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Update libfuzzer to LLVM 18 #2035

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Update libfuzzer to LLVM 18 #2035

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a3c0f1f
update libfuzzer to sane version
addisoncrump Aug 19, 2024
652394b
use the correct std version
addisoncrump Aug 19, 2024
e3253ce
purge llvm better, remove old patch, ignore container overflow
addisoncrump Aug 19, 2024
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15 changes: 12 additions & 3 deletions fuzzers/libfuzzer/builder.Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,21 @@
ARG parent_image
FROM $parent_image

# Install dependencies.
RUN apt-get update && \
apt-get remove -y llvm-* clang-* && \
apt-get install -y \
build-essential \
lsb-release wget software-properties-common gnupg && \
wget https://apt.llvm.org/llvm.sh && chmod +x llvm.sh && ./llvm.sh 18
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@tokatoka tokatoka Aug 19, 2024 •
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this will install binaries into /usr/bin but won't make /usr/bin/clang point to /usr/bin/clang-18

so if you run clang after the install, then the older one, if it exists, will still be used
to fix this you need something like this https://gist.github.com/tokatoka/26f4ba95991c6e33139999976332aa8e or use update-alternative (since this is ubuntu


RUN git clone https://github.com/llvm/llvm-project.git /llvm-project && \
cd /llvm-project && \
git checkout 5cda4dc7b4d28fcd11307d4234c513ff779a1c6f && \
cd compiler-rt/lib/fuzzer && \
git checkout 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff

RUN cd /llvm-project/compiler-rt/lib/fuzzer && \
(for f in *.cpp; do \
clang++ -stdlib=libc++ -fPIC -O2 -std=c++11 $f -c & \
clang++ -stdlib=libc++ -fPIC -O2 -std=c++17 $f -c & \
done && wait) && \
ar r libFuzzer.a *.o && \
cp libFuzzer.a /usr/lib
5 changes: 5 additions & 0 deletions fuzzers/libfuzzer/fuzzer.py
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Expand Up @@ -53,6 +53,11 @@ def run_fuzzer(input_corpus, output_corpus, target_binary, extra_flags=None):
os.makedirs(crashes_dir)
os.makedirs(output_corpus)

if 'ASAN_OPTIONS' in os.environ:
os.environ['ASAN_OPTIONS'] += ':detect_container_overflow=0'
else:
os.environ['ASAN_OPTIONS'] = 'detect_container_overflow=0'

# Enable symbolization if needed.
# Note: if the flags are like `symbolize=0:..:symbolize=1` then
# only symbolize=1 is respected.
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100 changes: 0 additions & 100 deletions fuzzers/libfuzzer/patch.diff
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