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Date: Fri, 7 Sep 2012 11:36:56 +0200
From: Petr Matousek <pmatouse@...hat.com>
To: akuster <akuster@...sta.com>
Cc: oss-security@...ts.openwall.com
Subject: Re: CVE Request -- kernel: net: slab corruption due
to improper synchronization around inet->opt
Hi,
On Fri, Aug 31, 2012 at 12:37:58PM -0700, akuster wrote:
> Is there a range of affected kernel versions?
>
> Was this issue introduced by 1c32c5ad6fac8cee1a77449f5abf211e911ff830?
the race seems to be present even before this commit.
Petr
>
> - Armin
>
> On 08/31/2012 09:11 AM, Petr Matousek wrote:
> > Description of the problem:
> > Lack proper synchronization to manipulate inet->opt ip_options can lead
> > to system crash.
> >
> > Problem is that ip_make_skb() calls ip_setup_cork() and ip_setup_cork()
> > possibly makes a copy of ipc->opt (struct ip_options), without any
> > protection against another thread manipulating inet->opt. Another thread
> > can change inet->opt pointer and free old one under us.
> >
> > Given right server application (setting socket options and processing
> > traffic over the same socket at the same time), remote attacker could
> > use this flaw to crash the system. More likely though, local
> > unprivileged user could use this flaw to crash the system.
> >
> > Upstream fix:
> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=f6d8bd051c391c1c0458a30b2a7abcd939329259
> >
> > Thanks,
> >
--
Petr Matousek / Red Hat Security Response Team
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