These patches are described in:
	ftp://ftp/freebsd.org/pub/CERT/advisories/FreeBSD-SA-98:04.mmap

They are meant for:
mmap-current		FreeBSD-current before 1998/05/19
mmap-22			FreeBSD-2.2.*
                	FreeBSD-2.2-stable before 1998/05/24