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Use our own device nodes for mirrors

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This commit is contained in:
topjohnwu 2019-04-07 23:03:49 -04:00
parent bc286fd4d3
commit dab32e1599
3 changed files with 17 additions and 22 deletions
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28
native/jni/core/bootstages.cpp
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@ -301,19 +301,17 @@ static int bind_mount(const char *from, const char *to, bool log) {
return ret;
}
char *system_block;
char *vendor_block;
char *data_block;
static char *&system_root_block = system_block;
#define MIRRMNT(part) MIRRDIR "/" #part
#define PARTBLK(part) BLOCKDIR "/" #part
#define MIRRPNT(part) MIRRDIR "/" #part
#define mount_mirror(part, flag) \
sscanf(line.data(), "%s %*s %s", buf, buf2); \
part##_block = strdup(buf); \
xmkdir(MIRRPNT(part), 0755); \
xmount(part##_block, MIRRPNT(part), buf2, flag, nullptr); \
VLOGI("mount", part##_block, MIRRPNT(part))
#define mount_mirror(part, flag) { \
sscanf(line.data(), "%s %*s %s", buf, buf2); \
xstat(buf, &st); \
mknod(PARTBLK(part), S_IFBLK | 0600, st.st_rdev); \
xmkdir(MIRRMNT(part), 0755); \
xmount(PARTBLK(part), MIRRMNT(part), buf2, flag, nullptr); \
VLOGI("mount", PARTBLK(part), MIRRMNT(part)); \
}
static bool magisk_env() {
LOGI("* Initializing Magisk environment\n");
@ -348,7 +346,8 @@ static bool magisk_env() {
symlink(MODULEMNT, MAGISKTMP "/img");
// Directories in tmpfs overlay
xmkdirs(MIRRPNT(system), 0755);
xmkdir(MIRRDIR, 0);
xmkdir(BLOCKDIR, 0);
xmkdir(BBPATH, 0755);
xmkdir(MODULEMNT, 0755);
@ -360,10 +359,11 @@ static bool magisk_env() {
LOGI("* Mounting mirrors");
bool system_as_root = false;
struct stat st;
file_readline("/proc/mounts", [&](string_view line) -> bool {
if (str_contains(line, " /system_root ")) {
mount_mirror(system_root, MS_RDONLY);
bind_mount(MIRRPNT(system_root) "/system", MIRRPNT(system));
xsymlink(MIRRMNT(system_root) "/system", MIRRMNT(system));
system_as_root = true;
} else if (!system_as_root && str_contains(line, " /system ")) {
mount_mirror(system, MS_RDONLY);

1
native/jni/include/magisk.h
View File

@ -11,6 +11,7 @@
#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 SECURE_DIR "/data/adb"

10
native/jni/magiskhide/proc_monitor.cpp
View File

@ -28,10 +28,6 @@
using namespace std;
extern char *system_block;
extern char *vendor_block;
extern char *data_block;
static int inotify_fd = -1;
static void term_thread(int sig = SIGTERMTHRD);
@ -202,11 +198,9 @@ static void hide_daemon(int pid) {
lazy_unmount(s.data());
targets.clear();
// Unmount everything under /system, /vendor, and data mounts
// Unmount all Magisk created mounts
file_readline("/proc/self/mounts", [&](string_view s) -> bool {
if ((str_contains(s, " /system/") || str_contains(s, " /vendor/")) &&
(str_contains(s, system_block) || str_contains(s, vendor_block) ||
str_contains(s, data_block))) {
if (str_contains(s, BLOCKDIR)) {
char *path = (char *) s.data();
// Skip first token
strtok_r(nullptr, " ", &path);