From: Johannes Berg <johannes@sipsolutions.net>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org, nstange@suse.de,
ap420073@gmail.com, David.Laight@aculab.com,
netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
rafael@kernel.org
Subject: Re: [CRAZY-RFF] debugfs: track open files and release on remove
Date: Fri, 09 Oct 2020 10:48:09 +0200 [thread overview]
Message-ID: <01fcaf4985f57d97ac03fc0b7deb2c225a2fbca1.camel@sipsolutions.net> (raw)
In-Reply-To: <20201009084729.GA406522@kroah.com>
On Fri, 2020-10-09 at 10:47 +0200, Greg KH wrote:
> > I think adding the .owner everywhere would be good, and perhaps we can
> > somehow put a check somewhere like
> >
> > WARN_ON(is_module_address((unsigned long)fops) && !fops->owner);
> >
> > to prevent the issue in the future?
>
> That will fail for all of the debugfs_create_* operations, as there is
> only one set of file operations for all of the different files created
> with these calls.
Why would it fail? Those have their fops in the core debugfs code, which
might have a .owner assigned but is probably built-in anyway?
> Which, now that I remember it, is why we went down the proxy "solution"
> in the first place :(
Not sure I understand. That was related more to (arbitrary) files having
to be disappeared rather than anything else?
johannes
next prev parent reply other threads:[~2020-10-09 8:48 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-08 15:48 [PATCH net 000/117] net: avoid to remove module when its debugfs is being used Taehee Yoo
2020-10-08 15:59 ` David Laight
2020-10-08 16:14 ` Johannes Berg
2020-10-08 16:37 ` Taehee Yoo
2020-10-09 5:38 ` Nicolai Stange
2020-10-09 10:07 ` Taehee Yoo
2020-10-09 5:09 ` Nicolai Stange
2020-10-09 7:45 ` Johannes Berg
2020-10-09 10:15 ` Taehee Yoo
2020-10-09 10:21 ` Johannes Berg
2020-10-09 10:41 ` [RFC] debugfs: protect against rmmod while files are open Johannes Berg
2020-10-09 10:48 ` Johannes Berg
2020-10-09 10:56 ` David Laight
2020-10-09 10:56 ` Johannes Berg
2020-10-09 11:15 ` gregkh
2020-10-09 15:33 ` [PATCH net 000/117] net: avoid to remove module when its debugfs is being used Steve deRosier
2020-10-09 7:53 ` [CRAZY-RFF] debugfs: track open files and release on remove Johannes Berg
2020-10-09 8:03 ` Greg KH
2020-10-09 8:06 ` Johannes Berg
2020-10-09 8:16 ` Greg KH
2020-10-09 8:19 ` Johannes Berg
2020-10-09 8:34 ` David Laight
2020-10-09 8:44 ` Johannes Berg
2020-10-09 9:00 ` David Laight
2020-10-09 8:47 ` Greg KH
2020-10-09 8:48 ` Johannes Berg [this message]
2020-10-10 9:38 ` Greg KH
2020-10-10 10:47 ` Johannes Berg
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