linux-kernel - [PATCH] xen: Disable stack protector for irq helper

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Date:	Sun, 4 Oct 2009 20:30:13 +0200
From:	Bastian Blank <bastian@...di.eu.org>
To:	Ingo Molnar <mingo@...hat.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Stable Kernel <stable@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: [PATCH] xen: Disable stack protector for irq helper

The stack protector needs additional registers on x86_32, which are not
saved in calls to the small paravirt interrupt handlers. This leads to
early crashes as registers are overwritten and not saved by the caller
as instructed.

Signed-off-by: Bastian Blank <waldi@...ian.org>

diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 3bb4fc2..ac19398 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -5,9 +5,9 @@
 CFLAGS_REMOVE_irq.o = -pg
 endif
 
-# Make sure early boot has no stackprotector
 nostackp := $(call cc-option, -fno-stack-protector)
 CFLAGS_enlighten.o		:= $(nostackp)
+CFLAGS_irq.o			:= $(nostackp)
 CFLAGS_mmu.o			:= $(nostackp)
 
 obj-y		:= enlighten.o setup.o multicalls.o mmu.o irq.o \
-- 
Mind your own business, Spock.  I'm sick of your halfbreed interference.
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