Very interesting read!<p>During my training, I worked on a BIND4-&gt;BIND9 transition in a mainframe team and given the honourable task of looking for ways to make the configuration more secure.<p>I did quite a bit of reading back then, and I think I kind of remember reading something about z&#x2F;Architecture having all the pieces in place to provide W^X-style memory protection, but the OS not using it (at least not z&#x2F;OS). This article seems to say the opposite. Now I am confused if I mis-remember this detail or if the article I read back then was wrong. :-?