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Update docs and Changelog for custom_mutators (#355)

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Rishi Ranjan
2020-05-09 03:31:11 +05:30
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docs/Changelog.md
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@ -2574,3 +2574,6 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
### Version 0.21b (2013-11-12):
- Initial public release.
- Added support for use of multiple custom mutators which can be specified using
the environment variable AFL_CUSTOM_MUTATOR_LIBRARY.

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docs/custom_mutators.md
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@ -16,6 +16,10 @@ fuzzing by using libraries that perform mutations according to a given grammar.
The custom mutator is passed to `afl-fuzz` via the `AFL_CUSTOM_MUTATOR_LIBRARY`
or `AFL_PYTHON_MODULE` environment variable, and must export a fuzz function.
Now afl also supports multiple custom mutators which can be specified in the same `AFL_CUSTOM_MUTATOR_LIBRARY` environment variable like this.
```bash
export AFL_CUSTOM_MUTATOR_LIBRARY="full/path/to/mutator_first.so;full/path/to/mutator_second.so"
```
Please see [APIs](#2-apis) and [Usage](#3-usage) for detail.
The custom mutation stage is set to be the first non-deterministic stage (right before the havoc stage).