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

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  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

#1623835 — Re: [PATCH 13/24] x86: Lock down IO port access when the kernel is locked down

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>

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