build: add hardened builds with PIE (ASLR) support

[openwrt/staging/chunkeey.git] / include / hardening.mk

diff --git a/include/hardening.mk b/include/hardening.mk
index c277081c510773620345bf03d9a6a6d3fe060b95..06a61789ef6bcc75bcbd6322bb71538a72f7199f 100644 (file)
--- a/include/hardening.mk
+++ b/include/hardening.mk
@@ -6,6 +6,7 @@
 #
 
 PKG_CHECK_FORMAT_SECURITY ?= 1
+PKG_ASLR_PIE ?= 1
 PKG_SSP ?= 1
 PKG_FORTIFY_SOURCE ?= 1
 PKG_RELRO ?= 1
@@ -15,6 +16,12 @@ ifdef CONFIG_PKG_CHECK_FORMAT_SECURITY
     TARGET_CFLAGS += -Wformat -Werror=format-security
   endif
 endif
+ifdef CONFIG_PKG_ASLR_PIE
+  ifeq ($(strip $(PKG_ASLR_PIE)),1)
+    TARGET_CFLAGS += -fPIC
+    TARGET_LDFLAGS += -specs=$(INCLUDE_DIR)/hardened-ld-pie.specs
+  endif
+endif
 ifdef CONFIG_PKG_CC_STACKPROTECTOR_REGULAR
   ifeq ($(strip $(PKG_SSP)),1)
     TARGET_CFLAGS += -fstack-protector