<section xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xmlns:xi="http://www.w3.org/2001/XInclude"
         version="5.0"
         xml:id="sec-profile-hardened">
 <title>Hardened</title>

 <para>
  A profile with most (vanilla) hardening options enabled by default,
  potentially at the cost of features and performance.
 </para>

 <para>
  This includes a hardened kernel, and limiting the system information
  available to processes through the <filename>/sys</filename> and
  <filename>/proc</filename> filesystems. It also disables the User Namespaces
  feature of the kernel, which stops Nix from being able to build anything
  (this particular setting can be overriden via
  <xref linkend="opt-security.allowUserNamespaces"/>). See the
  <literal
   xlink:href="https://github.com/nixos/nixpkgs/tree/master/nixos/modules/profiles/hardened.nix">
  profile source</literal> for further detail on which settings are altered.
 </para>
</section>
