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Preparation for dynamic tmpfs path

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This commit is contained in:
topjohnwu 2020-04-12 05:34:56 -07:00
parent d739dcac2b
commit e0a281583d
13 changed files with 289 additions and 258 deletions
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1
native/jni/Android.mk
View File

@ -61,6 +61,7 @@ LOCAL_SRC_FILES := \
init/rootdir.cpp \
init/getinfo.cpp \
init/twostage.cpp \
core/socket.cpp \
magiskpolicy/api.cpp \
magiskpolicy/magiskpolicy.cpp \
magiskpolicy/rules.cpp \

227
native/jni/core/bootstages.cpp
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@ -6,6 +6,7 @@
#include <fcntl.h>
#include <string.h>
#include <dirent.h>
#include <libgen.h>
#include <vector>
#include <string>
@ -19,7 +20,6 @@
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;
@ -74,7 +74,6 @@ private:
string get_path();
void insert(node_entry *&);
void clone_skeleton();
int get_path(char *path);
};
bool node_entry::vendor_root = false;
@ -97,16 +96,12 @@ bool node_entry::is_root() {
}
string node_entry::get_path() {
get_path(buf);
return buf;
}
int node_entry::get_path(char *path) {
int len = 0;
string path;
if (parent)
len = parent->get_path(path);
len += sprintf(path + len, "/%s", name.c_str());
return len;
path = parent->get_path();
path += "/";
path += name;
return path;
}
void node_entry::insert(node_entry *&node) {
@ -129,9 +124,9 @@ void node_entry::insert(node_entry *&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());
auto cwd = MODULEROOT + "/"s + module + full_path;
auto dir = xopen_dir(buf);
auto dir = xopen_dir(cwd.data());
if (!dir)
return;
@ -139,7 +134,7 @@ void node_entry::create_module_tree(const char *module) {
if (faccessat(dirfd(dir.get()), ".replace", F_OK, 0) == 0) {
if (is_root()) {
// Root nodes should not be replaced
rm_rf(buf);
rm_rf(cwd.data());
} else if (status < IS_MODULE) {
// Upgrade current node to current module
this->module = module;
@ -154,9 +149,8 @@ void node_entry::create_module_tree(const char *module) {
// 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);
auto dest = full_path + "/" + entry->d_name;
auto src = cwd + "/" + entry->d_name;
/*
* Clone current directory in one of the following conditions:
@ -165,17 +159,17 @@ void node_entry::create_module_tree(const char *module) {
* - Target file is a symlink (exclude special nodes)
*/
bool clone = false;
if (IS_LNK(node) || access(buf, F_OK) != 0) {
if (IS_LNK(node) || access(dest.data(), F_OK) != 0) {
clone = true;
} else if (!node->is_special()) {
struct stat s;
xlstat(buf, &s);
xlstat(dest.data(), &s);
if (S_ISLNK(s.st_mode))
clone = true;
}
if (clone && is_root()) {
// Root nodes should not be cloned
rm_rf(buf2);
rm_rf(src.data());
delete node;
continue;
}
@ -189,7 +183,7 @@ void node_entry::create_module_tree(const char *module) {
node->status = IS_INTER;
} else {
// Clone attributes from real path
clone_attr(buf, buf2);
clone_attr(dest.data(), src.data());
if (IS_DIR(node)) {
// First mark as an intermediate node
node->status = IS_INTER;
@ -209,8 +203,9 @@ void node_entry::create_module_tree(const char *module) {
void node_entry::clone_skeleton() {
// Clone the structure
auto full_path = get_path();
snprintf(buf, PATH_MAX, "%s%s", MIRRDIR, full_path.data());
if (auto dir = xopen_dir(buf); dir) {
auto mirror_path = MAGISKTMP + "/" MIRRDIR + full_path;
if (auto dir = xopen_dir(mirror_path.data()); dir) {
for (dirent *entry; (entry = xreaddir(dir.get()));) {
if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue;
@ -222,42 +217,41 @@ void node_entry::clone_skeleton() {
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);
getattr(full_path.data(), &attr);
LOGI("mnt_tmpfs : %s\n", full_path.data());
xmount("tmpfs", full_path.data(), "tmpfs", 0, nullptr);
setattr(full_path.data(), &attr);
}
for (auto &child : children) {
snprintf(buf, PATH_MAX, "%s/%s", full_path.c_str(), child->name.c_str());
auto dest = full_path + "/" + child->name;
string src;
// Create the dummy file/directory
if (IS_DIR(child))
xmkdir(buf, 0755);
xmkdir(dest.data(), 0755);
else if (IS_REG(child))
close(creat(buf, 0644));
close(creat(dest.data(), 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());
