From: "Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: "Eric W. Biederman"
<ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>,
Linux Containers
<containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>
Cc: Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
Seth Forshee
<seth.forshee-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>,
Nikolay Borisov <kernel-6AxghH7DbtA@public.gmane.org>,
mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Jann Horn <jann-XZ1E9jl8jIdeoWH0uzbU5w@public.gmane.org>
Subject: Re: [PATCH v2 00/10] userns: sysctl limits for namespaces
Date: Tue, 26 Jul 2016 12:30:10 +0200 [thread overview]
Message-ID: <6be70177-a81d-7ed8-d2c9-a596d4d6a165@gmail.com> (raw)
In-Reply-To: <87d1m754jc.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
Hello Eric,
I realized I had a question after the last mail.
On 07/21/2016 06:39 PM, Eric W. Biederman wrote:
>
> This patchset addresses two use cases:
> - Implement a sane upper bound on the number of namespaces.
> - Provide a way for sandboxes to limit the attack surface from
> namespaces.
Can you say more about the second point? What exactly is the
problem that is being addressed, and how does the patch series
address it? (It would be good to have those details in the
revised commit message...)
Cheers,
Michael
WARNING: multiple messages have this Message-ID (diff)
From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>,
Linux Containers <containers@lists.linux-foundation.org>
Cc: mtk.manpages@gmail.com, Andy Lutomirski <luto@amacapital.net>,
Jann Horn <jann@thejh.net>, Kees Cook <keescook@chromium.org>,
Nikolay Borisov <kernel@kyup.com>,
"Serge E. Hallyn" <serge@hallyn.com>,
Seth Forshee <seth.forshee@canonical.com>,
linux-fsdevel@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-api@vger.kernel.org
Subject: Re: [PATCH v2 00/10] userns: sysctl limits for namespaces
Date: Tue, 26 Jul 2016 12:30:10 +0200 [thread overview]
Message-ID: <6be70177-a81d-7ed8-d2c9-a596d4d6a165@gmail.com> (raw)
In-Reply-To: <87d1m754jc.fsf@x220.int.ebiederm.org>
Hello Eric,
I realized I had a question after the last mail.
On 07/21/2016 06:39 PM, Eric W. Biederman wrote:
>
> This patchset addresses two use cases:
> - Implement a sane upper bound on the number of namespaces.
> - Provide a way for sandboxes to limit the attack surface from
> namespaces.
Can you say more about the second point? What exactly is the
problem that is being addressed, and how does the patch series
address it? (It would be good to have those details in the
revised commit message...)
Cheers,
Michael
next prev parent reply other threads:[~2016-07-26 10:30 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-20 1:13 [PATCH 0/10] userns: sysctl limits for namespaces Eric W. Biederman
[not found] ` <8737n5dscy.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-20 1:21 ` [PATCH 01/10] sysctl: Stop implicitly passing current into sysctl_table_root.lookup Eric W. Biederman
[not found] ` <20160720012138.7894-1-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-20 1:21 ` [PATCH 02/10] userns: Add per user namespace sysctls Eric W. Biederman
[not found] ` <20160720012138.7894-2-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-20 5:12 ` Serge E. Hallyn
[not found] ` <20160720051226.GC16885-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2016-07-20 15:55 ` Eric W. Biederman
[not found] ` <87shv49ud0.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-20 16:43 ` Serge E. Hallyn
[not found] ` <20160720164347.GA24378-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2016-07-21 14:41 ` Eric W. Biederman
[not found] ` <87invz9hpz.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-21 15:07 ` Serge E. Hallyn
2016-07-20 6:28 ` Nikolay Borisov
[not found] ` <578F1A00.6030701-6AxghH7DbtA@public.gmane.org>
2016-07-21 15:37 ` Eric W. Biederman
2016-07-20 1:21 ` [PATCH 03/10] userns: Add a limit on the number of user namespaces Eric W. Biederman
