From 6533b7c16ee5712041b4e324100550e02a9a5dda Mon Sep 17 00:00:00 2001
From: Christophe Leroy <christophe.leroy@c-s.fr>
Date: Tue, 22 Nov 2016 11:49:30 +0100
Subject: powerpc: Initial stack protector (-fstack-protector) support

Partialy copied from commit c743f38013aef ("ARM: initial stack protector
(-fstack-protector) support")

This is the very basic stuff without the changing canary upon
task switch yet.  Just the Kconfig option and a constant canary
value initialized at boot time.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 arch/powerpc/kernel/process.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'arch/powerpc/kernel/process.c')

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 5b62e8c36210..9da9a42595ce 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -64,6 +64,12 @@
 #include <linux/kprobes.h>
 #include <linux/kdebug.h>
 
+#ifdef CONFIG_CC_STACKPROTECTOR
+#include <linux/stackprotector.h>
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
 /* Transactional Memory debug */
 #ifdef TM_DEBUG_SW
 #define TM_DEBUG(x...) printk(KERN_INFO x)
-- 
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