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Oh, for sure what I said wouldn't work on a W^X system. I was just pointing out that one of the most widely used JIT software uses WX pages.

What OSes prohibit that? Linux doesn't (well, I think it can with SeLinux maybe?). OpenBSD might?

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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.

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