It also made Apple silicon rather distinct from all other 64-bit ARM hardware in terms of both CPU core and peripherals. Our Corellium virtualization platform has been providing security researchers with unparalleled insight into how operating systems and programs work on Apple ARM processors. But in the process of developing our virtualization system, we also gain knowledge about the hardware we are modeling, and this knowledge can be best refined by testing it against real hardware – which we have only been able to do with the emergence of checkm8, an exploit that let us load programs onto Apple smartphones. This led directly to the Sandcastle project, where we built a kernel port to the A10 processor in early 2020.
So when Apple decided to allow installing custom kernels on the Macs with M1 processor, we were very happy to try building another Linux port to further our understanding of the hardware platform. As we were creating a model of the processor for our security research product, we were working on the Linux port in parallel.
Excellent work by Corellium, and this materialised a lot faster than I anticipated. This makes M1-equipped Macs potentially more useful than if they could only run macOS, but of course, as with all these closed platforms and Linux support, the devil is in the details – bringing up a Linux kernel is only the first step – a big and crucial one, but only the first.