OptFuzz

OptFuzz: Optimization Path Guided Fuzzing for JavaScript JIT Compilers (Usenix Security 2024)

1.Compile Clang-14

Download LLVM-14 source code.

Replace llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp with llvm-14/SanitizerCoverage.cpp in this repository.

Modify the path of sancov.txt in llvm-14/SanitizerCoverage.cpp.

Compile LLVM, you can use the shell commands in llvm-14/run.sh.

2.Install hiredis

Optfuzz use redis to record the number of OptPath, so we need install hiredis before run OptFuzz.

# install redis-server
sudo apt install redis

# install hiredis
git clone git@github.com:redis/hiredis.git
cd hiredis
make 
make install
cp libhiredis.so /usr/lib64 /usr/lib 
/sbin/ldconfig

Redis is used in optfuzz/FuzzilliCli/TerminalUI.swift and optfuzz/libcoverage/coverage.c.

3.Build JavaScritCore

Build JSC with webkit_for_optfuzz/run.sh, specify the clang path to the path compiled in the first step.

JSC commit id: 7e485991f408cd0d38734297936fc449c260fc2f

4.Build OptFuzz

Build:

swift build -c debug -Xlinker='-lrt' -Xlinker='-lhiredis'

Please Modify the path of data/optfuzz_path in optfuzz/libcoverage/coverage.c and webkit_for_optfuzz/Source/JavaScriptCore/jsc.cpp

Run:

swift run -c debug -Xlinker='-lrt' -Xlinker='-lhiredis' FuzzilliCli --jobs=10 --profile=jsc --overwrite --storagePath=./out ../webkit_for_optfuzz/optfuzz_build/Debug/bin/jsc