What Your Firmware Tells You Is Not How You Should Emulate It: A Specification-Guided Approach for Firmware Emulation (Extended Version)
Wei Zhou, Lan Zhang, Le Guan, Peng Liu, Yuqing Zhang

TL;DR
This paper introduces a specification-guided firmware emulation approach that uses NLP to generate peripheral models from documentation, improving fidelity and bug detection in microcontroller firmware analysis.
Contribution
It presents a novel method combining NLP and symbolic execution to dynamically synthesize peripheral models from specifications, addressing limitations of existing firmware emulation techniques.
Findings
Achieves higher emulation fidelity than state-of-the-art solutions.
Effectively detects bugs caused by race conditions.
Reduces false positives in fuzzing through accurate emulation.
Abstract
Emulating firmware of microcontrollers is challenging due to the lack of peripheral models. Existing work finds out how to respond to peripheral read operations by analyzing the target firmware. This is problematic because the firmware sometimes does not contain enough clues to support the emulation or even contains misleading information (e.g. buggy firmware). In this work, we propose a new approach that builds peripheral models from the peripheral specification. Using NLP, we translate peripheral behaviors in human language (documented in chip manuals) into a set of structured condition-action rules. By checking, executing, and chaining them at runtime, we can dynamically synthesize a peripheral model for each firmware execution. The extracted condition-action rules might not be complete or even be wrong. We, therefore, propose incorporating symbolic execution to quickly pinpoint the…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsSoftware Testing and Debugging Techniques · Software System Performance and Reliability · Advanced Malware Detection Techniques
