From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman)
To: Alan Cox <alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>
Cc: Aristeu Rozanski <aris-moeOTchvdi7YtjvyW6yDsg@public.gmane.org>,
Neil Horman <nhorman-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org>,
containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>,
Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>,
"Aneesh Kumar K.V"
<aneesh.kumar-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Arnaldo Carvalho de Melo
<acme-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
Thomas Graf <tgraf-G/eBtMaohhA@public.gmane.org>,
"Serge E. Hallyn" <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>,
Paul Turner <pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: Controlling devices and device namespaces
Date: Sun, 16 Sep 2012 05:17:44 -0700 [thread overview]
Message-ID: <87d31mupp3.fsf@xmission.com> (raw)
In-Reply-To: <87sjaiuqp5.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org> (Eric W. Biederman's message of "Sun, 16 Sep 2012 04:56:06 -0700")
ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman) writes:
> Alan Cox <alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org> writes:
>
>>> One piece of the puzzle is that we should be able to allow unprivileged
>>> device node creation and access for any device on any filesystem
>>> for which it unprivileged access is safe.
>>
>> Which devices are "safe" is policy for all interesting and useful cases,
>> as are file permissions, security tags, chroot considerations and the
>> like.
>>
>> It's a complete non starter.
Come to think of it mknod is completely unnecessary.
Without mknod. Without being able to mount filesystems containing
device nodes. The mount namespace is sufficient to prevent all of the
cases that the device control group prevents (open and mknod on device
nodes).
So I honestly think the device control group is superflous, and it is
probably wise to deprecate it and move to a model where it does not
exist.
Eric
WARNING: multiple messages have this Message-ID (diff)
From: ebiederm@xmission.com (Eric W. Biederman)
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Serge E. Hallyn" <serge@hallyn.com>,
Aristeu Rozanski <aris@ruivo.org>,
Neil Horman <nhorman@tuxdriver.com>,
"Serge E. Hallyn" <serue@us.ibm.com>,
containers@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, Michal Hocko <mhocko@suse.cz>,
Thomas Graf <tgraf@suug.ch>, Paul Mackerras <paulus@samba.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Johannes Weiner <hannes@cmpxchg.org>, Tejun Heo <tj@kernel.org>,
cgroups@vger.kernel.org, Paul Turner <pjt@google.com>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: Controlling devices and device namespaces
Date: Sun, 16 Sep 2012 05:17:44 -0700 [thread overview]
Message-ID: <87d31mupp3.fsf@xmission.com> (raw)
In-Reply-To: <87sjaiuqp5.fsf@xmission.com> (Eric W. Biederman's message of "Sun, 16 Sep 2012 04:56:06 -0700")
ebiederm@xmission.com (Eric W. Biederman) writes:
> Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
>
>>> One piece of the puzzle is that we should be able to allow unprivileged
>>> device node creation and access for any device on any filesystem
>>> for which it unprivileged access is safe.
>>
>> Which devices are "safe" is policy for all interesting and useful cases,
>> as are file permissions, security tags, chroot considerations and the
>> like.
>>
>> It's a complete non starter.
Come to think of it mknod is completely unnecessary.
Without mknod. Without being able to mount filesystems containing
device nodes. The mount namespace is sufficient to prevent all of the
cases that the device control group prevents (open and mknod on device
nodes).
So I honestly think the device control group is superflous, and it is
probably wise to deprecate it and move to a model where it does not
exist.
Eric
next prev parent reply other threads:[~2012-09-16 12:17 UTC|newest]
Thread overview: 163+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-13 20:58 [RFC] cgroup TODOs Tejun Heo
2012-09-13 20:58 ` Tejun Heo
[not found] ` <20120913205827.GO7677-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-14 8:16 ` Glauber Costa
[not found] ` <5052E7DF.7040000-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-09-14 9:12 ` Li Zefan
2012-09-14 9:12 ` Li Zefan
[not found] ` <5052F4FF.6070508-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2012-09-14 11:22 ` Peter Zijlstra
2012-09-14 11:22 ` Peter Zijlstra