[not found] ` <20160720012138.7894-3-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-20 7:03 ` Nikolay Borisov
[not found] ` <578F2233.2040708-6AxghH7DbtA@public.gmane.org>
2016-07-21 15:23 ` Eric W. Biederman
2016-07-20 1:21 ` [PATCH 04/10] userns: Generalize the user namespace count into ucount Eric W. Biederman
2016-07-20 1:21 ` [PATCH 05/10] pidns: Add a limit on the number of pid namespaces Eric W. Biederman
2016-07-20 1:21 ` [PATCH 06/10] utsns: Add a limit on the number of uts namespaces Eric W. Biederman
2016-07-20 1:21 ` [PATCH 07/10] ipcns: Add a limit on the number of ipc namespaces Eric W. Biederman
2016-07-20 1:21 ` [PATCH 08/10] cgroupns: Add a limit on the number of cgroup namespaces Eric W. Biederman
2016-07-20 1:21 ` [PATCH 09/10] netns: Add a limit on the number of net namespaces Eric W. Biederman
2016-07-20 1:21 ` [PATCH 10/10] mntns: Add a limit on the number of mount namespaces Eric W. Biederman
2016-07-20 1:58 ` [PATCH 01/10] sysctl: Stop implicitly passing current into sysctl_table_root.lookup Eric W. Biederman
2016-07-20 5:06 ` Serge E. Hallyn
2016-07-20 4:02 ` [PATCH 0/10] userns: sysctl limits for namespaces Kees Cook
[not found] ` <CAGXu5jKWjHKxtPSGuogjR+XE+SbNWiUp2bOxugpD+hUex9QeZA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-21 14:49 ` Eric W. Biederman
2016-07-21 16:58 ` Eric W. Biederman
[not found] ` <871t2n53o5.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-21 18:46 ` Kees Cook
2016-07-21 16:39 ` [PATCH v2 00/10] " Eric W. Biederman
2016-07-21 16:39 ` Eric W. Biederman
2016-07-22 13:33 ` Colin Walters
[not found] ` <1469194399.3817016.673814953.7581706C-2RFepEojUI2N1INw9kWLP6GC3tUn3ZHUQQ4Iyu8u01E@public.gmane.org>
2016-07-22 18:45 ` Eric W. Biederman
2016-07-22 18:45 ` Eric W. Biederman
2016-07-22 21:46 ` Kees Cook
2016-07-23 2:11 ` Eric W. Biederman
2016-07-23 2:11 ` Eric W. Biederman
2016-07-23 2:11 ` Eric W. Biederman
[not found] ` <CAGXu5j+X7eWggkwpBpABsFe4hqK5LN1mYJ2TH91qj3iSe6rtcQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-23 2:11 ` Eric W. Biederman
[not found] ` <87poq5y0jw.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-22 21:46 ` Kees Cook
[not found] ` <87d1m754jc.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-21 16:40 ` [PATCH v2 01/10] sysctl: Stop implicitly passing current into sysctl_table_root.lookup Eric W. Biederman
2016-07-21 16:40 ` Eric W. Biederman
2016-07-21 16:40 ` [PATCH v2 04/10] userns: Generalize the user namespace count into ucount Eric W. Biederman
[not found] ` <20160721164014.17534-4-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-25 23:09 ` Serge E. Hallyn
2016-07-25 23:09 ` Serge E. Hallyn
2016-07-25 23:09 ` Serge E. Hallyn
2016-07-21 16:40 ` [PATCH v2 06/10] utsns: Add a limit on the number of uts namespaces Eric W. Biederman
[not found] ` <20160721164014.17534-6-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-25 23:09 ` Serge E. Hallyn
2016-07-25 23:09 ` Serge E. Hallyn
[not found] ` <20160721164014.17534-1-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-21 16:40 ` [PATCH v2 02/10] userns: Add per user namespace sysctls Eric W. Biederman
2016-07-21 16:40 ` Eric W. Biederman
[not found] ` <20160721164014.17534-2-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-26 0:02 ` Eric W. Biederman
2016-07-26 0:02 ` Eric W. Biederman
[not found] ` <878twp6zd2.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-26 0:24 ` David Miller
2016-07-26 0:24 ` David Miller
[not found] ` <20160725.172406.352408511647766870.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2016-07-26 0:44 ` Eric W. Biederman
2016-07-26 0:44 ` Eric W. Biederman
[not found] ` <87k2g95it9.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-26 2:58 ` David Miller
2016-07-26 2:58 ` David Miller
[not found] ` <20160725.195836.1881375122073635224.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2016-07-26 4:00 ` Eric W. Biederman
