From 36ecafc5ad17861e2bc1fb12af4cc97680e25942 Mon Sep 17 00:00:00 2001
From: Gregory Fong <gregory.0xf0@gmail.com>
Date: Wed, 12 Jun 2013 17:08:54 +0000
Subject: MIPS: initial stack protector support

Implements basic stack protector support based on ARM version in
c743f38013aeff58ef6252601e397b5ba281c633 , with Kconfig option,
constant canary value set at boot time, and script to check if
compiler actually supports stack protector.

Tested by creating a kernel module that writes past end of char[].

Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Cc: Carmelo Amoroso <carmelo.amoroso@st.com>
Patchwork: https://patchwork.linux-mips.org/patch/5448/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
 arch/mips/kernel/process.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'arch/mips/kernel')

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index c6a041d9d05d..7d62894f7e23 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -201,6 +201,12 @@ int dump_task_fpu(struct task_struct *t, elf_fpregset_t *fpr)
 	return 1;
 }
 
+#ifdef CONFIG_CC_STACKPROTECTOR
+#include <linux/stackprotector.h>
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
 /*
  *
  */
-- 
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