2012-09-14 17:59 ` Tejun Heo
2012-09-14 17:59 ` Tejun Heo
[not found] ` <20120914175944.GF17747-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-14 18:23 ` Peter Zijlstra
2012-09-14 18:23 ` Peter Zijlstra
2012-09-14 18:33 ` Tejun Heo
2012-09-14 18:33 ` Tejun Heo
2012-09-14 17:43 ` Tejun Heo
2012-09-14 17:43 ` Tejun Heo
[not found] ` <20120914174329.GD17747-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-17 8:50 ` Glauber Costa
2012-09-17 8:50 ` Glauber Costa
[not found] ` <5056E467.2090108-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-09-17 17:21 ` Tejun Heo
2012-09-17 17:21 ` Tejun Heo
[not found] ` <20120917172123.GB18677-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-18 8:16 ` Glauber Costa
2012-09-17 8:50 ` Glauber Costa
2012-09-14 9:04 ` Mike Galbraith
2012-09-14 9:04 ` Mike Galbraith
2012-09-14 9:04 ` Mike Galbraith
[not found] ` <1347613484.4340.132.camel-YqMYhexLQo31wTEvPJ5Q0F6hYfS7NtTn@public.gmane.org>
2012-09-14 17:17 ` Tejun Heo
2012-09-14 17:17 ` Tejun Heo
2012-09-14 9:10 ` Daniel P. Berrange
2012-09-14 9:10 ` Daniel P. Berrange
[not found] ` <20120914091032.GA6819-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-09-14 9:08 ` Glauber Costa
2012-09-14 13:58 ` Vivek Goyal
2012-09-14 13:58 ` Vivek Goyal
[not found] ` <20120914135830.GB6221-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-09-14 19:29 ` Tejun Heo
2012-09-14 19:29 ` Tejun Heo
[not found] ` <20120914192935.GO17747-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-14 21:51 ` Kay Sievers
2012-09-14 21:51 ` Kay Sievers
2012-09-14 11:15 ` Peter Zijlstra
2012-09-14 14:25 ` Vivek Goyal
2012-09-14 14:25 ` Vivek Goyal
[not found] ` <20120914142539.GC6221-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-09-14 14:53 ` Peter Zijlstra
2012-09-14 14:53 ` Peter Zijlstra
2012-09-14 15:14 ` Vivek Goyal
2012-09-14 15:14 ` Vivek Goyal
[not found] ` <20120914151447.GD6221-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-09-14 21:57 ` Tejun Heo
2012-09-14 21:57 ` Tejun Heo
[not found] ` <20120914215701.GW17747-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-17 15:27 ` Vivek Goyal
2012-09-17 15:27 ` Vivek Goyal
2012-09-18 18:08 ` Vivek Goyal
2012-09-18 18:08 ` Vivek Goyal
2012-09-17 8:55 ` Glauber Costa
2012-09-14 21:39 ` Tejun Heo
2012-09-14 21:39 ` Tejun Heo
[not found] ` <20120914213938.GV17747-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-17 15:05 ` Vivek Goyal
2012-09-17 15:05 ` Vivek Goyal
[not found] ` <20120917150518.GB5094-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-09-17 16:40 ` Tejun Heo
2012-09-17 16:40 ` Tejun Heo
2012-09-14 15:03 ` Michal Hocko
2012-09-14 15:03 ` Michal Hocko
2012-09-14 15:03 ` Michal Hocko
[not found] ` <20120914150306.GQ28039-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-19 14:02 ` Michal Hocko
2012-09-19 14:02 ` Michal Hocko
2012-09-19 14:02 ` Michal Hocko
[not found] ` <20120919140203.GA5398-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-19 14:03 ` [PATCH 2.6.32] memcg: warn on deeper hierarchies with use_hierarchy==0 Michal Hocko
2012-09-19 14:03 ` Michal Hocko
[not found] ` <20120919140308.GB5398-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-19 19:38 ` David Rientjes
2012-09-19 19:38 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1209191237020.749-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-09-20 13:24 ` Michal Hocko
2012-09-20 13:24 ` Michal Hocko
2012-09-20 13:24 ` Michal Hocko
[not found] ` <20120920132400.GC23872-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-20 22:33 ` David Rientjes
2012-09-20 22:33 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1209201531250.17455-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-09-21 7:16 ` Michal Hocko
2012-09-21 7:16 ` Michal Hocko
2012-09-21 7:16 ` Michal Hocko
2012-09-19 14:03 ` [PATCH 3.0] " Michal Hocko
2012-09-19 14:03 ` Michal Hocko
2012-09-19 14:05 ` [PATCH 3.2+] " Michal Hocko
2012-09-19 14:05 ` Michal Hocko
2012-09-19 14:05 ` Michal Hocko
2012-09-14 18:07 ` [RFC] cgroup TODOs Vivek Goyal
2012-09-14 18:07 ` Vivek Goyal
[not found] ` <20120914180754.GF6221-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-09-14 18:53 ` Tejun Heo
2012-09-14 18:53 ` Tejun Heo
[not found] ` <20120914185324.GI17747-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-14 19:28 ` Vivek Goyal
2012-09-14 19:28 ` Vivek Goyal
[not found] ` <20120914192840.GG6221-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-09-14 19:44 ` Tejun Heo
2012-09-14 19:44 ` Tejun Heo
