[llvm-dev] Applying for GSoC 2021(Fuzzing LLVM-IR Passes)

[Arthur Eubanks via llvm-dev]

https://llvm.org/docs/FuzzingLLVM.html looks like good background (if you
haven't already seen it).

On Mon, Mar 8, 2021 at 12:21 PM Johannes Doerfert via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi Chibin,
>
> apologies for the late reply.
>
> There have been multiple people that expressed interest in this project,
> though it is open ended and we might want to tackle it from different
> angles.
>
> Truth be told, anything towards testing LLVM would be OK with me. To name a
> few areas: mutation testing inputs (C/C++/LLVM-IR/...), reordering or
> skipping
> passes, creating an IR database for testing but maybe also other purposes.
>
> I'd also be interested in fuzzing the OpenMP frontend and runtime (both
> on the
> host and GPU) if that is something you might want to do. I think here is a
> plethora of crashes and hangs to be found, not to mention the
> correctness issues
> if we manage to do test generation for which we can verify the result.
>
> Given that you have experience building and extending LLVM already, I
> think a
> good next would be to narrow it down so you can start looking at the
> infrastructure
> we want to test, e.g., the pass manager builder if we want to swap
> passes to find
> hidden dependences between them. The existing fuzzer capabilities and
> the C++
> mutation testing developed outside of LLVM
> (https://github.com/mull-project/mull)
> are also good places to take a look.
>
> Let me know what of the above areas, or areas of your choosing, might be
> most
> interesting to you. We can also schedule a 30min chat, just send me an
> email with
> times that would work for you.
>
> ~ Johannes
>
>
> On 3/1/21 1:29 PM, Stefan Stipanovic wrote:
> > +Johannes Doerfert <johannesdoerfert at gmail.com>
> >
> > Hi Chibin,
> >
> > Johannes will give you more information, but you can always start by
> > familiarizing yourself with the Attributor.
> >
> > Stefan
> >
> > On Mon, Mar 1, 2021 at 6:11 PM 张驰斌 via llvm-dev <llvm-dev at lists.llvm.org
> >
> > wrote:
> >
> >> Hi LLVM developers,
> >>
> >>        I am a junior student majoring in Computer Science at
> ShanghaiTech
> >> University. I’ve been browsing through
> >> https://llvm.org/OpenProjects.html#gsoc21 and found out that LLVM is
> >> participating in Google Summer of Code 2021. I wanted to be sure to
> inquire
> >> about it and get in touch soon.
> >>
> >>        One project idea really caught my eyes, ‘Fuzzing LLVM-IR Passes,’
> >> striking chord with my experience. Currently, I am working with
> Professor
> >> Hao Chen (Contact author of the fuzzer Angora) and his fellow graduate
> >> students researching fuzzing.  My main contribution lies in the
> >> experimental evaluation part. I’ve written many scripts to automate the
> >> benchmarking of different fuzzers, e.g., building libraries with fuzzer
> >> instrumentation (afl-clang-fast…), running fuzzers, and triaging and
> >> analyzing fuzz-results with afl-cov. Our most recent paper is under
> review
> >> at USENIX Security 2021. I’ve also written a dozen LLVM passes following
> >> USCD’s advanced compiler course (Open-sourced code and notes at
> >> https://github.com/chibinz/CSE231) as practice and contributed to the
> >> basic block stubbing pass for coverage feedback in the prior research
> >> project. If applicable, I see this as a golden opportunity to exercise
> what
> >> I’ve learned about LLVM and fuzzing in real-world application and at
> LLVM
> >> scale. This also a chance for me, as an LLVM user, to contribute back to
> >> LLVM, following the FOSS spirit.
> >>
> >>        I wonder if this project is already occupied or still available?
> Are
> >> there any ‘good first issue’ that I can start working on or code of
> >> interest worth reading? I am aware the project description directs me to
> >> reach out to mentor Johannes Doerfert on IRC, but somehow trying to
> connect
> >> to the LLVM IRC channel using different clients always complains that
> the
> >> server refused the connection…(Sorry, but I’m not familiar with IRC,
> this
> >> is the first time trying…) Are there any other way to get in touch with
> the
> >> mentor? I feel really excited and hope to hear from you soon.
> >>
> >>
> >>
> >> Sincerely,
> >>
> >> Chibin Zhang
> >>
> >> 2021.3.1
> >> _______________________________________________
> >> LLVM Developers mailing list
> >> llvm-dev at lists.llvm.org
> >> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >>
> _______________________________________________
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