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  	to reduce polymorphic RET instructions:
  	Todd Mortimer, November 20, 2017.
      </li>
+     <li>
+ 	</b>MAP_STACK</b> addition to 
+ 	<a href="https://man.openbsd.org/mmap.2">mmap(2)</a>
+ 	allows opportunistic verification that the stack-register
+ 	points at stack memory, therefore catching pivots to non-stack
+ 	memory (sometimes used in ROP attacks).
+ 	Theo de Raadt, April 12, 2018.
+     </li>
  </ul>
  
  <h3>Functions</h3>