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build: Drop option for disabling hardening
Building unhardened executables is not a supported use case that should be maintained and those that want unhardened executables can still override them by appending disable flags. For example: cmake -B build -DAPPEND_CPPFLAGS='-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 -fno-stack-protector -fcf-protection=none -fno-stack-clash-protection' -DAPPEND_LDFLAGS='-Wl,-z,lazy -Wl,-z,norelro -Wl,-z,noseparate-code'
This commit is contained in:
David Gumberg
parent
f57db75e91
commit
00ba3ba303
2 changed files with 59 additions and 64 deletions
122
CMakeLists.txt
122
CMakeLists.txt
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@ -128,7 +128,6 @@ if(WITH_BDB)
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endif()
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cmake_dependent_option(BUILD_WALLET_TOOL "Build bitcoin-wallet tool." ${BUILD_TESTS} "ENABLE_WALLET" OFF)
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option(ENABLE_HARDENING "Attempt to harden the resulting executables." ON)
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option(REDUCE_EXPORTS "Attempt to reduce exported symbols in the resulting executables." OFF)
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option(WERROR "Treat compiler warnings as errors." OFF)
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option(WITH_CCACHE "Attempt to use ccache for compiling." ON)
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@ -481,75 +480,73 @@ try_append_cxx_flags("-fmacro-prefix-map=A=B" TARGET core_interface SKIP_LINK
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# -fstack-reuse=none for all gcc builds. (Only gcc understands this flag).
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try_append_cxx_flags("-fstack-reuse=none" TARGET core_interface)
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if(ENABLE_HARDENING)
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add_library(hardening_interface INTERFACE)
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target_link_libraries(core_interface INTERFACE hardening_interface)
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if(MSVC)
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try_append_linker_flag("/DYNAMICBASE" TARGET hardening_interface)
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try_append_linker_flag("/HIGHENTROPYVA" TARGET hardening_interface)
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try_append_linker_flag("/NXCOMPAT" TARGET hardening_interface)
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else()
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add_library(hardening_interface INTERFACE)
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target_link_libraries(core_interface INTERFACE hardening_interface)
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if(MSVC)
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try_append_linker_flag("/DYNAMICBASE" TARGET hardening_interface)
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try_append_linker_flag("/HIGHENTROPYVA" TARGET hardening_interface)
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try_append_linker_flag("/NXCOMPAT" TARGET hardening_interface)
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else()
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# _FORTIFY_SOURCE requires that there is some level of optimization,
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# otherwise it does nothing and just creates a compiler warning.
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try_append_cxx_flags("-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3"
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RESULT_VAR cxx_supports_fortify_source
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SOURCE "int main() {
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# if !defined __OPTIMIZE__ || __OPTIMIZE__ <= 0
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#error
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#endif
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}"
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# _FORTIFY_SOURCE requires that there is some level of optimization,
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# otherwise it does nothing and just creates a compiler warning.
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try_append_cxx_flags("-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3"
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RESULT_VAR cxx_supports_fortify_source
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SOURCE "int main() {
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# if !defined __OPTIMIZE__ || __OPTIMIZE__ <= 0
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#error
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#endif
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}"
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)
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if(cxx_supports_fortify_source)
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target_compile_options(hardening_interface INTERFACE
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-U_FORTIFY_SOURCE
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-D_FORTIFY_SOURCE=3
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)
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if(cxx_supports_fortify_source)
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target_compile_options(hardening_interface INTERFACE
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-U_FORTIFY_SOURCE
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-D_FORTIFY_SOURCE=3
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)
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endif()
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unset(cxx_supports_fortify_source)
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endif()
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unset(cxx_supports_fortify_source)
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try_append_cxx_flags("-Wstack-protector" TARGET hardening_interface SKIP_LINK)
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try_append_cxx_flags("-fstack-protector-all" TARGET hardening_interface)
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try_append_cxx_flags("-fcf-protection=full" TARGET hardening_interface)
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try_append_cxx_flags("-Wstack-protector" TARGET hardening_interface SKIP_LINK)
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try_append_cxx_flags("-fstack-protector-all" TARGET hardening_interface)
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try_append_cxx_flags("-fcf-protection=full" TARGET hardening_interface)
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if(MINGW)
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# stack-clash-protection is a no-op for Windows.
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# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90458 for more details.
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else()
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try_append_cxx_flags("-fstack-clash-protection" TARGET hardening_interface)
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endif()
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if(MINGW)
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# stack-clash-protection is a no-op for Windows.
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# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90458 for more details.
