linux-kernel - [PATCH 3.14 72/76] EVM: Use crypto

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Date:	Sun, 14 Feb 2016 14:23:39 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Xiaofei Rex Guo <xiaofei.rex.guo@...el.com>,
	Ryan Ware <ware@...ux.intel.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	James Morris <james.l.morris@...cle.com>
Subject: [PATCH 3.14 72/76] EVM: Use crypto_memneq() for digest comparisons

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ryan Ware <ware@...ux.intel.com>

commit 613317bd212c585c20796c10afe5daaa95d4b0a1 upstream.

This patch fixes vulnerability CVE-2016-2085.  The problem exists
because the vm_verify_hmac() function includes a use of memcmp().
Unfortunately, this allows timing side channel attacks; specifically
a MAC forgery complexity drop from 2^128 to 2^12.  This patch changes
the memcmp() to the cryptographically safe crypto_memneq().

Reported-by: Xiaofei Rex Guo <xiaofei.rex.guo@...el.com>
Signed-off-by: Ryan Ware <ware@...ux.intel.com>
Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
Signed-off-by: James Morris <james.l.morris@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 security/integrity/evm/evm_main.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -22,6 +22,7 @@
 #include <linux/evm.h>
 #include <linux/magic.h>
 #include <crypto/hash.h>
+#include <crypto/algapi.h>
 #include "evm.h"
 
 int evm_initialized;
@@ -133,7 +134,7 @@ static enum integrity_status evm_verify_
 				   xattr_value_len, calc.digest);
 		if (rc)
 			break;
-		rc = memcmp(xattr_data->digest, calc.digest,
+		rc = crypto_memneq(xattr_data->digest, calc.digest,
 			    sizeof(calc.digest));
 		if (rc)
 			rc = -EINVAL;