Patch "crypto: talitos - Fix timing leak in ESP ICV verification" has been added to the 4.3-stable tree

Patch "crypto: talitos - Fix timing leak in ESP ICV verification" has been added to the 4.3-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    crypto: talitos - Fix timing leak in ESP ICV verification

to the 4.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     crypto-talitos-fix-timing-leak-in-esp-icv-verification.patch
and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 79960943fdc114fd4583c9ab164b5c89da7aa601 Mon Sep 17 00:00:00 2001
From: David Gstir <david@sigma-star.at>
Date: Sun, 15 Nov 2015 17:14:42 +0100
Subject: crypto: talitos - Fix timing leak in ESP ICV verification

From: David Gstir <david@sigma-star.at>

commit 79960943fdc114fd4583c9ab164b5c89da7aa601 upstream.

Using non-constant time memcmp() makes the verification of the authentication
tag in the decrypt path vulnerable to timing attacks. Fix this by using
crypto_memneq() instead.

Signed-off-by: David Gstir <david@sigma-star.at>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/crypto/talitos.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1015,7 +1015,7 @@ static void ipsec_esp_decrypt_swauth_don
 		} else
 			oicv = (char *)&edesc->link_tbl[0];
 
-		err = memcmp(oicv, icv, authsize) ? -EBADMSG : 0;
+		err = crypto_memneq(oicv, icv, authsize) ? -EBADMSG : 0;
 	}
 
 	kfree(edesc);


Patches currently in stable-queue which might be from david@sigma-star.at are

queue-4.3/crypto-nx-fix-timing-leak-in-gcm-and-ccm-decryption.patch
queue-4.3/crypto-talitos-fix-timing-leak-in-esp-icv-verification.patch