Messages in this thread | | | Subject | Re: [PATCH 0/7] Do not read from descriptor ring | From | Jason Wang <> | Date | Thu, 10 Jun 2021 11:12:56 +0800 |
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在 2021/6/9 上午12:24, Andy Lutomirski 写道: > On 6/3/21 10:53 PM, Jason Wang wrote: >> Hi: >> >> The virtio driver should not trust the device. This beame more urgent >> for the case of encrtpyed VM or VDUSE[1]. In both cases, technology >> like swiotlb/IOMMU is used to prevent the poking/mangling of memory >> from the device. But this is not sufficient since current virtio >> driver may trust what is stored in the descriptor table (coherent >> mapping) for performing the DMA operations like unmap and bounce so >> the device may choose to utilize the behaviour of swiotlb to perform >> attacks[2]. > Based on a quick skim, this looks entirely reasonable to me. > > (I'm not a virtio maintainer or expert. I got my hands very dirty with > virtio once dealing with the DMA mess, but that's about it.) > > --Andy
Good to know that :)
Thanks
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