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

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Message-ID: <7e0fb38c0906031016m77416390v37fb0673e6e50501@mail.gmail.com>
Date:	Wed, 3 Jun 2009 13:16:14 -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 12:47 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:

> The other mistake is to think that SELinux is sane, or should be the
> default. It's a f*cking complex disaster, and makes performance plummet on
> some things.

While I think you couldn't be more wrong I'm not going to argue that topic....

I am at least interested in hearing about the 'performance plummet.'
I don't see any performance reports on my todo list but I am
interested in banging on any that people report.  Last performance
thing I heard anything about was Ingo doing some profiling of of a
network stack benchmark in which SELinux was eating a percent or two
his time.  I cut the SELinux performance penalty by about 50% on my
systems in that benchmark.  If others have complaints let me or the
selinux list know....

-Eric
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