diff options
Diffstat (limited to 'poky/meta/conf/distro/include/security_flags.inc')
-rw-r--r-- | poky/meta/conf/distro/include/security_flags.inc | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/poky/meta/conf/distro/include/security_flags.inc b/poky/meta/conf/distro/include/security_flags.inc new file mode 100644 index 000000000..d66dd5764 --- /dev/null +++ b/poky/meta/conf/distro/include/security_flags.inc @@ -0,0 +1,71 @@ +# 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-lsb" configuration. + +GCCPIE ?= "--enable-default-pie" +GLIBCPIE ?= "--enable-static-pie" + +# _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_CFLAGS ?= "-fstack-protector-strong ${SECURITY_PIE_CFLAGS} ${lcl_maybe_fortify} ${SECURITY_STRINGFORMAT}" +SECURITY_NO_PIE_CFLAGS ?= "-fstack-protector-strong ${lcl_maybe_fortify} ${SECURITY_STRINGFORMAT}" + +SECURITY_LDFLAGS ?= "-fstack-protector-strong -Wl,-z,relro,-z,now" +SECURITY_X_LDFLAGS ?= "-fstack-protector-strong -Wl,-z,relro" + +# powerpc does not get on with pie for reasons not looked into as yet +SECURITY_CFLAGS_powerpc = "-fstack-protector-strong ${lcl_maybe_fortify} ${SECURITY_NOPIE_CFLAGS}" +SECURITY_CFLAGS_pn-libgcc_powerpc = "" +GCCPIE_powerpc = "" +GLIBCPIE_powerpc = "" + +# arm specific security flag issues +SECURITY_CFLAGS_pn-glibc = "" +SECURITY_CFLAGS_pn-glibc-initial = "" +SECURITY_CFLAGS_pn-gcc-runtime = "" +SECURITY_CFLAGS_pn-grub = "" +SECURITY_CFLAGS_pn-grub-efi = "" +SECURITY_CFLAGS_pn-grub-efi-native = "" +SECURITY_CFLAGS_pn-grub-efi-x86-native = "" +SECURITY_CFLAGS_pn-grub-efi-i586-native = "" +SECURITY_CFLAGS_pn-grub-efi-x86-64-native = "" + +SECURITY_CFLAGS_pn-mkelfimage_x86 = "" + +SECURITY_CFLAGS_pn-valgrind = "${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 = " ${SECURITY_LDFLAGS}" + +SECURITY_LDFLAGS_remove_pn-gcc-runtime = "-fstack-protector-strong" +SECURITY_LDFLAGS_remove_pn-glibc = "-fstack-protector-strong" +SECURITY_LDFLAGS_remove_pn-glibc-initial = "-fstack-protector-strong" +# All xorg module drivers need to be linked this way as well and are +# handled in recipes-graphics/xorg-driver/xorg-driver-common.inc +SECURITY_LDFLAGS_pn-xserver-xorg = "${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}" |