linux-kernel - Re: [PATCH] perf probe: fix module name matching

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Date:	Mon, 8 Aug 2016 16:34:00 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <mhiramat@...nel.org>
Cc:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf probe: fix module name matching

Em Fri, Aug 05, 2016 at 09:17:29PM +0900, Masami Hiramatsu escreveu:
> On Fri, 05 Aug 2016 12:41:03 +0300
> Konstantin Khlebnikov <khlebnikov@...dex-team.ru> wrote:
> 
> > If module is "module" then dso->short_name is "[module]".
> > Substring comparing is't enough: "raid10" matches to "[raid1]".
> > This patch also checks terminating zero in module name.
> 
> Right, just one comment on this patch.
> 
> > 
> > Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> > ---
> >  tools/perf/util/probe-event.c |    4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> > index 953dc1ab2ed7..c27b7aca4a6d 100644
> > --- a/tools/perf/util/probe-event.c
> > +++ b/tools/perf/util/probe-event.c
> > @@ -170,8 +170,10 @@ static struct map *kernel_get_module_map(const char *module)
> >  		module = "kernel";
> >  
> >  	for (pos = maps__first(maps); pos; pos = map__next(pos)) {
> > +		/* short_name is "[module]" */
> >  		if (strncmp(pos->dso->short_name + 1, module,
> > -			    pos->dso->short_name_len - 2) == 0) {
> > +			    pos->dso->short_name_len - 2) == 0 &&
> > +		    module[pos->dso->short_name_len - 2] == 0) {
> 
> Here, please use '\0' instead of 0, because "module" should points a null
> terminated string.

I can do this myself, with that, can I have your Acked-by?
 
> Thanks,
> 
> >  			return pos;
> >  		}
> >  	}
> > 
> 
> 
> -- 
> Masami Hiramatsu <mhiramat@...nel.org>