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# Building and Testing ClamAV with Fuzzing Sanitizers

## Build & Reproduce Fuzz Reports using OSS-Fuzz Tools

Check out the google/oss-fuzz repository and the `clamav` repo side by side. .

Then inside the `oss-fuzz` directory, run:

    python3 infra/helper.py build_image clamav
    python3 infra/helper.py build_fuzzers --sanitizer address clamav ../clamav
    python3 infra/helper.py reproduce clamav clamav_scanmap_fuzzer /path/to/poc_file

> Tip: You can substitute `address` argument in the second command that selects the Address Sanitizer (ASan) with `memory` or `undefined` to use the Memory Sanitizer (MSan) or the Undefined Behavior Sanitizer (UBSan).

See https://google.github.io/oss-fuzz/advanced-topics/reproducing/ for more details.

## Build & Test Fuzz Targets Sanitizers in CMake

Inside your `clamav` git clone, run:

    mkdir build-fuzz && cd build-fuzz

    export CC=`which clang` && \
        export CXX=`which clang++` && \
        export SANITIZER=address && \
        cmake .. -G Ninja \
            -D OPTIMIZE=OFF \
            -D CMAKE_BUILD_TYPE="Debug" \
            -D ENABLE_FUZZ=ON \
        && \
        ninja

This will build the fuzz target executables in the `build-fuzz/fuzz/` directory. You can run them just like a regular program, passing the file as input.

E.g.:

    ./fuzz/clamav_scanfile_fuzzer /path/to/poc_file