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From:   SeongJae Park <sj@kernel.org>
To:     yang.yang29@zte.com.cn
Cc:     sj@kernel.org, akpm@linux-foundation.org, damon@lists.linux.dev,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        xu.panda@zte.com.cn
Subject: Re: [PATCH linux-next] mm/damon/sysfs-schemes: use strscpy() to instead of strncpy()
Date:   Mon,  9 Jan 2023 18:30:26 +0000
Message-Id: <20230109183026.157393-1-sj@kernel.org>
In-Reply-To: <202301091946553770006@zte.com.cn>
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Hello Xu,


Thank you for this patch.

On Mon, 9 Jan 2023 19:46:55 +0800 (CST) <yang.yang29@zte.com.cn> wrote:

> From: Xu Panda <xu.panda@zte.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@zte.com.cn>
> Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>

Reviewed-by: SeongJae Park <sj@kernel.org>

Thanks,
SJ

> ---
>  mm/damon/sysfs-schemes.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
> index f0dabe3e2dc0..86edca66aab1 100644
> --- a/mm/damon/sysfs-schemes.c
> +++ b/mm/damon/sysfs-schemes.c
> @@ -353,8 +353,7 @@ static ssize_t memcg_path_store(struct kobject *kobj,
>  	if (!path)
>  		return -ENOMEM;
> 
> -	strncpy(path, buf, count);
> -	path[count] = '\0';
> +	strscpy(path, buf, count + 1);
>  	filter->memcg_path = path;
>  	return count;
>  }
> -- 
> 2.15.2