linux-kernel - Re: [PATCH v2] scsi: elx: libefc: replace deprecated strncpy with strscpy

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Message-ID: <202310261045.5D815BE@keescook>
Date:   Thu, 26 Oct 2023 10:45:28 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     James Smart <james.smart@...adcom.com>,
        Ram Vegesna <ram.vegesna@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] scsi: elx: libefc: replace deprecated strncpy with
 strscpy_pad/memcpy

On Thu, Oct 26, 2023 at 01:53:13AM +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.
> 
> To keep node->current_state_name and node->prev_state_name NUL-padded
> and NUL-terminated let's use strscpy_pad() as this implicitly provides
> both.
> 
> For the swap between the two, a simple memcpy will suffice.
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

Thanks! I think this looks good now.

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

-- 
Kees Cook