Messages in this thread | | | Date | Wed, 7 Oct 2020 15:47:05 -0300 | From | Jason Gunthorpe <> | Subject | Re: [PATCH 13/13] vfio/type1: Mark follow_pfn as unsafe |
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On Wed, Oct 07, 2020 at 08:14:06PM +0200, Daniel Vetter wrote:
> Hm, but wouldn't need that the semi-nasty vma_open trick to make sure > that vma doesn't untimely disappear? Or is the idea to look up the > underlying vfio object, and refcount that directly?
Ah, the patches Alex was working on had the refcount I think, it does need co-ordination across multiple VFIO instances IIRC.
At least a simple check would guarentee we only have exposed PCI BAR pages which is not as bad security wise as the other stuff.
Jason
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