On Wed, 2006-08-16 at 20:55 +0200, Sam Ravnborg wrote:
> stack-protector = $(shell $(CONFIG_SHELL) \
>
> $(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(1))
> cflags-$(CONFIG_CC_STACKPROTECTOR) += \
> $(call stack-protector, $(CC) -fstack-protector)
> cflags-$(CONFIG_CC_STACKPROTECTOR_ALL) += \
> $(call stack-protector, $(CC)
> -fstack-protector-all)
ok that works (I've tested it ;)
Subject: [patch 5/5] Add the -fstack-protector option to the CFLAGS
From: Arjan van de Ven <[email protected]>
Add a feature check that checks that the gcc compiler has stack-protector
support and has the bugfix for PR28281 to make this work in kernel mode.
The easiest solution I could find was to have a shell script in scripts/
to do the detection; if needed we can make this fancier in the future
without making the makefile too complex.
Signed-off-by: Arjan van de Ven <[email protected]>
CC: Andi Kleen <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
---
arch/x86_64/Makefile | 3 +++
scripts/gcc-x86_64-has-stack-protector.sh | 8 ++++++++
2 files changed, 11 insertions(+)
Index: linux-2.6.18-rc4-stackprot/arch/x86_64/Makefile
===================================================================
--- linux-2.6.18-rc4-stackprot.orig/arch/x86_64/Makefile
+++ linux-2.6.18-rc4-stackprot/arch/x86_64/Makefile
@@ -55,6 +55,15 @@ cflags-y += $(call cc-option,-funit-at-a
# prevent gcc from generating any FP code by mistake
cflags-y += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
+
+stack-protector = $(shell $(CONFIG_SHELL) \
+ $(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(1))
+
+cflags-$(CONFIG_CC_STACKPROTECTOR) += \
+ $(call stack-protector, $(CC) -fstack-protector)
+cflags-$(CONFIG_CC_STACKPROTECTOR_ALL) += \
+ $(call stack-protector, $(CC) -fstack-protector-all)
+
CFLAGS += $(cflags-y)
CFLAGS_KERNEL += $(cflags-kernel-y)
AFLAGS += -m64
Index: linux-2.6.18-rc4-stackprot/scripts/gcc-x86_64-has-stack-protector.sh
===================================================================
--- /dev/null
+++ linux-2.6.18-rc4-stackprot/scripts/gcc-x86_64-has-stack-protector.sh
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+echo "int foo(void) { char X[200]; return 3; }" | $1 -S -xc -c -O0 -mcmodel=kernel -fstack-protector - -o - | grep -q "%gs"
+if [ "$?" -eq "0" ] ; then
+ echo $2
+fi
-
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