From: James Morris <jmorris@namei.org>
To: Eric Paris <eparis@redhat.com>
Cc: linux-kernel@vger.kernel.org, sds@tycho.nsa.gov,
selinux@tycho.nsa.gov, alan@redhat.com, chrisw@redhat.com,
hpa@zytor.com, akpm@linux-foundation.org
Subject: Re: [PATCH 3/3-v2] security: allow capable check to permit mmap or low vm space
Date: Tue, 27 Nov 2007 11:38:24 +1100 (EST) [thread overview]
Message-ID: <Xine.LNX.4.64.0711271137300.26171@us.intercode.com.au> (raw)
In-Reply-To: <1196120866.16779.16.camel@localhost.localdomain>
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@redhat.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@namei.org>
prev parent reply other threads:[~2007-11-27 0:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-26 23:47 [PATCH 3/3-v2] security: allow capable check to permit mmap or low vm space Eric Paris
2007-11-27 0:38 ` James Morris [this message]
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