These patches are described in:
	ftp://ftp/freebsd.org/pub/CERT/advisories/FreeBSD-SA-98:07.rst

They are meant for:
rst-current		FreeBSD-current before 1998/09/11
rst-22			FreeBSD-2.2.6, FreeBSD 2.2.7 and
                	FreeBSD-2.2-stable before 1998/09/16