Re: [PATCH V31 10/25] PCI: Lock down BAR access when the kernel is locked down

[Alex Williamson]

On Tue, 26 Mar 2019 13:55:39 -0700
Andy Lutomirski <luto@xxxxxxxxxx> wrote:

> On Tue, Mar 26, 2019 at 11:28 AM Matthew Garrett
> <matthewgarrett@xxxxxxxxxx> wrote:
> >
> > From: Matthew Garrett <mjg59@xxxxxxxxxxxxx>
> >
> > Any hardware that can potentially generate DMA has to be locked down in
> > order to avoid it being possible for an attacker to modify kernel code,
> > allowing them to circumvent disabled module loading or module signing.
> > Default to paranoid - in future we can potentially relax this for
> > sufficiently IOMMU-isolated devices.  
> 
> Does this break vfio?

No, vfio provides its own interface to pci config space.  Thanks,

Alex