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  1. 456a892 Upgrade rust/crates/libfuzzer-sys to 0.4.2 am: 577945a102 am: 6d1535b6bc by Joel Galenson · 4 months ago master
  2. 6d1535b Upgrade rust/crates/libfuzzer-sys to 0.4.2 am: 577945a102 by Joel Galenson · 4 months ago
  3. 577945a Upgrade rust/crates/libfuzzer-sys to 0.4.2 by Joel Galenson · 4 months ago android-s-beta-4 android-s-beta-5 android-s-beta-3
  4. 6787f89 Merge "Upgrade rust/crates/libfuzzer-sys to 0.4.1" am: f0dd9f2bff am: 35ec03e672 by Joel Galenson · 4 months ago
  5. 35ec03e Merge "Upgrade rust/crates/libfuzzer-sys to 0.4.1" am: f0dd9f2bff by Joel Galenson · 4 months ago

The libfuzzer-sys Crate

Barebones wrapper around LLVM's libFuzzer runtime library.

The CPP parts are extracted from compiler-rt git repository with git filter-branch.

libFuzzer relies on LLVM sanitizer support. The Rust compiler has built-in support for LLVM sanitizer support, for now, it's limited to Linux. As a result, libfuzzer-sys only works on Linux.

Usage

Use cargo fuzz!

The recommended way to use this crate with cargo fuzz!.

Manual Usage

This crate can also be used manually as following:

First create a new cargo project:

$ cargo new --bin fuzzed
$ cd fuzzed

Then add a dependency on the fuzzer-sys crate and your own crate:

[dependencies]
libfuzzer-sys = "0.4.0"
your_crate = { path = "../path/to/your/crate" }

Change the fuzzed/src/main.rs to fuzz your code:

#![no_main]

use libfuzzer_sys::fuzz_target;

fuzz_target!(|data: &[u8]| {
    // code to fuzz goes here
});

Build by running the following command:

$ cargo rustc -- \
    -C passes='sancov' \
    -C llvm-args='-sanitizer-coverage-level=3' \
    -C llvm-args='-sanitizer-coverage-inline-8bit-counters' \
    -Z sanitizer=address

And finally, run the fuzzer:

$ ./target/debug/fuzzed

Updating libfuzzer from upstream

./update-libfuzzer.sh <github.com/llvm-mirror/llvm-project SHA1>

License

All files in libfuzzer directory are licensed NCSA.

Everything else is dual-licensed Apache 2.0 and MIT.