Abstract
Processors are important parts of a computer and have been believed to be secure for a long time. In recent years researches show that processors are, on the contrary, full of undocumented instructions which are caused by design flaws or intentionally hidden by manufacturers. Undocumented instructions can be detected using fuzzing technology. But currently existing methods have low efficiency and accuracy. Furthermore, to analyze the function of detected instructions, a classification method is necessary to reduce the large amount of detected undocumented instructions. Therefore, this paper introduces a high-efficiency instruction searching and classification method by applying instruction format analysis. Results show that our method can successfully find 10 times of the amount of detected undocumented instructions using existing tool with just 30% of executing time. Also, after classifying the large quantity of the detection results, the amount can be reduced to less than 10000 instructions which is a reasonable amount for further research.
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