linux-kernel - Re: [PATCH perf/core 2/2] perf-probe: Check the orphaned -x option

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Message-ID: <5527730D.8030508@hitachi.com>
Date:	Fri, 10 Apr 2015 15:51:57 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, namhyung@...nel.org,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH perf/core  2/2] perf-probe: Check the orphaned -x option

Ping?

(2015/04/01 19:25), Masami Hiramatsu wrote:
> To avoid probing in unintended binary, the orphaned -x option
> must be checked and warned.
> 
> Without this patch, following command sets up the probe in
> the kernel.
>   -----
>   # perf probe -a strcpy -x ./perf
>   Added new event:
>     probe:strcpy         (on strcpy)
> 
>   You can now use it in all perf tools, such as:
> 
>           perf record -e probe:strcpy -aR sleep 1
>   -----
> 
> But in this case, it seems that the user may want to probe
> in the perf binary. With this patch, perf-probe correctly
> handles the orphaned -x.
>   -----
>   # perf probe -a strcpy -x ./perf
>     Error: -x/-m must follow the probe definitions.
>   ...
>   -----
> 
> Reported-by: Jiri Olsa <jolsa@...hat.com>
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> ---
>  tools/perf/builtin-probe.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index 2df23e1..f7b1af6 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -56,6 +56,7 @@ static struct {
>  	bool mod_events;
>  	bool uprobes;
>  	bool quiet;
> +	bool target_used;
>  	int nevents;
>  	struct perf_probe_event events[MAX_PROBES];
>  	struct strlist *dellist;
> @@ -82,6 +83,7 @@ static int parse_probe_event(const char *str)
>  		pev->target = strdup(params.target);
>  		if (!pev->target)
>  			return -ENOMEM;
> +		params.target_used = true;
>  	}
>  
>  	/* Parse a perf-probe command into event */
> @@ -107,6 +109,7 @@ static int set_target(const char *ptr)
>  		params.target = strdup(ptr);
>  		if (!params.target)
>  			return -ENOMEM;
> +		params.target_used = false;
>  
>  		found = 1;
>  		buf = ptr + (strlen(ptr) - 3);
> @@ -207,6 +210,7 @@ static int opt_set_target(const struct option *opt, const char *str,
>  		}
>  		free(params.target);
>  		params.target = tmp;
> +		params.target_used = false;
>  		ret = 0;
>  	}
>  
> @@ -491,6 +495,12 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
>  	}
>  
>  	if (params.nevents) {
> +		/* Ensure the last given target is used */
> +		if (params.target && !params.target_used) {
> +			pr_warning("  Error: -x/-m must follow the probe definitions.\n");
> +			usage_with_options(probe_usage, options);
> +		}
> +
>  		ret = add_perf_probe_events(params.events, params.nevents,
>  					    params.max_probe_points,
>  					    params.force_add);
> 
> 


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@...achi.com


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