BROP mitigation on systems without xonly (execute-only) hw-enforcement (OpenBSD)

Additional context, and status about recent developments in OpenBSD.<p>BROP: <a href="https:&#x2F;&#x2F;www.scs.stanford.edu&#x2F;brop&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.scs.stanford.edu&#x2F;brop&#x2F;</a> (paper &quot;Hacking Blind&quot; (2014): <a href="https:&#x2F;&#x2F;www.scs.stanford.edu&#x2F;brop&#x2F;bittau-brop.pdf" rel="nofollow">https:&#x2F;&#x2F;www.scs.stanford.edu&#x2F;brop&#x2F;bittau-brop.pdf</a><p>xonly mitigation status: <a href="https:&#x2F;&#x2F;marc.info&#x2F;?l=openbsd-tech&amp;m=167501519712725&amp;w=2" rel="nofollow">https:&#x2F;&#x2F;marc.info&#x2F;?l=openbsd-tech&amp;m=167501519712725&amp;w=2</a>