Re: [PATCH 13/24] x86: Lock down IO port access when the kernel is locked down

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH 13/24] x86: Lock down IO port access when the kernel is locked down
Date	2017-04-14 20:30 +0200
Message-ID	<twe8O-4tn-23@gated-at.bofh.it> (permalink)
References	<tsZzj-7hF-5@gated-at.bofh.it> <tsZzj-7hF-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Wed, 5 Apr 2017, David Howells wrote:
> From: Matthew Garrett <matthew.garrett@nebula.com>
> 
> 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 <matthew.garrett@nebula.com>
> Signed-off-by: David Howells <dhowells@redhat.com>

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

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

Re: [PATCH 13/24] x86: Lock down IO port access when the kernel is  locked down Thomas Gleixner <tglx@linutronix.de> - 2017-04-14 20:30 +0200

csiph-web