priv_check() question

[exorcistkiller]

Hi! I am taking a FreeBSD course this summer and I'm doing a homework. A new
system call uidkill() is to be added. uidkill(uid_t uid, int signum) sends
signal specified by signum to all processes owned by uid, excluding the
calling process itself. 

I'm almost done, however I get stuck with priv_check(). If the calling
process is trying to send signal to processes owned by others, permission
should be denied. My implementation simply uses an if (p->p_ucred->cr_uid ==
ksi.ksi_uid) to deny it, however priv_check() is required. My question is:
what privilege a process should have to send signal to processes owned by
others? PRIV_SIGNAL_DIFFCRED?

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