Allow domains to read tmpfs symlinks.

Domains have the ability to read normal tmpfs files but not symlinks.
Grant this ability.  In particular, allow domains to read /mnt/sdcard.

Addresses the following denial:
type=1400 audit(0.0:19):avc: denied { read } for comm=4173796E635461736B202333 name="sdcard" dev="tmpfs" ino=7475 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:tmpfs:s0 tclass=lnk_file permissive=0

(cherry-pick of commit: 2b0b8299b2f144165290b18855a9ca256492564c)

Bug: 20755029
Change-Id: Iaa5dc278b34faf33473d3e49f92d8766ae5563c0

1 files changed, 1 insertions, 0 deletions

diff --git a/domain.te b/domain.te
index 70f8f6a..0f6c6da 100644
--- a/domain.te
+++ b/domain.te
@@ -6,6 +6,7 @@ allow domain init:process sigchld;
 # Read access to properties mapping.
 allow domain kernel:fd use;
 allow domain tmpfs:file { read getattr };
+allow domain tmpfs:lnk_file { read getattr };
 
 # Search /storage/emulated tmpfs mount.
 allow domain tmpfs:dir r_dir_perms;