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net: macsec: fix the length used to copy the key for offloading 

The key length used when offloading macsec to Ethernet or PHY drivers
was set to MACSEC_KEYID_LEN (16), which is an issue as:
- This was never meant to be the key length.
- The key length can be > 16.

Fix this by using MACSEC_MAX_KEY_LEN to store the key (the max length
accepted in uAPI) and secy->key_len to copy it.

Fixes: 3cf3227a21 ("net: macsec: hardware offloading infrastructure")
Reported-by: Lior Nahmanson <liorna@nvidia.com>
Signed-off-by: Antoine Tenart <atenart@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Antoine Tenart 2021-06-24 11:38:28 +02:00 committed by David S. Miller
parent abe90454f0
commit 1f7fe51211
2 changed files with 3 additions and 3 deletions
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4
drivers/net/macsec.c
View File

@ -1819,7 +1819,7 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
ctx.sa.rx_sa = rx_sa;
ctx.secy = secy;
memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
MACSEC_KEYID_LEN);
secy->key_len);
err = macsec_offload(ops->mdo_add_rxsa, &ctx);
if (err)
@ -2061,7 +2061,7 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
ctx.sa.tx_sa = tx_sa;
ctx.secy = secy;
memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
MACSEC_KEYID_LEN);
secy->key_len);
err = macsec_offload(ops->mdo_add_txsa, &ctx);
if (err)

2
include/net/macsec.h
View File

@ -241,7 +241,7 @@ struct macsec_context {
struct macsec_rx_sc *rx_sc;
struct {
unsigned char assoc_num;
u8 key[MACSEC_KEYID_LEN];
u8 key[MACSEC_MAX_KEY_LEN];
union {
struct macsec_rx_sa *rx_sa;
struct macsec_tx_sa *tx_sa;