|0.4.0||Jul 17, 2023|
|0.3.0||Apr 7, 2023|
|0.2.3||Apr 1, 2023|
|0.2.0||Mar 22, 2023|
#413 in Development tools
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tree-crasher is an easy-to-use grammar-based black-box fuzzer. It parses a number of input files using tree-sitter grammars, and produces new files formed by splicing together their ASTs.
tree-crasher aims to occupy a different niche from more advanced grammar-based fuzzers like Gramatron, Nautilus, and Grammarinator. Rather than achieve maximal coverage and bug-finding through complete, hand-written grammars and complex techniques like coverage-based feedback, tree-crasher aims to achieve maximal ease-of-use by using off-the-shelf tree-sitter grammars and not requiring any instrumentation (nor even source code) for the target. In short, tree-crasher wants to be the Radamsa of grammar-based fuzzing.
tree-crasher uses treereduce to automatically minimize generated test-cases.
For more information, see the documentation.
When reading these examples, keep in mind that fuzzing can cause unpredictable behaviors. Always fuzz in a VM or Docker container with a memory limit, no network access, and no important files.
(By default, tree-crasher passes input to the target on stdin.)
Python's regex engine
rx.py like so:
import re import sys try: s = sys.stdin.read() r = re.compile(s) print(r.match(s)) except: pass
Put some sample regular expressions in
tree-crasher-regex corpus/ -- python3 $PWD/rx.py
tree-crasher has found many bugs in rustc. Here's how it was done! The special
@@ symbol on the command line gets replaced by the file generated by
tree-crasher-rust \ --interesting-stderr "(?m)^error: internal compiler error:" \ corpus \ -- \ rustc +nightly --crate-type=lib --emit=mir -Zmir-opt-level=4 @@.rs
(The regex syntax is that of the regex crate.)
See the documentation for more examples.
tree-crasher uses tree-splicer to generate test cases, see the list of bugs found in that project's README.
If you find a bug with tree-crasher, please let me know! One great way to do so would be to submit a PR to tree-splicer to add it to the README.
tree-crasher supports 9+ languages, see the documentation for details.
Documentation is available online or in