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274 lines
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<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-release-16.09">
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<title>Release 16.09 (<quote>Flounder</quote>, 2016/09/30)</title>
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<para>
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In addition to numerous new and upgraded packages, this release has
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the following highlights:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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Many NixOS configurations and Nix packages now use significantly
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less disk space, thanks to the
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<link xlink:href="https://github.com/NixOS/nixpkgs/issues/7117">extensive
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work on closure size reduction</link>. For example, the closure
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size of a minimal NixOS container went down from ~424 MiB in
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16.03 to ~212 MiB in 16.09, while the closure size of Firefox
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went from ~651 MiB to ~259 MiB.
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</para>
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</listitem>
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<listitem>
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<para>
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To improve security, packages are now
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<link xlink:href="https://github.com/NixOS/nixpkgs/pull/12895">built
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using various hardening features</link>. See the Nixpkgs manual
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for more information.
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</para>
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</listitem>
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<listitem>
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<para>
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Support for PXE netboot. See
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<xref linkend="sec-booting-from-pxe" /> for documentation.
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</para>
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</listitem>
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<listitem>
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<para>
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X.org server 1.18. If you use the <literal>ati_unfree</literal>
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driver, 1.17 is still used due to an ABI incompatibility.
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</para>
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</listitem>
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<listitem>
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<para>
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This release is based on Glibc 2.24, GCC 5.4.0 and systemd 231.
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The default Linux kernel remains 4.4.
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</para>
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</listitem>
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</itemizedlist>
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<para>
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The following new services were added since the last release:
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</para>
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<itemizedlist spacing="compact">
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<listitem>
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<para>
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<literal>(this will get automatically generated at release time)</literal>
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</para>
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</listitem>
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</itemizedlist>
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<para>
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When upgrading from a previous release, please be aware of the
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following incompatible changes:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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A large number of packages have been converted to use the
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multiple outputs feature of Nix to greatly reduce the amount of
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required disk space, as mentioned above. This may require
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changes to any custom packages to make them build again; see the
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relevant chapter in the Nixpkgs manual for more information.
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(Additional caveat to packagers: some packaging conventions
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related to multiple-output packages
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<link xlink:href="https://github.com/NixOS/nixpkgs/pull/14766">were
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changed</link> late (August 2016) in the release cycle and
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differ from the initial introduction of multiple outputs.)
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</para>
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</listitem>
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<listitem>
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<para>
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Previous versions of Nixpkgs had support for all versions of the
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LTS Haskell package set. That support has been dropped. The
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previously provided <literal>haskell.packages.lts-x_y</literal>
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package sets still exist in name to aviod breaking user code,
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but these package sets don't actually contain the versions
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mandated by the corresponding LTS release. Instead, our package
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set it loosely based on the latest available LTS release, i.e.
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LTS 7.x at the time of this writing. New releases of NixOS and
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Nixpkgs will drop those old names entirely.
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<link xlink:href="https://nixos.org/nix-dev/2016-June/020585.html">The
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motivation for this change</link> has been discussed at length
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on the <literal>nix-dev</literal> mailing list and in
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<link xlink:href="https://github.com/NixOS/nixpkgs/issues/14897">Github
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issue #14897</link>. Development strategies for Haskell hackers
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who want to rely on Nix and NixOS have been described in
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<link xlink:href="https://nixos.org/nix-dev/2016-June/020642.html">another
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nix-dev article</link>.
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</para>
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</listitem>
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<listitem>
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<para>
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Shell aliases for systemd sub-commands
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<link xlink:href="https://github.com/NixOS/nixpkgs/pull/15598">were
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dropped</link>: <literal>start</literal>,
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<literal>stop</literal>, <literal>restart</literal>,
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<literal>status</literal>.
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</para>
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</listitem>
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<listitem>
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<para>
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Redis now binds to 127.0.0.1 only instead of listening to all
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network interfaces. This is the default behavior of Redis 3.2
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>/var/empty</literal> is now immutable. Activation
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script runs <literal>chattr +i</literal> to forbid any
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modifications inside the folder. See
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<link xlink:href="https://github.com/NixOS/nixpkgs/pull/18365">
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the pull request</link> for what bugs this caused.
