[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Rolf Leggewie]

** Changed in: samba (Ubuntu Karmic)
   Status: Triaged => Won't Fix

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Title:
  winbind crashes on authentication (winbind_pam_auth)

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Clint Byrum]

Since Jaunty is EOL, closing Jaunty task as Won't Fix.

** Changed in: samba (Ubuntu Jaunty)
   Status: Triaged => Won't Fix

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Title:
  winbind crashes on authentication (winbind_pam_auth)

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Thierry Carrez]

Thanks, Ray ! So it's fixed upstream in 3.4.3 / 3.3.9, which confirms
John's experience. we should push this to the next Samba SRU.

** Changed in: samba (Ubuntu Karmic)
   Importance: Undecided => Medium

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Ray Van Dolson]

I was attempting to track this down for RHEL5 (see here[1]).  When I
apply the patch generated by this commit[2], I can no longer reproduce
the winbind segfault.

This is against RHEL5's 3.3.8 and, I would assume, would be appropriate
for Ubuntu's 3.3.x version as well.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=565915
[2] 
http://gitweb.samba.org/?p=samba.git;a=commit;h=62a1d9101cf0c2d45f81ba703cfdef5f42006b3f

** Bug watch added: Red Hat Bugzilla #565915
   https://bugzilla.redhat.com/show_bug.cgi?id=565915

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Ray Van Dolson]

Just to clarify, you've tried the 3.3.x patches in Samba bug 6793[1] and
they do not resolve the issue?  Also am trying to track this problem
down.

[1] https://bugzilla.samba.org/show_bug.cgi?id=6793

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Chuck Short]

We havent tracked down the fix for this yet.

Regards
chuck

** Changed in: samba (Ubuntu Jaunty)
   Status: New => Triaged

** Changed in: samba (Ubuntu Karmic)
   Status: New => Triaged

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Thierry Carrez]

Thanks for the pointers, it's very useful. I'd try the first one first,
it seems closer to what you experience. I'll see if I can spend some
time getting a patch in a PPA for you to test the fix.

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[John Shearar]

** Bug watch added: Samba Bugzilla #6793
   https://bugzilla.samba.org/show_bug.cgi?id=6793

** Bug watch added: Samba Bugzilla #6811
   https://bugzilla.samba.org/show_bug.cgi?id=6811

** Bug watch added: Samba Bugzilla #6840
   https://bugzilla.samba.org/show_bug.cgi?id=6840

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Re: [Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[John Shearar]

@Thierry: I don't know if it's helpful, but I took a look at the release
notes for the later versions of samba and found three fixes that roughly
relate to the same module, at least:

(3.4.3)
* BUG 6793  : Fix segfault
in winbindd_pam_auth.
* BUG 6811  : Fix reference
to freed memory in pam_winbind.
* BUG 6840  : Fix crash in
pam_winbind.

Perhaps you've already disqualified them; I don't know enough about the
codebase to confirm one way or the other.

Regards,
John


On Fri, Jan 15, 2010 at 10:10 AM, Thierry Carrez
wrote:

