linux-kernel - Re: [PATCH linux-next v2] parisc: use strscpy() to instead of strncpy()

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Message-ID: <2298026.kkTNVCUfUN@daneel.sf-tec.de>
Date:   Tue, 27 Dec 2022 08:47:05 +0100
From:   Rolf Eike Beer <eike-kernel@...tec.de>
To:     james.bottomley@...senpartnership.com, yang.yang29@....com.cn
Cc:     deller@....de, linux-parisc@...r.kernel.org,
        linux-kernel@...r.kernel.org, xu.panda@....com.cn,
        yang.yang29@....com.cn
Subject: Re: [PATCH linux-next v2] parisc: use strscpy() to instead of strncpy()

Am Montag, 26. Dezember 2022, 11:40:04 CET schrieb yang.yang29@....com.cn:
> From: Xu Panda <xu.panda@....com.cn>
> 
> The implementation of strscpy() is more robust and safer.
> That's now the recommended way to copy NUL-terminated strings.
> 
> Signed-off-by: Xu Panda <xu.panda@....com.cn>
> Signed-off-by: Yang Yang <yang.yang29@....com>
> ---
> change for v2
>  - sizeof(in) is better and simplified, thanks for Helge Deller.
> ---
>  drivers/parisc/pdc_stable.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/parisc/pdc_stable.c b/drivers/parisc/pdc_stable.c
> index d6af5726ddf3..d3075445260b 100644
> --- a/drivers/parisc/pdc_stable.c
> +++ b/drivers/parisc/pdc_stable.c
> @@ -274,8 +274,7 @@ pdcspath_hwpath_write(struct pdcspath_entry *entry,
> const char *buf, size_t coun
> 
>  	/* We'll use a local copy of buf */
>  	count = min_t(size_t, count, sizeof(in)-1);
> -	strncpy(in, buf, count);
> -	in[count] = '\0';
> +	strscpy(in, buf, sizeof(in));

What is "count" now needed for? Looks like a write only variable at least in 
these hunks.

Eike
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