Allow shell + priv_app to traverse /data/misc/perfetto-traces

This is a follow-up to r.android.com/1542764.
1. In order to allow priv_app to
   stat(/data/misc/perfetto-traces/bugreport/*) we need
   also the `search` permission to traverse the parent
   directory /data/misc/perfetto-traces.
2. Allow shell to read the new bugreport/ directory.
   shell can read bugreports anyways and this is needed
   for CTS tests.

Bug: 177761174
Bug: 177684571
Test: manual (changpa@)
Change-Id: I39d6a1c7941bcdcdc314a7538c0accfd37c52ca2
diff --git a/private/priv_app.te b/private/priv_app.te
index dde8f09..46362a0 100644
--- a/private/priv_app.te
+++ b/private/priv_app.te
@@ -72,6 +72,8 @@
 # in progress.
 allow priv_app perfetto_traces_bugreport_data_file:dir r_dir_perms;
 allow priv_app perfetto_traces_bugreport_data_file:file { getattr };
+# Required to traverse the parent dir (/data/misc/perfetto-traces).
+allow priv_app perfetto_traces_data_file:dir { search };
 
 # Allow verifier to access staged apks.
 allow priv_app { apk_tmp_file apk_private_tmp_file }:dir r_dir_perms;
diff --git a/private/shell.te b/private/shell.te
index 73aac1d..e6038b1 100644
--- a/private/shell.te
+++ b/private/shell.te
@@ -51,6 +51,9 @@
 # Allow shell to read and unlink traces stored in /data/misc/perfetto-traces.
 allow shell perfetto_traces_data_file:dir rw_dir_perms;
 allow shell perfetto_traces_data_file:file { r_file_perms unlink };
+# ... and /data/misc/perfetto-traces/bugreport/ .
+allow shell perfetto_traces_bugreport_data_file:dir rw_dir_perms;
+allow shell perfetto_traces_bugreport_data_file:file { r_file_perms unlink };
 
 # Allow shell to create/remove configs stored in /data/misc/perfetto-configs.
 allow shell perfetto_configs_data_file:dir rw_dir_perms;