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

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Message-ID: <202310241730.7AA375902@keescook>
Date:   Tue, 24 Oct 2023 17:30:51 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] scsi: csiostor: replace deprecated strncpy with strscpy

On Mon, Oct 23, 2023 at 08:26:13PM +0000, Justin Stitt wrote:
> 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>

Another direct replacement.

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook