linux-kernel - [ 56/58] x86/alternatives: Fix p6 nops on non-modular kernels

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Message-Id: <20121004210642.527075904@linuxfoundation.org>
Date:	Thu,  4 Oct 2012 14:20:03 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Tomas Racek <tracek@...hat.com>,
	Avi Kivity <avi@...hat.com>, Michael Tokarev <mjt@....msk.ru>,
	Borislav Petkov <borislav.petkov@....com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Alan Cox <alan@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, Ben Jencks <ben@...ncks.net>,
	qemu-devel@...gnu.org
Subject: [ 56/58] x86/alternatives: Fix p6 nops on non-modular kernels

3.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Avi Kivity <avi@...hat.com>

commit cb09cad44f07044d9810f18f6f9a6a6f3771f979 upstream.

Probably a leftover from the early days of self-patching, p6nops
are marked __initconst_or_module, which causes them to be
discarded in a non-modular kernel.  If something later triggers
patching, it will overwrite kernel code with garbage.

Reported-by: Tomas Racek <tracek@...hat.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
Cc: Michael Tokarev <mjt@....msk.ru>
Cc: Borislav Petkov <borislav.petkov@....com>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: qemu-devel@...gnu.org
Cc: Anthony Liguori <anthony@...emonkey.ws>
Cc: H. Peter Anvin <hpa@...ux.intel.com>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Alan Cox <alan@...ux.intel.com>
Link: http://lkml.kernel.org/r/5034AE84.90708@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Ben Jencks <ben@...ncks.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/alternative.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -160,7 +160,7 @@ static const unsigned char * const k7_no
 #endif

 #ifdef P6_NOP1
-static const unsigned char  __initconst_or_module p6nops[] =
+static const unsigned char p6nops[] =
 {
 	P6_NOP1,
 	P6_NOP2,

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