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

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Date:	Fri, 10 Apr 2015 10:22:19 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
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

Em Fri, Apr 10, 2015 at 03:51:57PM +0900, Masami Hiramatsu escreveu:
> Ping?

Sorry for the delay, thought I had processed those already, done now,
will be in my next pull req.

Thanks for working on it, I tested both and all seems fine,

- Arnaldo
 
> (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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