From 6d7258ca937027ae86d6d5938d7ae10b6d68f4a4 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Wed, 13 May 2015 15:27:18 +0800 Subject: [PATCH] esp6: Use high-order sequence number bits for IV generation I noticed we were only using the low-order bits for IV generation when ESN is enabled. This is very bad because it means that the IV can repeat. We must use the full 64 bits. Signed-off-by: Herbert Xu Signed-off-by: Steffen Klassert --- net/ipv6/esp6.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c index 31f1b5d..7c07ce3 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -248,7 +248,8 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) aead_givcrypt_set_crypt(req, sg, sg, clen, iv); aead_givcrypt_set_assoc(req, asg, assoclen); aead_givcrypt_set_giv(req, esph->enc_data, - XFRM_SKB_CB(skb)->seq.output.low); + XFRM_SKB_CB(skb)->seq.output.low + + ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32)); ESP_SKB_CB(skb)->tmp = tmp; err = crypto_aead_givencrypt(req); -- 2.7.4