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af_unix: Avoid socket->sk NULL OOPS in stream connect security hooks.

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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>
This commit is contained in:
David S. Miller
2011-01-05 15:38:53 -08:00
parent 44b8288308
commit 3610cda53f
6 changed files with 22 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
security/smack/smack_lsm.c
View File

@@ -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);
}