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

James Morris
2007-11-27T00:39:21Z

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>