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american fuzzy lop - a security-oriented fuzzer
https://lcamtuf.coredump.cx/afl/
Apache License 2.0
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cannot build llvm_mode under clang10 undefined symbol: _ZNK4llvm10ModulePass17createPrinterPassERNS_11raw_ostreamERKNSt3__112basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEE' #62

Closed zjuchenyuan closed 4 years ago

zjuchenyuan commented 4 years ago 
# clang -v
clang version 10.0.0 (https://github.com/llvm/llvm-project.git e84b7a5fe230e42b8e6fe451369874a773bf1867)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

# cd /AFL/llvm_mode
# make
[*] Checking for working 'llvm-config'...
[*] Checking for working 'clang'...
[*] Checking for '../afl-showmap'...
[+] All set and ready to build.
clang -O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DBIN_PATH=\"/usr/local/bin\" -DVERSION=\"2.56b\"  afl-clang-fast.c -o ../afl-clang-fast
ln -sf afl-clang-fast ../afl-clang-fast++
clang++ `llvm-config --cxxflags` -Wl,-znodelete -fno-rtti -fpic -O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -stdlib=libc++ -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DVERSION=\"2.56b\" -Wno-variadic-macros -shared afl-llvm-pass.so.cc -o ../afl-llvm-pass.so `llvm-config --ldflags`
clang -O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DBIN_PATH=\"/usr/local/bin\" -DVERSION=\"2.56b\"  -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt.o
[*] Building 32-bit variant of the runtime (-m32)... success!
[*] Building 64-bit variant of the runtime (-m64)... success!
[*] Testing the CC wrapper and instrumentation output...
unset AFL_USE_ASAN AFL_USE_MSAN AFL_INST_RATIO; AFL_QUIET=1 AFL_PATH=. AFL_CC=clang ../afl-clang-fast -O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DBIN_PATH=\"/usr/local/bin\" -DVERSION=\"2.56b\"  ../test-instr.c -o test-instr
error: unable to load plugin '../afl-llvm-pass.so': '../afl-llvm-pass.so: undefined symbol: _ZNK4llvm10ModulePass17createPrinterPassERNS_11raw_ostreamERKNSt3__112basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEE'
Makefile:98: recipe for target 'test_build' failed
make: *** [test_build] Error 1

which after cxxfilt: llvm::ModulePass::createPrinterPass(llvm::raw_ostream&, std::1::basic_string<char, std::__1::char_traits, std::1::allocator > const&) const

but I cannot find any reference to createPrinterPass in afl source code.

zjuchenyuan commented 4 years ago

It seems it's an issue about the environment

I'm using oss-fuzz image, so some environment variables are set.

CFLAGS=-O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
CXXFLAGS=-O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -stdlib=libc++

after unset CFLAGS CXXFLAGS CC CXX, it works now.