linux-kernel - Re: [PATCH 3/3-v2] security: allow capable check to permit mmap or low vm space

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Message-ID: <Xine.LNX.4.64.0711271137300.26171@us.intercode.com.au>
Date:	Tue, 27 Nov 2007 11:38:24 +1100 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Eric Paris <eparis@...hat.com>
cc:	linux-kernel@...r.kernel.org, sds@...ho.nsa.gov,
	selinux@...ho.nsa.gov, alan@...hat.com, chrisw@...hat.com,
	hpa@...or.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 3/3-v2] security: allow capable check to permit mmap or
 low vm space

On Mon, 26 Nov 2007, Eric Paris wrote:

> On a kernel with CONFIG_SECURITY but without an LSM which implements
> security_file_mmap it is impossible for an application to mmap addresses
> lower than mmap_min_addr.  Based on a suggestion from a developer in the
> openwall community this patch adds a check for CAP_SYS_RAWIO.  It is
> assumed that any process with this capability can harm the system a lot
> more easily than writing some stuff on the zero page and then trying to
> get the kernel to trip over itself.  It also means that programs like X
> on i686 which use vm86 emulation can work even with mmap_min_addr set.
> 
> Signed-off-by: Eric Paris <eparis@...hat.com>

Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6.git#for-akpm

If nobody hollers, I'll push it to Linus when the next merge window opens.


- James
-- 
James Morris
<jmorris@...ei.org>
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