From: Jan Beulich <JBeulich@novell.com>
Date: Wed, 30 Sep 2009 10:22:11 +0000 (+0100)
Subject: x86: Don't leak 64-bit kernel register values to 32-bit processes
X-Git-Tag: v2.6.32-rc4~62^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=24e35800cdc4350fc34e2bed37b608a9e13ab3b6;p=pandora-kernel.git

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>
Cc: <stable@kernel.org>
LKML-Reference: <4AC34D73020000780001744A@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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