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-rw-r--r--security/keys/keyring.c45
1 files changed, 35 insertions, 10 deletions
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index d80311e571c3..69f0cb7bab7e 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -1304,7 +1304,7 @@ static void keyring_revoke(struct key *keyring)
}
}
-static bool gc_iterator(void *object, void *iterator_data)
+static bool keyring_gc_select_iterator(void *object, void *iterator_data)
{
struct key *key = keyring_ptr_to_key(object);
time_t *limit = iterator_data;
@@ -1315,22 +1315,47 @@ static bool gc_iterator(void *object, void *iterator_data)
return true;
}
+static int keyring_gc_check_iterator(const void *object, void *iterator_data)
+{
+ const struct key *key = keyring_ptr_to_key(object);
+ time_t *limit = iterator_data;
+
+ key_check(key);
+ return key_is_dead(key, *limit);
+}
+
/*
- * Collect garbage from the contents of a keyring, replacing the old list with
- * a new one with the pointers all shuffled down.
+ * Garbage collect pointers from a keyring.
*
- * Dead keys are classed as oned that are flagged as being dead or are revoked,
- * expired or negative keys that were revoked or expired before the specified
- * limit.
+ * Not called with any locks held. The keyring's key struct will not be
+ * deallocated under us as only our caller may deallocate it.
*/
void keyring_gc(struct key *keyring, time_t limit)
{
- kenter("{%x,%s}", key_serial(keyring), keyring->description);
+ int result;
+
+ kenter("%x{%s}", keyring->serial, keyring->description ?: "");
+ if (keyring->flags & ((1 << KEY_FLAG_INVALIDATED) |
+ (1 << KEY_FLAG_REVOKED)))
+ goto dont_gc;
+
+ /* scan the keyring looking for dead keys */
+ rcu_read_lock();
+ result = assoc_array_iterate(&keyring->keys,
+ keyring_gc_check_iterator, &limit);
+ rcu_read_unlock();
+ if (result == true)
+ goto do_gc;
+
+dont_gc:
+ kleave(" [no gc]");
+ return;
+
+do_gc:
down_write(&keyring->sem);
assoc_array_gc(&keyring->keys, &keyring_assoc_array_ops,
- gc_iterator, &limit);
+ keyring_gc_select_iterator, &limit);
up_write(&keyring->sem);
-
- kleave("");
+ kleave(" [gc]");
}