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else()
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try_append_cxx_flags("-fstack-clash-protection" TARGET hardening_interface)
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endif()
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if(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64")
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if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
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try_append_cxx_flags("-mbranch-protection=bti" TARGET hardening_interface SKIP_LINK)
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else()
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try_append_cxx_flags("-mbranch-protection=standard" TARGET hardening_interface SKIP_LINK)
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endif()
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endif()
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try_append_linker_flag("-Wl,--enable-reloc-section" TARGET hardening_interface)
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try_append_linker_flag("-Wl,--dynamicbase" TARGET hardening_interface)
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try_append_linker_flag("-Wl,--nxcompat" TARGET hardening_interface)
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try_append_linker_flag("-Wl,--high-entropy-va" TARGET hardening_interface)
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try_append_linker_flag("-Wl,-z,relro" TARGET hardening_interface)
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try_append_linker_flag("-Wl,-z,now" TARGET hardening_interface)
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# TODO: This can be dropped once Bitcoin Core no longer supports
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# NetBSD 10.0 or if upstream fix is backported.
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# NetBSD's dynamic linker ld.elf_so < 11.0 supports exactly 2
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# `PT_LOAD` segments and binaries linked with `-z separate-code`
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# have 4 `PT_LOAD` segments.
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# Relevant discussions:
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# - https://github.com/bitcoin/bitcoin/pull/28724#issuecomment-2589347934
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# - https://mail-index.netbsd.org/tech-userlevel/2023/01/05/msg013666.html
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if(CMAKE_SYSTEM_NAME STREQUAL "NetBSD" AND CMAKE_SYSTEM_VERSION VERSION_LESS 11.0)
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try_append_linker_flag("-Wl,-z,noseparate-code" TARGET hardening_interface)
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else()
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try_append_linker_flag("-Wl,-z,separate-code" TARGET hardening_interface)
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endif()
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if(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64")
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if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
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try_append_linker_flag("-Wl,-fixup_chains" TARGET hardening_interface)
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try_append_cxx_flags("-mbranch-protection=bti" TARGET hardening_interface SKIP_LINK)
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else()
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try_append_cxx_flags("-mbranch-protection=standard" TARGET hardening_interface SKIP_LINK)
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endif()
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endif()
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try_append_linker_flag("-Wl,--enable-reloc-section" TARGET hardening_interface)
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try_append_linker_flag("-Wl,--dynamicbase" TARGET hardening_interface)
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try_append_linker_flag("-Wl,--nxcompat" TARGET hardening_interface)
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try_append_linker_flag("-Wl,--high-entropy-va" TARGET hardening_interface)
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try_append_linker_flag("-Wl,-z,relro" TARGET hardening_interface)
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try_append_linker_flag("-Wl,-z,now" TARGET hardening_interface)
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# TODO: This can be dropped once Bitcoin Core no longer supports
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# NetBSD 10.0 or if upstream fix is backported.
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# NetBSD's dynamic linker ld.elf_so < 11.0 supports exactly 2
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# `PT_LOAD` segments and binaries linked with `-z separate-code`
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# have 4 `PT_LOAD` segments.
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# Relevant discussions:
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# - https://github.com/bitcoin/bitcoin/pull/28724#issuecomment-2589347934
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# - https://mail-index.netbsd.org/tech-userlevel/2023/01/05/msg013666.html
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if(CMAKE_SYSTEM_NAME STREQUAL "NetBSD" AND CMAKE_SYSTEM_VERSION VERSION_LESS 11.0)
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try_append_linker_flag("-Wl,-z,noseparate-code" TARGET hardening_interface)
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else()
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try_append_linker_flag("-Wl,-z,separate-code" TARGET hardening_interface)
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endif()
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if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
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try_append_linker_flag("-Wl,-fixup_chains" TARGET hardening_interface)
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endif()
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endif()
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if(REDUCE_EXPORTS)
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@ -684,7 +681,6 @@ message("Cross compiling ....................... ${cross_status}")
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message("C++ compiler .......................... ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}, ${CMAKE_CXX_COMPILER}")
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include(FlagsSummary)
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flags_summary()
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message("Attempt to harden executables ......... ${ENABLE_HARDENING}")
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message("Treat compiler warnings as errors ..... ${WERROR}")
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message("Use ccache for compiling .............. ${WITH_CCACHE}")
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message("\n")
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@ -77,7 +77,6 @@
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"BUILD_UTIL_CHAINSTATE": "ON",
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"BUILD_WALLET_TOOL": "ON",
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"ENABLE_EXTERNAL_SIGNER": "ON",
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"ENABLE_HARDENING": "ON",
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"ENABLE_WALLET": "ON",
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"WARN_INCOMPATIBLE_BDB": "OFF",
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"WITH_BDB": "ON",
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