linux-kernel - Re: [PATCH] tools lib api fs: fix gcc9 compilation error

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Message-ID: <20191218031019.GB419@tigerII.localdomain>
Date:   Wed, 18 Dec 2019 12:10:19 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Andrey Zhizhikin <andrey.z@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, kafai@...com,
        songliubraving@...com, yhs@...com, andriin@...com,
        sergey.senozhatsky@...il.com, pmladek@...e.com,
        wangkefeng.wang@...wei.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] tools lib api fs: fix gcc9 compilation error

On (19/12/11 08:01), Andrey Zhizhikin wrote:
[..]
> @@ -210,6 +210,7 @@ static bool fs__env_override(struct fs *fs)
>  	size_t name_len = strlen(fs->name);
>  	/* name + "_PATH" + '\0' */
>  	char upper_name[name_len + 5 + 1];
> +
>  	memcpy(upper_name, fs->name, name_len);
>  	mem_toupper(upper_name, name_len);
>  	strcpy(&upper_name[name_len], "_PATH");
> @@ -219,7 +220,8 @@ static bool fs__env_override(struct fs *fs)
>  		return false;
>  
>  	fs->found = true;
> -	strncpy(fs->path, override_path, sizeof(fs->path));
> +	strncpy(fs->path, override_path, sizeof(fs->path) - 1);
> +	fs->path[sizeof(fs->path) - 1] = '\0';

I think the trend these days is to prefer stracpy/strscpy over
strcpy/strlcpy/strncpy.

	-ss