linux-kernel - RE: [PATCH v4] [x86] detect and report lack of NX protections

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Message-ID: <SNT125-W33733E48300A2E2D156865C3A90@phx.gbl>
Date:	Thu, 12 Nov 2009 10:01:44 -0800
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<kees.cook@...onical.com>
CC:	<arjan@...radead.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<x86@...nel.org>, <penberg@...helsinki.fi>, <jbeulich@...ell.com>,
	<vegardno@....uio.no>, <linux-kernel@...r.kernel.org>,
	<hpa@...or.com>
Subject: RE: [PATCH v4] [x86] detect and report lack of NX protections



>> The last column should actually be "no message", "impossible", "impossible".
>
> Ah, yes, very true.
Nope, not only can it be disabled in the BIOS, but also don't forget Intel's first D0 stepping Nocona Xeon x86-64 CPUs, which do not have NX.
> (the class of machines without PAE being
> larger than those without NX and with PAE).Nope also. Clue: Most post-Pentium Pro Intel CPUs and all AMD CPUs since the K7 has PAE available as a CPU feature.
Yuhong Bao 		 	   		  
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