The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 5961060692f8b17cd2080620a3d27b95d2ae05ca Mon Sep 17 00:00:00 2001
From: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
Date: Mon, 29 Nov 2021 17:32:12 +0800
Subject: [PATCH] net/tls: Fix authentication failure in CCM mode
When the TLS cipher suite uses CCM mode, including AES CCM and
SM4 CCM, the first byte of the B0 block is flags, and the real
IV starts from the second byte. The XOR operation of the IV and
rec_seq should be skip this byte, that is, add the iv_offset.
Fixes: f295b3ae9f59 ("net/tls: Add support of AES128-CCM based ciphers")
Signed-off-by: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
Cc: Vakul Garg <vakul.garg@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v5.2+
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index d3e7ff90889e..dfe623a4e72f 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -521,7 +521,7 @@ static int tls_do_encryption(struct sock *sk,
memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv,
prot->iv_size + prot->salt_size);
- xor_iv_with_seq(prot, rec->iv_data, tls_ctx->tx.rec_seq);
+ xor_iv_with_seq(prot, rec->iv_data + iv_offset, tls_ctx->tx.rec_seq);
sge->offset += prot->prepend_size;
sge->length -= prot->prepend_size;
@@ -1499,7 +1499,7 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
else
memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
- xor_iv_with_seq(prot, iv, tls_ctx->rx.rec_seq);
+ xor_iv_with_seq(prot, iv + iv_offset, tls_ctx->rx.rec_seq);
/* Prepare AAD */
tls_make_aad(aad, rxm->full_len - prot->overhead_size +
