Significantly broaden sepolicy.rule compatibility
Previously, Magisk uses persist or cache for storing modules' custom sepolicy rules. In this commit, we significantly broaden its compatibility and also prevent mounting errors. The persist partition is non-standard and also critical for Snapdragon devices, so we prefer not to use it by default. We will go through the following logic to find the best suitable non-volatile, writable location to store and load sepolicy.rule files: Unencrypted data -> FBE data unencrypted dir -> cache -> metadata -> persist This should cover almost all possible cases: very old devices have cache partitions; newer devices will use FBE; latest devices will use metadata FBE (which guarantees a metadata parition); and finally, all Snapdragon devices have the persist partition (as a last resort). Fix #3179
This commit is contained in:
topjohnwu
parent
cf47214ee4
commit
16e4c67992
@ -26,11 +26,17 @@ class LocalModule(path: String) : Module() {
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set(enable) {
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val dir = "$PERSIST/$id"
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if (enable) {
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Shell.su("mkdir -p $dir", "cp -af $ruleFile $dir").submit()
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disableFile.delete()
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if (Const.Version.isCanary())
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Shell.su("copy_sepolicy_rules").submit()
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else
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Shell.su("mkdir -p $dir", "cp -af $ruleFile $dir").submit()
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} else {
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Shell.su("rm -rf $dir").submit()
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!disableFile.createNewFile()
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if (Const.Version.isCanary())
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Shell.su("copy_sepolicy_rules").submit()
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else
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Shell.su("rm -rf $dir").submit()
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}
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}
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@ -38,11 +44,17 @@ class LocalModule(path: String) : Module() {
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get() = removeFile.exists()
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set(remove) {
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if (remove) {
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Shell.su("rm -rf $PERSIST/$id").submit()
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removeFile.createNewFile()
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if (Const.Version.isCanary())
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Shell.su("copy_sepolicy_rules").submit()
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else
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Shell.su("rm -rf $PERSIST/$id").submit()
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} else {
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Shell.su("cp -af $ruleFile $PERSIST/$id").submit()
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!removeFile.delete()
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if (Const.Version.isCanary())
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Shell.su("copy_sepolicy_rules").submit()
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else
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Shell.su("cp -af $ruleFile $PERSIST/$id").submit()
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}
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}
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@ -22,14 +22,15 @@ static bool safe_mode = false;
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* Setup *
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*********/
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#define DIR_IS(part) (me->mnt_dir == "/" #part ""sv)
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#define MNT_DIR_IS(dir) (me->mnt_dir == string_view(dir))
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#define SETMIR(b, part) sprintf(b, "%s/" MIRRDIR "/" #part, MAGISKTMP.data())
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#define SETBLK(b, part) sprintf(b, "%s/" BLOCKDIR "/" #part, MAGISKTMP.data())
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#define mount_mirror(part, flag) \
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else if (DIR_IS(part) && me->mnt_type != "tmpfs"sv && lstat(me->mnt_dir, &st) == 0) { \
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else if (MNT_DIR_IS("/" #part) && me->mnt_type != "tmpfs"sv && lstat(me->mnt_dir, &st) == 0) { \
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SETMIR(buf1, part); \
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SETBLK(buf2, part); \
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unlink(buf2); \
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mknod(buf2, S_IFBLK | 0600, st.st_dev); \
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xmkdir(buf1, 0755); \
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xmount(buf2, buf1, me->mnt_type, flag, nullptr); \
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@ -43,6 +44,16 @@ if (access("/system/" #part, F_OK) == 0 && access(buf1, F_OK) != 0) { \
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LOGI("link: %s\n", buf1); \
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}
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#define link_orig_dir(dir, part) \
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else if (MNT_DIR_IS(dir) && me->mnt_type != "tmpfs"sv) { \
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SETMIR(buf1, part); \
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rmdir(buf1); \
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xsymlink(dir, buf1); \
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LOGI("link: %s\n", buf1); \
