Linux 2.6.x fs/pipe.c local root exploit

For those who were not yet aware, there is at least 3 public exploits
since 11/05/2009 for CVE-2009-3547 targeting *all* linux kernels from
2.6.0 to 2.6.31 included. Since spender and fotis have already release
their own, there is not need for us to keep this on our hd.
ImpelDown.c is a poc trying to exploit null ptr dereference in fs/pipe.c
for *all* linux kernel from 2.6.0 to 2.6.31 and ImpelDown-2.6.31only.c
target only linux kernel version 2.6.31 (tested and approuved with
mmap_min_addr at 0).
If you were writing your own, you have already noticed that there is a
subtle difference in the way you can own kernels 2.6.0 up to 2.6.10 and
kernels 2.6.11 up to 2.6.31: in the first one the null ptr deref leads
to an arbitrary write to everywhere in the kernel since you have control
over the destination address of

linux2.6.9/fs/pipe.c

More info and exploit http://www.derkeiler.com/Mailing-Lists/Full-Disclosure/2009-11/msg00105.html