linux-kernel - [PATCH v2] nvmet-auth: update sc_c in target host hash calculation

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Message-ID: <20251104231414.1150771-1-alistair.francis@wdc.com>
Date: Wed,  5 Nov 2025 09:14:14 +1000
From: alistair23@...il.com
To: hare@...e.de,
	kbusch@...nel.org,
	axboe@...nel.dk,
	hch@....de,
	sagi@...mberg.me,
	kch@...dia.com,
	linux-nvme@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org,
	alistair23@...il.com,
	Alistair Francis <alistair.francis@....com>
Subject: [PATCH v2] nvmet-auth: update sc_c in target host hash calculation

From: Alistair Francis <alistair.francis@....com>

Commit 7e091add9c43 "nvme-auth: update sc_c in host response" added
the sc_c variable to the dhchap queue context structure which is
appropriately set during negotiate and then used in the host response.

This breaks secure concat connections with a Linux target as the target
code wasn't updated at the same time. This patch fixes this by adding a
new sc_c variable to the host hash calculations.

Fixes: 7e091add9c43 ("nvme-auth: update sc_c in host response")
Signed-off-by: Alistair Francis <alistair.francis@....com>
---
v2:
 - Rebase on v6.18-rc4
 - Add Fixes tag

 drivers/nvme/host/auth.c               | 1 +
 drivers/nvme/target/auth.c             | 5 +++--
 drivers/nvme/target/fabrics-cmd-auth.c | 1 +
 drivers/nvme/target/nvmet.h            | 1 +
 4 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/auth.c b/drivers/nvme/host/auth.c
index a01178caf15b..19980122d3d5 100644
--- a/drivers/nvme/host/auth.c
+++ b/drivers/nvme/host/auth.c
@@ -492,6 +492,7 @@ static int nvme_auth_dhchap_setup_host_response(struct nvme_ctrl *ctrl,
 	ret = crypto_shash_update(shash, buf, 2);
 	if (ret)
 		goto out;
+	memset(buf, 0, sizeof(buf));
 	*buf = chap->sc_c;
 	ret = crypto_shash_update(shash, buf, 1);
 	if (ret)
diff --git a/drivers/nvme/target/auth.c b/drivers/nvme/target/auth.c
index 02c23998e13c..f54a1425262d 100644
--- a/drivers/nvme/target/auth.c
+++ b/drivers/nvme/target/auth.c
@@ -298,7 +298,7 @@ int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response,
 	const char *hash_name;
 	u8 *challenge = req->sq->dhchap_c1;
 	struct nvme_dhchap_key *transformed_key;
-	u8 buf[4], sc_c = ctrl->concat ? 1 : 0;
+	u8 buf[4];
 	int ret;
 
 	hash_name = nvme_auth_hmac_name(ctrl->shash_id);
@@ -367,7 +367,7 @@ int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response,
 	ret = crypto_shash_update(shash, buf, 2);
 	if (ret)
 		goto out;
-	*buf = sc_c;
+	*buf = req->sq->sc_c;
 	ret = crypto_shash_update(shash, buf, 1);
 	if (ret)
 		goto out;
@@ -378,6 +378,7 @@ int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response,
 	ret = crypto_shash_update(shash, ctrl->hostnqn, strlen(ctrl->hostnqn));
 	if (ret)
 		goto out;
+	memset(buf, 0, sizeof(buf));
 	ret = crypto_shash_update(shash, buf, 1);
 	if (ret)
 		goto out;
diff --git a/drivers/nvme/target/fabrics-cmd-auth.c b/drivers/nvme/target/fabrics-cmd-auth.c
index 5d7d913927d8..16894302ebe1 100644
--- a/drivers/nvme/target/fabrics-cmd-auth.c
+++ b/drivers/nvme/target/fabrics-cmd-auth.c
@@ -43,6 +43,7 @@ static u8 nvmet_auth_negotiate(struct nvmet_req *req, void *d)
 		 data->auth_protocol[0].dhchap.halen,
 		 data->auth_protocol[0].dhchap.dhlen);
 	req->sq->dhchap_tid = le16_to_cpu(data->t_id);
+	req->sq->sc_c = le16_to_cpu(data->sc_c);
 	if (data->sc_c != NVME_AUTH_SECP_NOSC) {
 		if (!IS_ENABLED(CONFIG_NVME_TARGET_TCP_TLS))
 			return NVME_AUTH_DHCHAP_FAILURE_CONCAT_MISMATCH;
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 73da823a91fb..20be2fe43307 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -159,6 +159,7 @@ struct nvmet_sq {
 	bool			authenticated;
 	struct delayed_work	auth_expired_work;
 	u16			dhchap_tid;
+	u8			sc_c;
 	u8			dhchap_status;
 	u8			dhchap_step;
 	u8			*dhchap_c1;
-- 
2.51.1