DLAP: A Deep Learning Augmented Large Language Model Prompting framework for software vulnerability detection

Software vulnerability detection is generally supported by automated static analysis tools, which have recently been reinforced by deep learning (DL) models. However, despite the superior performance of DL-based approaches over rule-based ones in research, applying DL approaches to software vulnerability detection in practice remains a challenge. This is due to the complex structure of source code, the black-box nature of DL, and the extensive domain knowledge required to understand and validate the black-box results for addressing tasks after detection. Conventional DL models are trained by specific projects and, hence, excel in identifying vulnerabilities in these projects but not in others. These models with poor performance in vulnerability detection would impact the downstream tasks such as location and repair. More importantly, these models do not provide explanations for developers to comprehend detection results. In contrast, Large Language Models (LLMs) with prompting techniques achieve stable performance across projects and provide explanations for results. However, using existing prompting techniques, the detection performance of LLMs is relatively low and cannot be used for real-world vulnerability detections. This paper contributes DLAP, a Deep Learning Augmented LLMs Prompting framework that combines the best of both DL models and LLMs to achieve exceptional vulnerability detection performance. Experimental evaluation results confirm that DLAP outperforms state-of-the-art prompting frameworks, including role-based prompts, auxiliary information prompts, chain-of-thought prompts, and in-context learning prompts, as well as fine-turning on multiple metrics.