execshield inspection needed

[Roland McGrath]

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The execshield patch has gotten much smaller than it was in the beginning.
It still hasn't gotten all the cleanup it could get though.  The patch does
a few different things that ideally would be in separate patches.

1. Segment-based PAGE_EXEC for no-NX hardware (and non-PAE 32-bit kernels).
   This is not really very much code.  There's the GPF trap handler,
   and the hooks like arch_add_exec_range et al.  I don't see why this
   couldn't be merged upstream as a config option.

2. Tighter permissions on /proc/pid/foo.  This would be simple to make a
   config option and is such a simple patch (fs/proc/base.c) it seems like
   it shouldn't be hard to get upstream.

3. get_unmapped_area_prot.  This is what changes the layouts and is the
   heart of what's really "exec-shield" since randomization has been upstream.

4. Miscellaneous tweaks and cruft.  There are strange little bits of diff
   that I don't know the explanation for.  Maybe we can clean these up.

I hope Ingo knows what any other bits in there are for.


Thanks,
Roland