linux-kernel - Re: [PATCH] tracing: use strlcpy instead of strncpy

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Message-ID: <4A11CB5C.8070800@gmail.com>
Date:	Mon, 18 May 2009 22:55:56 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
CC:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing: use strlcpy instead of strncpy

On 05/18/2009 01:35 PM, Lai Jiangshan wrote:
> strlcpy() will add '\0' for the copied string.
> 
> [Impact] cleanup
...
> --- a/kernel/trace/trace_branch.c
> +++ b/kernel/trace/trace_branch.c
> @@ -67,10 +67,8 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
>  		p--;
>  	p++;
>  
> -	strncpy(entry->func, f->func, TRACE_FUNC_SIZE);
> -	strncpy(entry->file, p, TRACE_FILE_SIZE);
> -	entry->func[TRACE_FUNC_SIZE] = 0;
> -	entry->file[TRACE_FILE_SIZE] = 0;
> +	strlcpy(entry->func, f->func, TRACE_FUNC_SIZE);
> +	strlcpy(entry->file, p, TRACE_FILE_SIZE);

Hmm, this is not the same. +1 is missing here.
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