On Wed, 3 Apr 2019, Matthew Garrett wrote: > From: Matthew Garrett <mjg59@xxxxxxxxxxxxx> > > 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@xxxxxxxxxx> > Signed-off-by: David Howells <dhowells@xxxxxxxxxx> Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
