radamsa VS jazzer

Ex Radmasa

I used to use radamsa to make my own fuzzer, but it does not support regex to generate datas.

At simplest and most straight forward level fuzz testing is pretty simple to get started with. Collect some input(API calls, files, etc.), pass it to fuzzer(for example radamsa[0]), throw it at program and observe...

Ofc, depending on system collecting input and sending it to system might be bit more complicated. Hardest part is often the observing and finding that an error happens.

Not that this gets you full coverage, for more complex things like protocols something custom that takes lot more effort is probably needed.

[0] https://gitlab.com/akihe/radamsa

Check out Jazzer, the code intelligence blog, and search for custom sanitizers for Java etc. https://github.com/CodeIntelligenceTesting/jazzer

Input Generation: The tester uses a fuzzing tool such as CI Fuzz or Jazzer to generate random or unexpected inputs to the software application.

Fuzzing is a testing technique where random values are generated as inputs to find unexpected behavior such as crashes and security issues. Previously we looked at the new Golang release 1.18 which includes native fuzzing and our Core Technology blog series contained a post that compares symbolic execution to different other testing techniques, including fuzzing. Today, we will dive into the Java world and check out the most popular Java fuzzing solution: Jazzer.

Coverage-guided fuzzer for Java

$ git clone https://github.com/CodeIntelligenceTesting/jazzer $ cd jazzer $ ./bazelisk-linux-amd64 run //:jazzer Starting local Bazel server and connecting to it... INFO: Analyzed target //:jazzer (79 packages loaded, 1410 targets configured). INFO: Found 1 target... Target //:jazzer up-to-date: bazel-bin/jazzer INFO: Elapsed time: 43.920s, Critical Path: 7.21s INFO: 83 processes: 4 internal, 79 linux-sandbox. INFO: Build completed successfully, 83 total actions INFO: Build completed successfully, 83 total actions driver/jazzer_driver: error while loading shared libraries: libjvm.so: cannot open shared object file: No such file or directory

One of the authors of Jazzer here. Feel free to ask any questions regarding Jazzer (https://github.com/CodeIntelligenceTesting/jazzer) or how to integrate Java/JVM projects into OSS-Fuzz.