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Date: Wed, 13 Nov 2013 12:37:03 -0700
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com, Kurt Seifried <kseifrie@...hat.com>,
        Saran.Neti@...us.com
Subject: Re: CVE-2013-4563 -- Linux kernel: net: large udp
 packet over IPv6 over UFO-enabled device with TBF qdisc panic

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On 11/13/2013 10:34 AM, Petr Matousek wrote:
> Commit 1e2bd517c108816220f262d7954b697af03b5f9c ("udp6: Fix udp 
> fragmentation for tunnel traffic.") changed the calculation if 
> there is enough space to include a fragment header in the skb from
> a skb->mac_header dervived one to skb_headroom. Because we already
> peeled off the skb to transport_header this is wrong.
> 
> This fixes a panic Saran Neti reported. He used the tbf scheduler
> which skb_gso_segments the skb. The offsets get negative and we
> panic in memcpy because the skb was erroneously not expanded at the
> head.
> 
> Introduced by: 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1e2bd517c108816220f262d7954b697af03b5f9c
>
>  Introduced in: v3.10-rc5
> 
> Upstream fix: 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0e033e0
>
>  References: 
> http://marc.info/?l=linux-netdev&m=138305762205012&w=2 
> https://bugzilla.redhat.com/show_bug.cgi?id=1030015
> 
> Acknowledgements:
> 
> Red Hat would like to thank Saran Neti of TELUS Security Labs for 
> reporting this issue.
> 
> Thanks,

One note, Petr will be handling some of the Red Hat discovered CVE
assignments for Kernel stuff, he already raises a lot of them/or I ask
him to confirm them so I figured this would be less error prone and
efficient.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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