traced_probes: Read tracefs directories in userdebug
Allow traced_probes to read /sys/kernel/debug/tracing
directories in userdebug mode. We read the directory when enabling
events with the wild card syntax: "oom/*" which attmpts to read the
directory /sys/kernel/debug/tracing/events/oom to work out what oom
events exist.
Denial:
avc: denied { read } for name="oom" dev="tracefs" ino=11353
scontext=u:r:traced_probes:s0
tcontext=u:object_r:debugfs_tracing_debug:s0 tclass=dir
permissive=0
Bug: 119662403
Test: perfetto -t 10s 'oom/*' -o /data/misc/perfetto-traces/trace
Change-Id: I2cb171c3c5292d2eb55e71376f965b924a563572
diff --git a/private/traced_probes.te b/private/traced_probes.te
index b0b87d8..ad6611c 100644
--- a/private/traced_probes.te
+++ b/private/traced_probes.te
@@ -18,6 +18,7 @@
# TODO(primiano): temporarily I/O tracing categories are still
# userdebug only until we nail down the blacklist/whitelist.
userdebug_or_eng(`
+allow traced_probes debugfs_tracing_debug:dir r_dir_perms;
allow traced_probes debugfs_tracing_debug:file rw_file_perms;
')