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version 1.19, 2018/10/01 20:16:14 version 1.20, 2018/10/01 20:27:57
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 <li>Security improvements:  <li>Security improvements:
     <ul>      <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:      <li>New "retguard" security mechanism on amd64 and arm64:
         use per-function random cookies to protect access to function          use per-function random cookies to protect access to function
         return instructions, making them harder to use in ROP gadgets.          return instructions, making them harder to use in ROP gadgets.
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