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<h1>Index</h1>
<h2 id="securityallowsimultaneousmultithreading" security-allowSimultaneousMultithreading="security-allowSimultaneousMultithreading"><code>security.allowSimultaneousMultithreading</code></h2>
<p>Whether to allow SMT/hyperthreading. Disabling SMT means that only
physical CPU cores will be usable at runtime, potentially at
significant performance cost.</p>
<p>The primary motivation for disabling SMT is to mitigate the risk of
leaking data between threads running on the same CPU core (due to
e.g., shared caches). This attack vector is unproven.</p>
<p>Disabling SMT is a supplement to the L1 data cache flushing mitigation
(see <a href="#opt-security.virtualisation.flushL1DataCache"></a>)
versus malicious VM guests (SMT could "bring back" previously flushed
data).</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default" security-allowSimultaneousMultithreading-default="security-allowSimultaneousMultithreading-default">Default</h3>
<p><code class="highlight"><span class="no">true</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix</a></p>
<h2 id="securityallowusernamespaces" security-allowUserNamespaces="security-allowUserNamespaces"><code>security.allowUserNamespaces</code></h2>
<p>Whether to allow creation of user namespaces.</p>
<p>The motivation for disabling user namespaces is the potential
presence of code paths where the kernel's permission checking
logic fails to account for namespacing, instead permitting a
namespaced process to act outside the namespace with the same
privileges as it would have inside it. This is particularly
damaging in the common case of running as root within the namespace.</p>
<p>When user namespace creation is disallowed, attempting to create a
user namespace fails with "no space left on device" (ENOSPC).
root may re-enable user namespace creation at runtime.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_1" security-allowUserNamespaces-default="security-allowUserNamespaces-default">Default</h3>
<p><code class="highlight"><span class="no">true</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix</a></p>
<h2 id="securityforcepagetableisolation" security-forcePageTableIsolation="security-forcePageTableIsolation"><code>security.forcePageTableIsolation</code></h2>
<p>Whether to force-enable the Page Table Isolation (PTI) Linux kernel
feature even on CPU models that claim to be safe from Meltdown.</p>
<p>This hardening feature is most beneficial to systems that run untrusted
workloads that rely on address space isolation for security.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_2" security-forcePageTableIsolation-default="security-forcePageTableIsolation-default">Default</h3>
<p><code class="highlight"><span class="no">false</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix</a></p>
<h2 id="securitylockkernelmodules" security-lockKernelModules="security-lockKernelModules"><code>security.lockKernelModules</code></h2>
<p>Disable kernel module loading once the system is fully initialised.
Module loading is disabled until the next reboot. Problems caused
by delayed module loading can be fixed by adding the module(s) in
question to {option}<code>boot.kernelModules</code>.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_3" security-lockKernelModules-default="security-lockKernelModules-default">Default</h3>
<p><code class="highlight"><span class="no">false</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/lock-kernel-modules.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/lock-kernel-modules.nix</a></p>
<h2 id="securityprotectkernelimage" security-protectKernelImage="security-protectKernelImage"><code>security.protectKernelImage</code></h2>
<p>Whether to prevent replacing the running kernel image.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_4" security-protectKernelImage-default="security-protectKernelImage-default">Default</h3>
<p><code class="highlight"><span class="no">false</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix</a></p>
<h2 id="securityunprivilegedusernsclone" security-unprivilegedUsernsClone="security-unprivilegedUsernsClone"><code>security.unprivilegedUsernsClone</code></h2>
<p>When disabled, unprivileged users will not be able to create new namespaces.
By default unprivileged user namespaces are disabled.
This option only works in a hardened profile.</p>
<p><strong>Type:</strong> <code>boolean</code></p>
<h3 id="default_5" security-unprivilegedUsernsClone-default="security-unprivilegedUsernsClone-default">Default</h3>
<p><code class="highlight"><span class="no">false</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/misc.nix</a></p>
<h2 id="securitywrapperdirsize" security-wrapperDirSize="security-wrapperDirSize"><code>security.wrapperDirSize</code></h2>
<p>Size limit for the /run/wrappers tmpfs. Look at mount(8), tmpfs size option,
for the accepted syntax. WARNING: don't set to less than 64MB.</p>
<p><strong>Type:</strong> <code>string</code></p>
<h3 id="default_6" security-wrapperDirSize-default="security-wrapperDirSize-default">Default</h3>
<p><code class="highlight"><span class="s2">&quot;50%&quot;</span></code></p>
<h3 id="example" security-wrapperDirSize-example="security-wrapperDirSize-example">Example</h3>
<p><code class="highlight"><span class="s2">&quot;10G&quot;</span></code></p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/wrappers/default.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/wrappers/default.nix</a></p>
<h2 id="securitywrappers" security-wrappers="security-wrappers"><code>security.wrappers</code></h2>
<p>This option effectively allows adding setuid/setgid bits, capabilities,
changing file ownership and permissions of a program without directly
modifying it. This works by creating a wrapper program under the
{option}<code>security.wrapperDir</code> directory, which is then added to
the shell <code>PATH</code>.</p>
<p><strong>Type:</strong> <code>attribute set of (submodule)</code></p>
<h3 id="default_7" security-wrappers-default="security-wrappers-default">Default</h3>
<p><code class="highlight"><span class="p">{</span> <span class="p">}</span></code></p>
<h3 id="example_1" security-wrappers-example="security-wrappers-example">Example</h3>
<p>`#!nix {
# a setuid root program
doas =
{ setuid = true;
owner = "root";
group = "root";
source = "${pkgs.doas}/bin/doas";
};</p>
<p># a setgid program
locate =
{ setgid = true;
owner = "root";
group = "mlocate";
source = "${pkgs.locate}/bin/locate";
};</p>
<p># a program with the CAP_NET_RAW capability
ping =
{ owner = "root";
group = "root";
capabilities = "cap_net_raw+ep";
source = "${pkgs.iputils.out}/bin/ping";
};
}
`</p>
<p><strong>Declared by:</strong> <a href="https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/wrappers/default.nix">https://github.com/nixos/nixpkgs/blob/master/nixos/modules/security/wrappers/default.nix</a></p>
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