[not found] ` <20120914194439.GP17747-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-14 19:49 ` Tejun Heo
2012-09-14 19:49 ` Tejun Heo
[not found] ` <20120914194950.GQ17747-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-14 20:39 ` Tejun Heo
2012-09-14 20:39 ` Tejun Heo
2012-09-14 20:39 ` Tejun Heo
[not found] ` <20120914203925.GR17747-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-17 8:40 ` Glauber Costa
2012-09-17 8:40 ` Glauber Costa
[not found] ` <5056E1FC.1090508-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-09-17 17:30 ` Tejun Heo
2012-09-17 17:30 ` Tejun Heo
2012-09-17 14:37 ` Vivek Goyal
2012-09-17 14:37 ` Vivek Goyal
2012-09-14 19:44 ` Tejun Heo
2012-09-14 18:36 ` Aristeu Rozanski
2012-09-14 18:36 ` Aristeu Rozanski
[not found] ` <20120914183641.GA2191-YqEmrenMroyQb786VAuzj9i2O/JbrIOy@public.gmane.org>
2012-09-14 18:54 ` Tejun Heo
2012-09-14 18:54 ` Tejun Heo
2012-09-15 2:20 ` Serge E. Hallyn
2012-09-15 2:20 ` Serge E. Hallyn
[not found] ` <20120915022037.GA6438-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2012-09-15 9:27 ` Controlling devices and device namespaces Eric W. Biederman
2012-09-15 9:27 ` Eric W. Biederman
[not found] ` <87wqzv7i08.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2012-09-15 22:05 ` Serge E. Hallyn
2012-09-15 22:05 ` Serge E. Hallyn
[not found] ` <20120915220520.GA11364-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2012-09-16 0:24 ` Eric W. Biederman
2012-09-16 0:24 ` Eric W. Biederman
[not found] ` <87y5kazuez.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2012-09-16 3:31 ` Serge E. Hallyn
2012-09-16 3:31 ` Serge E. Hallyn
2012-09-16 11:21 ` Alan Cox
2012-09-16 11:21 ` Alan Cox
[not found] ` <20120916122112.3f16178d-38n7/U1jhRXW96NNrWNlrekiAK3p4hvP@public.gmane.org>
2012-09-16 11:56 ` Eric W. Biederman
2012-09-16 11:56 ` Eric W. Biederman
[not found] ` <87sjaiuqp5.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2012-09-16 12:17 ` Eric W. Biederman [this message]
2012-09-16 12:17 ` Eric W. Biederman
[not found] ` <87d31mupp3.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2012-09-16 13:32 ` Serge Hallyn
2012-09-16 13:32 ` Serge Hallyn
[not found] ` <5055D4D1.3070407-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>
2012-09-16 14:23 ` Eric W. Biederman
2012-09-16 14:23 ` Eric W. Biederman
[not found] ` <87k3vuqc5l.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2012-09-16 16:13 ` Alan Cox
2012-09-16 16:13 ` Alan Cox
[not found] ` <20120916171316.517ad0fd-38n7/U1jhRXW96NNrWNlrekiAK3p4hvP@public.gmane.org>
2012-09-16 17:49 ` Eric W. Biederman
2012-09-16 17:49 ` Eric W. Biederman
2012-09-16 16:15 ` Serge Hallyn
2012-09-16 16:15 ` Serge Hallyn
[not found] ` <5055FB2A.1020103-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>
2012-09-16 16:53 ` Eric W. Biederman
2012-09-16 16:53 ` Eric W. Biederman
2012-09-16 8:19 ` [RFC] cgroup TODOs James Bottomley
2012-09-16 8:19 ` James Bottomley
2012-09-16 8:19 ` James Bottomley
[not found] ` <1347783557.2463.1.camel-sFMDBYUN5F8GjUHQrlYNx2Wm91YjaHnnhRte9Li2A+AAvxtiuMwx3w@public.gmane.org>
2012-09-16 14:41 ` Eric W. Biederman
2012-09-16 14:41 ` Eric W. Biederman
2012-09-16 14:41 ` Eric W. Biederman
2012-09-17 13:21 ` Aristeu Rozanski
2012-09-17 13:21 ` Aristeu Rozanski
2012-09-14 18:36 ` Aristeu Rozanski
2012-09-14 22:03 ` Dhaval Giani
2012-09-14 22:03 ` Dhaval Giani
2012-09-14 22:03 ` Dhaval Giani
[not found] ` <CAPhKKr8wDLrcWHLTRq1M7gU_6CGNxzzF83zJo2WZ5vrY7h8Qyw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-09-14 22:06 ` Tejun Heo
2012-09-14 22:06 ` Tejun Heo
2012-09-20 1:33 ` Andy Lutomirski
2012-09-20 1:33 ` Andy Lutomirski
2012-09-20 1:33 ` Andy Lutomirski
[not found] ` <505A725B.2080901-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
2012-09-20 18:26 ` Tejun Heo
2012-09-20 18:26 ` Tejun Heo
[not found] ` <20120920182651.GH28934-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 18:39 ` Andy Lutomirski
2012-09-20 18:39 ` Andy Lutomirski
2012-09-20 18:39 ` Andy Lutomirski
2012-09-20 18:26 ` Tejun Heo
2012-09-21 21:40 ` Tejun Heo
2012-09-21 21:40 ` Tejun Heo
2012-09-21 21:40 ` Tejun Heo
2012-09-14 11:15 ` Peter Zijlstra
2012-09-14 12:54 ` Daniel P. Berrange
2012-09-14 12:54 ` Daniel P. Berrange
[not found] ` <20120914125427.GW6819-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-09-14 8:55 ` Glauber Costa
2012-09-14 17:53 ` Tejun Heo
2012-09-14 17:53 ` Tejun Heo
2012-09-14 17:53 ` Tejun Heo
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