This is a pretty approachable intro to manipulating the heap and subsequently exploiting it. On their iOS device they were using a jailbreak, presumably to circ

This is a pretty approachable intro to manipulating the heap and subsequently exploiting it. On their iOS device they were using a jailbreak, presumably to circumvent code signing requirements, but I assume you could do the same thing on any modern Mac - an M1/2 system for consistency, but I would expect similar behavior for the allocator on an Intel Mac.