Without a pre-formed opinion: does anybody have an intuition for the security benefits this provides? My first thought is that it’s primarily mitigating cases of attacker-introduced shellcode, which should already be pretty well covered by techniques like W^X. Code reuse techniques (ROP, JOP, etc.) aren’t impacted, right?
I would also think this would cause problems for JITed code, although maybe syscalls in JITed code aren’t common enough for this to be an issue (or the JIT gets around it by calling a syscall thunk, similar to how Go handled OpenBSD’s earlier syscall changes).
I would also think this would cause problems for JITed code, although maybe syscalls in JITed code aren’t common enough for this to be an issue (or the JIT gets around it by calling a syscall thunk, similar to how Go handled OpenBSD’s earlier syscall changes).