linux-kernel - Re: inotify and /proc/<pid>

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Message-ID: <13954.1185931991@turing-police.cc.vt.edu>
Date:	Tue, 31 Jul 2007 21:33:11 -0400
From:	Valdis.Kletnieks@...edu
To:	trelane@...itasaru.net
Cc:	Al Viro <viro@....linux.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: inotify and /proc/<pid>

On Mon, 30 Jul 2007 22:56:27 CDT, Joseph Pingenot said:
> From Al Viro on Tuesday, 31 July, 2007:
> >On Mon, Jul 30, 2007 at 10:40:59PM -0500, Joseph Pingenot wrote:
> >> I'm trying to implement pwait.  It blocks until a specified PID exits,
> >>   and then it exits.
> >er... ptrace(2)?
> 
> Should work for most common usage scenarios, although will suspect that it
>   won't for for processes owned by another user (at least, I hope
>   it wouldn't).
> 
> What is dangerous about inotify on a proc file?

And if it's dangerous, should the inotify system call fail when trying to
set the watch?  Bailout with a -EBADIDEA or something?


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