Index: app_system.c
===================================================================
--- app_system.c	(revision 368031)
+++ app_system.c	(working copy)
@@ -131,9 +131,13 @@
 		pbx_builtin_setvar_helper(chan, chanvar, "FAILURE");
 		res = failmode;
 	} else if (res == 127) {
-		ast_log(LOG_WARNING, "Unable to execute '%s'\n", (char *)data);
+		ast_log(LOG_WARNING, "Unable to execute '%s': (execution failure)\n", (char *)data);
 		pbx_builtin_setvar_helper(chan, chanvar, "FAILURE");
 		res = failmode;
+        } else if (res == 126) {
+                ast_log(LOG_WARNING, "Unable to execute '%s': (permission denied)\n", (char *)data);
+                pbx_builtin_setvar_helper(chan, chanvar, "FAILURE");
+                res = failmode;
 	} else {
 		if (res < 0) 
 			res = 0;