linux-kernel - [tip:x86/xsave] x86/xsaves: Clear reserved bits in xsave header

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Message-ID: <tip-21e726c4a3625a1038e97795b7aad97109ba7e19@git.kernel.org>
Date:	Fri, 30 May 2014 08:12:47 -0700
From:	tip-bot for Fenghua Yu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	fenghua.yu@...el.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/xsave] x86/xsaves: Clear reserved bits in xsave header

Commit-ID:  21e726c4a3625a1038e97795b7aad97109ba7e19
Gitweb:     http://git.kernel.org/tip/21e726c4a3625a1038e97795b7aad97109ba7e19
Author:     Fenghua Yu <fenghua.yu@...el.com>
AuthorDate: Thu, 29 May 2014 11:12:39 -0700
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Thu, 29 May 2014 14:33:00 -0700

x86/xsaves: Clear reserved bits in xsave header

The reserved bits (128~511) in the xsave header must be zero according to
X86 SDM. Clear the bits in this patch.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Link: http://lkml.kernel.org/r/1401387164-43416-12-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/kernel/i387.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index d5dd808..a9a4229 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -375,7 +375,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
 	/*
 	 * These bits must be zero.
 	 */
-	xsave_hdr->reserved1[0] = xsave_hdr->reserved1[1] = 0;
+	memset(xsave_hdr->reserved, 0, 48);
 
 	return ret;
 }
--
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