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Just In Time! Hooking Java Methods

License: MIT

Overview

This project showcases how to easily hook Java methods by acquiring the JIT compiled code address and applying a detour.

You can find the full writeup here.

Demo

A demo can be found here.

Features

  • Easy detection of JIT entrypoints
  • Simple hook interface with examples
  • Force compilation of a Java methods not yet compiled

Requirements

  • A java application to hook
  • Knowledge of the class and method name/signature to hook
  • Address of CompileBroker::compile_method
  • CMake
  • C++17 compiler

Dependencies

This project uses hde64 for disassembly, which is developed by Vyacheslav Patkov.

Building

To build the project, please use the provided CMakeLists.txt file.

mkdir build
cd build
cmake .. -G "Visual Studio 17 2022" -T host=x64 -A x64
cmake --build . --config Release

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Disclaimer

This project is for educational purposes only.

I am well aware that a lot of the code is not production ready and that there are a lot of things that could be improved.