linux-kernel - [PATCH 2/3] scripts/has-stack-protector: add -fno-PIE

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Message-Id: <20161104183940.30692-3-bigeasy@linutronix.de>
Date:   Fri,  4 Nov 2016 19:39:39 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Michal Marek <mmarek@...e.com>, linux-kbuild@...r.kernel.org,
        x86@...nel.org, Al Viro <viro@...IV.linux.org.uk>,
        Ben Hutchings <ben@...adent.org.uk>,
        Sven Joachim <svenjoac@....de>,
        "Austin S. Hemmelgarn" <ahferroin7@...il.com>,
        Borislav Petkov <bp@...en8.de>
Subject: [PATCH 2/3] scripts/has-stack-protector: add -fno-PIE

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.

Cc: stable@...r.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 scripts/gcc-x86_64-has-stack-protector.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/gcc-x86_64-has-stack-protector.sh b/scripts/gcc-x86_64-has-stack-protector.sh
index 973e8c141567..17867e723a51 100755
--- 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
-- 
2.10.2