linux-kernel - [PATCH v4 2/5] nvmet: lock config semaphore when accessing DH-HMAC-CHAP key

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Date: Thu,  4 Apr 2024 17:44:57 +0200
From: Daniel Wagner <dwagner@...e.de>
To: James Smart <james.smart@...adcom.com>
Cc: Keith Busch <kbusch@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Hannes Reinecke <hare@...e.de>,
	linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Hannes Reinecke <hare@...nel.org>,
	Daniel Wagner <dwagner@...e.de>
Subject: [PATCH v4 2/5] nvmet: lock config semaphore when accessing DH-HMAC-CHAP key

From: Hannes Reinecke <hare@...nel.org>

When the DH-HMAC-CHAP key is accessed via configfs we need to take the
config semaphore as a reconnect might be running at the same time.

Signed-off-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
 drivers/nvme/target/auth.c     |  2 ++
 drivers/nvme/target/configfs.c | 22 +++++++++++++++++-----
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/target/auth.c b/drivers/nvme/target/auth.c
index 3ddbc3880cac..9afc28f1ffac 100644
--- a/drivers/nvme/target/auth.c
+++ b/drivers/nvme/target/auth.c
@@ -44,6 +44,7 @@ int nvmet_auth_set_key(struct nvmet_host *host, const char *secret,
 	dhchap_secret = kstrdup(secret, GFP_KERNEL);
 	if (!dhchap_secret)
 		return -ENOMEM;
+	down_write(&nvmet_config_sem);
 	if (set_ctrl) {
 		kfree(host->dhchap_ctrl_secret);
 		host->dhchap_ctrl_secret = strim(dhchap_secret);
@@ -53,6 +54,7 @@ int nvmet_auth_set_key(struct nvmet_host *host, const char *secret,
 		host->dhchap_secret = strim(dhchap_secret);
 		host->dhchap_key_hash = key_hash;
 	}
+	up_write(&nvmet_config_sem);
 	return 0;
 }
 
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 77a6e817b315..7c28b9c0ee57 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -1990,11 +1990,17 @@ static struct config_group nvmet_ports_group;
 static ssize_t nvmet_host_dhchap_key_show(struct config_item *item,
 		char *page)
 {
-	u8 *dhchap_secret = to_host(item)->dhchap_secret;
+	u8 *dhchap_secret;
+	ssize_t ret;
 
+	down_read(&nvmet_config_sem);
+	dhchap_secret = to_host(item)->dhchap_secret;
 	if (!dhchap_secret)
-		return sprintf(page, "\n");
-	return sprintf(page, "%s\n", dhchap_secret);
+		ret = sprintf(page, "\n");
+	else
+		ret = sprintf(page, "%s\n", dhchap_secret);
+	up_read(&nvmet_config_sem);
+	return ret;
 }
 
 static ssize_t nvmet_host_dhchap_key_store(struct config_item *item,
@@ -2018,10 +2024,16 @@ static ssize_t nvmet_host_dhchap_ctrl_key_show(struct config_item *item,
 		char *page)
 {
 	u8 *dhchap_secret = to_host(item)->dhchap_ctrl_secret;
+	ssize_t ret;
 
+	down_read(&nvmet_config_sem);
+	dhchap_secret = to_host(item)->dhchap_ctrl_secret;
 	if (!dhchap_secret)
-		return sprintf(page, "\n");
-	return sprintf(page, "%s\n", dhchap_secret);
+		ret = sprintf(page, "\n");
+	else
+		ret = sprintf(page, "%s\n", dhchap_secret);
+	up_read(&nvmet_config_sem);
+	return ret;
 }
 
 static ssize_t nvmet_host_dhchap_ctrl_key_store(struct config_item *item,
-- 
2.44.0