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To allow for easy mapping between the kernel virtual addresses and KASAN shadow memory, we map shadow memory at the very end of the virtual range, so that we can index into it using just an offset. To ensure this range is free when needed, we restrict the possible KASLR range when KASAN is enabled to make sure we don't use the end of the virtual range. This fixes the random kernel panics that could occur when KASAN is enabled, if the kernel was randomly placed at the very end of the virtual range.
47 lines
1.9 KiB
CMake
47 lines
1.9 KiB
CMake
set(SOURCES
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UBSanitizer.cpp
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../Library/MiniStdLib.cpp
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boot.S
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multiboot.S
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init.cpp
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../../Userland/Libraries/LibELF/Relocation.cpp
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)
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if ("${SERENITY_ARCH}" STREQUAL "x86_64")
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set(PREKERNEL_TARGET Prekernel64)
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elseif("${SERENITY_ARCH}" STREQUAL "aarch64")
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message(SEND_ERROR "Prekernel is not needed on aarch64 and should not be compiled!")
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endif()
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static")
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add_executable(${PREKERNEL_TARGET} ${SOURCES})
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add_dependencies(${PREKERNEL_TARGET} install_libc_headers)
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target_compile_options(${PREKERNEL_TARGET} PRIVATE -no-pie -fno-pic -fno-threadsafe-statics)
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target_link_options(${PREKERNEL_TARGET} PRIVATE LINKER:-T ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld -nostdlib LINKER:--no-pie)
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set_target_properties(${PREKERNEL_TARGET} PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
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if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
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target_link_libraries(${PREKERNEL_TARGET} PRIVATE gcc)
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elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang$")
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target_link_libraries(${PREKERNEL_TARGET} PRIVATE clang_rt.builtins)
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endif()
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add_custom_command(
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TARGET ${PREKERNEL_TARGET} POST_BUILD
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COMMAND ${CMAKE_OBJCOPY} -O elf32-i386 ${CMAKE_CURRENT_BINARY_DIR}/${PREKERNEL_TARGET} ${CMAKE_CURRENT_BINARY_DIR}/Prekernel
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BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/Prekernel
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)
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install(FILES "${CMAKE_CURRENT_BINARY_DIR}/Prekernel" DESTINATION boot)
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# Remove options which the Prekernel environment doesn't support.
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get_target_property(PREKERNEL_TARGET_OPTIONS ${PREKERNEL_TARGET} COMPILE_OPTIONS)
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list(REMOVE_ITEM PREKERNEL_TARGET_OPTIONS "-fsanitize-coverage=trace-pc")
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list(REMOVE_ITEM PREKERNEL_TARGET_OPTIONS "-fsanitize=kernel-address")
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set_target_properties(${PREKERNEL_TARGET} PROPERTIES COMPILE_OPTIONS "${PREKERNEL_TARGET_OPTIONS}")
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if (ENABLE_KERNEL_ADDRESS_SANITIZER)
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add_compile_definitions(KERNEL_ADDRESS_SANITIZER_ENABLED)
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endif()
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