Fuzzer for libxaac decoder and encoder

This describes steps to build xaac_dec_fuzzer and xaac_enc_fuzzer binary.

Linux x86/x64

Requirements

• cmake (3.5 or above)
• make
• clang (6.0 or above) needs to support -fsanitize=fuzzer, -fsanitize=fuzzer-no-link

Steps to build

Clone libxaac repository

$ git clone https://android.googlesource.com/platform/external/libxaac

Create a directory inside libxaac and change directory

 $ cd libxaac
 $ mkdir build
 $ cd build

Build fuzzer with required sanitizers (-DSANITIZE=fuzzer-no-link is mandatory to enable fuzzers)

 $ cmake .. -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ \
   -DCMAKE_BUILD_TYPE=Debug -DSANITIZE=fuzzer-no-link,address,\
   signed-integer-overflow,unsigned-integer-overflow
 $ make

Steps to run

Create a directory CORPUS_DIR and copy some elementary aac files to that folder To run the fuzzer

$ ./xaac_dec_fuzzer CORPUS_DIR
$ ./xaac_enc_fuzzer CORPUS_DIR

Android

Steps to build

Build the fuzzer

  $ SANITIZE_TARGET=address SANITIZE_HOST=address mmma -j$(nproc) \
    external/libxaac/fuzzer

Steps to run

Create a directory CORPUS_DIR and copy some elementary aac files to that folder Push this directory to device.

To run on device

  $ adb sync data
  $ adb shell /data/fuzz/xaac_dec_fuzzer CORPUS_DIR

To run on host

  $ $ANDROID_HOST_OUT/fuzz/xaac_dec_fuzzer CORPUS_DIR

References:

• http://llvm.org/docs/LibFuzzer.html
• https://github.com/google/oss-fuzz