lkml.org 
[lkml]   [2019]   [Apr]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V32 11/27] x86: Lock down IO port access when the kernel is locked down
On Wed, 3 Apr 2019, Matthew Garrett wrote:

> From: Matthew Garrett <mjg59@srcf.ucam.org>
>
> IO port access would permit users to gain access to PCI configuration
> registers, which in turn (on a lot of hardware) give access to MMIO
> register space. This would potentially permit root to trigger arbitrary
> DMA, so lock it down by default.
>
> This also implicitly locks down the KDADDIO, KDDELIO, KDENABIO and
> KDDISABIO console ioctls.
>
> Signed-off-by: Matthew Garrett <mjg59@google.com>
> Signed-off-by: David Howells <dhowells@redhat.com>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

\
 
 \ /
  Last update: 2019-04-04 09:49    [W:0.224 / U:2.308 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site