Debian Bug report logs - #482069
adduser: If uid 999 exists, next system uid will be between 0-99

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Durk Strooisma <durk@kern.nl>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: adduser: If uid 999 exists, next system uid will be between 0-99

Date: Tue, 20 May 2008 17:57:50 +0200

Package: adduser
Version: 3.107
Severity: normal


If, for whatever reason, there's a system user having uid 999, adduser
will look for a uid starting from 0 when a new system user is created.

In most cases it will find a free uid between 0-99, which is allocated
by the Debian project and for that reason not desirable.

In stead of what seems to happen in reality, I would expect that adduser
would try to look for a free system uid starting from 100 in stead of 0.
It seems to ignore the value of FIRST_SYSTEM_UID in this process.

-- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 2.6.24-1-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages adduser depends on:
ii  debconf [debconf-2.0]         1.5.21     Debian configuration management sy
ii  passwd                        1:4.1.1-1  change and administer password and
ii  perl-base                     5.10.0-10  The Pathologically Eclectic Rubbis

adduser recommends no packages.

-- debconf information excluded

Message #10 received at 482069@bugs.debian.org (full text, mbox, reply):

From: Joerg Hoh <joerg@joerghoh.de>

To: Durk Strooisma <durk@kern.nl>, 482069@bugs.debian.org

Subject: Re: Bug#482069: adduser: If uid 999 exists, next system uid will be between 0-99

Date: Tue, 20 May 2008 20:39:19 +0200

[Message part 1 (text/plain, inline)]

On Tue, May 20, 2008 at 05:57:50PM +0200, Durk Strooisma wrote:

> 
> If, for whatever reason, there's a system user having uid 999, adduser
> will look for a uid starting from 0 when a new system user is created.

I guess the relevant part starts at line 387 off adduser

   elsif (!defined($new_uid) && !$make_group_also) {
        $new_uid = &first_avail_uid($config{"first_system_uid"},
                                   $config{"last_system_uid"});
        if ($new_uid == -1) {
            print STDERR "$0: ";
            printf STDERR gtx("No UID is available in the range %d-%d (FIRST_SYS_UID - LAST_SYS_UID).\n"),$config{"first_system_uid"},$config{"last_system_uid"};
            dief (gtx("The user `%s' was not created.\n"),$new_name);
        }

if first_avail_uid returns -1 (which is indicating that in the range
FIRST_SYS_UID and LAST_SYS_UID there was no free uid), adduser will stop.
I don't see any overflow which causes adduser to start at uid 0 again.

Please correct me if I'm wrong, but I don't get the problem.


Jörg
-- 
What did you do to the cat? It looks half-dead. -Schroedinger's wife

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Message #15 received at 482069@bugs.debian.org (full text, mbox, reply):

From: "Durk Strooisma" <durk@kern.nl>

To: <482069@bugs.debian.org>

Subject: Re: Bug#482069: adduser: If uid 999 exists, next system uid will be between 0-99

Date: Wed, 21 May 2008 10:28:36 +0200 (CEST)

> if first_avail_uid returns -1 (which is indicating that in the range
> FIRST_SYS_UID and LAST_SYS_UID there was no free uid), adduser will stop.
> I don't see any overflow which causes adduser to start at uid 0 again.
>
> Please correct me if I'm wrong, but I don't get the problem.

Hi, I didn't check the code, but while trying to reproduce my described
problem, I couldn't and saw that I made a terrible mistake. I invoked
useradd in stead of adduser.. :-( Adduser IS working the way you would
expect.
Sorry for the noise. Bug can be closed.

Message #20 received at 482069-done@bugs.debian.org (full text, mbox, reply):

From: Stephen Gran <sgran@debian.org>

To: Durk Strooisma <durk@kern.nl>, 482069-done@bugs.debian.org

Subject: Re: [Adduser-devel] Bug#482069: adduser: If uid 999 exists, next system uid will be between 0-99

Date: Wed, 21 May 2008 10:44:09 +0100

[Message part 1 (text/plain, inline)]

This one time, at band camp, Durk Strooisma said:
> > if first_avail_uid returns -1 (which is indicating that in the range
> > FIRST_SYS_UID and LAST_SYS_UID there was no free uid), adduser will stop.
> > I don't see any overflow which causes adduser to start at uid 0 again.
> >
> > Please correct me if I'm wrong, but I don't get the problem.
> 
> Hi, I didn't check the code, but while trying to reproduce my described
> problem, I couldn't and saw that I made a terrible mistake. I invoked
> useradd in stead of adduser.. :-( Adduser IS working the way you would
> expect.
> Sorry for the noise. Bug can be closed.

No problem.  Take care, and good luck.
-- 
 -----------------------------------------------------------------
|   ,''`.                                            Stephen Gran |
|  : :' :                                        sgran@debian.org |
|  `. `'                        Debian user, admin, and developer |
|    `-                                     http://www.debian.org |
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