These patches are described in:
	ftp://freebsd.org/pub/CERT/advisories/FreeBSD-SA-97:03.sysinstall

They are meant for:
sysinstall-patch		FreeBSD 2.1.0
sysinstall-patch.2.1		FreeBSD 2.1.5, 2.1.6, 2.1.7, 2.2, 2.2.1