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}
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#define link_orig(part) link_orig_dir("/" #part, part)
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static bool magisk_env() {
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LOGI("* Initializing Magisk environment\n");
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@ -98,7 +109,11 @@ static bool magisk_env() {
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mount_mirror(product, MS_RDONLY)
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mount_mirror(system_ext, MS_RDONLY)
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mount_mirror(data, 0)
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else if (SDK_INT >= 24 && DIR_IS(proc) && !strstr(me->mnt_opts, "hidepid=2")) {
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link_orig(cache)
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link_orig(metadata)
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link_orig(persist)
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link_orig_dir("/mnt/vendor/persist", persist)
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else if (SDK_INT >= 24 && MNT_DIR_IS("/proc") && !strstr(me->mnt_opts, "hidepid=2")) {
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xmount(nullptr, "/proc", nullptr, MS_REMOUNT, "hidepid=2,gid=3009");
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}
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return true;
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@ -109,9 +124,9 @@ static bool magisk_env() {
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xsymlink("./system_root/system", buf1);
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LOGI("link: %s\n", buf1);
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}
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link_mirror(vendor);
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link_mirror(product);
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link_mirror(system_ext);
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link_mirror(vendor)
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link_mirror(product)
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link_mirror(system_ext)
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// Disable/remove magiskhide, resetprop
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if (SDK_INT < 19) {
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@ -17,6 +17,7 @@
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extern std::string MAGISKTMP;
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#define INTLROOT ".magisk"
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#define MIRRDIR INTLROOT "/mirror"
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#define RULESDIR MIRRDIR "/sepolicy.rules"
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#define BLOCKDIR INTLROOT "/block"
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#define MODULEMNT INTLROOT "/modules"
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#define BBPATH INTLROOT "/busybox"
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@ -68,11 +68,12 @@ class MagiskInit : public BaseInit {
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protected:
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auto_data<HEAP> self;
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auto_data<HEAP> config;
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std::string persist_dir;
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std::string custom_rules_dir;
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void mount_with_dt();
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bool patch_sepolicy(const char *file);
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void setup_tmp(const char *path);
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void mount_rules_dir(const char *dev_base, const char *mnt_base);
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public:
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MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {}
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};
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@ -114,10 +115,11 @@ public:
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class SecondStageInit : public SARBase {
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protected:
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void early_mount() override;
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void cleanup() override { /* Do not do any cleanup */ }
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public:
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SecondStageInit(char *argv[]) : SARBase(argv, nullptr) {
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LOGD("%s\n", __FUNCTION__);
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// Do not unmount /sys and /proc
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mount_list.clear();
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};
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};
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@ -205,27 +205,89 @@ static void switch_root(const string &path) {
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frm_rf(root);
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}
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static void mount_persist(const char *dev_base, const char *mnt_base) {
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string mnt_point = mnt_base + "/persist"s;
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strcpy(blk_info.partname, "persist");
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void MagiskInit::mount_rules_dir(const char *dev_base, const char *mnt_base) {
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char path[128];
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xrealpath(dev_base, blk_info.block_dev);
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char *s = blk_info.block_dev + strlen(blk_info.block_dev);
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strcpy(s, "/persist");
