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IOMMUs are a cute mitigation that changes the attack approach from "just read/write all physical memory" to "just change a pointer in some driver DMA data structure to let you read/write all physical memory". Yes, it's slightly harder. Only slightly.
I'm going to go ahead and say that GPU drivers will never get this right. Those things are such massive hairballs that if you enable eGPU support over an external interface, you have to assume you're immediately pwnable.
So whitelist Thunderbolt devices to... well, zero devices, to start with. Then start auditing and rewriting drivers and *only* whitelist for TB access those where all of the aforementioned concerns have been considered, possibly in a complete rewrite. It won't be easy.
You'll still have bugs, but, like, the current state of things is that nobody has even *considered* any of this. Right now it's not bugs, evil-device security is literally outside the scope of basically every PCIe driver right now.
They'll get it right only when the OS driver model or programming language data model forces them to.
GPU over Tbolt is one of the silliest applications. Right ones are storage, connectivity, display
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