The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.Referenceshttp://www.iss.net/security_center/static/7690.phphttp://archives.neohapsis.com/archives/bugtraq/2001-12/0014.htmlhttp://monkey.org/openbsd/archive/tech/0112/msg00015.html
