Was recently introduced to the concept of security rings. I was a bit alarmed when learning about ring -3. While there's debate about nomenclature, I'm curious about the existence of something similar on mobile devices. I read that ARM processors do not have a separate soc like most x86 do.
Ultimately I'm wondering if someone could shed some light on how much of a backdoor this creates, especially when it comes to mobile devices (our pixels) and if GrapheneOS does anything about it.
I spoke to a lead developer on the Microsoft Defender team that introduced me to it. He seemed pretty convinced that it was a collaboration between big government and companies to always have an accessible hardware backdoor available to them.