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Date: Wed, 3 Jun 2009 12:24:03 -0400
Message-ID: <7e0fb38c0906030924q73ffb387h2d20df7f8c2e75ba@mail.gmail.com>
Subject: Re: Security fix for remapping of page 0 (was [PATCH] Change 
	ZERO_SIZE_PTR to point at unmapped space)
From: Eric Paris <eparis@parisplace.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Christoph Lameter <cl@linux-foundation.org>,
       "Larry H." <research@subreption.com>, linux-mm@kvack.org,
       Rik van Riel <riel@redhat.com>, linux-kernel@vger.kernel.org,
       pageexec@freemail.hu
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On Wed, Jun 3, 2009 at 12:19 PM, Linus Torvalds
<torvalds@linux-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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