linux-kernel - Re: [PATCH 1/2] Fix perf LBR filtering

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Message-ID: <20130425164100.GC16732@two.firstfloor.org>
Date:	Thu, 25 Apr 2013 18:41:00 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>, mingo@...nel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	eranian@...gle.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/2] Fix perf LBR filtering

> So why not do the same as we do for userspace? Copy MAX_INSN_SIZE bytes
> and trap -EFAULT.

Read the whole description, then you'll know why that is insecure.

-Andi
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