Holy crap, that was brutal. I don't think you can get any closer to accusing someone of incompetence without actually coming out and saying so directly. If Samsung et al are this cavalier about the trust zone, what is the state of the rest of their systems, which presumably have orders of magnitude more code? Suddenly, all the reports about the thousands of bugs in tizen don't seem like exaggerations anymore.

On a different note, how does the iPhone's trust zone implementation compare? Does anyone know if it is vulnerable to similar issues?