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LLM decompilers can hide behavioral changes behind passing tests

arxiv.org 3 min read Editor score 7/10

The paper reports that recompiled decompiler output can pass shipped tests yet diverge on other legitimate inputs, and can even remove a disclosed vulnerability without showing the crash. Engineers evaluating LLM-generated code need stronger checks than build success and narrow test suites.

What: LLM decompilers turn compiled machine code into clean C, but recompilability and shipped tests can miss changed behavior.
Method: Decompile-Diverge synthesizes a driver, builds a fuzzing corpus from the reference, and reruns decompiled code on the same inputs.
Why it matters: Engineers assessing decompiled code need behavioral checks: passing tests can hide changed behavior or erase a vulnerability's crash.

Decompile-Diverge compares decompiled code with the reference using inputs from a growing fuzzing corpus. Sketched from the article's own text.

Read on arxiv.org → Lobsters

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