Does that even work in W^X platforms? Context for my response has that assumption, we can't simply throw it out the window, right?
I think I read somewhere about making two mappings to the same physical page (one W, one X), are you referring to that?
(I'd still need to know how that works as it kinda defeats the protection, the OS should prohibit that, right?)
The question was about OSes with hardened runtime protections. The most basic of them all is W^X. All BSDs use it, and IIRC Linux is able to enforce it as well. I'd be surprised if it isn't the default in most distros, but I guess it's not impossible. I need to go for lunch so I won't check right now.