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</para>
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</listitem>
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<listitem>
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<para>
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Gitlab's maintainance script <literal>gitlab-runner</literal>
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was removed and split up into the more clearer
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<literal>gitlab-run</literal> and <literal>gitlab-rake</literal>
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scripts, because <literal>gitlab-runner</literal> is a component
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of Gitlab CI.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>services.xserver.libinput.accelProfile</literal>
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default changed from <literal>flat</literal> to
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<literal>adaptive</literal>, as per
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<link xlink:href="https://wayland.freedesktop.org/libinput/doc/latest/group__config.html#gad63796972347f318b180e322e35cee79">
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official documentation</link>.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>fonts.fontconfig.ultimate.rendering</literal> was
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removed because our presets were obsolete for some time. New
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presets are hardcoded into FreeType; you can select a preset via
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<literal>fonts.fontconfig.ultimate.preset</literal>. You can
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customize those presets via ordinary environment variables,
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using <literal>environment.variables</literal>.
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</para>
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</listitem>
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<listitem>
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<para>
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The <literal>audit</literal> service is no longer enabled by
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default. Use <literal>security.audit.enable = true</literal> to
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explicitly enable it.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>pkgs.linuxPackages.virtualbox</literal> now contains
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only the kernel modules instead of the VirtualBox user space
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binaries. If you want to reference the user space binaries, you
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have to use the new <literal>pkgs.virtualbox</literal> instead.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>goPackages</literal> was replaced with separated Go
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applications in appropriate <literal>nixpkgs</literal>
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categories. Each Go package uses its own dependency set. There's
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also a new <literal>go2nix</literal> tool introduced to generate
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a Go package definition from its Go source automatically.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>services.mongodb.extraConfig</literal> configuration
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format was changed to YAML.
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</para>
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</listitem>
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<listitem>
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<para>
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PHP has been upgraded to 7.0
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</para>
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</listitem>
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</itemizedlist>
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<para>
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Other notable improvements:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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Revamped grsecurity/PaX support. There is now only a single
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general-purpose distribution kernel and the configuration
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interface has been streamlined. Desktop users should be able to
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simply set
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</para>
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<programlisting language="bash">
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{
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security.grsecurity.enable = true;
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}
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</programlisting>
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<para>
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to get a reasonably secure system without having to sacrifice
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too much functionality.
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</para>
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</listitem>
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<listitem>
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<para>
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Special filesystems, like <literal>/proc</literal>,
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<literal>/run</literal> and others, now have the same mount
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options as recommended by systemd and are unified across
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different places in NixOS. Mount options are updated during
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<literal>nixos-rebuild switch</literal> if possible. One benefit
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from this is improved security — most such filesystems are now
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mounted with <literal>noexec</literal>, <literal>nodev</literal>
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and/or <literal>nosuid</literal> options.
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</para>
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</listitem>
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<listitem>
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<para>
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The reverse path filter was interfering with DHCPv4 server
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operation in the past. An exception for DHCPv4 and a new option
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to log packets that were dropped due to the reverse path filter
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was added
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(<literal>networking.firewall.logReversePathDrops</literal>) for
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easier debugging.
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</para>
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</listitem>
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<listitem>
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<para>
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Containers configuration within
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<literal>containers.<name>.config</literal> is
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<link xlink:href="https://github.com/NixOS/nixpkgs/pull/17365">now
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properly typed and checked</link>. In particular, partial
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configurations are merged correctly.
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</para>
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</listitem>
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<listitem>
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<para>
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The directory container setuid wrapper programs,
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<literal>/var/setuid-wrappers</literal>,
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<link xlink:href="https://github.com/NixOS/nixpkgs/pull/18124">is
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now updated atomically to prevent failures if the switch to a
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new configuration is interrupted.</link>
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>services.xserver.startGnuPGAgent</literal> has been
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removed due to GnuPG 2.1.x bump. See
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<link xlink:href="https://github.com/NixOS/nixpkgs/commit/5391882ebd781149e213e8817fba6ac3c503740c">
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how to achieve similar behavior</link>. You might need to
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<literal>pkill gpg-agent</literal> after the upgrade to prevent
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a stale agent being in the way.
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</para>
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</listitem>
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<listitem>
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<para>
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<link xlink:href="https://github.com/NixOS/nixpkgs/commit/e561edc322d275c3687fec431935095cfc717147">
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Declarative users could share the uid due to the bug in the
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script handling conflict resolution. </link>
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</para>
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</listitem>
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<listitem>
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<para>
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Gummi boot has been replaced using systemd-boot.
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</para>
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</listitem>
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<listitem>
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<para>
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Hydra package and NixOS module were added for convenience.
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</para>
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</listitem>
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</itemizedlist>
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</section>
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