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https://github.com/topjohnwu/Magisk.git
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a8c2ae223a
Previous we hexpatch /init from /system/bin/init to /data/magiskinit to redirect the second stage init. However, some devices like sony has /init that does not directly invoke /system/bin/init, and thus the hexpatch fails. In this patch, we further make use of AOSP `SwitchRoot` to help us bind mount /data/magisk to /system/bin/init after `SwitchRoot`. Two important assumption about 2SI are i) that the second stage init is always /system/bin/init and ii) that the /sdcard (path after `SwitchRoot`) is always a symlink to `/storage/self/primary`. When these assumptions hold, during first stage init (before `SwitchRoot`) we can bind mount magiskinit to /sdcard, and create a symlink /storage/self/primary to /system/system/bin/init. By these steps, during `SwitchRoot`, AOSP init will try to mount move /sdcard to /system/sdcard. And /system/sdcard is symlink to /storage/self/primary, it will try to mount move /sdcard to /storage/self/primary. And /storage/self/primary in ramfs is now a symlink that points to /system/system/bin/init, thus AOSP will try to mount move /sdcard (which is a bind mount to magiskinit) to /system/system/bin/init. After chroot done by AOSP init, we then have a magiskinit bind mount on /system/bin/init, which is the second stage init. An edge case is that some devices (like meizu) use 2SI but does not switch root. In this case, they must already have a /sdcard in the ramfs, thus we can check if /sdcard exists and fallback to hexpatch. |
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| .. | ||
| .cargo | ||
| base | ||
| boot | ||
| core | ||
| external | ||
| include | ||
| init | ||
| sepolicy | ||
| .gitignore | ||
| Android-rs.mk | ||
| Android.mk | ||
| AndroidManifest.xml | ||
| Application.mk | ||
| Cargo.lock | ||
| Cargo.toml | ||
| exported_sym.txt | ||
| lto_fix.lds | ||