Glad to see the questions raised but I fail to see how free will can at all be compared to buffer overflow or how in doing so we draw any closer to an explanation or understanding of its existence. I think if your goal is merely to show that free will can't be discounted by the laws of the known universe you're better off comparing it to "strange matter," things that share physical properties with most matter but are missing fundamental blocks of what we call matter like mass (gravitons) or interaction with matter (neutrinos). That allows us to say that if this "strange matter" can violate those rules, there is the possibility that something exists in the universe that operates on the fringe of known matter, still interacting but violating most of what we consider "rules" regarding matter's existence, perhaps even allowing us to operate freely. In computing terms, free will is probably more like a systemic computer, maybe it's more easily understood as a human's ability to reprogram itself. A highly evolved, biological machine capable of reprogramming itself. Although that just begs the question since the reprogrammer must still be programmed at some higher level to follow commands. The process of making a biological machine like that is a blast, but they're wildly unpredictable, as you would expect anything truly capable of freely reprogramming itself would be. ;)