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# Copyright (c) 2017, 2025, Oracle and/or its affiliates.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2.0,
# as published by the Free Software Foundation.
#
# This program is designed to work with certain software (including
# but not limited to OpenSSL) that is licensed under separate terms,
# as designated in a particular file or component or in included license
# documentation. The authors of MySQL hereby grant you an additional
# permission to link the program and your derivative works with the
# separately licensed software that they have either included with
# the program or referenced in the documentation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
INCLUDE(CMakePushCheckState)
# Only supported for Clang/llvm
IF(NOT MY_COMPILER_IS_CLANG)
RETURN()
ENDIF()
# ld.lld: error:
# /usr/lib64/clang/7.0.1/lib/linux/libclang_rt.fuzzer-x86_64.a
# (FuzzerLoop.cpp.o): unsupported SHT_GROUP format
IF(USING_LD_LLD)
FOREACH(flag
CMAKE_EXE_LINKER_FLAGS
CMAKE_MODULE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS
)
STRING(REPLACE "-fuse-ld=lld" "" ${flag} "${${flag}}")
STRING(REPLACE "-Wl,--gdb-index" "" ${flag} "${${flag}}")
ENDFOREACH()
ENDIF()
# check if clang knows about the coverage and trace-pc-guard
#
# compiler | CFLAGS | LDFLAGS
# ----------|------------------------------------|------------------
# llvm 6.0+ | -fsanitize=fuzzer | -fsanitize=fuzzer
# llvm 4.0 | -fsanitize-coverage=trace-pc-guard | -lFuzzer
# llvm 3.9 | -fsanitize-coverage=trace-cmp | -lFuzzer
# llvm 3.7 | -fsanitize-coverage=edge | -lFuzzer
# llvm 4.0+
CMAKE_PUSH_CHECK_STATE(RESET)
SET(CMAKE_REQUIRED_FLAGS "-fsanitize-coverage=trace-pc-guard")
CHECK_CXX_COMPILER_FLAG("-fsanitize-coverage=trace-pc-guard"
COMPILER_HAS_SANITIZE_COVERAGE_TRACE_PC_GUARD)
CMAKE_POP_CHECK_STATE()
# llvm 3.8+
CMAKE_PUSH_CHECK_STATE(RESET)
SET(CMAKE_REQUIRED_FLAGS "-fsanitize-coverage=edge")
CHECK_CXX_COMPILER_FLAG("-fsanitize-coverage=edge"
COMPILER_HAS_SANITIZE_COVERAGE_TRACE_EDGE)
CMAKE_POP_CHECK_STATE()
# http://llvm.org/docs/LibFuzzer.html#tracing-cmp-instructions
CMAKE_PUSH_CHECK_STATE(RESET)
SET(CMAKE_REQUIRED_FLAGS "-fsanitize-coverage=trace-cmp")
CHECK_CXX_COMPILER_FLAG("-fsanitize-coverage=trace-cmp"
COMPILER_HAS_SANITIZE_COVERAGE_TRACE_CMP)
CMAKE_POP_CHECK_STATE()
CMAKE_PUSH_CHECK_STATE(RESET)
CHECK_CXX_COMPILER_FLAG("-fprofile-instr-generate"
COMPILER_HAS_PROFILE_INSTR_GENERATE)
CMAKE_POP_CHECK_STATE()
CMAKE_PUSH_CHECK_STATE(RESET)
# invalid argument '-fcoverage-mapping' only allowed
# with '-fprofile-instr-generate'
SET(CMAKE_REQUIRED_FLAGS "-fprofile-instr-generate")
CHECK_CXX_COMPILER_FLAG("-fcoverage-mapping" COMPILER_HAS_COVERAGE_MAPPING)
CMAKE_POP_CHECK_STATE()
CMAKE_PUSH_CHECK_STATE(RESET)
SET(CMAKE_REQUIRED_LIBRARIES "-fsanitize=fuzzer")
SET(CMAKE_REQUIRED_FLAGS "-fsanitize=fuzzer")
CHECK_CXX_SOURCE_COMPILES("
extern \"C\" int LLVMFuzzerTestOneInput (void *, int)
{ return 0; }"
COMPILER_HAS_SANITIZE_FUZZER)
CMAKE_POP_CHECK_STATE()
IF(COMPILER_HAS_SANITIZE_FUZZER)
SET(SANITIZE_COVERAGE_FLAGS "-fsanitize=fuzzer")
ELSEIF(COMPILER_HAS_SANITIZE_COVERAGE_TRACE_PC_GUARD)
SET(SANITIZE_COVERAGE_FLAGS "-fsanitize-coverage=trace-pc-guard")
ELSEIF(COMPILER_HAS_SANITIZE_COVERAGE_TRACE_EDGE)
SET(SANITIZE_COVERAGE_FLAGS "-fsanitize-coverage=edge")
ENDIF()
