linux-kernel - Re: [GIT PULL] tracing: Fix misuse of strncpy to copy boot params

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Date:	Thu, 15 Oct 2009 10:01:13 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [GIT PULL] tracing: Fix misuse of strncpy to copy boot params

> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 4506826..621d81e 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -131,7 +131,7 @@ static char *default_bootup_tracer;
>  
>  static int __init set_ftrace(char *str)
>  {
> -	strncpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);
> +	strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);

Actually using strncpy() here is fine.

See how the str buf is used:

int register_tracer(struct tracer *type)
{
	...
	if (strncmp(default_bootup_tracer, type->name, MAX_TRACER_SIZE))
	...
}

>  	default_bootup_tracer = bootup_tracer_buf;
>  	/* We are using ftrace early, expand it */
>  	ring_buffer_expanded = 1;
--
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