linux-kernel - Re: PAE problems was [RFC] Reproducible OOM with just a few sleeps

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Message-ID: <20130210190921.GA18384@amd.pavel.ucw.cz>
Date:	Sun, 10 Feb 2013 20:09:21 +0100
From:	Pavel Machek <pavel@...x.de>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Phil Turmel <philip@...mel.org>, "H. Peter Anvin" <hpa@...or.com>,
	paul.szabo@...ney.edu.au, ben@...adent.org.uk,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: PAE problems was [RFC] Reproducible OOM with just a few sleeps

On Wed 2013-02-06 16:28:08, Dave Hansen wrote:
> On 02/01/2013 02:25 AM, Pavel Machek wrote:
> > Ouch, and... IIRC (hpa should know for sure), PAE is neccessary for
> > R^X support on x86, thus getting more common, not less. If it does not
> > work, that's bad news.
> 
> Dare I ask what "R^X" is?

Read xor Execute, aka NX.... support for executable but not readable
pages. Usefull for making exploits harder iirc.
									Pavel
-- 
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