2016-07-26 4:00 ` Eric W. Biederman
2016-07-26 4:00 ` Eric W. Biederman
2016-07-21 16:40 ` [PATCH v2 03/10] userns: Add a limit on the number of user namespaces Eric W. Biederman
2016-07-21 16:40 ` Eric W. Biederman
[not found] ` <20160721164014.17534-3-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-25 23:05 ` Serge E. Hallyn
2016-07-25 23:05 ` Serge E. Hallyn
2016-07-21 16:40 ` [PATCH v2 04/10] userns: Generalize the user namespace count into ucount Eric W. Biederman
2016-07-21 16:40 ` [PATCH v2 05/10] pidns: Add a limit on the number of pid namespaces Eric W. Biederman
2016-07-21 16:40 ` Eric W. Biederman
[not found] ` <20160721164014.17534-5-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-25 23:09 ` Serge E. Hallyn
2016-07-25 23:09 ` Serge E. Hallyn
2016-07-21 16:40 ` [PATCH v2 06/10] utsns: Add a limit on the number of uts namespaces Eric W. Biederman
2016-07-21 16:40 ` [PATCH v2 07/10] ipcns: Add a limit on the number of ipc namespaces Eric W. Biederman
2016-07-21 16:40 ` Eric W. Biederman
2016-07-25 23:10 ` Serge E. Hallyn
[not found] ` <20160721164014.17534-7-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-25 23:10 ` Serge E. Hallyn
2016-07-21 16:40 ` [PATCH v2 08/10] cgroupns: Add a limit on the number of cgroup namespaces Eric W. Biederman
2016-07-21 16:40 ` Eric W. Biederman
2016-07-25 23:12 ` Serge E. Hallyn
2016-07-25 23:12 ` Serge E. Hallyn
[not found] ` <20160721164014.17534-8-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-25 23:12 ` Serge E. Hallyn
2016-07-21 16:40 ` [PATCH v2 09/10] netns: Add a limit on the number of net namespaces Eric W. Biederman
2016-07-21 16:40 ` Eric W. Biederman
2016-07-25 23:13 ` Serge E. Hallyn
[not found] ` <20160721164014.17534-9-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-25 23:13 ` Serge E. Hallyn
2016-07-26 6:01 ` Andrei Vagin
2016-07-26 6:01 ` Andrei Vagin
[not found] ` <CANaxB-zfkvu9XYkuYB47tYFGLeVnWBhpgEUaSrGD4+-O8ThcNw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-26 20:00 ` Eric W. Biederman
2016-07-26 20:00 ` Eric W. Biederman
2016-07-21 16:40 ` [PATCH v2 10/10] mntns: Add a limit on the number of mount namespaces Eric W. Biederman
2016-07-21 16:40 ` Eric W. Biederman
[not found] ` <20160721164014.17534-10-ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2016-07-25 23:15 ` Serge E. Hallyn
2016-07-25 23:15 ` Serge E. Hallyn
2016-07-22 13:33 ` [PATCH v2 00/10] userns: sysctl limits for namespaces Colin Walters
2016-07-26 10:27 ` Michael Kerrisk (man-pages)
2016-07-26 10:27 ` Michael Kerrisk (man-pages)
[not found] ` <94b608ae-1d06-5c41-cbd5-94e663a2163a-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-07-26 15:14 ` Eric W. Biederman
2016-07-26 15:14 ` Eric W. Biederman
2016-07-26 15:14 ` Eric W. Biederman
2016-07-26 10:30 ` Michael Kerrisk (man-pages) [this message]
2016-07-26 10:30 ` Michael Kerrisk (man-pages)
[not found] ` <6be70177-a81d-7ed8-d2c9-a596d4d6a165-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-07-26 15:06 ` Eric W. Biederman
2016-07-26 15:06 ` Eric W. Biederman
2016-07-26 15:06 ` Eric W. Biederman
2016-07-26 15:06 ` Eric W. Biederman
2016-07-26 16:52 ` Kees Cook
2016-07-26 16:52 ` Kees Cook
[not found] ` <CAGXu5j+ZtZAFpW0ajnnBTRZk17ez6XYF=meEJY_rF7wwgyZB5Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-26 17:29 ` Michael Kerrisk (man-pages)
2016-07-26 17:29 ` Michael Kerrisk (man-pages)
2016-07-26 17:29 ` Michael Kerrisk (man-pages)
[not found] ` <CAKgNAkhCvb-WkBbwebbBw6cfhg0FJ-SSbvK=aS1WK+BQ55eO5Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-26 20:44 ` Kees Cook
2016-07-26 20:44 ` Kees Cook
[not found] ` <87shuwtp4c.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-26 16:52 ` Kees Cook
2016-08-08 21:16 ` Eric W. Biederman
2016-08-08 21:16 ` Eric W. Biederman
2016-08-08 21:16 ` Eric W. Biederman
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