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Message-ID: <20130604175933.GD2347@tassilo.jf.intel.com>
Date: Tue, 4 Jun 2013 10:59:33 -0700
From: Andi Kleen <ak@...ux.jf.intel.com>
To: Marcus Meissner <meissner@...e.de>
Cc: OSS Security List <oss-security@...ts.openwall.com>,
a.p.zijlstra@...llo.nl, eranian@...gle.com, security@...nel.org
Subject: Re: CVE Request: More perf security fixes
> 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
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