linux-kernel - Re: [PATCH] drm: do not leak kernel addresses via /proc/dri/*/vma

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Message-ID: <20110212220826.GA4135@outflux.net>
Date:	Sat, 12 Feb 2011 14:08:26 -0800
From:	Kees Cook <kees.cook@...onical.com>
To:	Corbin Simpson <mostawesomedude@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Dan Rosenberg <drosenberg@...curity.com>,
	Eugene Teo <eugeneteo@...nel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm: do not leak kernel addresses via /proc/dri/*/vma

Hi Corbin,

On Sat, Feb 12, 2011 at 10:13:04AM -0800, Corbin Simpson wrote:
> On Fri, Feb 11, 2011 at 7:29 PM, Kees Cook <kees.cook@...onical.com> wrote:
> > In the continuing effort to avoid kernel addresses leaking to unprivileged
> > users, this patch switches to %pK for /proc/dri/*/vma.
> 
> This is a highly reasonable patch. Does 0x%pK show up as 0x0x0 in the
> log, or just 0x0? Other than that...
> Reviewed-by: Corbin Simpson <MostAwesomeDude@...il.com>

Thanks! The default for %p (and %pK) is without the 0x prefix, and 0-padded to sizeof(void*)
character. So 0x%pK will show as 0x00000000 on 32bit to a regular user, etc.

-Kees

-- 
Kees Cook
Ubuntu Security Team
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