| Date | Mon, 15 Nov 2021 05:21:26 -0800 | From | Christoph Hellwig <> | Subject | Re: [PATCH 03/11] PCI: pci_stub: Suppress kernel DMA ownership auto-claiming |
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On Mon, Nov 15, 2021 at 10:05:44AM +0800, Lu Baolu wrote: > pci_stub allows the admin to block driver binding on a device and make > it permanently shared with userspace. Since pci_stub does not do DMA, > it is safe.
If an IOMMU is setup and dma-iommu or friends are not used nothing is unsafe anyway, it just is that IOMMU won't work..
> However the admin must understand that using pci_stub allows > userspace to attack whatever device it was bound to.
I don't understand this sentence at all.
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