src = MAGISKTMP + "/" MODULEMNT "/" + child->module + full_path + "/" + child->name;
} 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());
src = MAGISKTMP + "/" MIRRDIR + full_path + "/" + child->name;
}
if (IS_LNK(child)) {
// Copy symlinks directly
cp_afc(buf2, buf);
VLOGI("copy_link ", buf2, buf);
cp_afc(src.data(), dest.data());
VLOGI("copy_link ", src.data(), dest.data());
} else {
snprintf(buf, PATH_MAX, "%s/%s", full_path.c_str(), child->name.c_str());
bind_mount(buf2, buf);
bind_mount(src.data(), dest.data());
}
}
}
@ -265,9 +259,9 @@ void node_entry::clone_skeleton() {
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());
auto dest = get_path();
auto src = MAGISKTMP + "/" MODULEMNT "/" + module + dest;
bind_mount(src.data(), dest.data());
} else if (status & IS_SKEL) {
// The node is labeled to be cloned with skeleton, lets do it
clone_skeleton();
@ -302,16 +296,19 @@ static int bind_mount(const char *from, const char *to, bool log) {
return ret;
}
#define MIRRMNT(part) MIRRDIR "/" #part
#define PARTBLK(part) BLOCKDIR "/" #part
#define DIR_IS(part) (me->mnt_dir == "/" #part ""sv)
#define DIR_IS(part) (me->mnt_dir == "/" #part ""sv)
#define SETMIR(b, part) sprintf(b, "%s/" MIRRDIR "/" #part, MAGISKTMP.data())
#define SETBLK(b, part) sprintf(b, "%s/" BLOCKDIR "/" #part, MAGISKTMP.data())
#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)); \
SETMIR(buf1, part); \
SETBLK(buf2, part); \
mknod(buf2, (st.st_mode & S_IFMT) | 0600, st.st_rdev); \
xmkdir(buf1, 0755); \
xmount(buf2, buf1, me->mnt_type, flag, nullptr); \
VLOGI("mount", buf2, buf1); \
}
static bool magisk_env() {
@ -320,11 +317,13 @@ static bool magisk_env() {
string pkg;
check_manager(&pkg);
char install_dir[128];
sprintf(install_dir, "%s/0/%s/install", APP_DATA_DIR, pkg.data());
char buf1[4096];
char buf2[4096];
sprintf(buf1, "%s/0/%s/install", APP_DATA_DIR, pkg.data());
// Alternative binaries paths
const char *alt_bin[] = { "/cache/data_adb/magisk", "/data/magisk", install_dir };
const char *alt_bin[] = { "/cache/data_adb/magisk", "/data/magisk", buf1 };
for (auto alt : alt_bin) {
struct stat st;
if (lstat(alt, &st) != -1) {
@ -348,14 +347,11 @@ static bool magisk_env() {
unlink("/data/magisk_merge.img");
unlink("/data/magisk_debug.log");
// Directories in tmpfs overlay
xmkdir(MIRRDIR, 0);
xmkdir(BLOCKDIR, 0);
xmkdir(BBPATH, 0755);
xmkdir(MODULEMNT, 0755);
// Backwards compatibility for old Magisk Manager
xsymlink("./modules", MAGISKTMP "/img");
sprintf(buf1, "%s/" MODULEMNT, MAGISKTMP.data());
xmkdir(buf1, 0755);
// TODO: Remove. Backwards compatibility for old manager
sprintf(buf1, "%s/" INTLROOT "/img", MAGISKTMP.data());
xsymlink("./modules", buf1);
// Directories in /data/adb
xmkdir(DATABIN, 0755);
@ -369,8 +365,9 @@ static bool magisk_env() {
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));
SETMIR(buf1, system);
xsymlink("./system_root/system", buf1);
VLOGI("link", "./system_root/system", buf1);
system_as_root = true;
} else if (!system_as_root && DIR_IS(system)) {
mount_mirror(system, MS_RDONLY);
@ -385,18 +382,22 @@ static bool magisk_env() {
}
return true;
});
if (access(MIRRMNT(system), F_OK) != 0 && access(MIRRMNT(system_root), F_OK) == 0) {
SETMIR(buf1, system);
SETMIR(buf2, system_root);
if (access(buf1, F_OK) != 0 && access(buf2, F_OK) == 0) {
// Pre-init mirrors
xsymlink("./system_root/system", MIRRMNT(system));
VLOGI("link", MIRRMNT(system_root) "/system", MIRRMNT(system));
xsymlink("./system_root/system", buf1);
VLOGI("link", "./system_root/system", buf1);
}
if (access(MIRRMNT(vendor), F_OK) != 0) {
xsymlink("./system/vendor", MIRRMNT(vendor));
VLOGI("link", MIRRMNT(system) "/vendor", MIRRMNT(vendor));
SETMIR(buf1, vendor);
if (access(buf1, F_OK) != 0) {
xsymlink("./system/vendor", buf1);
VLOGI("link", "./system/vendor", buf1);
}
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));
SETMIR(buf1, product);
if (access("/system/product", F_OK) == 0 && access(buf1, F_OK) != 0) {
xsymlink("./system/product", buf1);
VLOGI("link", "./system/product", buf1);
}
// Disable/remove magiskhide, resetprop
@ -407,9 +408,13 @@ static bool magisk_env() {
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);
// TODO: Remove. Backwards compatibility for old manager
