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Stop embedding magisk in magiskinit

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This commit is contained in:
topjohnwu
2021-01-18 04:25:26 -08:00
parent 42278f12ff
commit 5a71998b4e
11 changed files with 140 additions and 136 deletions
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15
native/jni/Android.mk
View File

@@ -54,21 +54,10 @@ endif
include $(CLEAR_VARS)
ifdef B_INIT
LOCAL_MODULE := magiskinit
BB_INIT := 1
else ifdef B_INIT64
LOCAL_MODULE := magiskinit64
LOCAL_CPPFLAGS += -DUSE_64BIT
BB_INIT := 1
endif
ifdef BB_INIT
LOCAL_STATIC_LIBRARIES := libsepol libxz libutils
LOCAL_C_INCLUDES := \
jni/include \
out \
out/$(TARGET_ARCH_ABI)
LOCAL_C_INCLUDES := jni/include out
LOCAL_SRC_FILES := \
init/init.cpp \

43
native/jni/init/init.cpp
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@@ -10,12 +10,6 @@
#include <utils.hpp>
#include "binaries.h"
#ifdef USE_64BIT
#include "binaries_arch64.h"
#else
#include "binaries_arch.h"
#endif
#include "init.hpp"
using namespace std;
@@ -26,7 +20,7 @@ using namespace std;
constexpr int (*init_applet_main[])(int, char *[]) =
{ magiskpolicy_main, magiskpolicy_main, nullptr };
static bool unxz(int fd, const uint8_t *buf, size_t size) {
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);
@@ -49,16 +43,6 @@ static bool unxz(int fd, const uint8_t *buf, size_t size) {
return true;
}
int dump_magisk(const char *path, mode_t mode) {
int fd = xopen(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 = xopen(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, mode);
if (fd < 0)
@@ -147,10 +131,9 @@ int main(int argc, char *argv[]) {
#endif
if (argc > 1 && argv[1] == "-x"sv) {
if (argv[2] == "magisk"sv)
return dump_magisk(argv[3], 0755);
else if (argv[2] == "manager"sv)
if (argc > 2 && argv[2] == "manager"sv)
return dump_manager(argv[3], 0644);
return 1;
}
if (getpid() != 1)
@@ -166,18 +149,16 @@ int main(int argc, char *argv[]) {
// This will also mount /sys and /proc
load_kernel_info(&cmd);
if (cmd.skip_initramfs) {
if (cmd.skip_initramfs)
init = new SARInit(argv, &cmd);
} else {
if (cmd.force_normal_boot)
init = new FirstStageInit(argv, &cmd);
else if (access("/sbin/recovery", F_OK) == 0 || access("/system/bin/recovery", F_OK) == 0)
init = new RecoveryInit(argv, &cmd);
else if (check_two_stage())
init = new FirstStageInit(argv, &cmd);
else
init = new RootFSInit(argv, &cmd);
}
else if (cmd.force_normal_boot)
init = new FirstStageInit(argv, &cmd);
else if (access("/sbin/recovery", F_OK) == 0 || access("/system/bin/recovery", F_OK) == 0)
init = new RecoveryInit(argv, &cmd);
else if (check_two_stage())
init = new FirstStageInit(argv, &cmd);
else
init = new RootFSInit(argv, &cmd);
}
// Run the main routine

2
native/jni/init/init.hpp
View File

@@ -31,9 +31,9 @@ struct fstab_entry {
extern std::vector<std::string> mount_list;
bool unxz(int fd, const uint8_t *buf, size_t size);
void load_kernel_info(cmdline *cmd);
bool check_two_stage();
int dump_magisk(const char *path, mode_t mode);
void setup_klog();
/***************

11
native/jni/init/mount.cpp
View File

@@ -378,13 +378,6 @@ void BaseInit::exec_init() {
exit(1);
}
static void patch_socket_name(const char *path) {
char rstr[16];
gen_rand_str(rstr, sizeof(rstr));
auto bin = mmap_data::rw(path);
bin.patch({ make_pair(MAIN_SOCKET, rstr) });
}
void MagiskInit::setup_tmp(const char *path) {
LOGD("Setup Magisk tmp at %s\n", path);
xmount("tmpfs", path, "tmpfs", 0, "mode=755");
@@ -401,8 +394,8 @@ void MagiskInit::setup_tmp(const char *path) {
fd = xopen("magiskinit", O_WRONLY | O_CREAT, 0755);
xwrite(fd, self.buf, self.sz);
close(fd);
dump_magisk("magisk", 0755);
patch_socket_name("magisk");
// The magisk binary will be handled later
// Create applet symlinks
for (int i = 0; applet_names[i]; ++i)

27
native/jni/init/rootdir.cpp
View File

@@ -174,6 +174,13 @@ static void magic_mount(const string &sdir, const string &ddir = "") {
}
}
static void patch_socket_name(const char *path) {
char rstr[16];
gen_rand_str(rstr, sizeof(rstr));
auto bin = mmap_data::rw(path);
bin.patch({ make_pair(MAIN_SOCKET, rstr) });
}
#define ROOTMIR MIRRDIR "/system_root"
#define MONOPOLICY "/sepolicy"
#define NEW_INITRC "/system/etc/init/hw/init.rc"
@@ -280,9 +287,19 @@ void SARBase::patch_rootdir() {
patch_init_rc(NEW_INITRC, ROOTOVL NEW_INITRC, tmp_dir.data());
}
// Extract magisk
{
auto magisk = mmap_data::ro("magisk.xz");
unlink("magisk.xz");
int fd = xopen("magisk", O_WRONLY | O_CREAT, 0755);
unxz(fd, magisk.buf, magisk.sz);
close(fd);
patch_socket_name("magisk");
}
// Mount rootdir
magic_mount(ROOTOVL);
int dest = xopen(ROOTMNT, O_WRONLY | O_CREAT | O_CLOEXEC, 0);
int dest = xopen(ROOTMNT, O_WRONLY | O_CREAT, 0);
write(dest, magic_mount_list.data(), magic_mount_list.length());
close(dest);
@@ -335,15 +352,23 @@ void MagiskProxy::start() {
// Backup stuffs before removing them
self = mmap_data::ro("/sbin/magisk");
config = mmap_data::ro("/.backup/.magisk");
auto magisk = mmap_data::ro("/sbin/magisk.xz");
char custom_rules_dir[64];
custom_rules_dir[0] = '\0';
xreadlink(TMP_RULESDIR, custom_rules_dir, sizeof(custom_rules_dir));
unlink("/sbin/magisk");
unlink("/sbin/magisk.xz");
rm_rf("/.backup");
setup_tmp("/sbin");
// Extract magisk
int fd = xopen("/sbin/magisk", O_WRONLY | O_CREAT, 0755);
unxz(fd, magisk.buf, magisk.sz);
close(fd);
patch_socket_name("/sbin/magisk");
// Create symlinks pointing back to /root
recreate_sbin("/root", false);