auditallow app_data_file execute

Executing files from an application home directory violates
W^X (https://en.wikipedia.org/wiki/W%5EX) constraints (loading executable code
from a writable file) and is an unsafe application behavior. Test to see if we
can get rid of it and establish some baseline metrics.

Test: device boots and no obvious problems.
Change-Id: I756c281fcbf750821307327642cc0d06605951b0

private/ephemeral_app.te

@@ -23,6 +23,12 @@ allow ephemeral_app { sdcard_type media_rw_data_file }:file {read write getattr
 # to their sandbox directory and then execute.
 allow ephemeral_app { app_data_file privapp_data_file }:file {r_file_perms execute};
 
+# Executing files from an application home directory violates
+# W^X (https://en.wikipedia.org/wiki/W%5EX) constraints (loading executable code
+# from a writable file) and is an unsafe application behavior. Test to see if we
+# can get rid of it.
+auditallow ephemeral_app app_data_file:file execute;
+
 # services
 allow ephemeral_app audioserver_service:service_manager find;
 allow ephemeral_app cameraserver_service:service_manager find;

private/untrusted_app_all.te

@@ -24,6 +24,12 @@
 # to their sandbox directory and then execute.
 allow untrusted_app_all { app_data_file privapp_data_file }:file { rx_file_perms };
 
+# Executing files from an application home directory violates
+# W^X (https://en.wikipedia.org/wiki/W%5EX) constraints (loading executable code
+# from a writable file) and is an unsafe application behavior. Test to see if we
+# can get rid of it.
+auditallow untrusted_app_all app_data_file:file { execute execute_no_trans };
+
 # ASEC
 allow untrusted_app_all asec_apk_file:file r_file_perms;
 allow untrusted_app_all asec_apk_file:dir r_dir_perms;