netdev - Re: [PATCH] net: fix infinite loop in __skb_recv

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Message-ID: <1360950210.3192.0.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Fri, 15 Feb 2013 17:43:30 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
CC:	David Miller <davem@...emloft.net>, <eric.dumazet@...il.com>,
	<tt.rantala@...il.com>, <netdev@...r.kernel.org>,
	<davej@...hat.com>, <xemul@...allels.com>
Subject: Re: [PATCH] net: fix infinite loop in __skb_recv_datagram()

On Fri, 2013-02-15 at 13:41 +0100, Hannes Frederic Sowa wrote:
> On Tue, Feb 12, 2013 at 04:07:33PM -0500, David Miller wrote:
> > From: Eric Dumazet <eric.dumazet@...il.com>
> > Date: Tue, 12 Feb 2013 08:16:53 -0800
> > 
> > > From: Eric Dumazet <edumazet@...gle.com>
> > > 
> > > Tommi was fuzzing with trinity and reported the following problem :
> > > 
> > > commit 3f518bf745 (datagram: Add offset argument to __skb_recv_datagram)
> > > missed that a raw socket receive queue can contain skbs with no payload.
> > > 
> > > We can loop in __skb_recv_datagram() with MSG_PEEK mode, because
> > > wait_for_packet() is not prepared to skip these skbs.
> >  ...
> > > Reported-by: Tommi Rantala <tt.rantala@...il.com>
> > > Tested-by: Tommi Rantala <tt.rantala@...il.com>
> > > Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> > 
> > Applied, thanks.
> 
> This issue got a CVE: http://seclists.org/oss-sec/2013/q1/310
> Perhaps it's something that should go to stable?

David has already worked that out for himself:
http://patchwork.ozlabs.org/bundle/davem/stable/?state=*

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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