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grsecurity module: force a known good kernel package set

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Previously, we would only set a default value, on the theory that
`boot.kernelPackages` could be used to sanely configure a custom grsec
kernel.  Regrettably, this is not the case and users who expect e.g.,
`boot.kernelPackages = pkgs.linuxPackages_latest` to work will end up
with a non-grsec kernel (this problem has come up twice on the bug
tracker recently).

With this patch, `security.grsecurity.enable = true` implies
`boot.kernelPackages = linuxPackages_grsec_nixos` and any customization
must be done via package override or by eschewing the module.
This commit is contained in:
Joachim Fasting 2016-11-28 12:04:51 +01:00
parent 5da1394a58
commit e99228db30
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GPG key ID: 7544761007FE4E08
2 changed files with 33 additions and 13 deletions
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2
nixos/modules/security/grsecurity.nix
View file

@ -57,7 +57,7 @@ in
config = mkIf cfg.enable {
boot.kernelPackages = mkDefault pkgs.linuxPackages_grsec_nixos;
boot.kernelPackages = mkForce pkgs.linuxPackages_grsec_nixos;
boot.kernelParams = optional cfg.disableEfiRuntimeServices "noefi";

44
nixos/modules/security/grsecurity.xml
View file

@ -51,6 +51,13 @@
# nixos-rebuild boot
# reboot
</programlisting>
<note><para>
Enabling the grsecurity module overrides
<option>boot.kernelPackages</option>, to reduce the risk of
misconfiguration. <xref linkend="sec-grsec-custom-kernel" />
describes how to use a custom kernel package set.
</para></note>
For most users, further configuration should be unnecessary. All users
are encouraged to look over <xref linkend="sec-grsec-security" /> before
using the system, however. If you experience problems, please refer to
@ -205,21 +212,22 @@
</para>
<para>
To use a custom kernel with upstream's recommended settings for server
deployments:
To build a custom kernel using upstream's recommended settings for server
deployments, while still using the NixOS module:
<programlisting>
boot.kernelPackages =
let
kernel = pkgs.linux_grsec_nixos.override {
extraConfig = ''
GRKERNSEC_CONFIG_AUTO y
GRKERNSEC_CONFIG_SERVER y
GRKERNSEC_CONFIG_SECURITY y
'';
nixpkgs.config.packageOverrides = super: {
linux_grsec_nixos = super.linux_grsec_nixos.override {
extraConfig = ''
GRKERNSEC_CONFIG_AUTO y
GRKERNSEC_CONFIG_SERVER y
GRKERNSEC_CONFIG_SECURITY y
'';
};
self = pkgs.linuxPackagesFor kernel self;
in self;
}
</programlisting>
</para>
<para>
The wikibook provides an exhaustive listing of
<link xlink:href="https://en.wikibooks.org/wiki/Grsecurity/Appendix/Grsecurity_and_PaX_Configuration_Options">kernel configuration options</link>.
</para>
@ -228,6 +236,18 @@
The NixOS module makes several assumptions about the kernel and so
may be incompatible with your customised kernel. Currently, the only way
to work around incompatibilities is to eschew the NixOS module.
If not using the NixOS module, a custom grsecurity package set can
be specified inline instead, as in
<programlisting>
boot.kernelPackages =
let
kernel = pkgs.linux_grsec_nixos.override {
extraConfig = /* as above */;
};
self = pkgs.linuxPackagesFor kernel self;
in self;
</programlisting>
</para>
</sect1>