cfl: support luzer-based tests

See also google/oss-fuzz#14656
See also google/oss-fuzz#14859
See also tarantool/tarantool#11250

Author: ligurio

.clusterfuzzlite/Dockerfile

@@ -14,3 +14,4 @@ COPY . $SRC/lunapark
 WORKDIR $SRC/lunapark
 RUN git clone --depth 1 --branch cfl https://github.com/ligurio/lunapark-corpus corpus
 COPY .clusterfuzzlite/build.sh $SRC/
+COPY .clusterfuzzlite/compile_lua_fuzzer $SRC/

.clusterfuzzlite/build.sh

@@ -29,6 +29,7 @@ esac
 cmake_args=(
     -DUSE_LUAJIT=ON
     -DOSS_FUZZ=ON
+    -DENABLE_LAPI_TESTS=ON
     $SANITIZERS_ARGS
 
     # C compiler
@@ -87,3 +88,55 @@ do
     zip -urj $OUT/"$name"_seed_corpus.zip "$options_path"
   fi
 done
+
+# Code coverage is not supported.
+if [[ "$SANITIZER" == "coverage" ]]; then
+  exit
+fi
+
+LUA_RUNTIME_NAME=luajit
+LUAJIT_PATH=build/luajit-v2.1/source/src/$LUA_RUNTIME_NAME
+LUA_MODULES_DIR=lua_modules
+
+apt install -y luarocks liblua5.1-0 liblua5.1-0-dev liblua5.1-0-dbg lua5.1
+
+# Required by luzer installed using luarocks.
+export OSS_FUZZ=1
+luarocks install --lua-version 5.1 --server=https://luarocks.org/dev --tree=$LUA_MODULES_DIR luzer
+unset OSS_FUZZ
+
+cp tests/lapi/lib.lua $OUT
+
+LUZER_TESTS_DIR="tests/lapi/"
+# Generating test wrappers for luzer-based tests.
+for test_path in $(find $LUZER_TESTS_DIR -name "*_test.lua" -type f);
+do
+  test_file=$(basename $test_path);
+  test_name_we="${test_file%.*}";
+  # The following tests made for the functions that unsupported by
+  # LuaJIT.
+  if [[ $test_name_we == "math_tointeger_test" ||
+        $test_name_we == "math_ult_test" ||
+        $test_name_we == "string_pack_test" ||
+        $test_name_we == "string_packsize_test" ||
+        $test_name_we == "string_unpack_test" ||
+        $test_name_we == "table_pack_test" ||
+        $test_name_we == "utf8_char_test" ||
+        $test_name_we == "utf8_codepoint_test" ||
+        $test_name_we == "utf8_codes_test" ||
+        $test_name_we == "utf8_len_test" ||
+        $test_name_we == "utf8_offset_test" ]]; then
+    continue
+  fi
+  module_name=$(echo $test_name_we | sed 's/_test//' )
+  "$SRC/compile_lua_fuzzer" "$LUA_RUNTIME_NAME" $test_file
+  cp "$test_path" "$OUT/"
+  corpus_dir="corpus/corpus/$test_name_we"
+  if [ -e "$corpus_dir" ]; then
+    zip -j $OUT/"$test_name_we"_seed_corpus.zip $corpus_dir/*
+    echo "Build corpus '$OUT/"$test_name_we"_seed_corpus.zip' for the test '$test_name_we'"
+  fi
+done
+
+cp $LUAJIT_PATH "$OUT/$LUA_RUNTIME_NAME"
+cp -R $LUA_MODULES_DIR "$OUT/"

.clusterfuzzlite/compile_lua_fuzzer

@@ -0,0 +1,39 @@
+#!/bin/bash -eu
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+# The Lua runtime name.
+lua_runtime=$1
+# Path to the fuzz target source file relative to the project's root.
+fuzz_target=$2
+
+fuzzer_basename=$(basename -s .lua "$fuzz_target")
+
+# Create an execution wrapper that executes luzer with the correct
+# arguments.
+echo "#!/bin/bash
+
+set -eu
+
+# LLVMFuzzerTestOneInput so that the wrapper script is recognized
+# as a fuzz target for 'check_build'.
+project_dir=\$(dirname \$(realpath \"\$0\"))
+eval \$(luarocks --lua-version 5.1 --tree \$project_dir/lua_modules path)
+export LUA_PATH=\"\$project_dir/?.lua;\$LUA_PATH\"
+ASAN_OPTIONS=\$ASAN_OPTIONS:symbolize=1:external_symbolizer_path=\$project_dir/llvm-symbolizer:detect_leaks=0 \
+\$project_dir/$lua_runtime \$project_dir/$fuzz_target \$@" > "$OUT/$fuzzer_basename"
+
+chmod +x "$OUT/$fuzzer_basename"