LOGI("* Setting up internal busybox\n");
sprintf(buf1, "%s/" BBPATH "/busybox", MAGISKTMP.data());
mkdir(dirname(buf1), 0755);
cp_afc(DATABIN "/busybox", buf1);
exec_command_sync(buf1, "--install", "-s", dirname(buf1));
return true;
}
@ -417,22 +422,27 @@ static bool magisk_env() {
static void prepare_modules() {
// Upgrade modules
if (auto dir = open_dir(MODULEUPGRADE); dir) {
int ufd = dirfd(dir.get());
int mfd = xopen(MODULEROOT, O_RDONLY | O_CLOEXEC);
for (dirent *entry; (entry = xreaddir(dir.get()));) {
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);
if (faccessat(mfd, entry->d_name, F_OK, 0) == 0) {
frm_rf(xopenat(mfd, entry->d_name, O_RDONLY | O_CLOEXEC));
unlinkat(mfd, entry->d_name, AT_REMOVEDIR);
}
LOGI("Upgrade / New module: %s\n", entry->d_name);
snprintf(buf2, sizeof(buf2), "%s/%s", MODULEUPGRADE, entry->d_name);
rename(buf2, buf);
renameat(ufd, entry->d_name, mfd, entry->d_name);
}
}
close(mfd);
rm_rf(MODULEUPGRADE);
}
bind_mount(MIRRDIR MODULEROOT, MODULEMNT, false);
auto src = MAGISKTMP + "/" MIRRDIR "/" MODULEROOT;
auto dest = MAGISKTMP + "/" MODULEMNT;
bind_mount(src.data(), dest.data(), false);
restorecon();
chmod(SECURE_DIR, 0700);
@ -475,9 +485,9 @@ static void collect_modules() {
if (faccessat(modfd, "remove", F_OK, 0) == 0) {
LOGI("%s: remove\n", entry->d_name);
fd_pathat(modfd, "uninstall.sh", buf, sizeof(buf));
if (access(buf, F_OK) == 0)
exec_script(buf);
auto uninstaller = MODULEROOT + "/"s + entry->d_name + "/uninstall.sh";
if (access(uninstaller.data(), F_OK) == 0)
exec_script(uninstaller.data());
frm_rf(xdup(modfd));
unlinkat(dfd, entry->d_name, AT_REMOVEDIR);
continue;
@ -492,51 +502,56 @@ static void collect_modules() {
}
static bool load_modules(node_entry *root) {
LOGI("* Loading modules\n");
char buf1[4096];
char buf2[4096];
LOGI("* Loading modules\n");
bool has_modules = false;
for (const auto &m : module_list) {
const auto module = m.data();
char *name = buf + snprintf(buf, sizeof(buf), MODULEROOT "/%s/", module);
auto module = m.data();
char *b1 = buf1 + sprintf(buf1, MODULEROOT "/%s/", module);
// Read props
strcpy(name, "system.prop");
if (access(buf, F_OK) == 0) {
strcpy(b1, "system.prop");
if (access(buf1, F_OK) == 0) {
LOGI("%s: loading [system.prop]\n", module);
load_prop_file(buf, false);
load_prop_file(buf1, false);
}
// Copy sepolicy rules
strcpy(name, "sepolicy.rule");
if (access(MIRRDIR "/persist", F_OK) == 0 && access(buf, F_OK) == 0) {
char *p = buf2 + snprintf(buf2, sizeof(buf2), MIRRDIR "/persist/magisk/%s", module);
strcpy(b1, "sepolicy.rule");
char *b2 = buf2 + sprintf(buf2, "%s/" MIRRDIR "/persist", MAGISKTMP.data());
if (access(buf2, F_OK) == 0 && access(buf1, F_OK) == 0) {
b2 += sprintf(b2, "/magisk/%s", module);
xmkdirs(buf2, 0755);
strcpy(p, "/sepolicy.rule");
cp_afc(buf, buf2);
strcpy(b2, "/sepolicy.rule");
cp_afc(buf1, buf2);
}
// Check whether skip mounting
strcpy(name, "skip_mount");
if (access(buf, F_OK) == 0)
strcpy(b1, "skip_mount");
if (access(buf1, F_OK) == 0)
continue;
// Double check whether the system folder exists
strcpy(name, "system");
if (access(buf, F_OK) != 0)
strcpy(b1, "system");
if (access(buf1, F_OK) != 0)
continue;
// Construct structure
has_modules = true;
LOGI("%s: constructing magic mount structure\n", module);
// If /system/vendor exists in module, create a link outside
strcpy(name, "system/vendor");
if (node_entry::vendor_root && access(buf, F_OK) == 0) {
snprintf(buf2, sizeof(buf2), "%s/%s/vendor", MODULEROOT, module);
strcpy(b1, "system/vendor");
if (node_entry::vendor_root && access(buf1, F_OK) == 0) {
sprintf(buf2, MODULEROOT "/%s/vendor", module);
unlink(buf2);
xsymlink("./system/vendor", buf2);
}
// If /system/product exists in module, create a link outside
strcpy(name, "system/product");
if (node_entry::product_root && access(buf, F_OK) == 0) {
snprintf(buf2, sizeof(buf2), "%s/%s/product", MODULEROOT, module);
strcpy(b1, "system/product");
if (node_entry::product_root && access(buf1, F_OK) == 0) {
sprintf(buf2, MODULEROOT "/%s/product", module);
unlink(buf2);
xsymlink("./system/product", buf2);
}
@ -729,14 +744,6 @@ void late_start(int client) {
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();
LOGI("* Running service.d scripts\n");

