unshare (CLONE_NEWUTS)

unshare (CLONE_NEWUTS)

[John David Anglin]

[-- Attachment #1: Type: text/plain, Size: 393 bytes --]

We don't seem to support unshare (CLONE_NEWUTS):

dave@mx3210:~/unshare$ ./unshare
warning: unshare (CLONE_NEWUTS) failed: Operation not permitted
dave@mx3210:~/unshare$ su
Password: 
mx3210:/home/dave/unshare# ./unshare
warning: unshare (CLONE_NEWUTS) failed: Invalid argument

This appears to cause a couple of glibc tests on trunk to fail.

Dave
--
John David Anglin	dave.anglin@bell.net



[-- Attachment #2: unshare.c --]
[-- Type: application/octet-stream, Size: 206 bytes --]

#define _GNU_SOURCE
#include <sched.h>
#include <stdio.h>
#include <unistd.h>
int
main (void)
{
  if (unshare (CLONE_NEWUTS) != 0)
    printf ("warning: unshare (CLONE_NEWUTS) failed: %m\n");
  return 0;
}

Re: unshare (CLONE_NEWUTS)

[Helge Deller]

On 01.04.2017 18:08, John David Anglin wrote:
> We don't seem to support unshare (CLONE_NEWUTS):

We do.

> dave@mx3210:~/unshare$ ./unshare
> warning: unshare (CLONE_NEWUTS) failed: Operation not permitted
> dave@mx3210:~/unshare$ su
> Password: 
> mx3210:/home/dave/unshare# ./unshare
> warning: unshare (CLONE_NEWUTS) failed: Invalid argument
> 
> This appears to cause a couple of glibc tests on trunk to fail.

Your kernel needs to be compiled with UTS support.
Testcase works on phantom (debian default kernel).

Helge