[issue514] patch to randomize mmap offsets

[Samuel J. Greear]

> :
> :What's the attack vector when mmap offsets are predictable?
> :
> :Sam
>
>    I'm well aware that predictable offsets make code replacement
>    attacks easier.  I just don't think the best solution is to jumble
>    stuff up to the point where programs no longer operate predictably.
>
>                                        -Matt
>                                        Matthew Dillon
>                                        <dillon at backplane.com>

That's actually what I was asking :) -- I wasn't attempting to make a
point or etc.

Sam