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Commit 22ddb0ae authored by Jiakai Zhang's avatar Jiakai Zhang
Browse files

Allow other processes to run snapshotctl through init. 

Running snapshotctl involves talking to gsid, which requires the UID to
be 0. To allow other processes to run snapshotctl without running as the
root user, this change adds system properties "sys.snapshotctl.map" and
"sys.snapshotctl.unmap" that proxy snapshotctl calls.

Bug: 311377497
Test: adb shell setprop sys.snapshotctl.map requested
Test: adb shell setprop sys.snapshotctl.unmap requested
Change-Id: Ia29dde30021a94511b8e699c2c8f3816b851bf5c
parent b2bfb972

rootdir/init.rc

+13 −0
Original line number Diff line number Diff line
@@ -1361,3 +1361,16 @@ on property:persist.device_config.mglru_native.lru_gen_config=core_and_nonleaf_y 
  write /sys/kernel/mm/lru_gen/enabled 5

on property:persist.device_config.mglru_native.lru_gen_config=all

  write /sys/kernel/mm/lru_gen/enabled 7



# Allow other processes to run `snapshotctl` through `init`. This requires

# `set_prop` permission on `snapshotctl_prop`.

on property:sys.snapshotctl.map=requested

    # "root" is needed to talk to gsid and pass its check on uid.

    # "system" is needed to write to "/dev/socket/snapuserd" to talk to

    # snapuserd.

    exec - root root system -- /system/bin/snapshotctl map

    setprop sys.snapshotctl.map "finished"



on property:sys.snapshotctl.unmap=requested

    exec - root root system -- /system/bin/snapshotctl unmap

    setprop sys.snapshotctl.unmap "finished"