diff --git a/private/app.te b/private/app.te
index f21887e928760cfe17f188e08ede35dc4f1bc776..ed2d8b6081fd72a94adbd7c12700280c4a1db34a 100644
--- a/private/app.te
+++ b/private/app.te
@@ -87,11 +87,12 @@ allow appdomain oemfs:file rx_file_perms;
 
 # Execute the shell or other system executables.
 allow { appdomain -ephemeral_app -untrusted_v2_app } shell_exec:file rx_file_perms;
-allow { appdomain -ephemeral_app -untrusted_v2_app } system_file:file rx_file_perms;
+allow { appdomain -ephemeral_app -untrusted_v2_app } system_file:file x_file_perms;
 allow { appdomain -ephemeral_app -untrusted_v2_app } toolbox_exec:file rx_file_perms;
 
 # Renderscript needs the ability to read directories on /system
-r_dir_file(appdomain, system_file)
+allow appdomain system_file:dir r_dir_perms;
+allow appdomain system_file:lnk_file { getattr open read };
 
 # Execute dex2oat when apps call dexclassloader
 allow appdomain dex2oat_exec:file rx_file_perms;
diff --git a/private/app_neverallows.te b/private/app_neverallows.te
index 15ab764c48b94b297ac957aa21f1e18b809e3991..5e47b68db0b07bdfdbda50746648ab6ed2a1ad93 100644
--- a/private/app_neverallows.te
+++ b/private/app_neverallows.te
@@ -100,3 +100,7 @@ neverallow all_untrusted_apps proc:file { no_rw_file_perms no_x_file_perms };
 
 # Do not allow untrusted apps access to preloads data files
 neverallow all_untrusted_apps preloads_data_file:file no_rw_file_perms;
+
+# Locking of files on /system could lead to denial of service attacks
+# against privileged system components
+neverallow all_untrusted_apps system_file:file lock;