26
native/jni/core/daemon.cpp
View File

@ -4,6 +4,7 @@
#include <string.h>
#include <pthread.h>
#include <signal.h>
#include <libgen.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/mount.h>
@ -16,8 +17,11 @@
#include <resetprop.hpp>
#include <flags.h>
using namespace std;
int SDK_INT = -1;
bool RECOVERY_MODE = false;
string MAGISKTMP;
static struct stat self_st;
static void verify_client(int client, pid_t pid) {
@ -91,6 +95,10 @@ static void *request_handler(void *args) {
}
close(client);
break;
case GET_PATH:
write_string(client, MAGISKTMP.data());
close(client);
break;
default:
close(client);
break;
@ -114,11 +122,19 @@ static void main_daemon() {
setsid();
setcon("u:r:" SEPOL_PROC_DOMAIN ":s0");
// Get self stat
char path[4096];
xreadlink("/proc/self/exe", path, sizeof(path));
MAGISKTMP = dirname(path);
xstat("/proc/self/exe", &self_st);
restore_rootcon();
// Unmount pre-init patches
if (access(ROOTMNT, F_OK) == 0) {
file_readline(true, ROOTMNT, [](auto line) -> bool {
auto mount_list = MAGISKTMP + "/" ROOTMNT;
if (access(mount_list.data(), F_OK) == 0) {
file_readline(true, mount_list.data(), [](string_view line) -> bool {
umount2(line.data(), MNT_DETACH);
return true;
});
@ -126,9 +142,6 @@ static void main_daemon() {
LOGI(NAME_WITH_VER(Magisk) " daemon started\n");
// Get server stat
stat("/proc/self/exe", &self_st);
// Get API level
parse_prop_file("/system/build.prop", [](auto key, auto val) -> bool {
if (key == "ro.build.version.sdk") {
@ -148,7 +161,8 @@ static void main_daemon() {
}
// Load config status
parse_prop_file(MAGISKTMP "/config", [](auto key, auto val) -> bool {
auto config = MAGISKTMP + "/" INTLROOT "/config";
parse_prop_file(config.data(), [](auto key, auto val) -> bool {
if (key == "RECOVERYMODE" && val == "true")
RECOVERY_MODE = true;
return true;

8
native/jni/core/magisk.cpp
View File

@ -37,7 +37,7 @@ Advanced Options (Internal APIs):
--clone-attr SRC DEST clone permission, owner, and selinux context
--clone SRC DEST clone SRC to DEST
--sqlite SQL exec SQL commands to Magisk database
--path print internal tmpfs mount path
--path print Magisk tmpfs mount path
Available applets:
)EOF");
@ -116,8 +116,10 @@ int magisk_main(int argc, char *argv[]) {
write_int(fd, REMOVE_MODULES);
return read_int(fd);
} else if (argv[1] == "--path"sv) {
// TODO: hardcode /sbin for now, actual logic will be used for Android 11
printf("/sbin\n");
int fd = connect_daemon();
write_int(fd, GET_PATH);
char *path = read_string(fd);
printf("%s\n", path);
return 0;
}
#if 0

