From: Bastian Blank <bastian@waldi.eu.org>
To: Ingo Molnar <mingo@redhat.com>
Cc: Xen-devel <xen-devel@lists.xensource.com>,
Jeremy Fitzhardinge <jeremy@goop.org>,
the arch/x86 maintainers <x86@kernel.org>,
Stable Kernel <stable@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [PATCH] xen: Disable stack protector for irq helper
Date: Sun, 4 Oct 2009 20:30:13 +0200 [thread overview]
Message-ID: <20091004183013.GA26101@wavehammer.waldi.eu.org> (raw)
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@debian.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.
next reply other threads:[~2009-10-04 18:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-04 18:30 Bastian Blank [this message]
2009-10-04 23:06 ` [PATCH] xen: Disable stack protector for irq helper Jeremy Fitzhardinge
2009-10-05 1:35 ` Bastian Blank
2009-10-05 17:21 ` Jeremy Fitzhardinge
2009-10-05 22:43 ` Bastian Blank
2009-10-06 0:36 ` Jeremy Fitzhardinge
2009-10-06 3:30 ` Bastian Blank
2009-10-06 19:01 ` Jeremy Fitzhardinge
2009-10-07 16:35 ` Bastian Blank
2009-10-08 0:33 ` Jeremy Fitzhardinge
2009-10-12 20:52 ` Ingo Molnar
2009-10-12 21:12 ` Bastian Blank
2009-10-12 22:20 ` Jeremy Fitzhardinge
2009-10-12 23:32 ` Jeremy Fitzhardinge
2009-10-13 7:25 ` [tip:x86/urgent] x86/paravirt: Use normal calling sequences for irq enable/disable tip-bot for Jeremy Fitzhardinge
2009-10-05 1:52 ` [PATCH] xen: fbdev frontend needs xenbus frontend Bastian Blank
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