diff options
| author | David S. Miller <davem@davemloft.net> | 2011-01-05 15:38:53 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-01-05 15:38:53 -0800 |
| commit | 3610cda53f247e176bcbb7a7cca64bc53b12acdb (patch) | |
| tree | d780bc1e405116e75a194b2f4693a6f9bbe9f58f /security/smack | |
| parent | 44b8288308ac9da27eab7d7bdbf1375a568805c3 (diff) | |
af_unix: Avoid socket->sk NULL OOPS in stream connect security hooks.
unix_release() can asynchornously set socket->sk to NULL, and
it does so without holding the unix_state_lock() on "other"
during stream connects.
However, the reverse mapping, sk->sk_socket, is only transitioned
to NULL under the unix_state_lock().
Therefore make the security hooks follow the reverse mapping instead
of the forward mapping.
Reported-by: Jeremy Fitzhardinge <jeremy@goop.org>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'security/smack')
| -rw-r--r-- | security/smack/smack_lsm.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 489a85afa47..ccb71a044a1 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -2408,22 +2408,22 @@ static int smack_setprocattr(struct task_struct *p, char *name, /** * smack_unix_stream_connect - Smack access on UDS - * @sock: one socket - * @other: the other socket + * @sock: one sock + * @other: the other sock * @newsk: unused * * Return 0 if a subject with the smack of sock could access * an object with the smack of other, otherwise an error code */ -static int smack_unix_stream_connect(struct socket *sock, - struct socket *other, struct sock *newsk) +static int smack_unix_stream_connect(struct sock *sock, + struct sock *other, struct sock *newsk) { - struct inode *sp = SOCK_INODE(sock); - struct inode *op = SOCK_INODE(other); + struct inode *sp = SOCK_INODE(sock->sk_socket); + struct inode *op = SOCK_INODE(other->sk_socket); struct smk_audit_info ad; smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); - smk_ad_setfield_u_net_sk(&ad, other->sk); + smk_ad_setfield_u_net_sk(&ad, other); return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_READWRITE, &ad); } |