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build: Add _FORTIFY_SOURCE=3 support

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Add support for _FORTIFY_SOURCE level 3.

This is supported with glibc and with musl libc.

Link: https://github.com/openwrt/openwrt/pull/20313
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Hauke Mehrtens 2025-10-05 23:30:17 +02:00
parent 6268692bd2
commit 93f86627c4
3 changed files with 10 additions and 2 deletions
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6
config/Config-build.in
View File

@ -358,9 +358,11 @@ menu "Global build settings"
config PKG_FORTIFY_SOURCE_NONE
bool "None"
config PKG_FORTIFY_SOURCE_1
bool "Conservative"
bool "Conservative Level 1"
config PKG_FORTIFY_SOURCE_2
bool "Aggressive"
bool "Aggressive Level 2"
config PKG_FORTIFY_SOURCE_3
bool "Aggressive Level 3"
endchoice
choice

5
include/hardening.mk
View File

@ -51,6 +51,11 @@ ifdef CONFIG_PKG_FORTIFY_SOURCE_2
TARGET_CFLAGS += -D_FORTIFY_SOURCE=2
endif
endif
ifdef CONFIG_PKG_FORTIFY_SOURCE_3
ifeq ($(strip $(PKG_FORTIFY_SOURCE)),1)
TARGET_CFLAGS += -D_FORTIFY_SOURCE=3
endif
endif
ifdef CONFIG_PKG_RELRO_PARTIAL
ifeq ($(strip $(PKG_RELRO)),1)
TARGET_CFLAGS += -Wl,-z,relro

1
toolchain/glibc/common.mk
View File

@ -68,6 +68,7 @@ GLIBC_CONFIGURE:= \
$(if $(CONFIG_PKG_RELRO_FULL),--enable-bind-now) \
$(if $(CONFIG_PKG_FORTIFY_SOURCE_1),--enable-fortify-source=1) \
$(if $(CONFIG_PKG_FORTIFY_SOURCE_2),--enable-fortify-source=2) \
$(if $(CONFIG_PKG_FORTIFY_SOURCE_3),--enable-fortify-source=3) \
--enable-kernel=6.6.0
export libc_cv_ssp=no