[question] Saving valid inputs

[igor-simoes]

Hi everyone,

Currently, I'm working with JS interpreters and I want to know if there is a way to use "muttest" and "gentest" saving all valid inputs?

For example if I ran "muttest", the new files generated are removed after each iteration. I want to store/save them if Quickfuzz generate an file that pass without throws SyntaxError or ReferenceError.

Thanks

[agustinmista]

Hi there! Sorry for the delay.

Your intended use case is somewhat different from what we expect from this tool. QuickFuzz is only able to recognize crashes and "fail" exit codes. Your JS interpreter probably returns success exit codes for SyntaxError or ReferenceError failing inputs, hence the problem.

However, if you can modify your target JS interpreter to return an specific exit code when it receives a "valid" input, then modifying QuickFuzz to save valid test cases should be quite straightforward. Is this the case?

/Agustín

[igor-simoes]

Hi Agustín, thanks for your answer.

I'm interested on getting all entries generated by Quickfuzz using muttest feature.
I found a workaround for this using:
quickfuzz muttest js "cat @@" inputs/ -q 1 -v > outdir/test.js