pthread_jit_write_with_callback_np() vs. pthread_jit_write_protect_np()

[marceltaeumel]

Apple suggests pthread_jit_write_with_callback_np() and a JIT callback allow list via the com.apple.security.cs.jit-write-allowlist entitlement as the way to port a JIT to Apple silicon.

• https://developer.apple.com/documentation/apple-silicon/porting-just-in-time-compilers-to-apple-silicon

We use pthread_jit_write_protect_np() at this point. How much longer is this going to work? Maybe we want to refactor this to the callback approach?

• https://keith.github.io/xcode-man-pages/pthread_jit_write_protect_np.3.html#DESCRIPTION

This is just a heads-up. 😺

[krono]

Note the entitlement way is confined to hardenen runtime app which is probably not our concern