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19 lines
873 B
Markdown
19 lines
873 B
Markdown
# Choosing initial test cases
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To operate correctly, the fuzzer requires one or more starting file that
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contains a good example of the input data normally expected by the targeted
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application. There are two basic rules:
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- Keep the files small. Under 1 kB is ideal, although not strictly necessary.
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For a discussion of why size matters, see [perf_tips.md](perf_tips.md).
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- Use multiple test cases only if they are functionally different from
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each other. There is no point in using fifty different vacation photos
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to fuzz an image library.
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You can find many good examples of starting files in the testcases/ subdirectory
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that comes with this tool.
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PS. If a large corpus of data is available for screening, you may want to use
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the afl-cmin utility to identify a subset of functionally distinct files that
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exercise different code paths in the target binary. |