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authorDavid S. Miller <davem@davemloft.net>2011-01-06 02:38:53 +0300
committerDavid S. Miller <davem@davemloft.net>2011-01-06 02:38:53 +0300
commit3610cda53f247e176bcbb7a7cca64bc53b12acdb (patch)
treed780bc1e405116e75a194b2f4693a6f9bbe9f58f /security/smack
parent44b8288308ac9da27eab7d7bdbf1375a568805c3 (diff)
downloadlinux-3610cda53f247e176bcbb7a7cca64bc53b12acdb.tar.xz
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.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 489a85afa477..ccb71a044a1a 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);
}