I’m somewhat curious why GOT and PLT are ever mapped readable these days, when it could have been only mapped readable and then glibc use one of the various API

I’m somewhat curious why GOT and PLT are ever mapped readable these days, when it could have been only mapped readable and then glibc use one of the various API tricks that other JIT (ld.so is obviously a JIT too) often use to write to memory indirectly while maintaining security hardening, such as maintaining a dual mapping for writing at a random address offset from the readonly fixed address section. That way there is never a partial relo vs PIE vs performance vulnerability tradeoff