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SubjectRe: [PATCH] ipv4: tcp: unicast_sock should not land outside of TCP stack
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 10 Aug 2012 01:56:06 +0200

> From: Eric Dumazet <edumazet@google.com>
>
> commit be9f4a44e7d41cee (ipv4: tcp: remove per net tcp_sock) added a
> selinux regression, reported and bisected by John Stultz
>
> selinux_ip_postroute_compat() expect to find a valid sk->sk_security
> pointer, but this field is NULL for unicast_sock
>
> It turns out that unicast_sock are really temporary stuff to be able
> to reuse part of IP stack (ip_append_data()/ip_push_pending_frames())
>
> Fact is that frames sent by ip_send_unicast_reply() should be orphaned
> to not fool LSM.
>
> Note IPv6 never had this problem, as tcp_v6_send_response() doesnt use a
> fake socket at all. I'll probably implement tcp_v4_send_response() to
> remove these unicast_sock in linux-3.7
>
> Reported-by: John Stultz <johnstul@us.ibm.com>
> Bisected-by: John Stultz <johnstul@us.ibm.com>
> Signed-off-by: Eric Dumazet <edumazet@google.com>

Applied.


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