15
native/jni/core/restorecon.cpp
View File

@ -81,20 +81,17 @@ void restorecon() {
}
void restore_rootcon() {
setfilecon("/sbin", ROOT_CON);
setfilecon(MAGISKTMP, ROOT_CON);
setfilecon(MIRRDIR, ROOT_CON);
setfilecon(BLOCKDIR, ROOT_CON);
setfilecon(MAGISKTMP.data(), ROOT_CON);
auto dir = xopen_dir("/sbin");
auto dir = xopen_dir(MAGISKTMP.data());
int dfd = dirfd(dir.get());
for (dirent *entry; (entry = xreaddir(dir.get()));) {
if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue;
setfilecon_at(dfd, entry->d_name, ROOT_CON);
if (entry->d_name == "magisk"sv || entry->d_name == "magiskinit"sv)
setfilecon_at(dfd, entry->d_name, MAGISK_CON);
else
setfilecon_at(dfd, entry->d_name, ROOT_CON);
}
setfilecon("/sbin/magisk", MAGISK_CON);
setfilecon("/sbin/magiskinit", MAGISK_CON);
}

5
native/jni/core/socket.cpp
View File

@ -1,12 +1,9 @@
/* socket.c - All socket related operations
*/
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <endian.h>
#include <daemon.hpp>
#include <socket.hpp>
#include <utils.hpp>
#include <logging.hpp>

24
native/jni/include/daemon.hpp
View File

@ -1,11 +1,11 @@
#pragma once
#include <pthread.h>
#include <sys/un.h>
#include <sys/socket.h>
#include <string>
#include <vector>
#include <socket.hpp>
// Commands require connecting to daemon
enum {
DO_NOTHING = 0,
@ -18,6 +18,7 @@ enum {
MAGISKHIDE,
SQLITE_CMD,
REMOVE_MODULES,
GET_PATH,
};
// Return codes for daemon
@ -32,25 +33,6 @@ enum {
int connect_daemon(bool create = false);
// socket.cpp
socklen_t setup_sockaddr(struct sockaddr_un *sun, const char *name);
int create_rand_socket(struct sockaddr_un *sun);
int socket_accept(int sockfd, int timeout);
void get_client_cred(int fd, struct ucred *cred);
int recv_fd(int sockfd);
void send_fd(int sockfd, int fd);
int read_int(int fd);
int read_int_be(int fd);
void write_int(int fd, int val);
void write_int_be(int fd, int val);
char *read_string(int fd);
char *read_string_be(int fd);
void write_string(int fd, const char *val);
void write_string_be(int fd, const char *val);
void write_key_value(int fd, const char *key, const char *val);
void write_key_token(int fd, const char *key, int tok);
/***************
* Boot Stages *
***************/

18
native/jni/include/magisk.hpp
View File

@ -1,19 +1,13 @@
#pragma once
#include <logging.hpp>
#include <string>
#define MAIN_SOCKET "d30138f2310a9fb9c54a3e0c21f58591"
#define JAVA_PACKAGE_NAME "com.topjohnwu.magisk"
#define LOGFILE "/cache/magisk.log"
#define UNBLOCKFILE "/dev/.magisk_unblock"
#define DISABLEFILE "/cache/.disable_magisk"
#define MAGISKTMP "/sbin/.magisk"
#define MIRRDIR MAGISKTMP "/mirror"
#define BLOCKDIR MAGISKTMP "/block"
#define BBPATH MAGISKTMP "/busybox"
#define MODULEMNT MAGISKTMP "/modules"
#define ROOTOVL MAGISKTMP "/rootdir"
#define ROOTMNT ROOTOVL "/.mount_list"
#define SECURE_DIR "/data/adb"
#define MODULEROOT SECURE_DIR "/modules"
#define MODULEUPGRADE SECURE_DIR "/modules_update"
@ -21,6 +15,16 @@
#define MAGISKDB SECURE_DIR "/magisk.db"
#define MANAGERAPK DATABIN "/magisk.apk"
// tmpfs paths
extern std::string MAGISKTMP;
#define INTLROOT ".magisk"
#define MIRRDIR INTLROOT "/mirror"
#define BLOCKDIR INTLROOT "/block"
#define MODULEMNT INTLROOT "/modules"
#define BBPATH INTLROOT "/busybox"
#define ROOTOVL INTLROOT "/rootdir"
#define ROOTMNT ROOTOVL "/.mount_list"
constexpr const char *applet_names[] = { "su", "resetprop", "magiskhide", nullptr };
// Multi-call entrypoints

21
native/jni/include/socket.hpp Normal file
View File

@ -0,0 +1,21 @@
#pragma once
#include <sys/un.h>
#include <sys/socket.h>
socklen_t setup_sockaddr(struct sockaddr_un *sun, const char *name);
int create_rand_socket(struct sockaddr_un *sun);
int socket_accept(int sockfd, int timeout);
void get_client_cred(int fd, struct ucred *cred);
int recv_fd(int sockfd);
void send_fd(int sockfd, int fd);
int read_int(int fd);
int read_int_be(int fd);
void write_int(int fd, int val);
void write_int_be(int fd, int val);
char *read_string(int fd);
char *read_string_be(int fd);
void write_string(int fd, const char *val);
void write_string_be(int fd, const char *val);
void write_key_value(int fd, const char *key, const char *val);
void write_key_token(int fd, const char *key, int tok);

