Re: Security fix for remapping of page 0 (was [PATCH] Change ZERO_SIZE_PTR to point at unmapped space)

Eric Paris
2009-06-03T16:24:05Z

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