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

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Message-ID: <alpine.LFD.2.01.0906030912340.4880@localhost.localdomain>
Date:	Wed, 3 Jun 2009 09:18:22 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
cc:	Stephen Smalley <sds@...ho.nsa.gov>,
	"Larry H." <research@...reption.com>, linux-mm@...ck.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Rik van Riel <riel@...hat.com>, 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, Christoph Lameter wrote:
> 
> mmap_min_addr depends on CONFIG_SECURITY which establishes various
> strangely complex "security models".
> 
> The system needs to be secure by default.

It _is_ secure by default. You have to do some pretty non-default things 
to get away from it.

But I do agree that it might be good to move the thing into the generic 
path. I just don't think your arguments are very good. It's not about 
defaults, it's about the fact that this isn't worth being hidden by that 
security layer.

			Linus
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