Re: [PATCH V3 03/11] x86: Lock down IO port access when module securityis enabled

[H. Peter Anvin]

On 09/03/2013 04:50 PM, Matthew Garrett wrote:
> 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.
> 
> Signed-off-by: Matthew Garrett <matthew.garrett@xxxxxxxxxx>

Seriously... just deny CAP_SYS_RAWIO to any system in secure mode.

	-hpa


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