From d14ba1e1add6cca568515f87508ad5d00180bf16 Mon Sep 17 00:00:00 2001 From: Daniel Frank Date: Fri, 18 Oct 2019 00:30:11 +0200 Subject: security.rngd: start rngd during early boot to reduce entropy starvation due to encrypted swap and remove PrivateTmp to avoid a circular dependency --- nixos/modules/security/rngd.nix | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/nixos/modules/security/rngd.nix b/nixos/modules/security/rngd.nix index d9d6d9c9f25..5566c53897d 100644 --- a/nixos/modules/security/rngd.nix +++ b/nixos/modules/security/rngd.nix @@ -39,12 +39,15 @@ in description = "Hardware RNG Entropy Gatherer Daemon"; + # rngd may have to start early to avoid entropy starvation during boot with encrypted swap + unitConfig.DefaultDependencies = false; serviceConfig = { ExecStart = "${pkgs.rng-tools}/sbin/rngd -f" + optionalString cfg.debug " -d"; + # PrivateTmp would introduce a circular dependency if /tmp is on tmpfs and swap is encrypted, + # thus depending on rngd before swap, while swap depends on rngd to avoid entropy starvation. NoNewPrivileges = true; PrivateNetwork = true; - PrivateTmp = true; ProtectSystem = "full"; ProtectHome = true; }; -- cgit 1.4.1