Recently, many Deep Learning fuzzers have been proposed for testing of DL libraries. However, they either perform unguided input generation (e.g., not considering the relationship between API arguments when generating inputs) or only support a limited set of corner case test inputs. Furthermore, a substantial number of developer APIs crucial for library development remain untested, as they are typically not well-documented and lack clear usage guidelines. To fill this gap, we propose a novel fuzzer named Orion, which combines guided test input generation and corner case test input generation based on a set of fuzzing rules constructed from historical data that is known to trigger vulnerabilities in the implementation of DL APIs. To extract the fuzzing rules, we first conduct an empirical study regarding the root cause analysis of 376 vulnerabilities in two of the most popular DL libraries, i.e., PyTorch and TensorFlow. We then construct the rules based on the root causes of the historical vulnerabilities. Our evaluation shows that Orion reports 135 vulnerabilities on the latest releases of TensorFlow and PyTorch, 76 of which were confirmed by the library developers. Among the 76 confirmed vulnerabilities, 69 are previously unknown, and 7 have already been fixed. The rest are awaiting further confirmation. Regarding end-user APIs, Orion was able to detect 31.8% and 90% more vulnerabilities on TensorFlow and PyTorch, respectively, compared to the state-of-the-art conventional fuzzer, i.e., DeepRel. When compared to the state-of-the-art LLM-based DL fuzzer, AtlasFuzz, Orion detected 13.63% more vulnerabilities on TensorFlow and 18.42% more vulnerabilities on PyTorch. Regarding developer APIs, Orion stands out by detecting 117% more vulnerabilities on TensorFlow and 100% more vulnerabilities on PyTorch compared to the most relevant fuzzer designed for developer APIs, such as FreeFuzz.

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