[PATCH V32 11/27] x86: Lock down IO port access when the kernel is locked down

Thomas Gleixner tglx at linutronix.de
Thu Apr 4 07:49:02 UTC 2019

On Wed, 3 Apr 2019, Matthew Garrett wrote:

> From: Matthew Garrett <mjg59 at 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 at google.com>
> Signed-off-by: David Howells <dhowells at redhat.com>

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

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