| # Setup extra CFLAGS and LDFLAGS which have 'security' benefits. These |
| # don't work universally, there are recipes which can't use one, the other |
| # or both so a blacklist is maintained here. The idea would be over |
| # time to reduce this list to nothing. |
| # From a Yocto Project perspective, this file is included and tested |
| # in the DISTRO="poky" configuration. |
| |
| GCCPIE ?= "--enable-default-pie" |
| # If static PIE is known to work well, GLIBCPIE="--enable-static-pie" can be set |
| |
| # _FORTIFY_SOURCE requires -O1 or higher, so disable in debug builds as they use |
| # -O0 which then results in a compiler warning. |
| lcl_maybe_fortify ?= "${@oe.utils.conditional('DEBUG_BUILD','1','','-D_FORTIFY_SOURCE=2',d)}" |
| |
| # Error on use of format strings that represent possible security problems |
| SECURITY_STRINGFORMAT ?= "-Wformat -Wformat-security -Werror=format-security" |
| |
| # Inject pie flags into compiler flags if not configured with gcc itself |
| # especially useful with external toolchains |
| SECURITY_PIE_CFLAGS ?= "${@'' if '${GCCPIE}' else '-pie -fPIE'}" |
| |
| SECURITY_NOPIE_CFLAGS ?= "-no-pie -fno-PIE" |
| |
| SECURITY_STACK_PROTECTOR ?= "-fstack-protector-strong" |
| |
| SECURITY_CFLAGS ?= "${SECURITY_STACK_PROTECTOR} ${SECURITY_PIE_CFLAGS} ${lcl_maybe_fortify} ${SECURITY_STRINGFORMAT}" |
| SECURITY_NO_PIE_CFLAGS ?= "${SECURITY_STACK_PROTECTOR} ${lcl_maybe_fortify} ${SECURITY_STRINGFORMAT}" |
| |
| SECURITY_LDFLAGS ?= "${SECURITY_STACK_PROTECTOR} -Wl,-z,relro,-z,now" |
| SECURITY_X_LDFLAGS ?= "${SECURITY_STACK_PROTECTOR} -Wl,-z,relro" |
| |
| # powerpc does not get on with pie for reasons not looked into as yet |
| GCCPIE_powerpc = "" |
| GLIBCPIE_powerpc = "" |
| SECURITY_CFLAGS_remove_powerpc = "${SECURITY_PIE_CFLAGS}" |
| SECURITY_CFLAGS_pn-libgcc_powerpc = "" |
| |
| SECURITY_CFLAGS_pn-glibc = "" |
| SECURITY_CFLAGS_pn-glibc-initial = "" |
| SECURITY_CFLAGS_pn-gcc-runtime = "" |
| SECURITY_CFLAGS_pn-grub = "" |
| SECURITY_CFLAGS_pn-grub-efi = "" |
| SECURITY_CFLAGS_pn-grub-efi-native = "" |
| SECURITY_CFLAGS_pn-grub-efi-x86-native = "" |
| SECURITY_CFLAGS_pn-grub-efi-i586-native = "" |
| SECURITY_CFLAGS_pn-grub-efi-x86-64-native = "" |
| SECURITY_CFLAGS_pn-mkelfimage_x86 = "" |
| |
| SECURITY_CFLAGS_pn-valgrind = "${SECURITY_NOPIE_CFLAGS}" |
| SECURITY_LDFLAGS_pn-valgrind = "" |
| SECURITY_CFLAGS_pn-sysklogd = "${SECURITY_NOPIE_CFLAGS}" |
| SECURITY_LDFLAGS_pn-sysklogd = "" |
| |
| # Recipes which fail to compile when elevating -Wformat-security to an error |
| SECURITY_STRINGFORMAT_pn-busybox = "" |
| SECURITY_STRINGFORMAT_pn-gcc = "" |
| |
| TARGET_CC_ARCH_append_class-target = " ${SECURITY_CFLAGS}" |
| TARGET_LDFLAGS_append_class-target = " ${SECURITY_LDFLAGS}" |
| |
| SECURITY_STACK_PROTECTOR_pn-gcc-runtime = "" |
| SECURITY_STACK_PROTECTOR_pn-glibc = "" |
| SECURITY_STACK_PROTECTOR_pn-glibc-initial = "" |
| # All xorg module drivers need to be linked this way as well and are |
| # handled in recipes-graphics/xorg-driver/xorg-driver-common.inc |
| SECURITY_LDFLAGS_pn-xserver-xorg = "${SECURITY_X_LDFLAGS}" |
| |
| TARGET_CC_ARCH_append_pn-binutils = " ${SELECTED_OPTIMIZATION}" |
| TARGET_CC_ARCH_append_pn-gcc = " ${SELECTED_OPTIMIZATION}" |
| TARGET_CC_ARCH_append_pn-gdb = " ${SELECTED_OPTIMIZATION}" |
| TARGET_CC_ARCH_append_pn-perf = " ${SELECTED_OPTIMIZATION}" |