Message-ID: <4AFA569E.9040206@zytor.com>
Date: Tue, 10 Nov 2009 22:15:58 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Willy Tarreau <w@1wt.eu>
CC: Ingo Molnar <mingo@elte.hu>, Pavel Machek <pavel@ucw.cz>,
       Avi Kivity <avi@redhat.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Matteo Croce <technoboy85@gmail.com>,
       Sven-Haegar Koch <haegar@sdinet.de>, linux-kernel@vger.kernel.org
Subject: Re: i686 quirk for AMD Geode
References: <4AF9C6AB.8080006@zytor.com> <20091110201602.GA26633@1wt.eu> <20091110205445.GB1407@ucw.cz> <20091110211259.GD26633@1wt.eu> <4AF9D8E2.7050205@zytor.com> <20091110220652.GE26633@1wt.eu> <4AF9E61B.5090407@zytor.com> <20091110222031.GA22911@elte.hu> <20091110224222.GA28648@1wt.eu> <4AF9ED78.3000106@zytor.com> <20091111055220.GA560@1wt.eu>
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On 11/10/2009 09:52 PM, Willy Tarreau wrote:
> 
>   - last, the probability of having an NX page just after an
>     executable one seems too tight to me to even constitute
>     an attack vector ! BTW, I'm not even certain that all CPUs
>     correctly implement this check !
> 

Do you have *any* *evidence* *whatsoever* for that assertion?!

I personally will consider something that doesn't implement proper
security check to be a potential security hole and will NAK the patch.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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