From: ebiederm@xmission•com (Eric W. Biederman)
To: Daniel Lezcano <daniel.lezcano@free•fr>
Cc: Pavel Emelyanov <xemul@parallels•com>,
Sukadev Bhattiprolu <sukadev@linux•vnet.ibm.com>,
Serge Hallyn <serue@us•ibm.com>,
Linux Netdev List <netdev@vger•kernel.org>,
containers@lists•linux-foundation.org,
Netfilter Development Mailinglist
<netfilter-devel@vger•kernel.org>,
Ben Greear <greearb@candelatech•com>
Subject: Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.
Date: Mon, 08 Mar 2010 12:47:44 -0800 [thread overview]
Message-ID: <m1sk8ar15b.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <4B95611C.5060403@free.fr> (Daniel Lezcano's message of "Mon\, 08 Mar 2010 21\:42\:04 +0100")
Daniel Lezcano <daniel.lezcano@free•fr> writes:
> Eric W. Biederman wrote:
>> Daniel Lezcano <daniel.lezcano@free•fr> writes:
>>
>>
>>> Eric W. Biederman wrote:
>>>
>>>> Daniel Lezcano <daniel.lezcano@free•fr> writes:
>>>>
>>>>
>>>>> Eric W. Biederman wrote:
>>>>>
>>>>>> I have take an snapshot of my development tree and placed it at.
>>>>>>
>>>>>>
>>>>>> git://git.kernel.org/pub/scm/linux/people/ebiederm/linux-2.6.33-nsfd-v5.git
>>>>>>
>>>>> Hi Eric,
>>>>>
>>>>> thanks for the pointer.
>>>>>
>>>>> I tried to boot the kernel under qemu and I got this oops:
>>>>>
>>>> I am clearly running an old userspace on my test machine. No udev.
>>>> It looks like udev has a long standing netlink misfeature, where
>>>> it does not initializing NETLINK_CB....
>>>>
>>>>
>>>> >From 8d85e3ab88718eda3d94cf8e1be14b69dae2b8f1 Mon Sep 17 00:00:00 2001
>>>> From: Eric W. Biederman <ebiederm@xmission•com>
>>>> Date: Mon, 8 Mar 2010 09:25:20 -0800
>>>> Subject: [PATCH] kobject_uevent: Use the netlink allocator helper...
>>>>
>>>> Signed-off-by: Eric W. Biederman <ebiederm@xmission•com>
>>>>
>>> Thanks.
>>>
>>> I was able to boot but I have the following warning:
>>>
>>
>> Thanks for the bug report.
>>
> Thanks to you for the patchset :)
>
>> For the moment you might want to drop:
>> af_netlink: Allow credentials to work across namespaces.
>> af_netlink: Debugging in case I have missed something.
>>
>> Although I am curious if you hit my debugging messages in
>> netlink recv.
>>
> No, it does not appear (looked for "missing NETLINK_CB proto").
>
>> I guess if the goal is to test my nsfd bits you can drop everything
>> starting with my 'scm: Reorder scm_cookie.' commit. The rest is what
>> it takes to get get uids, gid and pids translated when the cross
>> namespaces on an af_unix of an af_netlink socket.
>>
>> At least in the af_netlink case it appears clear I am have missed
>> something.
>>
>> This is a warning that netlink throws when the packet accounting messed
>> up. So it sounds like you are exercising another path that I failed
>> to exercise and fix.
>>
> I will look forward if I find more clues for this warning.
>
> In the meantime was able to enter the container with the ugly following
> program:
>
> #include <unistd.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <syscall.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <sys/param.h>
>
> #define __NR_setns 300
>
> int setns(int nstype, int fd)
> {
> return syscall (__NR_setns, nstype, fd);
> }
>
> int main(int argc, char *argv[])
> {
> char path[MAXPATHLEN];
> char *ns[] = { "pid", "mnt", "net", "pid", "uts" };
> const int size = sizeof(ns) / sizeof(char *);
> int fd[size];
> int i;
>
> if (argc != 3) {
> fprintf(stderr, "mynsenter <pid> <command>\n");
> exit(1);
> }
>
> for (i = 0; i < size; i++) {
> sprintf(path, "/proc/%s/ns/%s", argv[1], ns[i]);
>
> fd[i] = open(path, O_RDONLY);
> if (fd[i] < 0) {
> perror("open");
> return -1;
> }
>
> }
>
> for (i = 0; i < size; i++) {
>
> if (setns(0, fd[i])) {
> perror("setns");
> return -1;
> }
> }
>
> execve(argv[2], &argv[2], NULL);
> perror("execve");
>
> return 0;
> }
>
> At the fist glance, no problem :)
No fork() so your processes is completely in the pid namespace?
