926cfebd6b
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| .. | ||
| Makefile | ||
| README | ||
| README.md | ||
| driverbin.c | ||
| drivermc.c | ||
| fuzz_decode_platform.c | ||
| fuzz_diff.c | ||
| fuzz_disasm.c | ||
| fuzz_disasm.options | ||
| fuzz_harness.c | ||
| fuzz_llvm.cpp | ||
| fuzzit.sh | ||
| fuzzitid.txt | ||
| onefile.c | ||
| platform.c | ||
| platform.h | ||
README.md
Fuzzing
Build the fuzz target
To build the fuzz target, you can simply run make with appropriate flags set :
ASAN_OPTIONS=detect_leaks=0 CXXFLAGS="-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -fsanitize=address -fsanitize=fuzzer-no-link" CFLAGS="-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -fsanitize=address -fsanitize=fuzzer-no-link" LDFLAGS="-fsanitize=address" make
You can replace address with another sanitizer : memory or undefined
The fuzz target is then suite/fuzz/fuzz_bindisasm2
You can find this in travis configuration .travis.yml
Another way is to use oss-fuzz, see https://github.com/google/oss-fuzz/blob/master/projects/capstone/build.sh
Troubleshooting
If you get cc: error: unrecognized argument to ‘-fsanitize=’ option: ‘fuzzer’ check if you have a workable
version of libfuzz installed. Also try to build with CC=clang make
Fuzz drivers
There are custom drivers :
- driverbin.c : prints cstool command before running one input
- drivermc.c : converts MC test data to raw binary data before running as many inputs as there are lines in a file
- onefile.c : simple one file driver
For libfuzzer, the preferred main function is now to use linker option -fsanitize=fuzzer
Fuzzit integration
Travis will build the fuzz target with the different sanitizers. Then, Travis will launch sanity fuzzit jobs as part of continuous integration (for each of the sanitizers) The fuzzit target ids are stored in a configuration file fuzzitid.txt and used by fuzzit.sh