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doc: add section about improving fuzzing corpora

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We want to encourage contributions to the seed corpora that improve
coverage.
This commit is contained in:
Matt Morehouse 2023-03-20 11:36:42 -05:00 • committed by Rusty Russell
parent 6e11a2e416
commit ca80dee514
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doc/FUZZING.md
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@ -60,7 +60,43 @@ The latter will run all targets two by two `12345` times.
If you want to contribute new seeds, be sure to merge your corpus with the main one:
```
./tests/fuzz/run.py my_locally_extended_fuzz_corpus -j2 --generate --runs 12345
./tests/fuzz/run.py main_fuzz_corpus --merge_dir my_locally_extended_fuzz_corpus
./tests/fuzz/run.py tests/fuzz/corpora --merge_dir my_locally_extended_fuzz_corpus
```
## Improve seed corpora
If you find coverage increasing inputs while fuzzing, please create a pull
request to add them into `tests/fuzz/corpora`. Be sure to minimize any additions
to the corpora first.
### Example
Here's an example workflow to contribute new inputs for the `fuzz-addr` target.
Create a directory for newly found corpus inputs and begin fuzzing:
```shell
mkdir -p local_corpora/fuzz-addr
./tests/fuzz/fuzz-addr -jobs=4 local_corpora/fuzz-addr tests/fuzz/corpora/fuzz-addr/
```
After some time, libFuzzer may find some potential coverage increasing inputs
and save them in `local_corpora/fuzz-addr`. We can then merge them into the seed
corpora in `tests/fuzz/corpora`:
```shell
./tests/fuzz/run.py tests/fuzz/corpora --merge_dir local_corpora
```
This will copy over any inputs that improve the coverage of the existing corpus.
If any new inputs were added, create a pull request to improve the upstream seed
corpus:
```shell
git add tests/fuzz/corpora/fuzz-addr/*
git commit
...
```