linux-kernel - [PATCH 4.14 075/496] tls: retrun the correct IV in getsockopt

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Date:   Mon, 28 May 2018 11:57:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Boris Pismenny <borisp@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 075/496] tls: retrun the correct IV in getsockopt

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

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

From: Boris Pismenny <borisp@...lanox.com>

[ Upstream commit a1dfa6812b682eef750412dd5a90e7d38d7af068 ]

Current code returns four bytes of salt followed by four bytes of IV.
This patch returns all eight bytes of IV.

fixes: 3c4d7559159b ("tls: kernel TLS support")
Signed-off-by: Boris Pismenny <borisp@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/tls/tls_main.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -299,7 +299,8 @@ static int do_tls_getsockopt_tx(struct s
 			goto out;
 		}
 		lock_sock(sk);
-		memcpy(crypto_info_aes_gcm_128->iv, ctx->iv,
+		memcpy(crypto_info_aes_gcm_128->iv,
+		       ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 		       TLS_CIPHER_AES_GCM_128_IV_SIZE);
 		release_sock(sk);
 		if (copy_to_user(optval,