linux-kernel - [PATCH 1/2] x86: initialize stack canary in secondary start

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Date:	Thu, 17 Dec 2009 10:00:20 -0800
From:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
CC:	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] x86: initialize stack canary in secondary start

>From 06503838368350268a46528e134c1dad9f4f8c93 Mon Sep 17 00:00:00 2001
From: Jacob Pan <jacob.jun.pan@...el.com>
Date: Thu, 17 Sep 2009 07:36:43 -0700
Subject: [PATCH 1/2] x86: initialize stack canary in secondary start

some secondary clockevent setup code needs to call request_irq, which will
cause fake stack check failure in schedule() if voluntary preemption
model is chosen, it is safe to have stack canary initialized here early,
since start_secondary() does not return.

Signed-off-by: Jacob Pan <jacob.jun.pan@...el.com>
---
 arch/x86/kernel/smpboot.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 678d0b8..56ce974 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -48,6 +48,7 @@
 #include <linux/err.h>
 #include <linux/nmi.h>
 #include <linux/tboot.h>
+#include <linux/stackprotector.h>
 
 #include <asm/acpi.h>
 #include <asm/desc.h>
@@ -324,6 +325,9 @@ notrace static void __cpuinit start_secondary(void *unused)
 	/* enable local interrupts */
 	local_irq_enable();
 
+	/* to prevent fake stack check failure in clock setup */
+	boot_init_stack_canary();
+
 	x86_cpuinit.setup_percpu_clockev();
 
 	wmb();
-- 
1.6.5.3

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