From: David Howells <dhowells@redhat.com>
To: ebiederm@xmission.com (Eric W. Biederman)
Cc: dhowells@redhat.com, "Serge E. Hallyn" <serge@hallyn.com>,
LSM <linux-security-module@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>, James Morris <jmorris@namei.org>,
Kees Cook <kees.cook@canonical.com>,
containers@lists.linux-foundation.org,
kernel list <linux-kernel@vger.kernel.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
xemul@parallels.com
Subject: Re: [PATCH 1/9] Add a user_namespace as creator/owner of uts_namespace
Date: Wed, 23 Feb 2011 23:19:08 +0000 [thread overview]
Message-ID: <8559.1298503148@redhat.com> (raw)
In-Reply-To: <m1lj16ih0n.fsf@fess.ebiederm.org>
Eric W. Biederman <ebiederm@xmission.com> wrote:
> > Which means that unless the uts_namespace belongs to our user_namespace, we
> > cannot change it. Is that correct?
>
> No. If you are root in a parent namespace you can also change it.
But surely, by definition, if you're a user in this namespace, you can't also
be root in a parent namespace...
For the case I worked through current_user() is a member of current_user_ns()
and can't also be a member of its parent, grandparent, etc. - or can it?
David
next prev parent reply other threads:[~2011-02-23 23:19 UTC|newest]
Thread overview: 135+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-17 15:02 userns: targeted capabilities v5 Serge E. Hallyn
2011-02-17 15:02 ` [PATCH 1/9] Add a user_namespace as creator/owner of uts_namespace Serge E. Hallyn
2011-02-18 3:31 ` Eric W. Biederman
[not found] ` <20110217150257.GA26395-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-18 3:31 ` Eric W. Biederman
2011-02-18 16:57 ` Daniel Lezcano
2011-02-18 23:59 ` Andrew Morton
2011-02-23 17:16 ` David Howells
2011-02-18 16:57 ` Daniel Lezcano
2011-02-18 23:59 ` Andrew Morton
2011-02-23 17:16 ` David Howells
[not found] ` <3139.1298481393-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-02-23 21:21 ` Eric W. Biederman
2011-02-23 21:21 ` Eric W. Biederman
2011-02-23 23:19 ` David Howells [this message]
2011-02-23 23:54 ` Eric W. Biederman
[not found] ` <8559.1298503148-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-02-23 23:54 ` Eric W. Biederman
[not found] ` <m1lj16ih0n.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2011-02-23 23:19 ` David Howells
2011-02-17 15:03 ` [PATCH 2/9] security: Make capabilities relative to the user namespace Serge E. Hallyn
2011-02-18 3:46 ` Eric W. Biederman
2011-02-18 23:44 ` Daniel Lezcano
[not found] ` <20110217150306.GB26395-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-18 3:46 ` Eric W. Biederman
2011-02-18 23:44 ` Daniel Lezcano
2011-02-18 23:59 ` Andrew Morton
2011-02-23 11:40 ` David Howells
2011-02-23 16:59 ` David Howells
2011-02-18 23:59 ` Andrew Morton
2011-02-23 11:40 ` David Howells
2011-02-23 12:01 ` David Howells
2011-02-23 13:43 ` Serge E. Hallyn
[not found] ` <29617.1298462517-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-02-23 13:43 ` Serge E. Hallyn
2011-02-23 16:59 ` David Howells
2011-02-17 15:03 ` [PATCH 3/9] allow sethostname in a container Serge E. Hallyn
2011-02-18 3:05 ` Eric W. Biederman
[not found] ` <20110217150316.GC26395-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-18 3:05 ` Eric W. Biederman
2011-02-18 23:46 ` Daniel Lezcano
2011-02-18 23:46 ` Daniel Lezcano
2011-02-17 15:03 ` [PATCH 4/9] allow killing tasks in your own or child userns Serge E. Hallyn
