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nixos kernel.nix: add an option to customize the kernel RANDSTRUCT seed

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This commit is contained in:
Pierre Bourdon 2019-01-12 01:35:18 +01:00
parent a258015d3a
commit 8769d2d58c
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GPG key ID: 6FB80DCD84DA0F1C
1 changed files with 16 additions and 2 deletions
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18
nixos/modules/system/boot/kernel.nix
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@ -5,7 +5,7 @@ with lib;
let
inherit (config.boot) kernelPatches;
inherit (config.boot.kernel) features;
inherit (config.boot.kernel) features randstructSeed;
inherit (config.boot.kernelPackages) kernel;
kernelModulesConf = pkgs.writeText "nixos.conf"
@ -38,6 +38,7 @@ in
default = pkgs.linuxPackages;
apply = kernelPackages: kernelPackages.extend (self: super: {
kernel = super.kernel.override {
inherit randstructSeed;
kernelPatches = super.kernel.kernelPatches ++ kernelPatches;
features = lib.recursiveUpdate super.kernel.features features;
};
@ -67,6 +68,19 @@ in
description = "A list of additional patches to apply to the kernel.";
};
boot.kernel.randstructSeed = mkOption {
type = types.str;
default = "";
example = "my secret seed";
description = ''
Provides a custom seed for the <varname>RANDSTRUCT</varname> security
option of the Linux kernel. Note that <varname>RANDSTRUCT</varname> is
only enabled in NixOS hardened kernels. Using a custom seed requires
building the kernel and dependent packages locally, since this
customization happens at build time.
'';
};
boot.kernelParams = mkOption {
type = types.listOf types.str;
default = [ ];
@ -298,7 +312,7 @@ in
# !!! Should this really be needed?
(isYes "MODULES")
(isYes "BINFMT_ELF")
];
] ++ (optional (randstructSeed != "") (isYes "GCC_PLUGIN_RANDSTRUCT"));
# nixpkgs kernels are assumed to have all required features
assertions = if config.boot.kernelPackages.kernel ? features then [] else