nixpkgs/nixos/modules/security/hidepid.nix

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{ config, lib, ... }:
with lib;
{
meta = {
maintainers = [ maintainers.joachifm ];
doc = ./hidepid.xml;
};
options = {
security.hideProcessInformation = mkOption {
type = types.bool;
default = false;
description = ''
Restrict process information to the owning user.
'';
};
};
config = mkIf config.security.hideProcessInformation {
users.groups.proc.gid = config.ids.gids.proc;
users.groups.proc.members = [ "polkituser" ];
boot.specialFileSystems."/proc".options = [ "hidepid=2" "gid=${toString config.ids.gids.proc}" ];
systemd.services.systemd-logind.serviceConfig.SupplementaryGroups = [ "proc" ];
# Disable cgroupsv2, which doesn't work with hidepid.
# https://github.com/NixOS/nixpkgs/pull/104094#issuecomment-729996203
systemd.enableUnifiedCgroupHierarchy = false;
};
}