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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 <mjg59@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@google.com>
    > Signed-off-by: David Howells <dhowells@redhat.com>

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

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