[PATCH 06/11] stackprotector: update make rules

Tejun Heo
2009-02-09T13:42:44Z

Impact: no default -fno-stack-protector if stackp is enabled, cleanup

Stackprotector make rules had the following problems.

* cc support test and warning are scattered across makefile and
kernel/panic.c.

* -fno-stack-protector was always added regardless of configuration.

Update such that cc support test and warning are contained in makefile
and -fno-stack-protector is added iff stackp is turned off. While at
it, prepare for 32bit support.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
Makefile | 3 ++-
arch/x86/Makefile | 17 ++++++++++-------
kernel/panic.c | 4 ----
scripts/gcc-x86_64-has-stack-protector.sh | 4 +++-
4 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/Makefile b/Makefile
index d0634bc..1ab7cef 100644
--- a/Makefile
+++ b/Makefile
@@ -532,8 +532,9 @@ KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

# Force gcc to behave correct even for buggy distributions
-# Arch Makefiles may override this setting
+ifndef CONFIG_CC_STACKPROTECTOR
KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
+endif

ifdef CONFIG_FRAME_POINTER
KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index eb7b986..8597305 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -70,14 +70,17 @@ else
# this works around some issues with generating unwind tables in older gccs
# newer gccs do it by default
KBUILD_CFLAGS += -maccumulate-outgoing-args
+endif

- stackp := $(CONFIG_SHELL) $(srctree)/scripts/gcc-x86_64-has-stack-protector.sh
- stackp-$(CONFIG_CC_STACKPROTECTOR) := $(shell $(stackp) \
- "$(CC)" "-fstack-protector -DGCC_HAS_SP" )
- stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += $(shell $(stackp) \
- "$(CC)" -fstack-protector-all )
-
- KBUILD_CFLAGS += $(stackp-y)
+ifdef CONFIG_CC_STACKPROTECTOR
+ cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
+ ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC)),y)
+ stackp-y := -fstack-protector
+ stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += -fstack-protector-all
+ KBUILD_CFLAGS += $(stackp-y)
+ else
+ $(warning stack protector enabled but no compiler support)
+ endif
endif

# Don't unroll struct assignments with kmemcheck enabled
diff --git a/kernel/panic.c b/kernel/panic.c
index 33cab3d..32fe4ef 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -359,10 +359,6 @@ EXPORT_SYMBOL(warn_slowpath);

#ifdef CONFIG_CC_STACKPROTECTOR

-#ifndef GCC_HAS_SP
-#warning You have selected the CONFIG_CC_STACKPROTECTOR option, but the gcc used does not support this.
-#endif
-
/*
* Called when gcc's -fstack-protector feature is used, and
* gcc detects corruption of the on-stack canary value
diff --git a/scripts/gcc-x86_64-has-stack-protector.sh b/scripts/gcc-x86_64-has-stack-protector.sh
index 325c0a1..2d69fcd 100644
--- a/scripts/gcc-x86_64-has-stack-protector.sh
+++ b/scripts/gcc-x86_64-has-stack-protector.sh
@@ -2,5 +2,7 @@

echo "int foo(void) { char X[200]; return 3; }" | $1 -S -xc -c -O0 -mcmodel=kernel -fstack-protector - -o - 2> /dev/null | grep -q "%gs"
if [ "$?" -eq "0" ] ; then
- echo $2
+ echo y
+else
+ echo n
fi
--
1.6.0.2