Comment by mananaysiempre

You’re right, and I shouldn’t have dismissed the PTR_MANGLE business so easily when I looked at the source[1]. In hindsight, the __ILP32__ (i.e. x32) special case for the high part of %rbp on x86-64 looks awfully suspicious even if you don’t know the details.

Given that __attribute__((optimize("no-omit-frame-pointer"))) doesn’t seem to get GCC to save the parent frame pointer on the stack reliably, while Clang doesn’t understand that atribute (or #pragma GCC optimize(...)) at all, this now looks less slick than it initially seemed.

... Have I mentioned that I dislike hardening techniques?

[1] https://elixir.bootlin.com/glibc/glibc-2.37/source/sysdeps/x...