From 329e7f58ae607c2dccc7e523e56c60d373dc6e4b Mon Sep 17 00:00:00 2001
From: Jan Beulich <JBeulich@novell.com>
Date: Wed, 7 Oct 2009 17:34:09 -0400
Subject: [PATCH] x86: Don't leak 64-bit kernel register values to 32-bit
 processes

commit 24e35800cdc4350fc34e2bed37b608a9e13ab3b6 upstream

x86: Don't leak 64-bit kernel register values to 32-bit processes

While 32-bit processes can't directly access R8...R15, they can
gain access to these registers by temporarily switching themselves
into 64-bit mode.

Therefore, registers not preserved anyway by called C functions
(i.e. R8...R11) must be cleared prior to returning to user mode.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
LKML-Reference: <4AC34D73020000780001744A@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
Reading git-format-patch failed