linux-kernel - Re: [PATCH] ipv4: tcp: unicast_sock should not land outside of TCP stack

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Message-Id: <20120809.210546.819623704116134361.davem@davemloft.net>
Date:	Thu, 09 Aug 2012 21:05:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	eparis@...isplace.org, paul@...l-moore.com, casey@...aufler-ca.com,
	johnstul@...ibm.com, serge@...lyn.com,
	linux-kernel@...r.kernel.org, james.l.morris@...cle.com,
	selinux@...ho.nsa.gov, john.johansen@...onical.com,
	linux-security-module@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4: tcp: unicast_sock should not land outside of TCP
 stack

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 10 Aug 2012 01:56:06 +0200

> From: Eric Dumazet <edumazet@...gle.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@...ibm.com>
> Bisected-by: John Stultz <johnstul@...ibm.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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