FreeBSD-module-SA-10-07.mbuf is a project mainly written in C, it's free.
FreeBSD Security Advisory SA-10:07.mbuf workaround
This module blocks sendfile(2) to block the mbuf bug described in SA-10:07.mbuf
env PATH=/bin:/sbin:/usr/sbin:/usr/bin /bin/sh -c "make clean && make && make load"