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

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Date:   Tue, 26 Mar 2019 15:19:03 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Matthew Garrett <matthewgarrett@...gle.com>,
        James Morris <jmorris@...ei.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        Linux API <linux-api@...r.kernel.org>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Matthew Garrett <mjg59@...gle.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH V31 10/25] PCI: Lock down BAR access when the kernel is
 locked down

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

> On Tue, Mar 26, 2019 at 11:28 AM Matthew Garrett
> <matthewgarrett@...gle.com> wrote:
> >
> > From: Matthew Garrett <mjg59@...f.ucam.org>
> >
> > 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