Thunderclap TL;DR: someone finally tried on PCs (over Thunderbolt) what we did on the PS4 (over PCIe) years ago. As I said at the time, IOMMUs are useless if the drivers are not written assuming the device is evil. *Nobody* writes PCIe drivers assuming the device is evil.
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Replying to @marcan42
“Nobody writes drivers assuming the device is evil” more like. Except for those three people in the corner who do actually assume everything is evil.
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Replying to @winocm
Very true, but it's *much* worse with PCIe devices because people openly throw things in and out of DMA buffers. Like it's possible to accidentally write a simple USB driver that is secure; with PCIe it's pretty much impossible.
11:25 PM - 26 Feb 2019
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