Label /data/media with its own type and allow access.

/data/media presently is left in system_data_file, which requires
anything that wants to write to it to be able to write to system_data_file.
Introduce a new type for /data/media, media_rw_data_file (to match
the media_rw UID assigned to it and distinguish it from /data/misc/media
which has media UID and media_data_file type), and allow access to it.

We allow this for all platform app domains as WRITE_MEDIA_STORAGE permission is granted
to signature|system.  We should not have to allow it to untrusted_app.

Set up type transitions in sdcardd to automatically label any directories
or files it creates with the new type.

Change-Id: I5c7e6245b854a9213099e40a41d9583755d37d42
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
diff --git a/file_contexts b/file_contexts
index 9df91cd..817c0e0 100644
--- a/file_contexts
+++ b/file_contexts
@@ -170,6 +170,7 @@
 /data/app-private/vmdl.*\.tmp	u:object_r:apk_private_tmp_file:s0
 /data/tombstones(/.*)?	u:object_r:tombstone_data_file:s0
 /data/local/tmp(/.*)?	u:object_r:shell_data_file:s0
+/data/media(/.*)?	u:object_r:media_rw_data_file:s0
 
 # Misc data
 /data/misc/adb(/.*)?            u:object_r:adb_keys_file:s0