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xrealpath(mnt_base, path);
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char *b = blk_info.block_dev + strlen(blk_info.block_dev);
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char *p = path + strlen(path);
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auto do_mount = [&](const char *type) -> bool {
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xmkdir(path, 0755);
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bool success = xmount(blk_info.block_dev, path, type, 0, nullptr) == 0;
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if (success)
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mount_list.emplace_back(path);
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return success;
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};
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// First try userdata
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strcpy(blk_info.partname, "userdata");
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strcpy(b, "/data");
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strcpy(p, "/data");
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if (setup_block(false) < 0) {
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// Try NVIDIA naming scheme
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strcpy(blk_info.partname, "UDA");
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if (setup_block(false) < 0)
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goto cache;
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}
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// Try to mount with either ext4 or f2fs
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// Failure means either FDE or metadata encryption
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if (!do_mount("ext4") && !do_mount("f2fs"))
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goto cache;
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strcpy(p, "/data/unencrypted");
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if (access(path, F_OK) == 0) {
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// FBE, need to use an unencrypted path
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custom_rules_dir = path + "/magisk"s;
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} else {
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// Skip if /data/adb does not exist
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strcpy(p, "/data/adb");
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if (access(path, F_OK) != 0)
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return;
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// Unencrypted, directly use module paths
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custom_rules_dir = string(mnt_base) + MODULEROOT;
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}
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goto success;
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cache:
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// Fallback to cache
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strcpy(blk_info.partname, "cache");
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strcpy(s, "/cache");
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strcpy(b, "/cache");
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strcpy(p, "/cache");
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if (setup_block(false) < 0) {
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// Try NVIDIA's BS
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// Try NVIDIA naming scheme
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strcpy(blk_info.partname, "CAC");
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if (setup_block(false) < 0)
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goto metadata;
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}
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if (!do_mount("ext4"))
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goto metadata;
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custom_rules_dir = path + "/magisk"s;
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goto success;
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metadata:
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// Fallback to metadata
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strcpy(blk_info.partname, "metadata");
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strcpy(b, "/metadata");
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strcpy(p, "/metadata");
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if (setup_block(false) < 0 || !do_mount("ext4"))
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goto persist;
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custom_rules_dir = path + "/magisk"s;
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goto success;
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persist:
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// Fallback to persist
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strcpy(blk_info.partname, "persist");
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strcpy(b, "/persist");
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strcpy(p, "/persist");
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if (setup_block(false) < 0 || !do_mount("ext4"))
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return;
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}
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xsymlink("./cache", mnt_point.data());
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mnt_point = mnt_base + "/cache"s;
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}
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xmkdir(mnt_point.data(), 0755);
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xmount(blk_info.block_dev, mnt_point.data(), "ext4", 0, nullptr);
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custom_rules_dir = path + "/magisk"s;
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success:
