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Message-ID: <20110301001348.GE5871@ksplice.com>
Date: Mon, 28 Feb 2011 19:13:48 -0500
From: Nelson Elhage <nelhage@...lice.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request: kernel: OOM-killer via argv
expansion
On Mon, Feb 28, 2011 at 03:28:47PM -0800, Kees Cook wrote:
> On Mon, Feb 28, 2011 at 01:02:02PM -0800, Kees Cook wrote:
> > On Mon, Feb 28, 2011 at 12:32:55PM -0800, Kees Cook wrote:
> > > I think the flaw[1] with argv-expansion triggering the OOM-killer
> > > incorrectly needs its own CVE.
> > >
> > > While the stack guard page and the fixes[2] for CVE-2010-3858 certainly
> > > improved things, argv expansion can still be tricked into OOM-killing the
> > > entire system. Solutions were discussed on the original thread, but
> > > were not finished. Recently a set of patches[3] has been re-proposed to fix
> > > this issue. Regardless, it should probably get its own CVE assigned.
> > >
> > > Thanks,
> > >
> > > -Kees
> > >
> > > [1] https://lkml.org/lkml/2010/8/27/429
> > > [2] http://git.kernel.org/linus/1b528181b2ffa14721fb28ad1bd539fe1732c583
> > > [3] https://lkml.org/lkml/2011/2/25/227
> >
> > Sorry, Nelson Elhage pointed out to me that I missed the fix for this
> > issue. The issue was been fixed with:
> > http://git.kernel.org/linus/3c77f845722158206a7209c45ccddc264d19319c
> >
> > This was already assigned as CVE-2010-4243
> >
> > Sorry for the noise, and thanks!
>
> Wait, I will continue to make more noise. The upstream commit
> 3c77f845722158206a7209c45ccddc264d19319c does not handle the compat case,
> which https://lkml.org/lkml/2011/2/25/227 is trying to handle.
upstream looks to have handled the compat case with:
http://git.kernel.org/linus/114279be2120a916e8a04feeb2ac976a10016f2f
>From skimming the LKML thread, I think that upstream believes the issue to be
fixed, but is trying to clean up the code, since the above two commits were
considered quick-and-dirty bandaid fixes.
- Nelson
>
> Does this need its own CVE?
>
> Thanks,
>
> -Kees
>
> --
> Kees Cook
> Ubuntu Security Team
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