From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 25 Apr 2013 18:41:00 +0200
From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>, mingo@kernel.org,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	eranian@google.com, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 1/2] Fix perf LBR filtering
Message-ID: <20130425164100.GC16732@two.firstfloor.org>
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 <20130425162535.GA5828@dyad.programming.kicks-ass.net>
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> 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