17 ms·
Seems likely a compromise at the GPU or ARM side as equally possible routes.
by jsjohnst 3y ago
Seems likely a compromise at the GPU or ARM side as equally possible routes.
- stephen_g 3y agoWhat do you mean? Both the GPU and CPU design are proprietary to Apple. They used to use regular ARM designed cores but the last one of those before switching to their own core design was something like the A5 days (from memory). It uses the ARM instruction set but isn’t actually designed by ARM at all. Similar for the GPU too. They may have started with HDL licensed from others (like I think their GPU might actually have been directly based on the PowerVR ones they used to use, but I believe the ARM one is basically from-scratch) but this vulnerability seems unlikely to have existed since then…
- jsjohnst 3y agoCoreSight is not Apple proprietary, it’s part of ARM’s offering. This vulnerability appears to be part of CoreSight. > but I believe the ARM one is basically from-scratch You are wrongly believing then. There’s still a bunch of ARM IP in their CPU.