linux-kernel - Re: [PATCH] ipc: explicitly clear stack memory in user structs

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Message-ID: <20101109205008.GU5876@outflux.net>
Date:	Tue, 9 Nov 2010 12:50:08 -0800
From:	Kees Cook <kees.cook@...onical.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	"David S. Miller" <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Manfred Spraul <manfred@...orfullife.com>
Subject: Re: [PATCH] ipc: explicitly clear stack memory in user structs

Hi Pekka,

On Tue, Nov 09, 2010 at 10:43:07PM +0200, Pekka Enberg wrote:
> On Tue, Oct 26, 2010 at 2:58 AM, Kees Cook <kees.cook@...onical.com> wrote:
> > CVE-2010-4072
> >
> > The old shm interface will leak a few bytes of stack contents. Explicitly
> > clear structure using memset instead of C99-style initialization in case
> > there are ever holes in the packing.
> >
> > Cc: stable <stable@...nel.org>
> > Signed-off-by: Kees Cook <kees.cook@...onical.com>
> 
> This looks like a genuine bug fix but I don't see this patch in
> mainline. Why is that?

No one has committed it. I don't know why; I've sent it a few times now.

-Kees

-- 
Kees Cook
Ubuntu Security Team
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