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Message-ID: <20130605135156.GF32700@dhcp-25-225.brq.redhat.com>
Date: Wed, 5 Jun 2013 15:51:56 +0200
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Cc: Marcus Meissner <meissner@...e.de>, a.p.zijlstra@...llo.nl,
eranian@...gle.com, security@...nel.org
Subject: Re: Re: CVE Request: More perf security fixes
On Tue, Jun 04, 2013 at 10:59:33AM -0700, Andi Kleen wrote:
> > 3. Information leak (??) via perf LBR filter
>
> Leak + crash actually.
>
> >
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6e15eb3ba6c0249c9e8c783517d131b47db995ca
> >
> > commit 6e15eb3ba6c0249c9e8c783517d131b47db995ca
> > Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Date: Fri May 3 14:11:24 2013 +0200
> >
> > perf/x86/intel/lbr: Fix LBR filter
> >
> > The LBR 'from' adddress is under full userspace control; ensure
> > we validate it before reading from it.
>
> This patch is known broken and causes additional crashes.
> There's no updated patch for that so far.
>
> -Andi
--
Petr Matousek / Red Hat Security Response Team
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