linux-kernel - [PATCH 3.14 213/228] crypto: s390 - fix aes,des ctr mode concurrency finding.

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Date:	Wed,  4 Jun 2014 16:24:02 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Harald Freudenberger <freude@...ux.vnet.ibm.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 3.14 213/228] crypto: s390 - fix aes,des ctr mode concurrency finding.

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

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

From: Harald Freudenberger <freude@...ux.vnet.ibm.com>

commit 3901c1124ec5099254a9396085f7798153a7293f upstream.

An additional testcase found an issue with the last
series of patches applied: the fallback solution may
not save the iv value after operation. This very small
fix just makes sure the iv is copied back to the
walk/desc struct.

Signed-off-by: Harald Freudenberger <freude@...ux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/s390/crypto/aes_s390.c |    3 +++
 arch/s390/crypto/des_s390.c |    3 +++
 2 files changed, 6 insertions(+)

--- a/arch/s390/crypto/aes_s390.c
+++ b/arch/s390/crypto/aes_s390.c
@@ -820,6 +820,9 @@ static int ctr_aes_crypt(struct blkciphe
 		else
 			memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);
 		spin_unlock(&ctrblk_lock);
+	} else {
+		if (!nbytes)
+			memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);
 	}
 	/*
 	 * final block may be < AES_BLOCK_SIZE, copy only nbytes
--- a/arch/s390/crypto/des_s390.c
+++ b/arch/s390/crypto/des_s390.c
@@ -429,6 +429,9 @@ static int ctr_desall_crypt(struct blkci
 		else
 			memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);
 		spin_unlock(&ctrblk_lock);
+	} else {
+		if (!nbytes)
+			memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);
 	}
 	/* final block may be < DES_BLOCK_SIZE, copy only nbytes */
 	if (nbytes) {


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