Re: [PATCH 0/7] Do not read from descriptor ring

[Jason Wang]

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