Daniel Lezcano <daniel.lezcano@xxxxxxx> writes:
> Eric W. Biederman wrote:
>> Daniel Lezcano <daniel.lezcano@xxxxxxx> writes:
>>
>>
>>> Eric W. Biederman wrote:
>>>
>>>> Daniel Lezcano <daniel.lezcano@xxxxxxx> 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@xxxxxxxxxxxx>
>>>> 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@xxxxxxxxxxxx>
>>>>
>>> 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
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