netdev - [PATCH net v3 5/5] macsec: clear encryption keys from the stack after setting up offload

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Message-Id: <b9a29f40a05f49fa5def9d1a6575888d566b16b9.1667204360.git.sd@queasysnail.net>
Date:   Wed,  2 Nov 2022 22:33:16 +0100
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     netdev@...r.kernel.org
Cc:     Leon Romanovsky <leonro@...dia.com>,
        Antoine Tenart <atenart@...nel.org>,
        Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net v3 5/5] macsec: clear encryption keys from the stack after setting up offload

macsec_add_rxsa and macsec_add_txsa copy the key to an on-stack
offloading context to pass it to the drivers, but leaves it there when
it's done. Clear it with memzero_explicit as soon as it's not needed
anymore.

Fixes: 3cf3227a21d1 ("net: macsec: hardware offloading infrastructure")
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
Reviewed-by: Antoine Tenart <atenart@...nel.org>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/net/macsec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 700a8f96c6c2..85376d2f24ca 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -1839,6 +1839,7 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
 		       secy->key_len);
 
 		err = macsec_offload(ops->mdo_add_rxsa, &ctx);
+		memzero_explicit(ctx.sa.key, secy->key_len);
 		if (err)
 			goto cleanup;
 	}
@@ -2081,6 +2082,7 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
 		       secy->key_len);
 
 		err = macsec_offload(ops->mdo_add_txsa, &ctx);
+		memzero_explicit(ctx.sa.key, secy->key_len);
 		if (err)
 			goto cleanup;
 	}
-- 
2.38.0