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