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Date: Wed, 10 Nov 2010 14:44:11 -0500 (EST)
From: Josh Bressers <>
To:, Petr Matousek <>
Subject: Re: CVE request: kernel: L2TP send buffer allocation
 size overflows

Please use CVE-2010-4160.



----- "Petr Matousek" <> wrote:

> "Both PPPoL2TP (in net/l2tp/l2tp_ppp.c, pppol2tp_sendmsg()) and
> IPoL2TP (in
> net/l2tp/l2tp_ip.c, l2tp_ip_sendmsg()) make calls to sock_wmalloc()
> that
> perform arithmetic on the size argument without any maximum bound. As
> a result,
> by issuing sendto() calls with very large sizes, this allocation size
> will wrap
> and result in a small buffer being allocated, leading to ugliness
> immediately
> after (probably kernel panics due to bad sk_buff tail position, but
> possibly
> kernel heap corruption)."
> Credit: Dan Rosenberg
> Reference:
> Thanks,
> --
> Petr Matousek / Red Hat Security Response Team

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