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// Create symlinks so we don't need to go through this logic again
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strcpy(p, "/sepolicy.rules");
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xsymlink(custom_rules_dir.data(), path);
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}
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void RootFSInit::early_mount() {
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@ -235,11 +297,6 @@ void RootFSInit::early_mount() {
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rename("/.backup/init", "/init");
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mount_with_dt();
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xmkdir("/dev/mnt", 0755);
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mount_persist("/dev/block", "/dev/mnt");
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mount_list.emplace_back("/dev/mnt/persist");
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persist_dir = "/dev/mnt/persist/magisk";
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}
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void SARBase::backup_files() {
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@ -337,8 +394,6 @@ void MagiskInit::setup_tmp(const char *path) {
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xmkdir(MIRRDIR, 0);
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xmkdir(BLOCKDIR, 0);
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mount_persist(BLOCKDIR, MIRRDIR);
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int fd = xopen(INTLROOT "/config", O_WRONLY | O_CREAT, 0);
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xwrite(fd, config.buf, config.sz);
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close(fd);
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@ -81,33 +81,6 @@ static void load_overlay_rc(const char *overlay) {
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}
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}
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void RootFSInit::setup_rootfs() {
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if (patch_sepolicy("/sepolicy")) {
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auto init = raw_data::mmap_rw("/init");
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init.patch({ make_pair(SPLIT_PLAT_CIL, "xxx") });
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}
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// Handle overlays
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if (access("/overlay.d", F_OK) == 0) {
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LOGD("Merge overlay.d\n");
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load_overlay_rc("/overlay.d");
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mv_path("/overlay.d", "/");
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}
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patch_init_rc("/init.rc", "/init.p.rc", "/sbin");
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rename("/init.p.rc", "/init.rc");
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// Create hardlink mirror of /sbin to /root
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mkdir("/root", 0750);
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clone_attr("/sbin", "/root");
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link_path("/sbin", "/root");
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// Dump magiskinit as magisk
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int fd = xopen("/sbin/magisk", O_WRONLY | O_CREAT, 0755);
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write(fd, self.buf, self.sz);
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close(fd);
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}
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bool MagiskInit::patch_sepolicy(const char *file) {
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bool patch_init = false;
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sepolicy *sepol = nullptr;
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@ -135,15 +108,17 @@ bool MagiskInit::patch_sepolicy(const char *file) {
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sepol->magisk_rules();
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// Custom rules
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if (auto dir = open_dir(persist_dir.data()); dir) {
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if (!custom_rules_dir.empty()) {
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if (auto dir = open_dir(custom_rules_dir.data())) {
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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auto rule = persist_dir + "/" + entry->d_name + "/sepolicy.rule";
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auto rule = custom_rules_dir + "/" + entry->d_name + "/sepolicy.rule";
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if (access(rule.data(), R_OK) == 0) {
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LOGD("Loading custom sepolicy patch: %s\n", rule.data());
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sepol->load_rule_file(rule.data());
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}
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}
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}
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}
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sepol->to_file(file);
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delete sepol;
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@ -229,9 +204,8 @@ void SARBase::patch_rootdir() {
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}
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setup_tmp(tmp_dir);
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persist_dir = MIRRDIR "/persist/magisk";
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chdir(tmp_dir);
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mount_rules_dir(BLOCKDIR, MIRRDIR);
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// Mount system_root mirror
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struct stat st;
