为了解决符号执行中路径爆炸、新路径发现率低等问题，提出了针对文件格式数据块约束的符号执行分析方法（FFCBSE，File Format Constraint Based Symbolic Execution）优化框架.文件格式信息的缺失会影响符号执行的效率以及测试用例生成，该方法通过分析程序代码自动分析程序读取的格式文件数据块之间的依赖关系并建立相关约束，随后使用这些约束引导符号执行更关注于核心功能代码区域.在KLEE中实现了上述优化框架，并对Tcpdump、Readelf、Elfdump、File、Zlib等7个常用文件处理程序做了检测.和KLEE以及DASE相比，FFCBSE发现了13个之前未知的缺陷，在指令覆盖率和分支覆盖率有10%~225%不同程度的提升.
Abstract
To solve problems like path explosion, low rate of new path's finding in the software testing, a new vulnerability discovering architecture based on file format constraint (FFCBSE) was proposed. FFCBSE analyzed program source code to extract file structure constraints automatically. FFCBSE then used these structure constraints to guide symbolic execution to focus on core functions. This architecture was implemented in KLEE, and it was evaluated on seven file processing applications, such as Tcpdump, Readelf, File, Zlib. Compare with KLEE and DASE, FFCBSE detects thirteen previously unknown bugs. In addition, FFCBSE increases instruction line coverage/branch coverage by 10%~225%.
关键词
符号执行 /
文件格式 /
路径爆炸 /
缺陷查找
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Key words
symbolic execution /
file format constraint /
path explosion /
bug finding
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中图分类号：
TP311
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参考文献
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脚注
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基金
中国科学院战略性先导科技专项 (No.XDA-Y01-01）
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