39
native/jni/init/init.hpp
View File

@ -5,7 +5,7 @@
#include <stdlib.h>
#include <vector>
#include <magisk.hpp>
#include <logging.hpp>
struct cmdline {
bool skip_initramfs;
@ -57,26 +57,25 @@ public:
class MagiskInit : public BaseInit {
protected:
raw_data self;
const char *persist_dir;
std::string persist_dir;
virtual void early_mount() = 0;
bool patch_sepolicy(const char *file = "/sepolicy");
public:
MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {}
};
class SARBase : public MagiskInit {
protected:
raw_data config;
std::vector<raw_file> overlays;
std::string tmp_dir;
void backup_files();
void patch_rootdir();
void mount_system_root();
public:
SARBase(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {
persist_dir = MIRRDIR "/persist/magisk";
}
SARBase(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {}
void start() override {
early_mount();
patch_rootdir();
@ -92,7 +91,9 @@ class ForcedFirstStageInit : public BaseInit {
private:
void prepare();
public:
ForcedFirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
ForcedFirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
};
void start() override {
prepare();
exec_init("/system/bin/init");
@ -103,7 +104,9 @@ class FirstStageInit : public BaseInit {
private:
void prepare();
public:
FirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
FirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
};
void start() override {
prepare();
exec_init();
@ -116,7 +119,9 @@ private:
protected:
void early_mount() override;
public:
SARFirstStageInit(char *argv[], cmdline *cmd) : SARBase(argv, cmd) {};
SARFirstStageInit(char *argv[], cmdline *cmd) : SARBase(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
};
void start() override {
early_mount();
traced_exec_init();
@ -128,7 +133,9 @@ protected:
void early_mount() override;
void cleanup() override { /* Do not do any cleanup */ }
public:
SecondStageInit(char *argv[]) : SARBase(argv, nullptr) {};
SecondStageInit(char *argv[]) : SARBase(argv, nullptr) {
LOGD("%s\n", __FUNCTION__);
};
};
/* ***********
@ -139,7 +146,9 @@ class SARInit : public SARBase {
protected:
void early_mount() override;
public:
SARInit(char *argv[], cmdline *cmd) : SARBase(argv, cmd) {};
SARInit(char *argv[], cmdline *cmd) : SARBase(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
};
};
/* **********
@ -148,13 +157,12 @@ public:
class RootFSInit : public MagiskInit {
private:
int root = -1;
void setup_rootfs();
protected:
void early_mount() override;
public:
RootFSInit(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {
persist_dir = "/dev/mnt/persist/magisk";
LOGD("%s\n", __FUNCTION__);
}
void start() override {
@ -164,9 +172,10 @@ public:
}
};
#define INIT_SOCKET "MAGISKINIT"
void load_kernel_info(cmdline *cmd);
int dump_magisk(const char *path, mode_t mode);
int magisk_proxy_main(int argc, char *argv[]);
void setup_klog();
void mount_sbin();
socklen_t setup_sockaddr(struct sockaddr_un *sun);
void setup_tmp(const char *path, const raw_data &self, const raw_data &config);

43
native/jni/init/mount.cpp
View File

@ -175,7 +175,6 @@ void RootFSInit::early_mount() {
full_read("/init", self.buf, self.sz);
LOGD("Reverting /init\n");
root = xopen("/", O_RDONLY | O_CLOEXEC);
rename("/.backup/init", "/init");
mount_root(system);
@ -186,7 +185,7 @@ void RootFSInit::early_mount() {
xmkdir("/dev/mnt", 0755);
mount_persist("/dev/block", "/dev/mnt");
mount_list.emplace_back("/dev/mnt/persist");
mount_list.emplace_back("/dev/mnt/cache");
persist_dir = "/dev/mnt/persist/magisk";
}
void SARBase::backup_files() {
@ -261,13 +260,45 @@ void BaseInit::cleanup() {
mount_list.shrink_to_fit();
}
void mount_sbin() {
LOGD("Mount /sbin tmpfs overlay\n");
xmount("tmpfs", "/sbin", "tmpfs", 0, "mode=755");
static void patch_socket_name(const char *path) {
char *buf;
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(buf + i, 16);
i += sizeof(MAIN_SOCKET);
}
}
munmap(buf, size);
}
xmkdir(MAGISKTMP, 0755);
void setup_tmp(const char *path, const raw_data &self, const raw_data &config) {
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_persist(BLOCKDIR, MIRRDIR);
int fd = xopen(INTLROOT "/config", O_WRONLY | O_CREAT, 0);
xwrite(fd, config.buf, config.sz);
close(fd);
fd = xopen("magiskinit", O_WRONLY | O_CREAT, 0755);
xwrite(fd, self.buf, self.sz);
close(fd);
dump_magisk("magisk", 0755);
patch_socket_name("magisk");
// Create applet symlinks
for (int i = 0; applet_names[i]; ++i)
xsymlink("./magisk", applet_names[i]);
xsymlink("./magiskinit", "magiskpolicy");
xsymlink("./magiskinit", "supolicy");
chdir("/");
}

