> From: Theo de Raadt <dera...@cvs.openbsd.org>
> Date: Thu, 04 Jul 2013 09:04:54 -0600
> I suspect the best approach would be a hybrid value.  The upper half
> of the address should try to land in an unmapped zone, or into the zero
> page, or into some address space hole, ir into super high memory above
> the stack which is gauranteed unmapped.

Don't forget strict alignment architectures, where it is beneficial
to have the lowest bit set to trigger alignment traps.

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