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Date:   Tue, 26 Mar 2019 13:55:39 -0700
From:   Andy Lutomirski <>
To:     Matthew Garrett <>
Cc:     James Morris <>,
        LSM List <>,
        LKML <>,
        David Howells <>,
        Linux API <>,
        Andrew Lutomirski <>,
        Matthew Garrett <>,
        Matthew Garrett <>,
        Bjorn Helgaas <>,
Subject: Re: [PATCH V31 10/25] PCI: Lock down BAR access when the kernel is
 locked down

On Tue, Mar 26, 2019 at 11:28 AM Matthew Garrett
<> wrote:
> From: Matthew Garrett <>
> 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?


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