Fuzzer for libxaac decoder

This describes steps to build xaac_dec_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 libxaac using cmake

 $ CC=clang CXX=clang++ cmake ../ \
   -DSANITIZE=fuzzer-no-link,address,signed-integer-overflow
 $ make

Build the fuzzer

 $ clang++ -std=c++11 -fsanitize=fuzzer,address -I.  -I../  -I../common \
   -I../decoder -I../decoder/drc_src -Wl,--start-group \
   ../fuzzer/xaac_dec_fuzzer.cpp -o ./xaac_dec_fuzzer ./libxaacdec.a \
   -Wl,--end-group

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

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