anonymous mmap() and random heap allocation

[Xianghua Xiao]

It seems mmap() can not do random allocation for malloc()/heap on
Linux, anyone used pax's 'mmap randonness' option for that? what's the
price for that?

I want to port openbsd's malloc() to linux to avoid heap
crashes(overrun/underrun), openbsd's malloc() can do random allocation
for security reasons, meanwhile it helps to avoid some
overrun/underrun crashes with no extra cost, the latter is what I'm
looking for.

thanks,
xianghua
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