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@ -317,11 +291,55 @@ void SARBase::patch_rootdir() {
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chdir("/");
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}
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#define TMP_MNTDIR "/dev/mnt"
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#define TMP_RULESDIR "/.backup/.sepolicy.rules"
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void RootFSInit::setup_rootfs() {
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// Handle custom sepolicy rules
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xmkdir(TMP_MNTDIR, 0755);
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mount_rules_dir("/dev/block", TMP_MNTDIR);
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// Preserve custom rule path
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if (!custom_rules_dir.empty()) {
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string rules_dir = "./" + custom_rules_dir.substr(sizeof(TMP_MNTDIR));
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xsymlink(rules_dir.data(), TMP_RULESDIR);
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}
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if (patch_sepolicy("/sepolicy")) {
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auto init = raw_data::mmap_rw("/init");
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init.patch({ make_pair(SPLIT_PLAT_CIL, "xxx") });
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}
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// Handle overlays
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if (access("/overlay.d", F_OK) == 0) {
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LOGD("Merge overlay.d\n");
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load_overlay_rc("/overlay.d");
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mv_path("/overlay.d", "/");
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}
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patch_init_rc("/init.rc", "/init.p.rc", "/sbin");
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rename("/init.p.rc", "/init.rc");
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// Create hardlink mirror of /sbin to /root
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mkdir("/root", 0750);
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clone_attr("/sbin", "/root");
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link_path("/sbin", "/root");
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// Dump magiskinit as magisk
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int fd = xopen("/sbin/magisk", O_WRONLY | O_CREAT, 0755);
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write(fd, self.buf, self.sz);
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close(fd);
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}
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void MagiskProxy::start() {
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// Mount rootfs as rw to do post-init rootfs patches
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xmount(nullptr, "/", nullptr, MS_REMOUNT, nullptr);
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// Backup stuffs before removing them
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self = raw_data::read("/sbin/magisk");
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config = raw_data::read("/.backup/.magisk");
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xmount(nullptr, "/", nullptr, MS_REMOUNT, nullptr);
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char custom_rules_dir[64];
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custom_rules_dir[0] = '\0';
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xreadlink(TMP_RULESDIR, custom_rules_dir, sizeof(custom_rules_dir));
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unlink("/sbin/magisk");
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rm_rf("/.backup");
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@ -331,6 +349,10 @@ void MagiskProxy::start() {
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// Create symlinks pointing back to /root
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recreate_sbin("/root", false);
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if (custom_rules_dir[0])
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xsymlink(custom_rules_dir, "/sbin/" RULESDIR);
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// Tell magiskd to remount rootfs
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setenv("REMOUNT_ROOT", "1", 1);
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execv("/sbin/magisk", argv);
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}
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@ -178,5 +178,8 @@ ui_print "- Repacking boot image"
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# Sign chromeos boot
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$CHROMEOS && sign_chromeos
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# Copy existing rules for migration
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$BOOTMODE && copy_sepolicy_rules
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# Reset any error code
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true
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@ -15,7 +15,6 @@ TMPDIR=/dev/tmp
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INSTALLER=$TMPDIR/install
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CHROMEDIR=$INSTALLER/chromeos
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PERSISTDIR=/sbin/.magisk/mirror/persist
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# Default permissions
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umask 022
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@ -36,7 +35,12 @@ setup_flashable
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print_title "Magisk Uninstaller"
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is_mounted /data || mount /data || abort "! Unable to mount /data, please uninstall with Magisk Manager"
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is_mounted /cache || mount /cache 2>/dev/null
