linux-hardening - [PATCH] scsi: csiostor: replace deprecated strncpy with strscpy

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Message-ID: <20231023-strncpy-drivers-scsi-csiostor-csio_init-c-v1-1-5ea445b56864@google.com>
Date: Mon, 23 Oct 2023 20:26:13 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: "James E.J. Bottomley" <jejb@...ux.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org, Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] scsi: csiostor: replace deprecated strncpy with strscpy

strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

`hw` is kzalloc'd just before this string assignment:
|       hw = kzalloc(sizeof(struct csio_hw), GFP_KERNEL);

... which means any NUL-padding is redundant.

Since  CSIO_DRV_VERSION is a small string literal (smaller than
sizeof(dest)):

... there is functionally no change in this swap from strncpy() to
strscpy(). Nonetheless, let's make the change for robustness' sake -- as
it will ensure that drv_version is _always_ NUL-terminated.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
Note: build-tested only.

Found with: $ rg "strncpy\("
---
 drivers/scsi/csiostor/csio_init.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/csiostor/csio_init.c b/drivers/scsi/csiostor/csio_init.c
index 0c32faefad7c..d649b7a2a879 100644
--- a/drivers/scsi/csiostor/csio_init.c
+++ b/drivers/scsi/csiostor/csio_init.c
@@ -521,7 +521,8 @@ static struct csio_hw *csio_hw_alloc(struct pci_dev *pdev)
 		goto err;
 
 	hw->pdev = pdev;
-	strncpy(hw->drv_version, CSIO_DRV_VERSION, 32);
+	strscpy(hw->drv_version, CSIO_DRV_VERSION,
+		sizeof(hw->drv_version));
 
 	/* memory pool/DMA pool allocation */
 	if (csio_resource_alloc(hw))

---
base-commit: 9c5d00cb7b6bbc5a7965d9ab7d223b5402d1f02c
change-id: 20231023-strncpy-drivers-scsi-csiostor-csio_init-c-9c96b2f77e22

Best regards,
--
Justin Stitt <justinstitt@...gle.com>