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Re:The dissection of a simple “hello world” ELF file by Hydraulix989 on Saturday November 28, 2015 @09:18PM (#10643459)
OpenBSD kernel enforces it (even inside the kernel, not just user mode processes):

http://marc.info/?l=openbsd-tech&m=142120787308107&w=2

Re:The dissection of a simple “hello world” ELF file by bgilroy26 on Saturday November 28, 2015 @10:11PM (#10643570)
Mike Larkin re:W^X a few days ago:

https://youtu.be/A7vtAAeW6zo