linux-kernel - Re: [PATCH] x86: Fix insn decoder for longer instruction

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Date:	Mon, 10 Oct 2011 09:04:43 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	acme@...hat.com, ming.m.lin@...el.com, robert.richter@....com,
	ravitillo@....gov, yrl.pp-manager.tt@...achi.com,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: Re: [PATCH] x86: Fix insn decoder for longer instruction


* Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> Fix x86 insn decoder for hardening against invalid length
> instructions. This adds length checkings for each byte-read
> site and if it exceeds MAX_INSN_SIZE, returns immediately.
> This can happen when decoding user-space binary.
> 
> Caller can check whether it happened by checking insn.*.got
> member is set or not.

Thanks.

We really need the /dev/urandom based build-time tester as well.

Thanks,

	Ingo
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