[LLVMdev] DataFlowSanitizer only for Linux (original) (raw)

Alexander Potapenko glider at google.com
Wed Jul 8 06:42:50 PDT 2015

FWIW see also http://lists.cs.uiuc.edu/pipermail/cfe-dev/2015-June/043301.html As far as I understand DFSan functionality isn't required for libFuzzer to work, so it should be safe to disable DFSan support on Mac.

On Wed, Jul 8, 2015 at 7:45 AM, Kostya Serebryany <kcc at google.com> wrote:

+pcc , glider

On Mon, Jul 6, 2015 at 12:59 PM, Juan Ceasar <juan.d.ceasar at gmail.com> wrote:

Afternoon, I had an issue with trying to link a program with the DataFlowSanitizer functionality, this is from the libFuzzer project, and I was seeing: clang++ -fsanitize=address -fsanitize-coverage=edge testfuzzer.cc Fuzzer*.o Undefined symbols for architecture x8664: "dfsancreatelabel", 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 "dfsangetlabelinfo", referenced from: fuzzer::TraceState::GetLabelRange(unsigned short) in FuzzerTraceState.o ..... But then looking at the docs: http://clang.llvm.org/docs/DataFlowSanitizer.html It appears that this is only supported under Linux? Is that right? Correct. AFAICT, DFSan was only tested on Linux. It is quite hard to make it work on Mac because there are too many closed source libraries there. Nothing impossible though -- it's just that nobody has worked on it. libFuzzer was also never tested on Mac, but I think it should be trivial to make it work there. I suspect that the errors you see are caused by the weak function declarations which don't (???) work on Mac. You'll need to #ifdef the weak functions on Mac somehow. Patches and Mac buildbots are welcome :) --kcc

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