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ASFuzz: Detecting Linux Kernel Asynchronous Concurrency Bugs via Asynchronous Shadow Fuzzing
- Published
- Record updated
Summary
ASFuzz is an asynchronous fuzzing system for the Linux kernel that builds a Shadow Dependency Graph to model scheduling relations, context-matched resource relations, and operation types. Its dual-mode design uses coverage-guided exploration of synchronous paths alongside shadow execution that generates legal syscall programs to trigger asynchronous tasks in relevant synchronous contexts. Evaluated on Linux kernel versions 6.6 to 6.15, it found 14 previously unknown concurrency-related bugs, including 10 asynchronous concurrency bugs, and 5 of these have been assigned CVE identifiers.