Messages in this thread | | | Date | Mon, 20 Jun 2022 12:39:56 -0300 | From | Jason Gunthorpe <> | Subject | Re: [RFT][PATCH v1 5/6] vfio/ccw: Add kmap_local_page() for memcpy |
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On Sun, Jun 19, 2022 at 11:32:07PM -0700, Christoph Hellwig wrote:
> > This helps because we now block io memory from ever getting into these > > call paths. I'm pretty sure this is a serious security bug, but would > > let the IBM folks remark as I don't know it all that well.. > > Prevent as in crash when trying to convert it to a page?
That or when calling memcpy() on an IO memory PFN that the guest passed into the dma s/g list the ccw driver is processing.
Jason
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