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  <li>Security improvements:
      <ul>
+     <li>New <a href="https://man.openbsd.org/unveil.2">unveil(2)</a>
+         system call to restrict file system access of the calling
+         process to the specified files and directories.  It is most
+         powerful when properly combined with privilege separation
+         and <a href="https://man.openbsd.org/pledge.2">pledge(2)</a>.
      <li>New "retguard" security mechanism on amd64 and arm64:
          use per-function random cookies to protect access to function
          return instructions, making them harder to use in ROP gadgets.