[PATCH V31 11/25] x86: Lock down IO port access when the kernel is locked down
luto at kernel.org
Tue Mar 26 20:56:49 UTC 2019
On Tue, Mar 26, 2019 at 11:28 AM Matthew Garrett
<matthewgarrett at google.com> 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.
Reviewed-by: Andy Lutomirski <luto at kernel.org>
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