Author here. Thanks for posting!
I have done some progress since, just didn't have much time to churn out a Part 2 (soon™, maybe)
Feel free to ask any questions
Feel free to ask any questions
(re: weird bug where calling __aeabi_uidiv calls __exidx_end, could be hard fault handler getting invoked due to either div by 0 or incorrect linkage - that M0 has a few caveats around this instruction that I vaguely recall needing specific compiler settings for)
Great write-up BTW - subscribe!
I would say that the possibility is there - imagine a buffer overflow (or something as bad) in the driver running in the kernel.
However, getting the malicious firmware onto the MCU would be the difficult part. But I suppose even a purposefully "bad" batch of MCUs that have an extra core executing malicious code is not exactly science fiction in these times :P
> could be hard fault handler getting invoked due to either div by 0 or incorrect linkage
Interesting! I will look into this, cheers.
> Great write-up BTW - subscribe!
Thank you, much appreciated!