Memory Integrity Enforcement is the culmination of a truly incredible amount of work :)
While there's so much to love, one of my favorite pieces was getting to bring kalloc_type-style isolation to out-of-bounds accesses on both the architectural and speculative path. This lets us both mitigate a variety of Spectre v1 style attacks and break the reliable exploitation of some of the most powerful first-order memory corruption primitives (arb offset OOB R/W).
https://security.apple.com/blog/memory-integrity-enforcement/

Memory Integrity Enforcement: A complete vision for memory safety in Apple devices - Apple Security Research
Memory Integrity Enforcement (MIE) is the culmination of an unprecedented design and engineering effort spanning half a decade that combines the unique strengths of Apple silicon hardware with our advanced operating system security to provide industry-first, always-on memory safety protection across our devices — without compromising our best-in-class device performance. We believe Memory Integrity Enforcement represents the most significant upgrade to memory safety in the history of consumer operating systems.



