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On Jul 25, 2013, at 3:43 AM, Sean Conner wrote:

>  As a side project, I'm playing around with bindings to ptrace().  ptrace()
> is a function that deals primarily with addresses [1].  On a 32-bit system
> there is no real issues [2] but on a 64-bit system it really is an issue
> [3].

Bet it isn't. Which architecture is handing you userspace pointers outside the range of precise 64-bit doubles? (Amusingly you even get additional range if the pointers are 4-byte aligned.)