# check that libFuzzer is found
#
# check_library_exists() doesn't work here as it would provide a main() which
# calls a test-function ... which collides with libFuzzer's main():
#
# if the libFuzzer is found by the compiler it will provide a 'main()' and
# require that we provide a 'LLVMFuzzerTestOneInput' at link-time.
IF(SANITIZE_COVERAGE_FLAGS)
CMAKE_PUSH_CHECK_STATE(RESET)
SET(CMAKE_REQUIRED_LIBRARIES Fuzzer)
SET(CMAKE_REQUIRED_FLAGS ${SANITIZE_COVERAGE_FLAGS})
CHECK_CXX_SOURCE_COMPILES("
extern \"C\" int LLVMFuzzerTestOneInput (void *, int)
{ return 0; }"
CLANG_HAS_LIBFUZZER)
CMAKE_POP_CHECK_STATE()
ENDIF()
IF(COMPILER_HAS_SANITIZE_FUZZER OR CLANG_HAS_LIBFUZZER)
IF(CLANG_HAS_LIBFUZZER)
SET(LIBFUZZER_LIBRARIES Fuzzer)
ENDIF()
SET(LIBFUZZER_LINK_FLAGS ${SANITIZE_COVERAGE_FLAGS})
SET(LIBFUZZER_COMPILE_FLAGS)
LIST(APPEND LIBFUZZER_COMPILE_FLAGS ${SANITIZE_COVERAGE_FLAGS})
IF(COMPILER_HAS_PROFILE_INSTR_GENERATE)
LIST(APPEND LIBFUZZER_COMPILE_FLAGS -fprofile-instr-generate)
SET(LIBFUZZER_LINK_FLAGS
"${LIBFUZZER_LINK_FLAGS} -fprofile-instr-generate")
LIST(APPEND LIBFUZZER_COMPILE_FLAGS -fcoverage-mapping)
ENDIF()
ENDIF()
FUNCTION(LIBFUZZER_ADD_TEST TARGET)
SET(OPTS)
SET(ONE_VAL_ARGS INITIAL_CORPUS_DIR MAX_TOTAL_TIME TIMEOUT)
SET(MULTI_VAL_ARGS)
CMAKE_PARSE_ARGUMENTS(ARG "${OPTS}" "${ONE_VAL_ARGS}" "${MULTI_VAL_ARGS}" ${ARGN})
IF(NOT DEFINED ARG_MAX_TOTAL_TIME)
SET(ARG_MAX_TOTAL_TIME 10)
ENDIF()
IF(NOT DEFINED ARG_TIMEOUT)
SET(ARG_TIMEOUT 0.1)
ENDIF()
SET(BINARY_CORPUS_DIR "${CMAKE_CURRENT_BINARY_DIR}/corpus/${TARGET}")
SET(BINARY_ARTIFACT_DIR "${CMAKE_CURRENT_BINARY_DIR}/artifacts/${TARGET}")
SET_TARGET_PROPERTIES(
${TARGET}
PROPERTIES
COMPILE_OPTIONS "${LIBFUZZER_COMPILE_FLAGS}"
LINK_FLAGS "${LIBFUZZER_LINK_FLAGS}"
)
IF(LIBFUZZER_LIBRARIES)
TARGET_LINK_LIBRARIES(${TARGET} ${LIBFUZZER_LIBRARIES})
ENDIF()
# reset the artifact and corpus dir if the binary changed.
ADD_CUSTOM_COMMAND(TARGET ${TARGET}
POST_BUILD
COMMAND ${CMAKE_COMMAND} -E remove_directory "${BINARY_CORPUS_DIR}"
COMMAND ${CMAKE_COMMAND} -E make_directory "${BINARY_CORPUS_DIR}"
COMMAND ${CMAKE_COMMAND} -E remove_directory "${BINARY_ARTIFACT_DIR}"
COMMAND ${CMAKE_COMMAND} -E make_directory "${BINARY_ARTIFACT_DIR}"
)
IF(ARG_INITIAL_CORPUS_DIR)
# prepare the corpus in the build-dir based on samples from the source-dir
ADD_CUSTOM_COMMAND(TARGET ${TARGET}
POST_BUILD
COMMAND $<TARGET_FILE:${TARGET}>
-merge=1
-verbosity=0
-merge_control_file="${CMAKE_CURRENT_BINARY_DIR}/${TARGET}.control"
"${ARG_INITIAL_CORPUS_DIR}" "${BINARY_CORPUS_DIR}" 2> /dev/null
COMMENT "Preparing corpus for ${TARGET}"
)
ENDIF()
ADD_TEST(NAME ${TARGET}
COMMAND ${TARGET}
-max_total_time=${ARG_MAX_TOTAL_TIME} -timeout=${ARG_TIMEOUT}
-artifact_prefix=${BINARY_ARTIFACT_DIR}/
${BINARY_CORPUS_DIR}
)
ENDFUNCTION()
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