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

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Message-ID: <4A26CAD8.5070901@redhat.com>
Date:	Wed, 03 Jun 2009 15:11:20 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Larry H." <research@...reption.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-mm@...ck.org,
	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)

Christoph Lameter wrote:
> We could just move the check for mmap_min_addr out from
> CONFIG_SECURITY?
> 
> 
> Use mmap_min_addr indepedently of security models
> 
> This patch removes the dependency of mmap_min_addr on CONFIG_SECURITY.
> It also sets a default mmap_min_addr of 4096.
> 
> mmapping of addresses below 4096 will only be possible for processes
> with CAP_SYS_RAWIO.
> 
> 
> Signed-off-by: Christoph Lameter <cl@...ux-foundation.org>

Acked-by: Rik van Riel <riel@...hat.com>

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