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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 <>
> 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 <>
> Signed-off-by: David Howells <>

Reviewed-by: Thomas Gleixner <>

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