linux-kernel - Re: i686 quirk for AMD Geode

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Date:	Wed, 11 Nov 2009 07:36:17 +0100
From:	Willy Tarreau <w@....eu>
To:	"H. Peter Anvin" <hpa@...or.com>
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 Tue, Nov 10, 2009 at 10:15:58PM -0800, H. Peter Anvin wrote:
> 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?!

No, just basic feeling based on implementation cost and difficulty
vs gains as I explained.

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

Even in the case of the NOPL instruction ? I clearly don't see
the potential security hole !

Willy

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