linux-kernel - Re: i686 quirk for AMD Geode

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Message-ID: <4AFA569E.9040206@zytor.com>
Date:	Tue, 10 Nov 2009 22:15:58 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Willy Tarreau <w@....eu>
CC:	Ingo Molnar <mingo@...e.hu>, Pavel Machek <pavel@....cz>,
	Avi Kivity <avi@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Matteo Croce <technoboy85@...il.com>,
	Sven-Haegar Koch <haegar@...net.de>,
	linux-kernel@...r.kernel.org
Subject: Re: i686 quirk for AMD Geode

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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