95
native/jni/init/rootdir.cpp
View File

@ -6,6 +6,7 @@
#include <magisk.hpp>
#include <magiskpolicy.hpp>
#include <utils.hpp>
#include <socket.hpp>
#include "init.hpp"
#include "magiskrc.inc"
@ -18,19 +19,6 @@
using namespace std;
static void patch_socket_name(const char *path) {
char *buf;
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(buf + i, 16);
i += sizeof(MAIN_SOCKET);
}
}
munmap(buf, size);
}
static vector<raw_data> rc_list;
static void patch_init_rc(FILE *rc) {
@ -153,15 +141,14 @@ bool MagiskInit::patch_sepolicy(const char *file) {
sepol_allow(SEPOL_PROC_DOMAIN, ALL, ALL, ALL);
// Custom rules
if (auto dir = xopen_dir(persist_dir); dir) {
char path[4096];
if (auto dir = xopen_dir(persist_dir.data()); dir) {
for (dirent *entry; (entry = xreaddir(dir.get()));) {
if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue;
snprintf(path, sizeof(path), "%s/%s/sepolicy.rule", persist_dir, entry->d_name);
if (access(path, R_OK) == 0) {
LOGD("Loading custom sepolicy patch: %s\n", path);
load_rule_file(path);
auto rule = persist_dir + "/" + entry->d_name + "/sepolicy.rule";
if (access(rule.data(), R_OK) == 0) {
LOGD("Loading custom sepolicy patch: %s\n", rule.data());
load_rule_file(rule.data());
}
}
}
@ -178,30 +165,6 @@ bool MagiskInit::patch_sepolicy(const char *file) {
return patch_init;
}
static void sbin_overlay(const raw_data &self, const raw_data &config) {
mount_sbin();
// Dump binaries
xmkdir(MAGISKTMP, 0755);
int fd = xopen(MAGISKTMP "/config", O_WRONLY | O_CREAT, 0000);
xwrite(fd, config.buf, config.sz);
close(fd);
fd = xopen("/sbin/magiskinit", O_WRONLY | O_CREAT, 0755);
xwrite(fd, self.buf, self.sz);
close(fd);
dump_magisk("/sbin/magisk", 0755);
patch_socket_name("/sbin/magisk");
// Create applet symlinks
char path[64];
for (int i = 0; applet_names[i]; ++i) {
sprintf(path, "/sbin/%s", applet_names[i]);
xsymlink("./magisk", path);
}
xsymlink("./magiskinit", "/sbin/magiskpolicy");
xsymlink("./magiskinit", "/sbin/supolicy");
}
static void recreate_sbin(const char *mirror, bool use_bind_mount) {
auto dp = xopen_dir(mirror);
int src = dirfd(dp.get());
@ -233,12 +196,6 @@ static void recreate_sbin(const char *mirror, bool use_bind_mount) {
}
}
#define ROOTMIR MIRRDIR "/system_root"
#define ROOTBLK BLOCKDIR "/system_root"
#define MONOPOLICY "/sepolicy"
#define PATCHPOLICY "/sbin/.se"
#define LIBSELINUX "/system/" LIBNAME "/libselinux.so"
static string magic_mount_list;
static void magic_mount(const string &sdir, const string &ddir = "") {
@ -262,8 +219,20 @@ static void magic_mount(const string &sdir, const string &ddir = "") {
}
}
#define ROOTMIR MIRRDIR "/system_root"
#define ROOTBLK BLOCKDIR "/system_root"
#define MONOPOLICY "/sepolicy"
#define PATCHPOLICY "/sbin/.se"
#define LIBSELINUX "/system/" LIBNAME "/libselinux.so"
void SARBase::patch_rootdir() {
sbin_overlay(self, config);
// TODO: dynamic paths
tmp_dir = "/sbin";
setup_tmp(tmp_dir.data(), self, config);
persist_dir = tmp_dir + "/" MIRRDIR "/persist";
chdir(tmp_dir.data());
// Mount system_root mirror
struct stat st;
@ -273,8 +242,9 @@ void SARBase::patch_rootdir() {
if (xmount(ROOTBLK, ROOTMIR, "ext4", MS_RDONLY, nullptr))
xmount(ROOTBLK, ROOTMIR, "erofs", MS_RDONLY, nullptr);
// Recreate original sbin structure
recreate_sbin(ROOTMIR "/sbin", true);
// Recreate original sbin structure if necessary
if (tmp_dir == "/sbin")
recreate_sbin(ROOTMIR "/sbin", true);
// Patch init
raw_data init;
@ -332,20 +302,21 @@ void SARBase::patch_rootdir() {
patch_sepolicy(PATCHPOLICY);
// Handle overlay
struct sockaddr_un sun{};
socklen_t len = setup_sockaddr(&sun);
int socketfd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (connect(socketfd, (struct sockaddr*) &sun, len) == 0) {
struct sockaddr_un sun;
int sockfd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (connect(sockfd, (struct sockaddr*) &sun, setup_sockaddr(&sun, INIT_SOCKET)) == 0) {
LOGD("ACK init tracer to write backup files\n");
// Let tracer know where tmp_dir is
write_string(sockfd, tmp_dir.data());
// Wait for tracer to finish copying files
int ack;
// Wait for init tracer finish copying files
read(socketfd, &ack, sizeof(ack));
read(sockfd, &ack, sizeof(ack));
} else {
LOGD("Restore backup files locally\n");
restore_folder(ROOTOVL, overlays);
overlays.clear();
}
close(socketfd);
close(sockfd);
if (access(ROOTOVL "/sbin", F_OK) == 0) {
file_attr a;
getattr("/sbin", &a);
@ -362,9 +333,11 @@ void SARBase::patch_rootdir() {
// Mount rootdir
magic_mount(ROOTOVL);
dest = xopen(ROOTMNT, O_WRONLY | O_CREAT | O_CLOEXEC);
dest = xopen(ROOTMNT, O_WRONLY | O_CREAT | O_CLOEXEC, 0);
write(dest, magic_mount_list.data(), magic_mount_list.length());
close(dest);
chdir("/");
}
int magisk_proxy_main(int argc, char *argv[]) {
@ -381,7 +354,7 @@ int magisk_proxy_main(int argc, char *argv[]) {
unlink("/sbin/magisk");
rm_rf("/.backup");
sbin_overlay(self, config);
setup_tmp("/sbin", self, config);
// Create symlinks pointing back to /root
recreate_sbin("/root", false);

