TOMOYO: Cleanup part 1.

In order to synchronize with TOMOYO 1.8's syntax,

(1) Remove special handling for allow_read/write permission.
(2) Replace deny_rewrite/allow_rewrite permission with allow_append permission.
(3) Remove file_pattern keyword.
(4) Remove allow_read permission from exception policy.
(5) Allow creating domains in enforcing mode without calling supervisor.
(6) Add permission check for opening directory for reading.
(7) Add permission check for stat() operation.
(8) Make "cat < /sys/kernel/security/tomoyo/self_domain" behave as if
    "cat /sys/kernel/security/tomoyo/self_domain".

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

security/tomoyo/gc.c

@@ -32,27 +32,6 @@ static bool tomoyo_add_to_gc(const int type, struct list_head *element)
 	return true;
 }
 
-static void tomoyo_del_allow_read(struct list_head *element)
-{
-	struct tomoyo_readable_file *ptr =
-		container_of(element, typeof(*ptr), head.list);
-	tomoyo_put_name(ptr->filename);
-}
-
-static void tomoyo_del_file_pattern(struct list_head *element)
-{
-	struct tomoyo_no_pattern *ptr =
-		container_of(element, typeof(*ptr), head.list);
-	tomoyo_put_name(ptr->pattern);
-}
-
-static void tomoyo_del_no_rewrite(struct list_head *element)
-{
-	struct tomoyo_no_rewrite *ptr =
-		container_of(element, typeof(*ptr), head.list);
-	tomoyo_put_name(ptr->pattern);
-}
-
 static void tomoyo_del_transition_control(struct list_head *element)
 {
 	struct tomoyo_transition_control *ptr =
@@ -290,15 +269,6 @@ static void tomoyo_kfree_entry(void)
 		case TOMOYO_ID_AGGREGATOR:
 			tomoyo_del_aggregator(element);
 			break;
-		case TOMOYO_ID_GLOBALLY_READABLE:
-			tomoyo_del_allow_read(element);
-			break;
-		case TOMOYO_ID_PATTERN:
-			tomoyo_del_file_pattern(element);
-			break;
-		case TOMOYO_ID_NO_REWRITE:
-			tomoyo_del_no_rewrite(element);
-			break;
 		case TOMOYO_ID_MANAGER:
 			tomoyo_del_manager(element);
 			break;