Eric
next prev parent reply other threads:[~2010-03-08 20:47 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-14 14:05 RFC: netfilter: nf_conntrack: add support for "conntrack zones" Patrick McHardy
2010-01-14 15:05 ` jamal
2010-01-14 15:37 ` Patrick McHardy
2010-01-14 17:33 ` jamal
2010-01-15 10:15 ` Patrick McHardy
2010-01-15 15:19 ` jamal
2010-02-22 20:46 ` Eric W. Biederman
2010-02-22 21:55 ` jamal
2010-02-22 23:17 ` Eric W. Biederman
[not found] ` <m1wry46es9.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2010-02-23 13:27 ` jamal
2010-02-23 14:07 ` Eric W. Biederman
2010-02-23 14:20 ` jamal
2010-02-23 20:00 ` Eric W. Biederman
2010-02-23 23:09 ` jamal
2010-02-24 1:43 ` Eric W. Biederman
2010-02-25 20:57 ` [RFC][PATCH] ns: Syscalls for better namespace sharing control Eric W. Biederman
2010-02-25 21:31 ` Daniel Lezcano
2010-02-25 21:49 ` Eric W. Biederman
2010-02-25 22:13 ` Daniel Lezcano
2010-02-25 22:31 ` Eric W. Biederman
2010-02-26 20:35 ` Eric W. Biederman
2010-02-25 21:46 ` Matt Helsley
2010-02-25 21:54 ` Eric W. Biederman
2010-02-26 0:53 ` Eric W. Biederman
2010-02-26 1:09 ` Matt Helsley
2010-02-26 1:26 ` Eric W. Biederman
2010-02-26 3:15 ` [RFC][PATCH] ns: Syscalls for better namespace sharing control. v2 Eric W. Biederman
[not found] ` <m18wagy9f3.fsf_-_-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2010-03-03 20:29 ` Jonathan Corbet
2010-03-03 20:50 ` Eric W. Biederman
[not found] ` <m1pr3t2fvl.fsf_-_-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2010-02-26 21:13 ` [RFC][PATCH] ns: Syscalls for better namespace sharing control Pavel Emelyanov
2010-02-26 21:24 ` Eric W. Biederman
2010-02-26 21:34 ` Pavel Emelyanov
2010-02-26 21:42 ` Eric W. Biederman
2010-02-26 21:58 ` Oren Laadan
2010-02-26 22:16 ` Eric W. Biederman
2010-02-26 22:52 ` Oren Laadan
2010-02-26 23:13 ` Eric W. Biederman
2010-02-27 8:30 ` Pavel Emelyanov
2010-02-27 9:04 ` Eric W. Biederman
[not found] ` <m1mxyvrqvk.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2010-02-27 9:21 ` Pavel Emelyanov
2010-02-27 9:42 ` Eric W. Biederman
2010-02-27 16:16 ` Pavel Emelyanov
2010-02-27 19:08 ` Eric W. Biederman
2010-02-27 19:29 ` Pavel Emelyanov
2010-02-27 19:44 ` Eric W. Biederman
2010-02-28 22:05 ` Daniel Lezcano
2010-03-01 19:24 ` Eric W. Biederman
2010-03-01 21:42 ` Eric W. Biederman
2010-03-02 13:10 ` Cedric Le Goater
2010-03-02 15:03 ` Pavel Emelyanov
2010-03-02 15:14 ` Jan Engelhardt
2010-03-02 21:45 ` Eric W. Biederman
2010-03-02 21:19 ` Sukadev Bhattiprolu
2010-03-02 22:13 ` Eric W. Biederman
2010-03-03 0:07 ` Sukadev Bhattiprolu
2010-03-03 0:46 ` Eric W. Biederman
2010-03-03 15:38 ` Serge E. Hallyn
2010-03-03 19:47 ` Eric W. Biederman
2010-03-04 21:45 ` Eric W. Biederman
2010-03-04 22:55 ` Jan Engelhardt
2010-03-03 16:50 ` Pavel Emelyanov
2010-03-03 20:16 ` Eric W. Biederman
2010-03-05 19:18 ` Pavel Emelyanov
2010-03-05 20:26 ` Eric W. Biederman
2010-03-06 14:47 ` Daniel Lezcano
[not found] ` <4B926B1B.5070207-GANU6spQydw@public.gmane.org>
2010-03-06 20:48 ` Eric W. Biederman
[not found] ` <m1aaulyy5c.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2010-03-06 21:26 ` Daniel Lezcano
2010-03-08 8:32 ` Eric W. Biederman
2010-03-08 16:54 ` Daniel Lezcano
2010-03-08 17:29 ` Eric W. Biederman
2010-03-08 19:57 ` Daniel Lezcano
2010-03-08 20:24 ` Eric W. Biederman
2010-03-08 20:42 ` Daniel Lezcano
2010-03-08 20:47 ` Eric W. Biederman [this message]
2010-03-08 21:12 ` Daniel Lezcano
2010-03-08 21:25 ` Eric W. Biederman
2010-03-08 21:49 ` Serge E. Hallyn
2010-03-08 22:24 ` Eric W. Biederman
2010-03-09 10:03 ` Daniel Lezcano
2010-03-09 10:13 ` Eric W. Biederman
2010-03-09 10:26 ` Daniel Lezcano
2010-03-10 21:16 ` Daniel Lezcano
2010-03-08 17:07 ` Serge E. Hallyn
2010-03-08 17:35 ` Eric W. Biederman
2010-03-08 17:47 ` Serge E. Hallyn
2010-03-03 20:59 ` Oren Laadan
2010-03-03 21:05 ` Eric W. Biederman
[not found] ` <m1bpfbwuze.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2010-02-26 21:35 ` Pavel Emelyanov
2010-02-26 21:49 ` Eric W. Biederman
2010-02-23 23:49 ` RFC: netfilter: nf_conntrack: add support for "conntrack zones" Matt Helsley
2010-02-24 1:32 ` Eric W. Biederman
2010-02-24 1:39 ` Serge E. Hallyn
2010-01-14 18:32 ` Ben Greear
2010-01-15 15:03 ` jamal
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