linux-hardening - [PATCH] scsi: smartpqi: Replace all non-returning strlcpy with strscpy

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Date:   Tue, 30 May 2023 16:23:21 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Don Brace <don.brace@...rochip.com>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        storagedev@...rochip.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH] scsi: smartpqi: Replace all non-returning strlcpy with strscpy

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
---
 drivers/scsi/smartpqi/smartpqi_init.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 03de97cd72c2..74f608b9fc9d 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -6903,7 +6903,7 @@ static ssize_t pqi_lockup_action_store(struct device *dev,
 	char *action_name;
 	char action_name_buffer[32];
 
-	strlcpy(action_name_buffer, buffer, sizeof(action_name_buffer));
+	strscpy(action_name_buffer, buffer, sizeof(action_name_buffer));
 	action_name = strstrip(action_name_buffer);
 
 	for (i = 0; i < ARRAY_SIZE(pqi_lockup_actions); i++) {