Libafl

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
    // Call your code with fuzzer-provided data
    my_function(data, size);
    return 0;
}

git clone https://github.com/AFLplusplus/LibAFL
cd LibAFL/libafl_libfuzzer_runtime
./build.sh

clang++ -DNO_MAIN -g -O2 -fsanitize=fuzzer-no-link libFuzzer.a harness.cc main.cc -o fuzz
./fuzz corpus/

apt install clang

wget https://apt.llvm.org/llvm.sh
chmod +x llvm.sh
sudo ./llvm.sh 15

export RUSTFLAGS="-C linker=/usr/bin/clang-15"
export CC="clang-15"
export CXX="clang++-15"

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

apt install libssl-dev pkg-config

rustup toolchain install nightly --component llvm-tools

cd LibAFL/libafl_libfuzzer_runtime
./build.sh
# Should produce libFuzzer.a

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
    // Your fuzzing target code here
    return 0;
}

clang++ -DNO_MAIN -g -O2 -fsanitize=fuzzer-no-link libFuzzer.a harness.cc main.cc -o fuzz

./fuzz corpus/

./fuzz -fork=1 -ignore_crashes=1 corpus/

cargo init --lib my_fuzzer
cd my_fuzzer
cargo add libafl@0.13 libafl_targets@0.13 libafl_bolts@0.13 libafl_cc@0.13 \
  --features "libafl_targets@0.13/libfuzzer,libafl_targets@0.13/sancov_pcguard_hitcounts"

[lib]
crate-type = ["staticlib"]

use libafl::prelude::*;
use libafl_bolts::prelude::*;
use libafl_targets::{libfuzzer_test_one_input, std_edges_map_observer};

#[no_mangle]
pub extern "C" fn libafl_main() {
    let mut run_client = |state: Option<_>, mut restarting_mgr, _core_id| {
        // 1. Setup observers
        let edges_observer = HitcountsMapObserver::new(
            unsafe { std_edges_map_observer("edges") }
        ).track_indices();
        let time_observer = TimeObserver::new("time");

        // 2. Define feedback
        let mut feedback = feedback_or!(
            MaxMapFeedback::new(&edges_observer),
            TimeFeedback::new(&time_observer)
        );

        // 3. Define objective
        let mut objective = feedback_or_fast!(
            CrashFeedback::new(),
            TimeoutFeedback::new()
        );

        // 4. Create or restore state
        let mut state = state.unwrap_or_else(|| {
            StdState::new(
                StdRand::new(),
                InMemoryCorpus::new(),
                OnDiskCorpus::new(&output_dir).unwrap(),
                &mut feedback,
                &mut objective,
            ).unwrap()
        });

        // 5. Setup mutator
        let mutator = StdScheduledMutator::new(havoc_mutations());
        let mut stages = tuple_list!(StdMutationalStage::new(mutator));

        // 6. Setup scheduler
        let scheduler = IndexesLenTimeMinimizerScheduler::new(
            &edges_observer,
            QueueScheduler::new()
        );

        // 7. Create fuzzer
        let mut fuzzer = StdFuzzer::new(scheduler, feedback, objective);

        // 8. Define harness
        let mut harness = |input: &BytesInput| {
            let buf = input.target_bytes().as_slice();
            libfuzzer_test_one_input(buf);
            ExitKind::Ok
        };

        // 9. Setup executor
        let mut executor = InProcessExecutor::with_timeout(
            &mut harness,
            tuple_list!(edges_observer, time_observer),
            &mut fuzzer,
            &mut state,
            &mut restarting_mgr,
            timeout,
        )?;

        // 10. Load initial inputs
        if state.must_load_initial_inputs() {
            state.load_initial_inputs(
                &mut fuzzer,
                &mut executor,
                &mut restarting_mgr,
                &input_dir
            )?;
        }

        // 11. Start fuzzing
        fuzzer.fuzz_loop(&mut stages, &mut executor, &mut state, &mut restarting_mgr)?;
        Ok(())
    };

    // Launch fuzzer
    Launcher::builder()
        .run_client(&mut run_client)
        .cores(&cores)
        .build()
        .launch()
        .unwrap();
}

clang++-15 -DNO_MAIN -g -O2 \
  -fsanitize-coverage=trace-pc-guard \
  -fsanitize=address \
  -Wl,--whole-archive target/release/libmy_fuzzer.a -Wl,--no-whole-archive \
  main.cc harness.cc -o fuzz

use libafl_cc::{ClangWrapper, CompilerWrapper, Configuration, ToolWrapper};

pub fn main() {
    let args: Vec<String> = env::args().collect();
    let mut cc = ClangWrapper::new();
    cc.cpp(is_cpp)
      .parse_args(&args)
      .link_staticlib(&dir, "my_fuzzer")
      .add_args(&Configuration::GenerateCoverageMap.to_flags().unwrap())
      .add_args(&Configuration::AddressSanitizer.to_flags().unwrap())
      .run()
      .unwrap();
}

cargo build --release
target/release/libafl_cxx -DNO_MAIN -g -O2 main.cc harness.cc -o fuzz

./fuzz --cores 0 --input corpus/

./fuzz --cores 0,8-15 --input corpus/

./fuzz --cores 0-7 --input corpus/ --output crashes/ --timeout 1000

./fuzz -tui=1 corpus/

let backtrace_observer = BacktraceObserver::owned(
    "BacktraceObserver",
    libafl::observers::HarnessType::InProcess
);

let mut executor = InProcessExecutor::with_timeout(
    &mut harness,
    tuple_list!(edges_observer, time_observer, backtrace_observer),
    &mut fuzzer,
    &mut state,
    &mut restarting_mgr,
    timeout,
)?;

let mut objective = feedback_and!(
    feedback_or_fast!(CrashFeedback::new(), TimeoutFeedback::new()),
    NewHashFeedback::new(&backtrace_observer)
);