I’m trying to use LibFuzzer on my Mac - following the directions here: http://llvm.org/docs/LibFuzzer.html.
But when I try to link my program and the Fuzzer object code, I get errors.
They appear to be symbols from compiler-rt that are missing.
Do I need a better (i.e, more recent) compiler-rt than the one that Apple ships?
Notes:
“totclang” → freshly built clang.
$ export FUZZER=$LLVM/llvm/lib/Fuzzer
$ cd ~/fuzz
$ cat regex_fuzz.cpp
#include
extern “C” void LLVMFuzzerTestOneInput(const unsigned char *data, size_t size) {
if (size > 0) {
std::regex re(std::string((const char *)data, size));
}
}
$ totclang -c -g -O2 -std=c++11 -I $FUZZER $FUZZER/.cpp
$ totclang -g -fsanitize=address -fsanitize-coverage=edge,indirect-calls,8bit-counters -c -std=c++11 regex_fuzz.cpp
$ totclang -g -fsanitize=address Fuzzer.o regex_fuzz.o -Wl
Undefined symbols for architecture x86_64:
“_dfsan_create_label”, referenced from:
fuzzer::TraceState::DFSanCmpCallback(unsigned long, unsigned long, unsigned long, unsigned long long, unsigned long long, unsigned short, unsigned short) in FuzzerTraceState.o
fuzzer::Fuzzer::InitializeTraceState() in FuzzerTraceState.o
“_dfsan_get_label_info”, referenced from:
fuzzer::TraceState::GetLabelRange(unsigned short) in FuzzerTraceState.o
“_dfsan_read_label”, referenced from:
_dfsan_weak_hook_memcmp in FuzzerTraceState.o
“_dfsan_set_label”, referenced from:
fuzzer::Fuzzer::InitializeTraceState() in FuzzerTraceState.o
ld: symbol(s) not found for architecture x86_64
clang-3.7: error: linker command failed with exit code 1 (use -v to see invocation)
– Marshall
