Make libfuzzer-sys available to product and vendor am: f0a3f98be2 am: 7139ba0523 am: 178ca0741e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/libfuzzer-sys/+/2475946

Change-Id: I28f7cbd39a71f38e11912f7476a2e94d02d00b67
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: fb5f91a0b6ecc9dc0229fad0f71e4c8fdf97d5a9
  1. .github/
  2. ci/
  3. libfuzzer/
  4. src/
  5. .cargo_vcs_info.json
  6. .gitignore
  7. Android.bp
  8. build.rs
  9. Cargo.toml
  10. Cargo.toml.orig
  11. cargo2android.json
  12. CHANGELOG.md
  13. LICENSE
  14. LICENSE-APACHE
  15. LICENSE-MIT
  16. METADATA
  17. MODULE_LICENSE_APACHE2
  18. MODULE_LICENSE_MIT
  19. OWNERS
  20. README.md
  21. rust-toolchain
  22. update-libfuzzer.sh
README.md

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.