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-<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-profile-hardened">
-  <title>Hardened</title>
-  <para>
-    A profile with most (vanilla) hardening options enabled by default,
-    potentially at the cost of stability, features and performance.
-  </para>
-  <para>
-    This includes a hardened kernel, and limiting the system information
-    available to processes through the <literal>/sys</literal> and
-    <literal>/proc</literal> 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
-    <link xlink:href="https://github.com/nixos/nixpkgs/tree/master/nixos/modules/profiles/hardened.nix">profile
-    source</link> for further detail on which settings are altered.
-  </para>
-  <warning>
-    <para>
-      This profile enables options that are known to affect system
-      stability. If you experience any stability issues when using the
-      profile, try disabling it. If you report an issue and use this
-      profile, always mention that you do.
-    </para>
-  </warning>
-</section>