linux-kernel - Re: uprobe: checking probe event include directory

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Message-ID: <20120717172736.GA6854@linux.vnet.ibm.com>
Date:	Tue, 17 Jul 2012 22:57:36 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	Jovi Zhang <bookjovi@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: uprobe: checking probe event include directory

* Frederic Weisbecker <fweisbec@...il.com> [2012-07-17 12:59:39]:

> On Tue, Jul 17, 2012 at 06:12:28PM +0800, Jovi Zhang wrote:
> > From 16ed13ee9098ae01705e8456005d1ad6d9909128 Mon Sep 17 00:00:00 2001
> > From: Jovi Zhang <bookjovi@...il.com>
> > Date: Wed, 18 Jul 2012 01:16:23 +0800
> > Subject: [PATCH] uprobe: checking probe event include directory
> > 
> > Currently below command run successful:
> > $ echo 'p /bin:0x4245c0' > /sys/kernel/debug/tracing/uprobe_events

good catch.

> > 
> > this don't make sense, because /bin is a directory,
> > so make this checking earily, not report error untill probe enable.
> > 
> > Signed-off-by: Jovi Zhang <bookjovi@...il.com>
> 
> Adding Srikar in Cc.
> 
> > ---
> >  kernel/trace/trace_uprobe.c |    5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> > index 85158fa..cf382de 100644
> > --- a/kernel/trace/trace_uprobe.c
> > +++ b/kernel/trace/trace_uprobe.c
> > @@ -259,6 +259,11 @@ static int create_trace_uprobe(int argc, char **argv)
> >  		goto fail_address_parse;
> > 
> >  	inode = igrab(path.dentry->d_inode);
> > +	 if (S_ISDIR(inode->i_mode)) {

How about checking for regular files but not directory.
i.e it should avoid tracing special files 

Something like: 

	if (!S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) {

> > +		ret = -EINVAL;
> > +		pr_info("probe file cannot be directory.\n");

we could drop the pr_info line here, since we would any print we
failed to parse the address.

Probably you could change the last pr_info from 

pr_info("Failed to parse address.\n");

to 

pr_info("Failed to parse address or file.\n");


-- 
Thanks and Regards
Srikar
> > +		goto fail_address_parse;
> > +	}
> > 
> >  	argc -= 2;
> >  	argv += 2;
> > -- 
> > 1.7.9.7
> 

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