From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965187AbcCJDBV (ORCPT ); Wed, 9 Mar 2016 22:01:21 -0500 Received: from mail.kernel.org ([198.145.29.136]:51901 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933731AbcCJDAt (ORCPT ); Wed, 9 Mar 2016 22:00:49 -0500 From: Andy Lutomirski To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Borislav Petkov , Oleg Nesterov , Andrew Cooper , Brian Gerst , Andy Lutomirski Subject: [PATCH v2 06/12] x86/traps: Clear DR6 early in do_debug and improve the comment Date: Wed, 9 Mar 2016 19:00:29 -0800 Message-Id: <3857676e1be8fb27db4b89bbb1e2052b7f435ff4.1457578375.git.luto@kernel.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Leaving any bits set in DR6 on return from a debug exception is asking for trouble. Prevent it by writing zero right away and clarify the comment. Signed-off-by: Andy Lutomirski --- arch/x86/kernel/traps.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 19e6cfa501e3..6dddc220e3ed 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -593,6 +593,18 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code) ist_enter(regs); get_debugreg(dr6, 6); + /* + * The Intel SDM says: + * + * Certain debug exceptions may clear bits 0-3. The remaining + * contents of the DR6 register are never cleared by the + * processor. To avoid confusion in identifying debug + * exceptions, debug handlers should clear the register before + * returning to the interrupted task. + * + * Keep it simple: clear DR6 immediately. + */ + set_debugreg(0, 6); /* Filter out all the reserved bits which are preset to 1 */ dr6 &= ~DR6_RESERVED; @@ -616,9 +628,6 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code) if ((dr6 & DR_STEP) && kmemcheck_trap(regs)) goto exit; - /* DR6 may or may not be cleared by the CPU */ - set_debugreg(0, 6); - /* Store the virtualized DR6 value */ tsk->thread.debugreg6 = dr6; -- 2.5.0