The fix for this needs to be done in the VBox guest modules code. Kernels 3.5 and up do no longer export do_mmap() as public symbol, and I doubt they ever will. do_mmap() has been used in the gest modules code in a problematic way (as pointed out in http://lkml.org/lkml/2012/6/4/62), and the fix for this won't be easy or quick, if I understood the LKML poster right. So it won't be fixed in a future kernel release but will need to be fixed in a future VBox (guest modules) release.
The fix for this needs to be done in the VBox guest modules code. Kernels 3.5 and up do no longer export do_mmap() as public symbol, and I doubt they ever will. do_mmap() has been used in the gest modules code in a problematic way (as pointed out in http:// lkml.org/ lkml/2012/ 6/4/62), and the fix for this won't be easy or quick, if I understood the LKML poster right. So it won't be fixed in a future kernel release but will need to be fixed in a future VBox (guest modules) release.