MarcoBuster/Magisk
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Mount proper system_root mirror in magiskd

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This commit is contained in:
topjohnwu 2020-11-03 00:37:08 -08:00
parent 16e4c67992
commit 89fff4830b
2 changed files with 25 additions and 19 deletions
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32
native/jni/core/bootstages.cpp
View File

@ -26,17 +26,20 @@ static bool safe_mode = false;
#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) \
else if (MNT_DIR_IS("/" #part) && me->mnt_type != "tmpfs"sv && lstat(me->mnt_dir, &st) == 0) { \
SETMIR(buf1, part); \
SETBLK(buf2, part); \
unlink(buf2); \
mknod(buf2, S_IFBLK | 0600, st.st_dev); \
xmkdir(buf1, 0755); \
xmount(buf2, buf1, me->mnt_type, flag, nullptr); \
LOGI("mount: %s\n", buf1); \
#define do_mount_mirror(part, flag) {\
SETMIR(buf1, part); \
SETBLK(buf2, part); \
unlink(buf2); \
mknod(buf2, S_IFBLK | 0600, st.st_dev); \
xmkdir(buf1, 0755); \
xmount(buf2, buf1, me->mnt_type, flag, nullptr); \
LOGI("mount: %s\n", buf1); \
}
#define mount_mirror(part, flag) \
else if (MNT_DIR_IS("/" #part) && me->mnt_type != "tmpfs"sv && lstat(me->mnt_dir, &st) == 0) \
do_mount_mirror(part, flag)
#define link_mirror(part) \
SETMIR(buf1, part); \
if (access("/system/" #part, F_OK) == 0 && access(buf1, F_OK) != 0) { \
@ -119,10 +122,17 @@ static bool magisk_env() {
return true;
});
SETMIR(buf1, system);
SETMIR(buf2, system_root);
if (access(buf1, F_OK) != 0 && access(buf2, F_OK) == 0) {
if (access(buf1, F_OK) != 0) {
xsymlink("./system_root/system", buf1);
LOGI("link: %s\n", buf1);
parse_mnt("/proc/mounts", [&](mntent *me) {
struct stat st;
if (MNT_DIR_IS("/") && me->mnt_type != "rootfs"sv && stat("/", &st) == 0) {
do_mount_mirror(system_root, MS_RDONLY)
return false;
}
return true;
});
}
link_mirror(vendor)
link_mirror(product)

12
native/jni/init/rootdir.cpp
View File

@ -183,13 +183,12 @@ static void magic_mount(const string &sdir, const string &ddir = "") {
}
#define ROOTMIR MIRRDIR "/system_root"
#define ROOTBLK BLOCKDIR "/system_root"
#define MONOPOLICY "/sepolicy"
#define LIBSELINUX "/system/" LIBNAME "/libselinux.so"
#define NEW_INITRC "/system/etc/init/hw/init.rc"
void SARBase::patch_rootdir() {
char tmp_dir[16];
char tmp_dir[32];
const char *sepol;
char *p;
@ -208,13 +207,10 @@ void SARBase::patch_rootdir() {
mount_rules_dir(BLOCKDIR, MIRRDIR);
// Mount system_root mirror
struct stat st;
xstat("/", &st);
xmkdir(ROOTMIR, 0755);
mknod(ROOTBLK, S_IFBLK | 0600, st.st_dev);
strcpy(p, "/" ROOTBLK);
if (xmount(tmp_dir, ROOTMIR, "ext4", MS_RDONLY, nullptr))
xmount(tmp_dir, ROOTMIR, "erofs", MS_RDONLY, nullptr);
xmount("/", ROOTMIR, nullptr, MS_BIND, nullptr);
strcpy(p, "/" ROOTMIR);
mount_list.emplace_back(tmp_dir);
*p = '\0';
// Recreate original sbin structure if necessary