Tracked down the line that's overflowing.
Kees supplied the attached patch as a fix.
There appears to be other strcpy()'s that look risky to me in the code, but 
this patch should solve the immediate issue, and should provide an example of 
how to properly fix this in the other places.

** Bug watch added: freedesktop.org Bugzilla #19490
   https://bugs.freedesktop.org/show_bug.cgi?id=19490

** Also affects: xorg-server via
   https://bugs.freedesktop.org/show_bug.cgi?id=19490
   Importance: Unknown
       Status: Unknown

** Attachment added: "buffer_overflow.patch"
   http://launchpadlibrarian.net/21068947/buffer_overflow.patch

-- 
buffer overflow when executing 'xkbcomp -C :0'
https://bugs.launchpad.net/bugs/309013
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