[mhh__]

As in, the FPGA would have to be carefully segmented so the accelerator couldn't be used to access memory it shouldn't have access to.

I don't think it would happen in a general purpose chip but I could see it happening in a smaller one like the exploits christopher Domas demonstrated against some embedded X86 cores.

[rowanG077]

Why though? Your Integrated Intel or AMD GPU can also access all of your memory. I don't see how an FPGA provides any additional attack vector. As I said you'd need code execution privileges anyway and once you have that your system is already owned.