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

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Message-ID: <alpine.DEB.1.10.0906031635070.9368@gentwo.org>
Date:	Wed, 3 Jun 2009 16:36:19 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Eric Paris <eparis@...isplace.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Larry H." <research@...reption.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-mm@...ck.org,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	pageexec@...email.hu, jmorris@...ei.org
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, Eric Paris wrote:

> > Thats easy to do but isnt it a bit weird now to configure mmap_min_addr?
>
> ??

The use of mmap_min_addr depends on the security configuration chose. The
security model may not check at all. But we can still configure the thing.

> > What about round_hint_to_min()?
>
> not sure what you mean....

We removed the CONFIG_SECURITY around code in there in the patch.

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