jazzer-custom-hooks

This repository shows how one could build custom hooks in a dedicated library and use them during a fuzzing run. The example is very contrived but shows how fuzzing blocks could be overcome by using custom hooks.

Project structure

• lib Library containing a custom hook.
• app Example application using methods intercepted by the custom hooks. Also includes a fuzz target to that just executes the main method of the application.

How-to

1. Install Jazzer as described in its readme
2. Build the whole project with Gradle

./gradlew build

3. Test the example application

java -jar app/build/libs/app.jar

4. Fuzz the application with Jazzer

jazzer --cp=app/build/libs/app.jar:lib/build/libs/lib.jar --custom_hooks=com.code_intelligence.hooks.ClockHooks --target_class=com.code_intelligence.example.ExampleFuzzTarget

5. Alternatively autofuzz the application

 jazzer --cp=app/build/libs/app.jar:lib/build/libs/lib.jar --custom_hooks=com.code_intelligence.hooks.ClockHooks --autofuzz=com.code_intelligence.example.ExampleApplication::main