FreeBSD Security Advisory FreeBSD-SA-04:15.syscons – The syscons CONS_SCRSHOT ioctl(2) does insufficient validation of its input arguments. In particular, negative coordinates or large coordinates may cause unexpected behavior.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34580/FreeBSD-SA-04%3A15.syscons.txt
Source: https://packetstormsecurity.com/files/34580/FreeBSD-Security-Advisory-2004.15.html