linux-kernel - Re: [PATCH 07/12] perf_events: add LBR software filter support for Intel X86

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Message-ID: <20111006153229.GJ14482@one.firstfloor.org>
Date:	Thu, 6 Oct 2011 17:32:29 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	acme@...hat.com, ming.m.lin@...el.com, andi@...stfloor.org,
	robert.richter@....com, ravitillo@....gov
Subject: Re: [PATCH 07/12] perf_events: add LBR software filter support for Intel X86

> +	kernel_insn_init(&insn, kaddr);
> +	insn_get_opcode(&insn);

This makes me uncomfortable. AFAIK that's the first use of the opcode
decoder being used directly for user space. It has a quite large attack
surface. Who says it cannot be exploited?

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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