From: Serge Hallyn <serge.hallyn@canonical.com>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>,
LSM <linux-security-module@vger.kernel.org>,
James Morris <jmorris@namei.org>,
Kees Cook <kees.cook@canonical.com>,
containers@lists.linux-foundation.org,
kernel list <linux-kernel@vger.kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Michael Kerrisk <michael.kerrisk@gmail.com>
Subject: Re: [RFC 1/5] user namespaces: Add a user_namespace as creator/owner of uts_namespace
Date: Fri, 17 Dec 2010 10:12:00 -0600 [thread overview]
Message-ID: <20101217161200.GA5548@peq> (raw)
In-Reply-To: <AANLkTinPBAPjeEdhn21JN6zVpAKDHR9=3gszj84CyyNx@mail.gmail.com>
Quoting Alexey Dobriyan (adobriyan@gmail.com):
> On Fri, Dec 17, 2010 at 5:24 PM, Serge E. Hallyn <serge@hallyn.com> wrote:
> > +/*
> > + * userns count is 1 for root user, 1 for init_uts_ns,
> > + * and 1 for... ?
> > + */
> > struct user_namespace init_user_ns = {
> > .kref = {
> > - .refcount = ATOMIC_INIT(2),
> > + .refcount = ATOMIC_INIT(3),
>
> +1 is for init_nsproxy ;-)
Hmm, actually user_namespace isn't in struct nsproxy any more,
since 18b6e0414e42d95183f07d8177e3ff0241abd825.
I think my original thought was that init_user_ns is pinned twice by
root_user - once as creator and once as the root user in it. In
which case it isn't right - the user_ns pins the task which created
it, the creator does not pin the user_ns it creates.
-serge
next prev parent reply other threads:[~2010-12-17 16:12 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-17 15:22 [RFC 0/5] user namespaces: start clamping down Serge E. Hallyn
2010-12-17 15:24 ` [RFC 1/5] user namespaces: Add a user_namespace as creator/owner of uts_namespace Serge E. Hallyn
2010-12-17 15:25 ` [RFC 2/5] user namespaces: make capabilities relative to the user namespace Serge E. Hallyn
2010-12-17 15:26 ` [RFC 3/5] user namespaces: allow sethostname in a container Serge E. Hallyn
2010-12-17 15:26 ` [RFC 4/5] user namespaces: allow killing tasks in your own or child userns Serge E. Hallyn
2010-12-17 15:27 ` [RFC 5/5] user namespaces: Allow ptrace from non-init user namespaces Serge E. Hallyn
2010-12-17 19:45 ` Eric W. Biederman
2010-12-17 20:04 ` Serge Hallyn
2011-01-01 4:47 ` Serge E. Hallyn
2010-12-17 19:31 ` [RFC 4/5] user namespaces: allow killing tasks in your own or child userns Eric W. Biederman
2010-12-17 20:09 ` Serge E. Hallyn
2010-12-17 20:17 ` Eric W. Biederman
2010-12-17 20:22 ` Serge E. Hallyn
2011-01-01 4:45 ` Serge E. Hallyn
2011-01-01 23:10 ` Eric W. Biederman
2011-01-02 14:39 ` Serge E. Hallyn
2010-12-17 15:56 ` [RFC 1/5] user namespaces: Add a user_namespace as creator/owner of uts_namespace Alexey Dobriyan
2010-12-17 16:00 ` Alexey Dobriyan
2010-12-17 16:17 ` Serge Hallyn
2010-12-17 16:12 ` Serge Hallyn [this message]
2010-12-17 17:31 ` Greg KH
2010-12-17 19:26 ` Eric W. Biederman
2010-12-17 19:58 ` Greg KH
2010-12-17 20:40 ` Eric W. Biederman
2010-12-17 23:15 ` Greg KH
2010-12-18 6:32 ` Eric W. Biederman
2010-12-18 17:56 ` Greg KH
2010-12-17 19:46 ` Serge Hallyn
2010-12-17 19:57 ` Greg KH
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