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 :)
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