* RemoveKeyRing= to remove all keyring entries of the specified user
+* ProtectReboot= that masks reboot() and kexec_load() syscalls, prohibits kill
+ on PID 1 with the relevant signals, and makes relevant files in /sys and
+ /proc (such as the sysrq stuff) unavailable
+
+* DeviceAllow= should also generate seccomp filters for mknod()
+
* Add DataDirectory=, CacheDirectory= and LogDirectory= to match
RuntimeDirectory=, and create it as necessary when starting a service, owned by the right user.