2011-02-18 3:00 ` Eric W. Biederman
[not found] ` <20110217150325.GD26395-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-18 3:00 ` Eric W. Biederman
2011-02-18 23:59 ` Andrew Morton
2011-02-19 10:55 ` Daniel Lezcano
2011-02-19 10:55 ` Daniel Lezcano
2011-02-18 23:59 ` Andrew Morton
2011-02-24 0:48 ` Serge E. Hallyn
[not found] ` <20110224004818.GA11822-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-24 0:54 ` Andrew Morton
2011-02-24 0:54 ` Andrew Morton
[not found] ` <20110218155921.440f1137.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2011-02-24 0:48 ` Serge E. Hallyn
2011-02-17 15:03 ` [PATCH 5/9] Allow ptrace from non-init user namespaces Serge E. Hallyn
2011-02-18 2:59 ` Eric W. Biederman
[not found] ` <m1aahu9hea.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2011-02-18 4:36 ` Serge E. Hallyn
2011-02-18 4:36 ` Serge E. Hallyn
[not found] ` <20110218043601.GB9584-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-24 0:49 ` [PATCH] userns: ptrace: incorporate feedback from Eric Serge E. Hallyn
2011-02-24 0:49 ` Serge E. Hallyn
2011-02-24 0:56 ` Andrew Morton
2011-02-24 3:15 ` Serge E. Hallyn
[not found] ` <20110223165651.cf248f3b.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2011-02-24 3:15 ` Serge E. Hallyn
[not found] ` <20110224004901.GB11822-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-24 0:56 ` Andrew Morton
[not found] ` <20110217150333.GE26395-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-18 2:59 ` [PATCH 5/9] Allow ptrace from non-init user namespaces Eric W. Biederman
2011-02-18 23:59 ` Andrew Morton
2011-02-19 17:49 ` Daniel Lezcano
2011-02-23 17:05 ` David Howells
2011-02-23 17:11 ` David Howells
2011-02-18 23:59 ` Andrew Morton
2011-02-24 0:43 ` Serge E. Hallyn
[not found] ` <20110218155925.f7d30a52.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2011-02-24 0:43 ` Serge E. Hallyn
2011-02-19 17:49 ` Daniel Lezcano
2011-02-23 17:05 ` David Howells
2011-02-23 17:11 ` David Howells
2011-02-17 15:03 ` [PATCH 6/9] user namespaces: convert all capable checks in kernel/sys.c Serge E. Hallyn
2011-02-18 1:57 ` Eric W. Biederman
2011-02-18 23:59 ` Andrew Morton
2011-02-19 0:01 ` Andrew Morton
[not found] ` <20110217150342.GF26395-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-18 1:57 ` Eric W. Biederman
2011-02-18 23:59 ` Andrew Morton
2011-02-19 0:01 ` Andrew Morton
2011-02-19 17:52 ` Daniel Lezcano
2011-02-19 17:52 ` Daniel Lezcano
2011-02-17 15:03 ` [PATCH 7/9] add a user namespace owner of ipc ns Serge E. Hallyn
2011-02-18 3:19 ` Eric W. Biederman
2011-02-18 23:59 ` Andrew Morton
2011-02-19 17:57 ` Daniel Lezcano
[not found] ` <20110217150349.GG26395-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-18 3:19 ` Eric W. Biederman
2011-02-18 23:59 ` Andrew Morton
2011-02-19 17:57 ` Daniel Lezcano
2011-02-17 15:03 ` [PATCH 8/9] user namespaces: convert several capable() calls Serge E. Hallyn
2011-02-18 1:51 ` Eric W. Biederman
[not found] ` <20110217150356.GH26395-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-18 1:51 ` Eric W. Biederman
2011-02-19 19:07 ` Daniel Lezcano
2011-02-19 19:07 ` Daniel Lezcano
2011-02-17 15:04 ` [PATCH 9/9] userns: check user namespace for task->file uid equivalence checks Serge E. Hallyn
2011-02-18 1:29 ` Eric W. Biederman
2011-02-18 23:59 ` Andrew Morton
