ntpd(8) is an example of a bloated daemon that runs with superuser privileges, making it problematic in a secure environment. Especially when you consider that accurate network time is a necessity for using the kerberos(8) authentication system. The clockctl(4) subsystem allows NTPD to run as a nonprivileged account, thus reducing the impact of an NTPD exploit.
OpenBSD uses a different approach—they rewrote a less bloated version of NTPD called OpenNTPD which uses privilege separation.
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