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| author | Julien Dusser <julien.dusser@free.fr> | 2018-01-08 23:47:06 +0100 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2018-01-27 16:46:45 +0100 |
| commit | df0bd42fdeb76c9bc51b816c3df699db123c0024 (patch) | |
| tree | 1057e289580397c014b2c9c4460057e9e7ac8367 /include | |
| parent | ca7e8627dbbbcae0d1bfacea51d9b564617195de (diff) | |
| download | upstream-df0bd42fdeb76c9bc51b816c3df699db123c0024.tar.gz upstream-df0bd42fdeb76c9bc51b816c3df699db123c0024.tar.bz2 upstream-df0bd42fdeb76c9bc51b816c3df699db123c0024.zip | |
build: add hardened builds with PIE (ASLR) support
Introduce a configuration option to build a "hardened" OpenWrt with
ASLR PIE support.
Add new option PKG_ASLR_PIE to enable Address Space Layout Randomization (ASLR)
by building Position Independent Executables (PIE). This new option protects
against "return-to-text" attacks.
Busybox need a special care, link is done with ld, not gcc, leading to
unknown flags. Set BUSYBOX_DEFAULT_PIE instead and disable PKG_ASLR_PIE.
If other failing packages were found, PKG_ASLR_PIE:=0 should be added to
their Makefiles.
Original Work by: Yongkui Han <yonhan@cisco.com>
Signed-off-by: Julien Dusser <julien.dusser@free.fr>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hardened-ld-pie.specs | 2 | ||||
| -rw-r--r-- | include/hardening.mk | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/hardened-ld-pie.specs b/include/hardened-ld-pie.specs new file mode 100644 index 0000000000..7317b19a17 --- /dev/null +++ b/include/hardened-ld-pie.specs @@ -0,0 +1,2 @@ +*self_spec: ++ %{no-pie|static|r|shared:;:-pie} diff --git a/include/hardening.mk b/include/hardening.mk index c277081c51..06a61789ef 100644 --- 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 |