linux-kernel - Re: Does Linux support Data Exectiion Protection ?

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Message-ID: <20090729073645.13f72a33@infradead.org>
Date:	Wed, 29 Jul 2009 07:36:45 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Aaron Gray" <aaronngray.lists@...glemail.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: Does Linux support Data Exectiion Protection ?

On Wed, 29 Jul 2009 15:08:35 +0100
"Aaron Gray" <aaronngray.lists@...glemail.com> wrote:

> Does Linux suppoert DEP, on newer x86 CPU's ?

it does and has been for the better part of at least 5 years.

> I am wondering as this does effect alot of VM's using JIT technology
> if they are wriiten without proper code memory allocation. 

given how old our support is, all JITs seem to be working.
In addition there is a compatibility provision for legacy binaries
implemented.

>  This is a
> problem for StrongTalk and FoNC' IDC. If EP is availiable how
> configurable is it ?

just make sure you use 64 bit pagetables (either a 64 bit kernel or a
32 bit kernel with PAE support) and you get the support.

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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