Messages in this thread | | | Date | Thu, 4 Apr 2019 09:49:02 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH V32 11/27] x86: Lock down IO port access when the kernel is locked down |
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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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