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

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Date:	Wed, 3 Jun 2009 09:47:23 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
cc:	"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, 3 Jun 2009, Rik van Riel wrote:
> 
> Would anybody paranoid run their system without SELinux?

You make two very fundamental mistakes.

The first is to assume that this is about "paranoid" people. Security is 
_not_ about people who care deeply about security. It's about everybody. 
Look at viruses and DDoS attacks - the "paranoid" people absolutely depend 
on the _non_paranoid people being secure too!

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. I turn it off, and I know lots of other sane people do too. 
So the !SElinux case really does need to work.

				Linus
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