nixos/modules/security/rngd: Disable by default
`rngd` seems to be the root cause for slow boot issues, and its functionality is redundant since kernel v3.17 (2014), which introduced a `krngd` task (in kernel space) that takes care of pulling in data from hardware RNGs: > commit be4000bc4644d027c519b6361f5ae3bbfc52c347 > Author: Torsten Duwe <duwe@lst.de> > Date: Sat Jun 14 23:46:03 2014 -0400 > > hwrng: create filler thread > > This can be viewed as the in-kernel equivalent of hwrngd; > like FUSE it is a good thing to have a mechanism in user land, > but for some reasons (simplicity, secrecy, integrity, speed) > it may be better to have it in kernel space. > > This patch creates a thread once a hwrng registers, and uses > the previously established add_hwgenerator_randomness() to feed > its data to the input pool as long as needed. A derating factor > is used to bias the entropy estimation and to disable this > mechanism entirely when set to zero. Closes: #96067
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@ -10,11 +10,10 @@ in
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security.rngd = {
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enable = mkOption {
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type = types.bool;
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default = true;
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default = false;
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description = ''
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Whether to enable the rng daemon, which adds entropy from
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hardware sources of randomness to the kernel entropy pool when
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available.
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Whether to enable the rng daemon. Devices that the kernel recognises
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as entropy sources are handled automatically by krngd.
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'';
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};
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debug = mkOption {
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@ -26,12 +25,6 @@ in
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};
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config = mkIf cfg.enable {
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services.udev.extraRules = ''
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KERNEL=="random", TAG+="systemd"
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SUBSYSTEM=="cpu", ENV{MODALIAS}=="cpu:type:x86,*feature:*009E*", TAG+="systemd", ENV{SYSTEMD_WANTS}+="rngd.service"
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KERNEL=="hw_random", TAG+="systemd", ENV{SYSTEMD_WANTS}+="rngd.service"
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'';
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systemd.services.rngd = {
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bindsTo = [ "dev-random.device" ];
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