linux-kernel - [PATCH 6/9] x86: Known exploit detection for CVE-2013-0268

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Date:	Thu, 12 Dec 2013 17:52:29 +0100
From:	vegard.nossum@...cle.com
To:	linux-kernel@...r.kernel.org
Cc:	Vegard Nossum <vegard.nossum@...cle.com>,
	Alan Cox <alan@...ux.intel.com>, Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 6/9] x86: Known exploit detection for CVE-2013-0268

From: Vegard Nossum <vegard.nossum@...cle.com>

See c903f0456bc69176912dee6dd25c6a66ee1aed00.

Cc: Alan Cox <alan@...ux.intel.com>
Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>
---
 arch/x86/kernel/msr.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index 88458fa..fad04f1 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -37,6 +37,7 @@
 #include <linux/notifier.h>
 #include <linux/uaccess.h>
 #include <linux/gfp.h>
+#include <linux/exploit.h>
 
 #include <asm/processor.h>
 #include <asm/msr.h>
@@ -174,8 +175,10 @@ static int msr_open(struct inode *inode, struct file *file)
 	unsigned int cpu = iminor(file_inode(file));
 	struct cpuinfo_x86 *c;
 
-	if (!capable(CAP_SYS_RAWIO))
+	if (!capable(CAP_SYS_RAWIO)) {
+		exploit("CVE-2013-0268");
 		return -EPERM;
+	}
 
 	if (cpu >= nr_cpu_ids || !cpu_online(cpu))
 		return -ENXIO;	/* No such CPU */
-- 
1.7.10.4

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