> @John: Sure. The bug has been nominated for karmic and jaunty, now it's
> a matter of identifying the necessary patch, since I didn't find
> anything close in samba's bugzilla.
>
> --
> winbind crashes on authentication (winbind_pam_auth)
> https://bugs.launchpad.net/bugs/503402
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “samba” package in Ubuntu: Fix Released
> Status in “samba” source package in Jaunty: New
> Status in “samba” source package in Karmic: New
>
> Bug description:
> Binary package hint: samba
>
> This box was configured as a domain member on a window2k8 Active Directory
> domain. It was recently upgraded from Intrepid 8.10 , running samba
> 2:3.2.3-1ubuntu3.6, to Jaunty 9.04, running 2:3.3.2-1ubuntu3.2, and now the
> winbind daemon frequently crashes on authentication (but occasionally it
> will work for several auths with no problem).
>
> # lsb_release -rd
> Description:Ubuntu 9.04
> Release:9.04
>
> # apt-cache policy winbind
> winbind:
>   Installed: 2:3.3.2-1ubuntu3.2
>   Candidate: 2:3.3.2-1ubuntu3.2
>   Version table:
>  *** 2:3.3.2-1ubuntu3.2 0
> 500 http://za.archive.ubuntu.com jaunty-updates/main Packages
> 500 http://za.archive.ubuntu.com jaunty-security/main Packages
> 100 /var/lib/dpkg/status
>  2:3.3.2-1ubuntu3 0
> 500 http://za.archive.ubuntu.com jaunty/main Packages
>
> To reproduce the problem:
>
> # wbinfo -t
> checking the trust secret via RPC calls succeeded
> # wbinfo -a john
> Enter john's password:
> plaintext password authentication succeeded
> Enter john's password:^C
> Interupted by signal.
>
> /var/log/auth.log shows the authentication as successful...
> Jan  5 09:56:24 havelock sshd[8729]: pam_winbind(sshd:auth): user 'john'
> granted access
>
> ... but  /var/log/samba/log.winbindd: (debug 4) indicates the crash
>
> [2010/01/05 09:56:24,  3] winbindd/winbindd_pam.c:winbindd_pam_auth(827)
>   [ 8729]: pam auth john
> *** glibc detected *** /usr/sbin/winbindd: double free or corruption
> (!prev): 0x7faef5b91d90 ***
> === Backtrace: =
> /lib/libc.so.6[0x7faef1465cb8]
> /lib/libc.so.6(cfree+0x76)[0x7faef1468276]
> /usr/lib/libtalloc.so.1[0x7faef196f888]
> /usr/lib/libtalloc.so.1(talloc_free+0xd8)[0x7faef1971b38]
> /usr/sbin/winbindd[0x7faef37dacd7]
> /usr/sbin/winbindd[0x7faef37db443]
> /usr/sbin/winbindd(main+0xd6a)[0x7faef37dc299]
> /lib/libc.so.6(__libc_start_main+0xe6)[0x7faef140c5a6]
> /usr/sbin/winbindd[0x7faef37da249]
>
> I have duplicated the box as a vm, and upgraded that to Karmic, which has
> the same symptom, although with a slightly different error. I -think- the
> problems are related, so I'll include it :
>
> Description:Ubuntu 9.10
> Release:9.10
>
> winbind:
>   Installed: 2:3.4.0-3ubuntu5.1
>   Candidate: 2:3.4.0-3ubuntu5.1
>   Version table:
>  *** 2:3.4.0-3ubuntu5.1 0
> 500 http://za.archive.ubuntu.com karmic-updates/main Packages
> 100 /var/lib/dpkg/status
>  2:3.4.0-3ubuntu5 0
> 500 http://za.archive.ubuntu.com karmic/main Packages
>
> On any winbind authentication: ssh, console login, wbinfo -a
>
> /var/log/auth.log: pam_winbind.so debug
>
> Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): Verify
> user 'john'
> Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): request
> wbcLogonUser succeeded
> Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): user
> 'john' granted access
> Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): Returned
> user was 'john'
> Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): [pamh:
> 0x7f59513206c0] LEAVE: pam_sm_authenticate returning 0 (PAM_SUCCESS)
> Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:account): [pamh:
> 0x7f59513206c0] ENTER: pam_sm_acct_mgmt (flags: 0x)
>
> /var/log/samba/log.winbindd: (debug 10)
>
> [2010/01/05 10:40:23,  3] winbindd/winbindd_pam.c:827(winbindd_pam_auth)
>   [ 3306]: pam auth john
> [2010/01/05 10:40:23, 10]
> winbindd/winbindd_cache.c:492(refresh_sequence_number)
>   refresh_sequence_number: FFAD time ok
> [2010/01/05 10:40:23, 10]
> winbindd/winbindd_cache.c:537(refresh_sequence_number)
>   refresh_sequence_number: FFAD seq number is now 207165758
> [2010/01/05 10:40:23,

[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Thierry Carrez]

@John: Sure. The bug has been nominated for karmic and jaunty, now it's
a matter of identifying the necessary patch, since I didn't find
anything close in samba's bugzilla.

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[John Shearar]

It is not feasible to upgrade my production boxes to a development
release, and I would prefer not to mix'n'match sources from different
releases (there-in lies madness). Since lucid is still a way off, would
it be possible for this version of samba to be backported to karmic?

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Thierry Carrez]

** Also affects: samba (Ubuntu Jaunty)
   Importance: Undecided
   Status: New

** Also affects: samba (Ubuntu Karmic)
   Importance: Undecided
   Status: New

** Changed in: samba (Ubuntu)
   Status: Incomplete => Fix Released

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[John Shearar]

The problem doesn't seem to occur in samba 3.4.3-2ubuntu1 in my test
environment.

samba:
  Installed: 2:3.4.3-2ubuntu1
  Candidate: 2:3.4.3-2ubuntu1
  Version table:
 *** 2:3.4.3-2ubuntu1 0
500 http://za.archive.ubuntu.com lucid/main Packages
100 /var/lib/dpkg/status


Thank you for your time!

