FreebSD Security Advisory FreeBSD-SA-00:42 - The linux binary-compatability module implements a "shadow" filesystem hierarchy rooted in /compat/linux, which is overlayed against the regular filesystem hierarchy so that Linux binaries "see" files in the shadow hierarchy which can mask the native files. Filenames in this shadow hierarchy are treated incorrectly by the linux kernel module under certain circumstances, and a kernel stack overflow leading to a system compromise by an unprivileged user may be possible when very long filenames are used. ~