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

Eric Paris
2009-06-03T17:31:58Z

On Wed, Jun 3, 2009 at 1:28 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
>
> On Wed, 3 Jun 2009, Eric Paris wrote:
>>
>> I am at least interested in hearing about the 'performance plummet.'
>
> It's perhaps not so much SElinux itself, but the AUDIT support (which it
> requires) that is really _very_ noticeable on microbenchmarks.
>
> Last time I ran lmbench on a Fedora kernel it was horrible. Turning off
> AUDIT (which also turns off SElinux) fixes it.
>
> It may be crazy distro auditing rules or whatever, but that doesn't change
> the basic issue.

Probably AUDITSYSCALL, not AUDIT. SELinux only needs AUDIT. I'll
poke that too someday, thanks.

-Eric