[llvm-dev] LibFuzzer and platforms availability

[Kostya Serebryany via llvm-dev]

On Thu, Sep 10, 2015 at 2:14 PM, AlexDenisov <1101.debian at gmail.com> wrote:

> That’s great, thank you for patch.
>
> > r247321 refactors the code so that it should build on Mac.
> > I haven't actually tested it on Mac -- so please help me and send follow
> up patches if needed.
>
>
> I can confirm that first example worked as expected (with some additions:
> '-I path_to_compiler_rt/include' when build LibFuzzer and
> ‘-lclang_rt.asan_osx_dynamic -L path_to_libs/clang/3.8.0/lib/darwin’).
>

Weird. This should not be needed if -fsanitize=address is provided to the
link command.


>
> > check-fuzzer will still fail because some of the libFuzzer tests require
> dfsan.
>
> make doesn’t see check-fuzzer rule, seems it’s disabled somewhere in
> CMakeLists, I’m going to investigate.
>

check-fuzzer appears only with cmake option
-DLLVM_USE_SANITIZE_COVERAGE=YES
See http://llvm.org/docs/LibFuzzer.html#fuzzing-components-of-llvm
I never tried it Mac though


>
> > I'll try to commit such patches later this week, but I don't have a Mac
> so it will be harder for me to test.
>
> Please, don’t hesitate to CC me and I’ll run tests on my machine.
>
> > If anyone wants it quicker -- patches are welcome.
>
> I’d be happy to send them, but I know nothing about LibFuzzer internals :)
>

That should be done not in libFuzzer code, but in CMake files in
lib/Fuzzer/test


> --
> AlexDenisov
> Software Engineer, http://lowlevelbits.org
>
> > On 10 Sep 2015, at 20:52, Kostya Serebryany <kcc at google.com> wrote:
> >
> > r247321 refactors the code so that it should build on Mac.
> > I haven't actually tested it on Mac -- so please help me and send follow
> up patches if needed.
> >
> > check-fuzzer will still fail because some of the libFuzzer tests require
> dfsan.
> > I'd use some help from someone with a Mac to modify
> lib/Fuzzer/test/CMakeLists.txt so that it does not run dfsan-dependent
> tests on Mac.
> >
> > Thanks,
> >
> > --kcc
> >
> > On Wed, Sep 9, 2015 at 9:41 AM, Kostya Serebryany <kcc at google.com>
> wrote:
> >
> >
> > On Wed, Sep 9, 2015 at 12:57 AM, AlexDenisov via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> > Hi there.
> >
> > I’m trying to use LibFuzzer on OSX and face some issues:
> > I checked out LibFuzzer documentation[1] and managed to proceed until
> the final step of the first example.
> > Now I see linker errors related to dfsan, dfsan’s documentation[2]
> states explicitly “DataFlowSanitizer is a work in progress, currently under
> development for x86_64 Linux.”.
> >
> > Yes, libFuzzer does not build on OSX today.
> > Marshall (CC-ed) has managed to make it work with a couple of #ifdefs in
> FuzzerTraceState.cpp.
> >
> > I'll try to commit such patches later this week, but I don't have a Mac
> so it will be harder for me to test.
> > If anyone wants it quicker -- patches are welcome.
> > I would also appreciate if someone can set up a build bot for libFuzzer
> on Mac :)
> > (similar to lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fuzzer)
> >
> >
> > Does it mean that LibFuzzer available only on Linux platform? Can
> somebody confirm or refute my conclusion?
> >
> > [1] http://llvm.org/docs/LibFuzzer.html
> > [2] http://clang.llvm.org/docs/DataFlowSanitizer.html
> > --
> > AlexDenisov
> > Software Engineer, http://lowlevelbits.org
> >
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >
> >
> >
>
>
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