Add sepolicy for starting the snapuserd daemon through init.
Restrict access to controlling snapuserd via ctl properties. Allow
update_engine to control snapuserd, and connect/write to its socket.
update_engine needs this access so it can create the appropriate dm-user
device (which sends queries to snapuserd), which is then used to build
the update snapshot.
This also fixes a bug where /dev/dm-user was not properly labelled. As a
result, snapuserd and update_engine have been granted r_dir_perms to
dm_user_device.
Bug: 168554689
Test: full ota with VABC enabled
Change-Id: I1f65ba9f16a83fe3e8ed41a594421939a256aec0
10 files changed