linux-kernel - Re: [v2.6.34-stable 050/165] TPM: Zero buffer after copying to userspace

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Date:	Fri, 17 Aug 2012 12:48:58 -0300
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	stable@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Huewe <huewe.external.infineon@...glemail.com>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	James Morris <jmorris@...ei.org>,
	Tim Gardner <tim.gardner@...onical.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Debora Velarde <debora@...ux.vnet.ibm.com>,
	Marcel Selhorst <m.selhorst@...rix.com>,
	tpmdd-devel@...ts.sourceforge.net
Subject: Re: [v2.6.34-stable 050/165] TPM: Zero buffer after copying to
 userspace

On Wed, Aug 15, 2012 at 03:46:34PM -0400, Paul Gortmaker wrote:
> From: Peter Huewe <huewe.external.infineon@...glemail.com>
> 
>                    -------------------
>     This is a commit scheduled for the next v2.6.34 longterm release.
>     http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
>     If you see a problem with using this for longterm, please comment.
>                    -------------------
> 
> commit 3321c07ae5068568cd61ac9f4ba749006a7185c9 upstream.
> 
> Since the buffer might contain security related data it might be a good idea to
> zero the buffer after we have copied it to userspace.
> 
> This got assigned CVE-2011-1162.
> 
> Signed-off-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
> Signed-off-by: James Morris <jmorris@...ei.org>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
[...]

commit 3ab1aff89477dafb1aaeafe8c8669114a02b7226 ("TPM: Zero buffer whole
after copying to userspace") is something to consider to be applied
after this, either with this update or later 2.6.34 update. It
complements this change, just fyi.

-- 
[]'s
Herton
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