FreeBSD-module-SA-11-05.unix is a project mainly written in C, it's free.
FreeBSD Security Advisory SA-11:05.unix workaround
This module checks the length of the sockaddr passed into bind(2) and connect(2) for proper length. This should address the SA-11:05.unix advisory.
env PATH=/bin:/sbin:/usr/sbin:/usr/bin /bin/sh -c "make clean && make && make load"