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

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Date:	Wed, 3 Jun 2009 13:31:56 -0400
From:	Eric Paris <eparis@...isplace.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>,
	"Larry H." <research@...reption.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Stephen Smalley <sds@...ho.nsa.gov>, linux-mm@...ck.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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 1:28 PM, Linus Torvalds
<torvalds@...ux-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
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