Theo de Raadt and Linus Torvalds are debating mseal(), a #Linux variant of OpenBSD's mimmutable() syscall – which might or might not be merged for #kernel 6.10, as can be seen from other parts of the discussion:
https://lore.kernel.org/all/CAHk-=wgsGCKvN0Db6ZRZqJwXQrmhZyWB6RmABaOp4DiZbXgNew@mail.gmail.com/T/#u