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
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/20231023-strncpy-drivers-scsi-csiostor-csio_init-c-v1-1-5ea445b56864@google.com
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/csiostor/csio_init.c b/drivers/scsi/csiostor/csio_init.c
index 0c32faefad7ca16557e22d97fdbca9a20578a874..d649b7a2a879e833c9f4a7a630a8f358e8911023 100644 (file)
--- 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))