linux-kernel - Re: [PATCH 1/5] tracing/events: make the filter files writable

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Date:	Mon, 23 Mar 2009 09:31:47 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] tracing/events: make the filter files writable

On Mon, Mar 23, 2009 at 09:25:56AM +0100, Ingo Molnar wrote:
> 
> * Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > We need the filter files to be writable, the current
> > filter file permissions make are only set readable.
> > 
> > Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> > ---
> >  kernel/trace/trace_events.c |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> > index 594d78a..19f61dd 100644
> > --- a/kernel/trace/trace_events.c
> > +++ b/kernel/trace/trace_events.c
> > @@ -706,7 +706,7 @@ event_subsystem_dir(const char *name, struct dentry *d_events)
> >  
> >  	system->preds = NULL;
> >  
> > -	entry = debugfs_create_file("filter", 0444, system->entry, system,
> > +	entry = debugfs_create_file("filter", 0644, system->entry, system,
> >  				    &ftrace_subsystem_filter_fops);
> >  	if (!entry)
> >  		pr_warning("Could not create debugfs "
> > @@ -769,7 +769,7 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
> >  		}
> >  	}
> >  
> > -	entry = debugfs_create_file("filter", 0444, call->dir, call,
> > +	entry = debugfs_create_file("filter", 0644, call->dir, call,
> 
> Interesting. Yesterday i tried the filter files and they worked - i 
> was able to create a 'comm == bash' filter for example. Does debugfs 
> ignore permissions perhaps?
> 
> 	Ingo


That's the second patch I see this week wich proposes a 444 file supposed
to be writable.
Usually it shouldn't even have been testable, so yes I think there is a
little problem.

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