Commit 94c4554b authored by David Howells's avatar David Howells

KEYS: Fix race between key destruction and finding a keyring by name

There appears to be a race between:

 (1) key_gc_unused_keys() which frees key->security and then calls
     keyring_destroy() to unlink the name from the name list

 (2) find_keyring_by_name() which calls key_permission(), thus accessing
     key->security, on a key before checking to see whether the key usage is 0
     (ie. the key is dead and might be cleaned up).

Fix this by calling ->destroy() before cleaning up the core key data -
including key->security.
Reported-by: default avatarPetr Matousek <pmatouse@redhat.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent ced255c0
...@@ -134,6 +134,10 @@ static noinline void key_gc_unused_keys(struct list_head *keys) ...@@ -134,6 +134,10 @@ static noinline void key_gc_unused_keys(struct list_head *keys)
kdebug("- %u", key->serial); kdebug("- %u", key->serial);
key_check(key); key_check(key);
/* Throw away the key data */
if (key->type->destroy)
key->type->destroy(key);
security_key_free(key); security_key_free(key);
/* deal with the user's key tracking and quota */ /* deal with the user's key tracking and quota */
...@@ -148,10 +152,6 @@ static noinline void key_gc_unused_keys(struct list_head *keys) ...@@ -148,10 +152,6 @@ static noinline void key_gc_unused_keys(struct list_head *keys)
if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags))
atomic_dec(&key->user->nikeys); atomic_dec(&key->user->nikeys);
/* now throw away the key memory */
if (key->type->destroy)
key->type->destroy(key);
key_user_put(key->user); key_user_put(key->user);
kfree(key->description); kfree(key->description);
......
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