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Support custom legacy Sony devices with init.real setup

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Custom ROM bring-ups of legacy Sony devices contain the following:
/init (symlink to /bin/init_sony)
/init.real (the "real" Android init)
/bin/init_sony (this was /sbin/init_sony on Android <11)

Kernel loads the ramdisk and starts /init -> /bin/init_sony
/bin/init_sony does low-level device setup (see: https://github.com/LineageOS/android_device_sony_common/blob/lineage-18.1/init/init_main.cpp)
/bin/init_sony unlinks /init and renames /init.real to /init
/bin/init_sony starts /init

Since init_sony needs to run first magiskinit needs to replace init.real instead, so add workarounds based on detection of init.real to boot patcher and uninstaller

Thanks @115ek and @bleckdeth

Fixes #3636

Co-authored-by: topjohnwu <topjohnwu@gmail.com>
This commit is contained in:
Chris Renshaw
2021-10-30 22:59:20 -03:00
committed by GitHub
parent 2c44e1bb93
commit 6663fd3526
9 changed files with 41 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
native/jni/init/getinfo.cpp
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@@ -252,6 +252,12 @@ bool check_two_stage() {
if (access("/system/bin/init", F_OK) == 0)
return true;
// If we still have no indication, parse the original init and see what's up
auto init = mmap_data::ro("/.backup/init");
auto init = mmap_data::ro(backup_init());
return init.contains("selinux_setup");
}
const char *backup_init() {
if (access("/.backup/init.real", F_OK) == 0)
return "/.backup/init.real";
return "/.backup/init";
}

2
native/jni/init/init.cpp
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@@ -59,7 +59,7 @@ public:
RecoveryInit(char *argv[], BootConfig *cmd) : BaseInit(argv, cmd) {}
void start() override {
LOGD("Ramdisk is recovery, abort\n");
rename("/.backup/init", "/init");
rename(backup_init(), "/init");
rm_rf("/.backup");
exec_init();
}

1
native/jni/init/init.hpp
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@@ -40,6 +40,7 @@ bool unxz(int fd, const uint8_t *buf, size_t size);
void load_kernel_info(BootConfig *config);
bool check_two_stage();
void setup_klog();
const char *backup_init();
/***************
* Base classes

2
native/jni/init/mount.cpp
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@@ -289,7 +289,7 @@ void RootFSInit::early_mount() {
self = mmap_data::ro("/init");
LOGD("Restoring /init\n");
rename("/.backup/init", "/init");
rename(backup_init(), "/init");
mount_with_dt();
}

4
native/jni/init/twostage.cpp
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@@ -61,7 +61,7 @@ void FirstStageInit::prepare() {
xmkdirs(FSR "/system/bin", 0755);
rename("/init" /* magiskinit */, FSR "/system/bin/init");
symlink("/system/bin/init", FSR "/init");
rename("/.backup/init", "/init");
rename(backup_init(), "/init");
rename("/.backup", FSR "/.backup");
rename("/overlay.d", FSR "/overlay.d");
@@ -71,7 +71,7 @@ void FirstStageInit::prepare() {
xmkdir("/system", 0755);
xmkdir("/system/bin", 0755);
rename("/init" /* magiskinit */ , "/system/bin/init");
rename("/.backup/init", "/init");
rename(backup_init(), "/init");
}
char fstab_file[128];