[not found] ` <20110218155935.66e7782d.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2011-02-24 3:24 ` Serge E. Hallyn
2011-02-24 3:24 ` Serge E. Hallyn
[not found] ` <20110224032415.GA5555-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-24 5:08 ` Andrew Morton
2011-02-24 5:08 ` Andrew Morton
2011-02-19 19:22 ` Daniel Lezcano
[not found] ` <20110217150406.GI26395-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-18 1:29 ` Eric W. Biederman
2011-02-18 23:59 ` Andrew Morton
2011-02-19 19:22 ` Daniel Lezcano
2011-02-18 0:21 ` userns: targeted capabilities v5 Andrew Morton
[not found] ` <20110217162146.1b8e45e0.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2011-02-18 3:53 ` Eric W. Biederman
2011-02-18 4:28 ` Serge E. Hallyn
2011-02-18 3:53 ` Eric W. Biederman
2011-02-18 4:28 ` Serge E. Hallyn
[not found] ` <20110217150224.GA26334-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-17 15:02 ` [PATCH 1/9] Add a user_namespace as creator/owner of uts_namespace Serge E. Hallyn
2011-02-17 15:03 ` [PATCH 2/9] security: Make capabilities relative to the user namespace Serge E. Hallyn
2011-02-17 15:03 ` [PATCH 3/9] allow sethostname in a container Serge E. Hallyn
2011-02-17 15:03 ` [PATCH 4/9] allow killing tasks in your own or child userns Serge E. Hallyn
2011-02-17 15:03 ` [PATCH 5/9] Allow ptrace from non-init user namespaces Serge E. Hallyn
2011-02-17 15:03 ` [PATCH 6/9] user namespaces: convert all capable checks in kernel/sys.c Serge E. Hallyn
2011-02-17 15:03 ` [PATCH 7/9] add a user namespace owner of ipc ns Serge E. Hallyn
2011-02-17 15:03 ` [PATCH 8/9] user namespaces: convert several capable() calls Serge E. Hallyn
2011-02-17 15:04 ` [PATCH 9/9] userns: check user namespace for task->file uid equivalence checks Serge E. Hallyn
2011-02-18 0:21 ` userns: targeted capabilities v5 Andrew Morton
2011-02-23 12:05 ` User namespaces and keys David Howells
[not found] ` <29256.1298461209-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-02-23 12:01 ` [PATCH 2/9] security: Make capabilities relative to the user namespace David Howells
2011-02-23 12:05 ` User namespaces and keys David Howells
[not found] ` <29677.1298462729-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-02-23 13:58 ` Serge E. Hallyn
2011-02-23 13:58 ` Serge E. Hallyn
2011-02-23 14:46 ` Eric W. Biederman
[not found] ` <20110223135814.GA1859-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-02-23 14:46 ` Eric W. Biederman
2011-02-23 15:06 ` David Howells
2011-02-23 15:06 ` David Howells
2011-02-23 15:45 ` Eric W. Biederman
[not found] ` <m162sasqj6.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2011-02-23 15:53 ` Serge E. Hallyn
2011-02-23 15:53 ` Serge E. Hallyn
[not found] ` <20110223155328.GA21266-BtbdaCaBcfOTUehee3IRJA@public.gmane.org>
2011-02-23 19:24 ` Casey Schaufler
2011-02-23 19:24 ` Casey Schaufler
[not found] ` <4D655EE4.6030707-iSGtlc1asvQWG2LlvL+J4A@public.gmane.org>
2011-02-23 20:55 ` Eric W. Biederman
2011-02-23 20:55 ` Eric W. Biederman
2011-02-23 21:37 ` Casey Schaufler
2011-02-24 6:56 ` Eric W. Biederman
[not found] ` <4D657E0C.3010102-iSGtlc1asvQWG2LlvL+J4A@public.gmane.org>
2011-02-24 6:56 ` Eric W. Biederman
[not found] ` <m1k4gqlbdm.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2011-02-23 21:37 ` Casey Schaufler
[not found] ` <890.1298473574-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-02-23 15:45 ` Eric W. Biederman
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