Problem with telnet after upgrade of util-linux

Problem with telnet after upgrade of util-linux

[Henrik Grindal Bakken]

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Hi.  I have a custom Linux distro running where we (unfortunately...)
support telnet, using netkit-telnet-0.17.

A while ago, I upgraded util-linux from 2.20.1 to 2.22-rc2 (to get
sulogin, since I switched to systemd).  One side-effect of this, which
I didn't catch for some time (not frequently using telnet), was that
telnet started chopping some characters off its output.  The changes
appear to be related to login(1).

========================================================
[13:35:17][hgb@prentice:~]12 telnet hgbsaturn
Trying 10.47.37.161...
Connected to hgbsaturn.
Escape character is '^]'.

Linux 3.0.38-199 (hgbsaturn.rd.tandberg.com) (1)

gbsaturn login: 
                ast login: Fri Aug 31 11:35:27 from prentice.rd.tandberg.com
                                                                            hgbsaturn:~] $ 
           elnet.pcap
                     hgbsaturn:~] $ ogout
Connection closed by foreign host.
========================================================

(The hostname was supposed to be 'hgbsaturn'.)

The tcpdump capture of the session is attached.

Has anyone seen anything like this?  I tried to look at the changes in
login between the two versions, but they were too many.  We did use
PAM before too, btw.


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-- 
Henrik Grindal Bakken <hgb@ifi.uio.no>
PGP ID: 8D436E52
Fingerprint: 131D 9590 F0CF 47EF 7963  02AF 9236 D25A 8D43 6E52

Re: Problem with telnet after upgrade of util-linux

[Karel Zak]

On Fri, Aug 31, 2012 at 01:44:03PM +0200, Henrik Grindal Bakken wrote:
> 
> Hi.  I have a custom Linux distro running where we (unfortunately...)
> support telnet, using netkit-telnet-0.17.
> 
> A while ago, I upgraded util-linux from 2.20.1 to 2.22-rc2 (to get
> sulogin, since I switched to systemd).  One side-effect of this, which
> I didn't catch for some time (not frequently using telnet), was that
> telnet started chopping some characters off its output.  The changes
> appear to be related to login(1).

Probably also:
 https://bugzilla.redhat.com/show_bug.cgi?id=904182


-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com

Re: Problem with telnet after upgrade of util-linux

[Henrik Grindal Bakken]

Karel Zak <kzak@redhat.com> writes:

> On Fri, Aug 31, 2012 at 01:44:03PM +0200, Henrik Grindal Bakken wrote:
> > 
> > Hi.  I have a custom Linux distro running where we (unfortunately...)
> > support telnet, using netkit-telnet-0.17.
> > 
> > A while ago, I upgraded util-linux from 2.20.1 to 2.22-rc2 (to get
> > sulogin, since I switched to systemd).  One side-effect of this, which
> > I didn't catch for some time (not frequently using telnet), was that
> > telnet started chopping some characters off its output.  The changes
> > appear to be related to login(1).
> 
> Probably also:
>  https://bugzilla.redhat.com/show_bug.cgi?id=904182

Yeah, I've seen that one.  They don't seem to be very close to a
solution, though.

-- 
Henrik Grindal Bakken <hgb@ifi.uio.no>
PGP ID: 8D436E52
Fingerprint: 131D 9590 F0CF 47EF 7963  02AF 9236 D25A 8D43 6E52