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Ruzzy is a coverage-guided Ruby fuzzer by Trail of Bits.
Passed 22 of 22 test cases with the skill, and 10 of 22 without it.
and 15 more in the full report
12 fixed10 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
What exact code line must be present inside `test_tracer.rb` to instrument a pure Ruby target file named `test_harness.rb` for Ruzzy coverage guidance?
| Checked | Without skill | With skill |
|---|---|---|
| Invoke Ruzzy.trace('test_harness.rb'). | Missed | Passed |
The instructions your model reads when the skill loads.
Ruzzy is a coverage-guided fuzzer for Ruby built on libFuzzer. It enables fuzzing both pure Ruby code and Ruby C extensions with sanitizer support for detecting memory corruption and undefined behavior.
Ruzzy is currently the only production-ready coverage-guided fuzzer for Ruby.
Choose Ruzzy when:
Set up environment:
export ASAN_OPTIONS="allocator_may_return_null=1:detect_leaks=0:use_sigaltstack=0"
Test with the included toy example:
LD_PRELOAD=$(ruby -e 'require "ruzzy"; print Ruzzy::ASAN_PATH') \
ruby -e 'require "ruzzy"; Ruzzy.dummy'
This should quickly find a crash demonstrating that Ruzzy is working correctly.
Ruzzy supports Linux x86-64 and AArch64/ARM64. For macOS or Windows, use the Dockerfile or development environment.
test cases passed, vs 10 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.