linux-hardening - Re: [PATCH] s390/sclp: replace deprecated strncpy with strtomem

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Message-ID: <your-ad-here.call-01698229402-ext-6422@work.hours>
Date: Wed, 25 Oct 2023 12:23:22 +0200
From: Vasily Gorbik <gor@...ux.ibm.com>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Heiko Carstens <hca@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] s390/sclp: replace deprecated strncpy with strtomem

On Mon, Oct 23, 2023 at 07:14:49PM +0000, Justin Stitt wrote:
> Let's move away from using strncpy() as it is deprecated [1].
> 
> Instead use strtomem() as `e.id` is already marked as nonstring:
> |       char id[4] __nonstring;
> 
> We don't need strtomem_pad() because `e` is already memset to 0 --
> rendering any additional NUL-padding useless.
> 
> 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/s390/char/sclp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thank you!