[llvm] r234571 - [lib/Fuzzer] Section: How good is my fuzzer?

[Sean Silva]

I just wanted to say thanks for all this great documentation for LibFuzzer!

-- Sean Silva

On Thu, Apr 9, 2015 at 11:32 PM, Kostya Serebryany <kcc at google.com> wrote:

> Author: kcc
> Date: Fri Apr 10 01:32:29 2015
> New Revision: 234571
>
> URL: http://llvm.org/viewvc/llvm-project?rev=234571&view=rev
> Log:
> [lib/Fuzzer] Section: How good is my fuzzer?
>
> Modified:
>     llvm/trunk/docs/LibFuzzer.rst
>
> Modified: llvm/trunk/docs/LibFuzzer.rst
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/LibFuzzer.rst?rev=234571&r1=234570&r2=234571&view=diff
>
> ==============================================================================
> --- llvm/trunk/docs/LibFuzzer.rst (original)
> +++ llvm/trunk/docs/LibFuzzer.rst Fri Apr 10 01:32:29 2015
> @@ -256,6 +256,21 @@ You can run both fuzzers on the same cor
>
>  Periodically restart both fuzzers so that they can use each other's
> findings.
>
> +How good is my fuzzer?
> +----------------------
> +
> +Once you implement your target function ``TestOneInput`` and fuzz it to
> death,
> +you will want to know whether the function or the corpus can be improved
> further.
> +One easy to use metric is, of course, code coverage.
> +You can get the coverage for your corpus like this::
> +
> +  ASAN_OPTIONS=coverage_pcs=1 ./fuzzer CORPUS_DIR -runs=0
> +
> +This will run all the tests in the CORPUS_DIR but will not generate any
> new tests
> +and dump covered PCs to disk before exiting.
> +Then you can subtract the set of covered PCs from the set of all
> instrumented PCs in the binary,
> +see SanitizerCoverage_ for details.
> +
>  Fuzzing components of LLVM
>  ==========================
>
>
>
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