W^X toggle button in RWX allocation

To: tech-security%netbsd.org@localhost
Subject: W^X toggle button in RWX allocation
From: Kamil Rytarowski <n54%gmx.com@localhost>
Date: Sun, 4 Jun 2017 14:41:16 +0200

There is a new code for RWX memory mapping with MAP_REMAPDUP.

Is there a functionality to switch which mapping is in force? To
manually switch between RW or RX? This would be useful for the W^X
mechanism in firefox.

https://jandemooij.nl/blog/2015/12/29/wx-jit-code-enabled-in-firefox/

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