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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

10
security/selinux/hooks.c
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@ -3921,18 +3921,18 @@ static int selinux_socket_shutdown(struct socket *sock, int how)
return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN);
}
static int selinux_socket_unix_stream_connect(struct socket *sock,
struct socket *other,
static int selinux_socket_unix_stream_connect(struct sock *sock,
struct sock *other,
struct sock *newsk)
{
struct sk_security_struct *sksec_sock = sock->sk->sk_security;
struct sk_security_struct *sksec_other = other->sk->sk_security;
struct sk_security_struct *sksec_sock = sock->sk_security;
struct sk_security_struct *sksec_other = other->sk_security;
struct sk_security_struct *sksec_new = newsk->sk_security;
struct common_audit_data ad;
int err;
COMMON_AUDIT_DATA_INIT(&ad, NET);
ad.u.net.sk = other->sk;
ad.u.net.sk = other;
err = avc_has_perm(sksec_sock->sid, sksec_other->sid,
sksec_other->sclass,