linux-kernel - Re: Security fix for remapping of page 0 (was [PATCH] Change ZERO_SIZE

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Message-ID: <alpine.LFD.2.01.0906030918490.4880@localhost.localdomain>
Date:	Wed, 3 Jun 2009 09:19:34 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Christoph Lameter <cl@...ux-foundation.org>,
	"Larry H." <research@...reption.com>, linux-mm@...ck.org,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	pageexec@...email.hu
Subject: Re: Security fix for remapping of page 0 (was [PATCH] Change
 ZERO_SIZE_PTR to point at unmapped space)



On Wed, 3 Jun 2009, Alan Cox wrote:
> 
> Fedora at least uses SELinux to manage it. You need some kind of security
> policy engine running as a few apps really need to map low space (mostly
> for vm86)

Well, vm86 isn't even an issue on x86-64, so it's arguable that at least a 
few cases could very easily just make it more static and obvious.

			Linus
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