Exec header kernel panic

A local user can cause a kernel panic using a specially crafted binary.  
The kernel will attempt to allocate too much memory and panic.

The problem was reported by Georgi Guninski, see also
http://www.guninski.com/msuxobsd1.html

A fix has been committed to 3.3 and 3.4 -stable branches.  Patches are 
also available at
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.4/common/005_exec.patch
and
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.3/common/010_exec.patch


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