|
||||
if (access(SPLIT_PLAT_CIL, R_OK) == 0) {
|
||||
LOGD("sepol: split policy\n");
|
||||
patch_init = true;
|
||||
} else if (access("/sepolicy", R_OK) == 0) {
|
||||
LOGD("sepol: monolithic policy\n");
|
||||
load_policydb("/sepolicy");
|
||||
} else {
|
||||
LOGD("sepol: no selinux\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
// Mount selinuxfs to communicate with kernel
|
||||
xmount("selinuxfs", SELINUX_MNT, "selinuxfs", 0, nullptr);
|
||||
|
||||
if (patch_init)
|
||||
load_split_cil();
|
||||
|
||||
sepol_magisk_rules();
|
||||
sepol_allow(SEPOL_PROC_DOMAIN, ALL, ALL, ALL);
|
||||
dump_policydb("/sepolicy");
|
||||
|
||||
// Load policy to kernel so we can label rootfs
|
||||
if (load_sepol) {
|
||||
LOGD("sepol: preload sepolicy\n");
|
||||
dump_policydb(SELINUX_LOAD);
|
||||
}
|
||||
|
||||
// Remove OnePlus stupid debug sepolicy and use our own
|
||||
if (access("/sepolicy_debug", F_OK) == 0) {
|
||||
unlink("/sepolicy_debug");
|
||||
link("/sepolicy", "/sepolicy_debug");
|
||||
}
|
||||
|
||||
// Enable selinux functions
|
||||
selinux_builtin_impl();
|
||||
|
||||
return patch_init;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user