linux-kernel - [PATCH 3.16 217/306] scripts/has-stack-protector: add -fno-PIE

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Message-ID: <lsq.1487198500.885409608@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Sebastian Andrzej Siewior" <bigeasy@...utronix.de>,
        "Michal Marek" <mmarek@...e.com>
Subject: [PATCH 3.16 217/306] scripts/has-stack-protector: add -fno-PIE

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

commit 82031ea29e454b574bc6f49a33683a693ca5d907 upstream.

Adding -no-PIE to the fstack protector check. -no-PIE was introduced
before -fstack-protector so there is no need for a runtime check.

Without it the build stops:
|Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong available but compiler is broken

due to -mcmodel=kernel + -fPIE if -fPIE is enabled by default.

Tagging it stable so it is possible to compile recent stable kernels as
well.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Michal Marek <mmarek@...e.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 scripts/gcc-x86_64-has-stack-protector.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/scripts/gcc-x86_64-has-stack-protector.sh
+++ b/scripts/gcc-x86_64-has-stack-protector.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-echo "int foo(void) { char X[200]; return 3; }" | $* -S -x c -c -O0 -mcmodel=kernel -fstack-protector - -o - 2> /dev/null | grep -q "%gs"
+echo "int foo(void) { char X[200]; return 3; }" | $* -S -x c -c -O0 -mcmodel=kernel -fno-PIE -fstack-protector - -o - 2> /dev/null | grep -q "%gs"
 if [ "$?" -eq "0" ] ; then
 	echo y
 else