openssh unix dev - May 2002 - [Bug 245] SSH can not log out under Solaris 2.6

http://bugzilla.mindrot.org/show_bug.cgi?id=245





------- Additional Comments From wknox at mitre.org  2002-05-18 00:58 -------
Same issue with Solaris 8 built with gcc 2.95.2 with the following configure
options:

--without-rsh --with-tcp-wrappers --with-pam --disable-suid-ssh
--with-prngd-socket
--with-default-path=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin

Running a ssh -v -v -v hangs up at the following point (I will happily attach
the entire output of this if anyone wants)

$ exit
logout
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0

Hung here until sshd killed 

debug1: channel_free: channel 0: client-session, nchannels 1
debug3: channel_free: status: The following connections are open:
  #0 client-session (t4 r0 i0/0 o0/0 fd 5/6)

debug3: channel_close_fds: channel 0: r 5 w 6 e 7
Connection to oraadm closed by remote host.
Connection to oraadm closed.
debug1: Transferred: stdin 0, stdout 0, stderr 75 bytes in 55.7 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 1.3
debug1: Exit status 0

Unfortunately, running sshd with -d -d -d doesn't completely capture the
problem, as the sshd promptly exits after the first connection closes down
(though this does point to the fact that sshd is able to close). The only oddity
in the sshd -d -d -d is the following message (last message issued before
finishing):

debug1: Cannot delete credentials[7]: Permission denied





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Sounds like a race condition bug. There used to be one like this on the client
side at one point. There also used to be one on the server side.

Nico
--  
> -----Original Message-----
> From: bugzilla-daemon at mindrot.org [mailto:bugzilla-daemon at
mindrot.org]
> Sent: Friday, May 17, 2002 10:58 AM
> To: openssh-unix-dev at mindrot.org
> Subject: [Bug 245] SSH can not log out under Solaris 2.6
> 
> 
> http://bugzilla.mindrot.org/show_bug.cgi?id=245
> 
> 
> 
> 
> 
> ------- Additional Comments From wknox at mitre.org  2002-05-18 
> 00:58 -------
> Same issue with Solaris 8 built with gcc 2.95.2 with the 
> following configure
> options:
> 
> --without-rsh --with-tcp-wrappers --with-pam --disable-suid-ssh
> --with-prngd-socket
> --with-default-path=/usr/local/bin:/usr/bin:/bin:/usr/local/sb
> in:/usr/sbin:/sbin
> 
> Running a ssh -v -v -v hangs up at the following point (I 
> will happily attach
> the entire output of this if anyone wants)
> 
> $ exit
> logout
> debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
> 
> Hung here until sshd killed 
> 
> debug1: channel_free: channel 0: client-session, nchannels 1
> debug3: channel_free: status: The following connections are open:
>   #0 client-session (t4 r0 i0/0 o0/0 fd 5/6)
> 
> debug3: channel_close_fds: channel 0: r 5 w 6 e 7
> Connection to oraadm closed by remote host.
> Connection to oraadm closed.
> debug1: Transferred: stdin 0, stdout 0, stderr 75 bytes in 
> 55.7 seconds
> debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 1.3
> debug1: Exit status 0
> 
> Unfortunately, running sshd with -d -d -d doesn't completely 
> capture the
> problem, as the sshd promptly exits after the first 
> connection closes down
> (though this does point to the fact that sshd is able to 
> close). The only oddity
> in the sshd -d -d -d is the following message (last message 
> issued before
> finishing):
> 
> debug1: Cannot delete credentials[7]: Permission denied
> 
> 
> 
> 
> 
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http://bugzilla.mindrot.org/show_bug.cgi?id=245

stevesk at pobox.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |js at phil.uu.nl



------- Additional Comments From stevesk at pobox.com  2002-05-18 04:54 -------
*** Bug 247 has been marked as a duplicate of this bug. ***



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------- Additional Comments From stevesk at pobox.com  2002-05-18 05:28 -------
i don't know why yet, but the setsid() added to sshd.c
seems to break pty_make_controlling_tty().  will add a patch
to try.