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if ! $BOOTMODE; then
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# Mounting stuffs in recovery (best effort)
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mount_name metadata /metadata
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mount_name "cache cac" /cache
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mount_name persist /persist
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fi
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mount_partitions
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api_level_arch_detect
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@ -141,7 +145,8 @@ ui_print "- Removing Magisk files"
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rm -rf \
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/cache/*magisk* /cache/unblock /data/*magisk* /data/cache/*magisk* /data/property/*magisk* \
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/data/Magisk.apk /data/busybox /data/custom_ramdisk_patch.sh /data/adb/*magisk* \
|
||||
/data/adb/post-fs-data.d /data/adb/service.d /data/adb/modules* $PERSISTDIR/magisk 2>/dev/null
|
||||
/data/adb/post-fs-data.d /data/adb/service.d /data/adb/modules* \
|
||||
/data/unencrypted/magisk /metadata/magisk /persist/magisk /mnt/vendor/persist/magisk
|
||||
|
||||
if [ -f /system/addon.d/99-magisk.sh ]; then
|
||||
blockdev --setrw /dev/block/mapper/system$SLOT 2>/dev/null
|
||||
@ -158,7 +163,7 @@ if $BOOTMODE; then
|
||||
ui_print "********************************************"
|
||||
(sleep 8; /system/bin/reboot)&
|
||||
else
|
||||
rm -rf /data/user*/*/*magisk* /data/app/*magisk*
|
||||
rm -rf /data/data/*magisk* /data/user*/*/*magisk* /data/app/*magisk* /data/app/*/*magisk*
|
||||
recovery_cleanup
|
||||
ui_print "- Done"
|
||||
fi
|
||||
|
||||
@ -152,6 +152,7 @@ recovery_cleanup() {
|
||||
fi
|
||||
umount -l /vendor
|
||||
umount -l /persist
|
||||
umount -l /metadata
|
||||
for DIR in /apex /system /system_root; do
|
||||
if [ -L "${DIR}_link" ]; then
|
||||
rmdir $DIR
|
||||
@ -217,13 +218,13 @@ mount_name() {
|
||||
local FLAG=$3
|
||||
setup_mntpoint $POINT
|
||||
is_mounted $POINT && return
|
||||
ui_print "- Mounting $POINT"
|
||||
# First try mounting with fstab
|
||||
mount $FLAG $POINT 2>/dev/null
|
||||
if ! is_mounted $POINT; then
|
||||
local BLOCK=`find_block $PART`
|
||||
mount $FLAG $BLOCK $POINT
|
||||
local BLOCK=$(find_block $PART)
|
||||
mount $FLAG $BLOCK $POINT || return
|
||||
fi
|
||||
ui_print "- Mounting $POINT"
|
||||
}
|
||||
|
||||
# mount_ro_ensure <partname(s)> <mountpoint>
|
||||
@ -266,18 +267,6 @@ mount_partitions() {
|
||||
|
||||
# Allow /system/bin commands (dalvikvm) on Android 10+ in recovery
|
||||
$BOOTMODE || mount_apex
|
||||
|
||||
# Mount persist partition in recovery
|
||||
if ! $BOOTMODE && [ ! -z $PERSISTDIR ]; then
|
||||
# Try to mount persist
|
||||
PERSISTDIR=/persist
|
||||
mount_name persist /persist
|
||||
if ! is_mounted /persist; then
|
||||
# Fallback to cache
|
||||
mount_name "cache cac" /cache
|
||||
is_mounted /cache && PERSISTDIR=/cache || PERSISTDIR=
|
||||
fi
|
||||
fi
|
||||
}
|
||||
|
||||
# loop_setup <ext4_img>, sets LOOPDEV
|
||||
@ -575,6 +564,41 @@ run_migrations() {
|
||||
done
|
||||
}
|
||||
|
||||
copy_sepolicy_rules() {
|
||||
# Remove all existing rule folders
|
||||
rm -rf /data/unencrypted/magisk /metadata/magisk /persist/magisk /mnt/vendor/persist/magisk
|
||||
|
||||
# Find current active RULESDIR
|
||||
local RULESDIR
|
||||
local active_dir=$(magisk --path)/.magisk/mirror/sepolicy.rules
|
||||
if [ -e $active_dir ]; then
|
||||
RULESDIR=$(readlink -f $active_dir)
|
||||
elif [ -d /data/unencrypted ] && ! grep ' /data ' /proc/mounts | grep -q 'dm-'; then
|
||||
RULESDIR=/data/unencrypted/magisk
|
||||
elif grep -q ' /cache ' /proc/mounts; then
|
||||
RULESDIR=/cache/magisk
|
||||
elif grep -q ' /metadata ' /proc/mounts; then
|
||||
RULESDIR=/metadata/magisk
|
||||
elif grep -q ' /persist ' /proc/mounts; then
|
||||
RULESDIR=/persist/magisk
|
||||
elif grep -q ' /mnt/vendor/persist ' /proc/mounts; then
|
||||
RULESDIR=/mnt/vendor/persist/magisk
|
||||
else
|
||||
return
|
||||
fi
|
||||
|
||||
# Copy all enabled sepolicy.rule
|
||||
for r in /data/adb/modules*/*/sepolicy.rule; do
|
||||
[ -f "$r" ] || continue
|
||||
local MODDIR=${r%/*}
|
||||
[ -f $MODDIR/disable ] && continue
|
||||
[ -f $MODDIR/remove ] && continue
|
||||
local MODNAME=${MODDIR##*/}
|
||||
mkdir -p $RULESDIR/$MODNAME
|
||||
cp -f $r $RULESDIR/$MODNAME/sepolicy.rule
|
||||
done
|
||||
}
|
||||
|
||||
#################
|
||||
# Module Related
|
||||
#################
|
||||
@ -620,9 +644,6 @@ is_legacy_script() {
|
||||
|
||||
# Require OUTFD, ZIPFILE to be set
|
||||
install_module() {
|
||||
local PERSISTDIR
|
||||
command -v magisk >/dev/null && PERSISTDIR=$(magisk --path)/mirror/persist
|
||||
|
||||
rm -rf $TMPDIR
|
||||
mkdir -p $TMPDIR
|
||||
|
||||
@ -646,7 +667,7 @@ install_module() {
|
||||
MODPATH=$MODULEROOT/$MODID
|
||||
|
||||
# Create mod paths
|
||||
rm -rf $MODPATH 2>/dev/null
|
||||
rm -rf $MODPATH
|
||||
mkdir -p $MODPATH
|
||||
|
||||
if is_legacy_script; then
|
||||
@ -699,19 +720,15 @@ install_module() {
|
||||
fi
|
||||
|
||||
# Copy over custom sepolicy rules
|
||||
if [ -f $MODPATH/sepolicy.rule -a -e "$PERSISTDIR" ]; then
|
||||
ui_print "- Installing custom sepolicy patch"
|
||||
# Remove old recovery logs (which may be filling partition) to make room
|
||||
rm -f $PERSISTDIR/cache/recovery/*
|
||||
PERSISTMOD=$PERSISTDIR/magisk/$MODID
|
||||
mkdir -p $PERSISTMOD
|
||||
cp -af $MODPATH/sepolicy.rule $PERSISTMOD/sepolicy.rule || abort "! Insufficient partition size"
|
||||
if [ -f $MODPATH/sepolicy.rule ]; then
|
||||
ui_print "- Installing custom sepolicy rules"
|
||||
copy_sepolicy_rules
|
||||
fi
|
||||
|
||||
# Remove stuffs that don't belong to modules
|
||||
rm -rf \
|
||||
$MODPATH/system/placeholder $MODPATH/customize.sh \
|
||||
$MODPATH/README.md $MODPATH/.git* 2>/dev/null
|
||||
$MODPATH/README.md $MODPATH/.git*
|
||||
|
||||
cd /
|
||||
$BOOTMODE || recovery_cleanup
|
||||
|
||||
Loading…
Reference in New Issue
Block a user