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I have the following Lua versions installed on my machine:
tree /usr/include/lua*
/usr/include/lua5.1
├── lauxlib.h
├── luaconf.h
├── lua.h
├── lua.hpp
└── lualib.h
/usr/include/lua5.4
├── lauxlib.h
├── luaconf.h
├── lua.h
├── lua.hpp
└── lualib.h
/usr/include/luajit-2.1
├── lauxlib.h
├── luaconf.h
├── lua.h
├── lua.hpp
├── luajit.h
└── lualib.h
ls /usr/lib64/ | grep lua
liblua5.1.so
liblua5.1.so.0
liblua5.1.so.0.0.0
liblua5.4.so
liblua5.4.so.0
liblua5.4.so.0.0.0
libluajit-5.1.so
libluajit-5.1.so.2
libluajit-5.1.so.2.1.1716656478The mixed part is the custom mutator library, which uses lua_objlen() which is renamed to the lua_rawlen() since Lua 5.2.
As I noticed, when I build luzer like the following:
cmake -S . -B build -DENABLE_TESTING=ON -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
It finds the Lua header for the 5.1 version but links with the version 5.4.
As a result, the custom mutator library can't be preloaded:
LD_PRELOAD="/home/burii/reviews/ligurio-luzer/ligurio-luzer/build/luzer/libcustom_mutator.so.1" ls
ls: symbol lookup error: /home/burii/reviews/ligurio-luzer/ligurio-luzer/build/luzer/libcustom_mutator.so.1: undefined symbol: lua_objlen
It results in the following test failures when run by Lua 5.4 binary:
$ ctest -V --test-dir build -R luzer_custom_mutator_example
...
7: /usr/bin/lua5.4: ...burii/reviews/ligurio-luzer/ligurio-luzer/luzer/init.lua:48: function LLVMFuzzerCustomMutator is not available
7: stack traceback:
7: [C]: in function 'luzer_impl.Fuzz'
7: ...burii/reviews/ligurio-luzer/ligurio-luzer/luzer/init.lua:48: in function 'luzer.Fuzz'
7: ...-luzer/ligurio-luzer/examples/example_custom_mutator.lua:29: in main chunk
7: [C]: in ?
1/1 Test #7: luzer_custom_mutator_example .....***Failed Required regular expression not found. Regex=[
50B5
example_custom_mutator.lua:19: assert has triggered
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