| # 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. |
| OPTLEVEL = "${@bb.utils.filter('SELECTED_OPTIMIZATION', '-O0 -O1 -O2 -O3 -Ofast -Og -Os -Oz -O', d)}" |
| |
| lcl_maybe_fortify ?= "${@oe.utils.conditional('OPTLEVEL','-O0','','${OPTLEVEL} -D_FORTIFY_SOURCE=2',d)}" |
| |
| # Error on use of format strings that represent possible security problems |
| SECURITY_STRINGFORMAT ?= "-Wformat -Wformat-security -Werror=format-security" |
| |
| # Inject pie flags into compiler flags if not configured with gcc itself |
| # especially useful with external toolchains |
| SECURITY_PIE_CFLAGS ?= "${@'' 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} ${SECURITY_STRINGFORMAT}" |
| |
| SECURITY_LDFLAGS ?= "-Wl,-z,relro,-z,now" |
| SECURITY_X_LDFLAGS ?= "-Wl,-z,relro" |
| |
| # powerpc does not get on with pie for reasons not looked into as yet |
| GCCPIE:powerpc = "" |
| GLIBCPIE:powerpc = "" |
| SECURITY_CFLAGS:remove:powerpc = "${SECURITY_PIE_CFLAGS}" |
| SECURITY_CFLAGS:pn-libgcc:powerpc = "" |
| |
| SECURITY_CFLAGS:pn-glibc = "" |
| SECURITY_CFLAGS:pn-glibc-testsuite = "" |
| SECURITY_CFLAGS:pn-gcc-runtime = "" |
| SECURITY_CFLAGS:pn-grub = "" |
| SECURITY_CFLAGS:pn-grub-efi = "" |
| 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}" |
| TARGET_CC_ARCH:append:class-cross-canadian = " ${SECURITY_CFLAGS}" |
| TARGET_LDFLAGS:append:class-cross-canadian = " ${SECURITY_LDFLAGS}" |
| |
| SECURITY_STACK_PROTECTOR:pn-gcc-runtime = "" |
| SECURITY_STACK_PROTECTOR:pn-glibc = "" |
| SECURITY_STACK_PROTECTOR:pn-glibc-testsuite = "" |
| # All xorg module drivers need to be linked this way as well and are |
| # handled in recipes-graphics/xorg-driver/xorg-driver-common.inc |
| SECURITY_LDFLAGS:pn-xserver-xorg = "${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}" |