25
native/jni/init/twostage.cpp
View File

@ -1,8 +1,10 @@
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <magisk.hpp>
#include <utils.hpp>
#include <logging.hpp>
#include <socket.hpp>
#include "init.hpp"
@ -103,14 +105,6 @@ static inline long xptrace(int request, pid_t pid, void *addr = nullptr, intptr_
return xptrace(request, pid, addr, reinterpret_cast<void *>(data));
}
#define INIT_SOCKET "MAGISKINIT"
socklen_t setup_sockaddr(struct sockaddr_un *sun) {
sun->sun_family = AF_LOCAL;
strcpy(sun->sun_path + 1, INIT_SOCKET);
return sizeof(sa_family_t) + sizeof(INIT_SOCKET);
}
void SARFirstStageInit::traced_exec_init() {
int pid = getpid();
@ -132,11 +126,6 @@ void SARFirstStageInit::traced_exec_init() {
// Re-exec init
exec_init();
} else {
// Close all file descriptors and stop logging
no_logging();
for (int i = 0; i < 20; ++i)
close(i);
// Attach to parent to trace exec
xptrace(PTRACE_ATTACH, pid);
waitpid(pid, nullptr, __WALL | __WNOTHREAD);
@ -155,18 +144,22 @@ void SARFirstStageInit::traced_exec_init() {
xumount2("/dev", MNT_DETACH);
// Establish socket for 2nd stage ack
struct sockaddr_un sun{};
struct sockaddr_un sun;
int sockfd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
xbind(sockfd, (struct sockaddr*) &sun, setup_sockaddr(&sun));
xbind(sockfd, (struct sockaddr*) &sun, setup_sockaddr(&sun, INIT_SOCKET));
xlisten(sockfd, 1);
// Resume init
xptrace(PTRACE_DETACH, pid);
// Wait for second stage ack
int client = xaccept4(sockfd, nullptr, nullptr, SOCK_CLOEXEC);
// Write backup files
int cfg = xopen(MAGISKTMP "/config", O_WRONLY | O_CREAT, 0000);
char *tmp_dir = read_string(client);
chdir(tmp_dir);
free(tmp_dir);
int cfg = xopen(INTLROOT "/config", O_WRONLY | O_CREAT, 0);
xwrite(cfg, config.buf, config.sz);
close(cfg);
restore_folder(ROOTOVL, overlays);