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Introduce /data mirror

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Since we switched to imageless Magisk, module files are directly
stored in /data. However, /data is mounted with nosuid, which also
prevents SELinux typetransition to work (auto transition from one
domain to another when executing files with specific context).
This could cause serious issues when we are replacing system critical
components (e.g. app_process for Xposed), because most of them
are daemons that run in special process domains.

This commit introduced /data mirror. Using similar mirroring technique
we used for system and vendor, we mount another mirror that mounts
/data without nosuid flag. All module files are then mounted from this
mirror mountpoint instead of directly from /data.

Close #1080
This commit is contained in:
topjohnwu
2019-02-25 06:13:42 -05:00
parent 0c227f2917
commit 8032bd0bac
3 changed files with 22 additions and 21 deletions
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4
native/jni/include/magisk.h
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@@ -15,9 +15,9 @@
#define EARLYINITDONE "/dev/.magisk_early_init_done"
#define DISABLEFILE "/cache/.disable_magisk"
#define MAGISKTMP "/sbin/.magisk"
#define BLOCKDIR MAGISKTMP "/block"
#define MIRRDIR MAGISKTMP "/mirror"
#define BBPATH MAGISKTMP "/busybox"
#define MODULEMNT MAGISKTMP "/modules"
#define SECURE_DIR "/data/adb"
#define MODULEROOT SECURE_DIR "/modules"
#define MODULEUPGRADE SECURE_DIR "/modules_update"
@@ -28,7 +28,7 @@
#define MANAGERAPK DATABIN "/magisk.apk"
// Legacy crap
#define LEGACYCORE MODULEROOT "/.core"
#define LEGACYCORE MODULEROOT "/.core"
// selinux consts
#define SELINUX_PATH "/sys/fs/selinux"