linux-kernel - Re: [PATCH 11/11] sysfs: user namespaces: fix bug with clone(CLONE

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Message-ID: <m1wskd43uc.fsf@frodo.ebiederm.org>
Date:	Wed, 25 Jun 2008 14:11:39 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Tejun Heo <htejun@...il.com>,
	Benjamin Thery <benjamin.thery@...l.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [PATCH 11/11] sysfs: user namespaces: fix bug with clone(CLONE_NEWUSER) with fairsched

"Serge E. Hallyn" <serue@...ibm.com> writes:

> Except the sysfs mount holds no refcount on the userns.  So as long as we
> do the ida tagging as you suggested in your response to patch 6, there
> should be no reference to the user_ns left in sysfs code.
>
> The extra reference in patch #9 is for a light ref on the network
> namespace.  I'm still not sure that needs to be there, since if the
> network namespace goes away, it will properly unregister its sysfs
> mounts.  Eric, Benjamin, I really don't see any use for the hold_net()
> from sysfs.  What is it doing?

Mostly just being a sanity check.  We can remove that if it easier.

Eric
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