KEYS: Flag dead keys to induce EKEYREVOKED [try torvalds#6]

Set the KEY_FLAG_DEAD flag on keys for which the type has been removed. This causes the key_permission() function to return EKEYREVOKED in response to various commands. It does not, however, prevent unlinking or clearing of keyrings from detaching the key. Signed-off-by: David Howells <[email protected]> Acked-by: Serge Hallyn <[email protected]> Signed-off-by: James Morris <[email protected]>
goeke · Sep 2, 2009 · f041ae2 · f041ae2
1 parent 0c2c9a3
commit f041ae2
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/security/keys/key.c b/security/keys/key.c
@@ -956,8 +956,10 @@ void unregister_key_type(struct key_type *ktype)
 	for (_n = rb_first(&key_serial_tree); _n; _n = rb_next(_n)) {
 		key = rb_entry(_n, struct key, serial_node);
 
-		if (key->type == ktype)
+		if (key->type == ktype) {
 			key->type = &key_type_dead;
+			set_bit(KEY_FLAG_DEAD, &key->flags);
+		}
 	}
 
 	spin_unlock(&key_serial_lock);