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| author | Colin Ian King <colin.king@canonical.com> | 2015-07-27 15:23:43 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-03 09:29:11 -0700 |
| commit | 4fd5dc9eece297f49f16f82422ead3a28b11ea70 (patch) | |
| tree | ba1500bf7301aa543cfad53264bd5494b25a8ccb /security | |
| parent | e47f1631376e53715e14a0d1e25421f3868f90b1 (diff) | |
| download | lwn-4fd5dc9eece297f49f16f82422ead3a28b11ea70.tar.gz lwn-4fd5dc9eece297f49f16f82422ead3a28b11ea70.zip | |
KEYS: ensure we free the assoc array edit if edit is valid
commit ca4da5dd1f99fe9c59f1709fb43e818b18ad20e0 upstream.
__key_link_end is not freeing the associated array edit structure
and this leads to a 512 byte memory leak each time an identical
existing key is added with add_key().
The reason the add_key() system call returns okay is that
key_create_or_update() calls __key_link_begin() before checking to see
whether it can update a key directly rather than adding/replacing - which
it turns out it can. Thus __key_link() is not called through
__key_instantiate_and_link() and __key_link_end() must cancel the edit.
CVE-2015-1333
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/keys/keyring.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/security/keys/keyring.c b/security/keys/keyring.c index e72548b5897e..d33437007ad2 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -1181,9 +1181,11 @@ void __key_link_end(struct key *keyring, if (index_key->type == &key_type_keyring) up_write(&keyring_serialise_link_sem); - if (edit && !edit->dead_leaf) { - key_payload_reserve(keyring, - keyring->datalen - KEYQUOTA_LINK_BYTES); + if (edit) { + if (!edit->dead_leaf) { + key_payload_reserve(keyring, + keyring->datalen - KEYQUOTA_LINK_BYTES); + } assoc_array_cancel_edit(edit); } up_write(&keyring->sem); |