Again, outstanding work by @laginimaineb - DMA straight from the WiFi chip into kernel mem., courtesy of PCIe! Who needs isolation, anyway?https://twitter.com/benhawkes/status/851843250977521664 …
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Replying to @esizkur
Thanks! It's disappointing that there's no attempt at isolation. Also, not having an SMMU breaks all the assurances of EL2, so there's that.
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Replying to @laginimaineb @esizkur
It seems like it might be the phone vendor's responsibility to set up the IOMMU in their device tree metadata. Qualcomm has sample docs.
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I don't have time to research whether kernel does IOMMU right so I pulled the PCIe wifi that came with my main box and replaced it w/ usb.
3:44 PM - 11 Apr 2017
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