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

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Message-ID: <7e0fb38c0906030924q73ffb387h2d20df7f8c2e75ba@mail.gmail.com>
Date:	Wed, 3 Jun 2009 12:24:03 -0400
From:	Eric Paris <eparis@...isplace.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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, Jun 3, 2009 at 12:19 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
>
> 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.

Wine does/did also use a zero page, can't remember what they used it
for off hand but they were mad at me when I added this....

-Eric
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