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

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Date: Tue, 24 Oct 2023 13:01:51 -0700
From: Bart Van Assche <bvanassche@....org>
To: Justin Stitt <justinstitt@...gle.com>, Hannes Reinecke <hare@...e.de>,
 "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
Subject: Re: [PATCH] scsi: fcoe: replace deprecated strncpy with strscpy

On 10/24/23 12:52, Justin Stitt wrote:
> diff --git a/drivers/scsi/fcoe/fcoe_sysfs.c b/drivers/scsi/fcoe/fcoe_sysfs.c
> index e17957f8085c..7a3ca6cd3030 100644
> --- a/drivers/scsi/fcoe/fcoe_sysfs.c
> +++ b/drivers/scsi/fcoe/fcoe_sysfs.c
> @@ -279,12 +279,10 @@ static ssize_t store_ctlr_mode(struct device *dev,
>   	if (count > FCOE_MAX_MODENAME_LEN)
>   		return -EINVAL;
>   
> -	strncpy(mode, buf, count);
> +	strscpy(mode, buf, count);
>   
>   	if (mode[count - 1] == '\n')
>   		mode[count - 1] = '\0';
> -	else
> -		mode[count] = '\0';
>   
>   	switch (ctlr->enabled) {
>   	case FCOE_CTLR_ENABLED:

Please consider to remove the code for copying the sysfs string and to
use sysfs_match_string() instead.

Thanks,

Bart.