linux-kernel - Re: NULL pointer dereference in selinux_ip_postroute

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Message-ID: <1344522472.28967.936.camel@edumazet-glaptop>
Date:	Thu, 09 Aug 2012 16:27:52 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Paul Moore <paul@...l-moore.com>
Cc:	Casey Schaufler <casey@...aufler-ca.com>,
	Eric Paris <eparis@...isplace.org>,
	John Stultz <johnstul@...ibm.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	lkml <linux-kernel@...r.kernel.org>,
	James Morris <james.l.morris@...cle.com>,
	selinux@...ho.nsa.gov, Eric Dumazet <edumazet@...gle.com>,
	john.johansen@...onical.com,
	LSM <linux-security-module@...r.kernel.org>
Subject: Re: NULL pointer dereference in selinux_ip_postroute_compat

On Thu, 2012-08-09 at 09:30 -0400, Paul Moore wrote:

> In the case of a TCP syn-recv and timewait ACK things are a little less clear.  
> Eric (Dumazet), it looks like we have a socket in tcp_v4_reqsk_send_ack() and 
> tcp_v4_timewait_ack(), any reason why we can't propagate the socket down to 
> ip_send_unicast_reply()?
> 

timewait 'sockets' are not full blown sockets.

We need a socket (well, a good part of it) to build the IP frame and
send it.



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