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Bug#404794: marked as done (linux-image-2.6.18-3-686: Pb while trying ioctl on /dev/net/tun (module tun))

Your message dated Thu, 15 Mar 2007 19:21:56 +0100
with message-id <20070315182156.GA20455@wavehammer.waldi.eu.org>
and subject line Bug#404794: linux-image-2.6.18-3-686: Pb while trying ioctl on /dev/net/tun (module tun)
has caused the attached Bug report to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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(administrator, Debian Bugs database)
--- Begin Message --- 
Package: linux-image-2.6.18-3-686
Version: 2.6.18-7
Severity: important


I'm using qemu (debian version). When I launch it, it does not work and returns:

  warning: could not configure /dev/net/tun: no virtual network emulation
  Could not initialize device 'tap'

With strace, I've the following error:

  431   open("/dev/net/tun", O_RDWR|O_LARGEFILE) = 3
  431   ioctl(3, TUNSETIFF, 0xbfd0afc0)   = -1 EPERM (Operation not permitted)

But it works with linux-image-2.6.17-2-686.

Thanks,
Xavier

-- System Information:
Debian Release: 4.0
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-3-686
Locale: LANG=fr_FR@euro, LC_CTYPE=fr_FR@euro (charmap=ISO-8859-15)

Versions of packages linux-image-2.6.18-3-686 depends on:
ii  coreutils                     5.97-5     The GNU core utilities
ii  debconf [debconf-2.0]         1.5.11     Debian configuration management sy
ii  initramfs-tools [linux-initra 0.85e      tools for generating an initramfs
ii  module-init-tools             3.3-pre3-1 tools for managing Linux kernel mo

Versions of packages linux-image-2.6.18-3-686 recommends:
pn  libc6-i686                    <none>     (no description available)

-- debconf information excluded


.

--- End Message ---
--- Begin Message --- 
On Thu, Dec 28, 2006 at 10:55:15AM +0100, Xavier wrote:
> I'm using qemu (debian version). When I launch it, it does not work and returns:
> 
>   warning: could not configure /dev/net/tun: no virtual network emulation
>   Could not initialize device 'tap'
> 
> With strace, I've the following error:
> 
>   431   open("/dev/net/tun", O_RDWR|O_LARGEFILE) = 3
>   431   ioctl(3, TUNSETIFF, 0xbfd0afc0)   = -1 EPERM (Operation not permitted)
> 
> But it works with linux-image-2.6.17-2-686.

This is not a bug. For security reasons, only root (to be exact:
CAP_NET_ADMIN) can generate new tun devices since .18.

This will not change, userspace have to acquire this policy.

Bastian

-- 
Beam me up, Scotty, there's no intelligent life down here!

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