From: Andrew Lutomirski <luto@mit.edu>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: linux-kernel@vger.kernel.org,
Linux Containers <containers@lists.osdl.org>,
netdev@vger.kernel.org, netfilter-devel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, jamal <hadi@cyberus.ca>,
Daniel Lezcano <daniel.lezcano@free.fr>,
Linus Torvalds <torvalds@linux-foundation.org>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Ulrich Drepper <drepper@gmail.com>,
Al Viro <viro@ZenIV.linux.org.uk>,
David Miller <davem@davemloft.net>,
"Serge E. Hallyn" <serge@hallyn.com>,
Pavel Emelyanov <xemul@openvz.org>,
Pavel Emelyanov <xemul@parallels.com>,
Ben Greear <greearb@candelatech.com>,
Matt Helsley <matthltc@us.ibm.com>,
Jonathan Corbet <corbet@lwn.net>,
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
Jan Engelhardt <jengelh@medozas.de>,
Patrick McHardy <kaber@trash.net>
Subject: Re: [ABI REVIEW][PATCH 0/8] Namespace file descriptors
Date: Fri, 24 Sep 2010 09:02:39 -0400 [thread overview]
Message-ID: <4C9CA16F.3000505@mit.edu> (raw)
In-Reply-To: <m1ocborgq7.fsf@fess.ebiederm.org>
Eric W. Biederman wrote:
> Introduce file for manipulating namespaces and related syscalls.
> files:
> /proc/self/ns/<nstype>
>
> syscalls:
> int setns(unsigned long nstype, int fd);
> socketat(int nsfd, int family, int type, int protocol);
>
How does security work? Are there different kinds of fd that give (say) pin-the-namespace permission, socketat permission, and setns permission?
--Andy
> Netlink attribute:
> IFLA_NS_FD int fd.
>
> Name space file descriptors address three specific problems that
> can make namespaces hard to work with.
> - Namespaces require a dedicated process to pin them in memory.
> - It is not possible to use a namespace unless you are the child of the
> original creator.
> - Namespaces don't have names that userspace can use to talk about them.
>
> Opening of the /proc/self/ns/<nstype> files return a file descriptor
> that can be used to talk about a specific namespace, and to keep the
> specified namespace alive.
>
> /proc/self/ns/<nstype> can be bind mounted as:
> mount --bind /proc/self/ns/net /some/filesystem/path
> to keep the namespace alive as long as the mount exists.
>
> setns() as a companion to unshare allows changing the namespace
> of the current process, being able to unshare the namespace is
> a requirement.
>
> There are two primary envisioned uses for this functionality.
> o ``Entering'' an existing container.
> o Allowing multiple network namespaces to be in use at once on
> the same machine, without requiring elaborate infrastructure.
>
> Overall this received positive reviews on the containers list but this
> needs a wider review of the ABI as this is pretty fundamental kernel
> functionality.
>
>
> I have left out the pid namespaces bits for the moment because the pid
> namespace still needs work before it is safe to unshare, and my concern
> at the moment is ensuring the system calls seem reasonable.
>
> Eric W. Biederman (8):
> ns: proc files for namespace naming policy.
> ns: Introduce the setns syscall
> ns proc: Add support for the network namespace.
> ns proc: Add support for the uts namespace
> ns proc: Add support for the ipc namespace
> ns proc: Add support for the mount namespace
> net: Allow setting the network namespace by fd
> net: Implement socketat.
>
> ---
> fs/namespace.c | 57 +++++++++++++
> fs/proc/Makefile | 1 +
> fs/proc/base.c | 22 +++---
> fs/proc/inode.c | 7 ++
> fs/proc/internal.h | 18 ++++
> fs/proc/namespaces.c | 193 +++++++++++++++++++++++++++++++++++++++++++
> include/linux/if_link.h | 1 +
> include/linux/proc_fs.h | 20 +++++
> include/net/net_namespace.h | 1 +
> ipc/namespace.c | 31 +++++++
> kernel/nsproxy.c | 39 +++++++++
> kernel/utsname.c | 32 +++++++
> net/core/net_namespace.c | 56 +++++++++++++
> net/core/rtnetlink.c | 4 +-
> net/socket.c | 26 ++++++-
> 15 files changed, 494 insertions(+), 14 deletions(-)
>
next prev parent reply other threads:[~2010-09-24 13:02 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-23 8:45 [ABI REVIEW][PATCH 0/8] Namespace file descriptors Eric W. Biederman
2010-09-23 8:46 ` [PATCH 1/8] ns: proc files for namespace naming policy Eric W. Biederman
2010-09-23 8:46 ` [PATCH 2/8] ns: Introduce the setns syscall Eric W. Biederman
2010-09-23 8:47 ` [PATCH 3/8] ns proc: Add support for the network namespace Eric W. Biederman
2010-09-23 11:27 ` Louis Rilling
2010-09-23 16:00 ` Eric W. Biederman
2010-09-23 8:48 ` [PATCH 4/8] ns proc: Add support for the uts namespace Eric W. Biederman
2010-09-23 8:49 ` [PATCH 5/8] ns proc: Add support for the ipc namespace Eric W. Biederman
2010-09-23 8:50 ` [PATCH 6/8] ns proc: Add support for the mount namespace Eric W. Biederman
2010-09-23 8:51 ` [PATCH 7/8] net: Allow setting the network namespace by fd Eric W. Biederman
2010-09-23 9:41 ` Eric Dumazet
2010-09-23 16:03 ` Eric W. Biederman
2010-09-23 11:22 ` jamal
2010-09-23 14:58 ` David Lamparter
2010-09-24 11:51 ` jamal
2010-09-24 12:57 ` David Lamparter
2010-09-24 13:32 ` jamal
2010-09-24 14:09 ` David Lamparter
2010-09-24 14:16 ` jamal
2010-09-23 15:14 ` Eric W. Biederman
2010-09-23 14:22 ` Brian Haley
2010-09-23 16:16 ` Eric W. Biederman
2010-09-24 13:46 ` Daniel Lezcano
2010-09-23 8:51 ` [PATCH 8/8] net: Implement socketat Eric W. Biederman
2010-09-23 8:56 ` Pavel Emelyanov
2010-09-23 11:19 ` jamal
2010-09-23 11:33 ` Pavel Emelyanov
2010-09-23 11:40 ` jamal
2010-09-23 11:53 ` Pavel Emelyanov
2010-09-23 12:11 ` jamal
2010-09-23 12:34 ` Pavel Emelyanov
2010-09-23 14:54 ` David Lamparter
2010-09-23 15:00 ` Eric W. Biederman
2010-10-02 21:13 ` Daniel Lezcano
2010-10-03 13:44 ` jamal
2010-10-04 10:13 ` Daniel Lezcano
2010-10-04 19:07 ` Eric W. Biederman
2010-10-15 12:30 ` netns patches WAS( " jamal
2010-10-26 20:52 ` jamal
2010-10-27 0:27 ` Eric W. Biederman
2010-09-23 15:18 ` [ABI REVIEW][PATCH 0/8] Namespace file descriptors David Lamparter
2010-09-23 16:32 ` Eric W. Biederman
2010-09-23 16:49 ` David Lamparter
2010-09-24 13:02 ` Andrew Lutomirski [this message]
2010-09-24 13:49 ` Daniel Lezcano
2010-09-24 17:06 ` Eric W. Biederman
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