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------- Additional Comments From stevesk at pobox.com  2002-05-18 05:30 -------
Created an attachment (id=96)
remove call to setsid()




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------- Additional Comments From wknox at mitre.org  2002-05-18 06:16 -------
The patch allows logout to occur, and I note that version 3.1p1 run with -d -d
-d also ends with "debug1: Cannot delete credentials[7]: Permission
denied", so
this is not related.

I also note that this patch solves the problem reported on
openssh-unix-dev at mindrot.org in an e-mail by Greg Jewell <gjewell at
cnnxn.com>,
wherein hitting Ctrl-C will break a connection (I both confirmed the problem
without the patch and the lack of the problem with the patch).



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------- Additional Comments From bfriesen at simple.dallas.tx.us  2002-05-18
06:27 -------
The suggested patch resolves the logout problem on my system.
Is it the right fix?



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stevesk at pobox.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sam at kalessin.jpl.nasa.gov



------- Additional Comments From stevesk at pobox.com  2002-05-18 11:34 -------
*** Bug 249 has been marked as a duplicate of this bug. ***



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stevesk at pobox.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |AVShutko at mail.khstu.ru



------- Additional Comments From stevesk at pobox.com  2002-05-18 11:37 -------
*** Bug 250 has been marked as a duplicate of this bug. ***



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------- Additional Comments From rl at math.technion.ac.il  2002-05-18 17:48
-------
Another manifestation of the bug, on solaris 8, was that the ps command broke,
with the message "no controlling terminal". Using the proposed patch
solved the
problem completely.



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------- Additional Comments From robert at gslt.hum.gu.se  2002-05-20 09:38
-------
i think this is related to this bug, compiling 3.2.2p1 for solaris 8, using gcc
3.2 or 2.95.3 will give the following error when logging into tcsh

 "Warning: no access to tty (Inappropriate ioctl 
 for device). Thus no job control in this shell."

in addition to hang on logout. this error does not occur in openssh 3.1p1 on the
same machine.





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------- Additional Comments From robert at gslt.hum.gu.se  2002-05-20 09:42
-------
right forgot to mention in my earlier comment regarding this bug -- login into
sh seems to work just fine. not tcsh though, have not tried other shells



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------- Additional Comments From carson at taltos.org  2002-05-21 04:54 -------
An explanation of the problem is provided by the man page for setsid() on 
Solaris. I'm fairly sure that the behaviour specified is per POSIX.

DESCRIPTION
     The setsid() function creates a new session, if the  calling
     process  is not a process group leader. Upon return the cal-
     ling process will be the session leader of this new session,
     will be the process group leader of a new process group, and
     will have no controlling terminal.

The lack of controlling terminal appears to be the key issue.



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------- Additional Comments From robert at gslt.hum.gu.se  2002-05-22 03:17
-------
hey the patch, id=96, seemed to fix these problems altogether... :) thanks



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------- Additional Comments From stevesk at pobox.com  2002-05-22 04:40 -------
- (stevesk) [sshd.c] bug 245; disable setsid() for now



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------- Additional Comments From pitu at caipy.de  2002-05-28 20:59 -------
Hi there, additional informations:

I installed openssh3.2.2p1 under Solaris 2.6 with the 
following solution I found in the mailinglist (I wonder that the same error is
still in it
...)

#define _FILE_OFFSET_BITS 64    (This is already in)
#define _LARGEFILE64_SOURCE     
(This I added)

into config.h.

So I got also the message that is meantioned from tcsh, it 
apears when
starting a new shell.

 "Warning: no access to tty (Inappropriate ioctl
 for 
device). Thus no job control in this shell."

But also I got a similar message when starting 
bash instead:

 "bash: no job control in this shell"

So if one already applied the patch 
please check this behavior?

greetings,
pitu



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dtucker at zip.com.au changed:

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----------------------------------------------------------------------------
                 CC|                            |john.carroll at usap.gov



------- Additional Comments From dtucker at zip.com.au  2002-06-12 10:43 -------
*** Bug 272 has been marked as a duplicate of this bug. ***



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