linux-kernel - Re: [PATCH v5 1/3] tracing: eprobe: remove duplicate is_good

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Message-ID: <20220617214942.1dbfb55b@gandalf.local.home>
Date:   Fri, 17 Jun 2022 21:49:42 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Linyu Yuan <quic_linyyuan@...cinc.com>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/3] tracing: eprobe: remove duplicate is_good_name()
 operation

On Tue, 14 Jun 2022 09:04:56 +0800
Linyu Yuan <quic_linyyuan@...cinc.com> wrote:

> traceprobe_parse_event_name() already validate group and event name,
> there is no need to call is_good_name() after it.
> 
> Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> Signed-off-by: Linyu Yuan <quic_linyyuan@...cinc.com>
> ---
> v2: drop v1 change as it is NACK.
>     add it to remove duplicate is_good_name().
> v3: move it as first patch.
> v4: no change
> v5: add Acked-by tag
> 
>  kernel/trace/trace_eprobe.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
> index 7d44785..17d64e3 100644
> --- a/kernel/trace/trace_eprobe.c
> +++ b/kernel/trace/trace_eprobe.c
> @@ -878,16 +878,12 @@ static int __trace_eprobe_create(int argc, const char *argv[])
>  		sanitize_event_name(buf1);
>  		event = buf1;
>  	}
> -	if (!is_good_name(event) || !is_good_name(group))
> -		goto parse_error;
>  

Tom replied that the above may be an issue. You ignored his response.

-- Steve


>  	sys_event = argv[1];
>  	ret = traceprobe_parse_event_name(&sys_event, &sys_name, buf2,
>  					  sys_event - argv[1]);
>  	if (ret || !sys_name)
>  		goto parse_error;
> -	if (!is_good_name(sys_event) || !is_good_name(sys_name))
> -		goto parse_error;
>  
>  	mutex_lock(&event_mutex);
>  	event_call = find_and_get_event(sys_name, sys_event);