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selinux: add a skb_owned_by() hook

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Commit 90ba9b1986 (tcp: tcp_make_synack() can use alloc_skb())
broke certain SELinux/NetLabel configurations by no longer correctly
assigning the sock to the outgoing SYNACK packet.

Cost of atomic operations on the LISTEN socket is quite big,
and we would like it to happen only if really needed.

This patch introduces a new security_ops->skb_owned_by() method,
that is a void operation unless selinux is active.

Reported-by: Miroslav Vadkerti <[email protected]>
Diagnosed-by: Paul Moore <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: [email protected]
Acked-by: James Morris <[email protected]>
Tested-by: Paul Moore <[email protected]>
Acked-by: Paul Moore <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2013-04-08 17:58:11 +00:00 • committed by David S. Miller
commit ca10b9e9a8
5 changed files with 27 additions and 0 deletions
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1
net/ipv4/tcp_output.c
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@ -2709,6 +2709,7 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
skb_reserve(skb, MAX_TCP_HEADER);
skb_dst_set(skb, dst);
security_skb_owned_by(skb, sk);
mss = dst_metric_advmss(dst);
if (tp->rx_opt.user_mss && tp->rx_opt.user_mss < mss)