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[John Shearar]

** Description changed:

  Binary package hint: samba
  
  This box was configured as a domain member on a window2k8 Active
- Directory domain. It was recently upgraded from Intrepid 9.04 , running
- samba 2:3.2.3-1ubuntu3.6, to Jaunty 9.10, running 2:3.3.2-1ubuntu3.2,
+ Directory domain. It was recently upgraded from Intrepid 8.10 , running
+ samba 2:3.2.3-1ubuntu3.6, to Jaunty 9.04, running 2:3.3.2-1ubuntu3.2,
  and now the winbind daemon frequently crashes on authentication (but
  occasionally it will work for several auths with no problem).
  
  # lsb_release -rd
  Description:Ubuntu 9.04
  Release:9.04
  
  # apt-cache policy winbind
  winbind:
-   Installed: 2:3.3.2-1ubuntu3.2
-   Candidate: 2:3.3.2-1ubuntu3.2
-   Version table:
-  *** 2:3.3.2-1ubuntu3.2 0
- 500 http://za.archive.ubuntu.com jaunty-updates/main Packages
- 500 http://za.archive.ubuntu.com jaunty-security/main Packages
- 100 /var/lib/dpkg/status
-  2:3.3.2-1ubuntu3 0
- 500 http://za.archive.ubuntu.com jaunty/main Packages
+   Installed: 2:3.3.2-1ubuntu3.2
+   Candidate: 2:3.3.2-1ubuntu3.2
+   Version table:
+  *** 2:3.3.2-1ubuntu3.2 0
+ 500 http://za.archive.ubuntu.com jaunty-updates/main Packages
+ 500 http://za.archive.ubuntu.com jaunty-security/main Packages
+ 100 /var/lib/dpkg/status
+  2:3.3.2-1ubuntu3 0
+ 500 http://za.archive.ubuntu.com jaunty/main Packages
  
  To reproduce the problem:
  
  # wbinfo -t
  checking the trust secret via RPC calls succeeded
  # wbinfo -a john
  Enter john's password:
  plaintext password authentication succeeded
  Enter john's password:^C
  Interupted by signal.
  
  /var/log/auth.log shows the authentication as successful...
  Jan  5 09:56:24 havelock sshd[8729]: pam_winbind(sshd:auth): user 'john' 
granted access
  
  ... but  /var/log/samba/log.winbindd: (debug 4) indicates the crash
  
  [2010/01/05 09:56:24,  3] winbindd/winbindd_pam.c:winbindd_pam_auth(827)
-   [ 8729]: pam auth john
+   [ 8729]: pam auth john
  *** glibc detected *** /usr/sbin/winbindd: double free or corruption (!prev): 
0x7faef5b91d90 ***
  === Backtrace: =
  /lib/libc.so.6[0x7faef1465cb8]
  /lib/libc.so.6(cfree+0x76)[0x7faef1468276]
  /usr/lib/libtalloc.so.1[0x7faef196f888]
  /usr/lib/libtalloc.so.1(talloc_free+0xd8)[0x7faef1971b38]
  /usr/sbin/winbindd[0x7faef37dacd7]
  /usr/sbin/winbindd[0x7faef37db443]
  /usr/sbin/winbindd(main+0xd6a)[0x7faef37dc299]
  /lib/libc.so.6(__libc_start_main+0xe6)[0x7faef140c5a6]
  /usr/sbin/winbindd[0x7faef37da249]
  
- 
- 
- I have duplicated the box as a vm, and upgraded that to Karmic, which has the 
same symptom, although with a slightly different error. I -think- the problems 
are related, so I'll include it :
+ I have duplicated the box as a vm, and upgraded that to Karmic, which
+ has the same symptom, although with a slightly different error. I
+ -think- the problems are related, so I'll include it :
  
  Description:Ubuntu 9.10
  Release:9.10
  
  winbind:
-   Installed: 2:3.4.0-3ubuntu5.1
-   Candidate: 2:3.4.0-3ubuntu5.1
-   Version table:
-  *** 2:3.4.0-3ubuntu5.1 0
- 500 http://za.archive.ubuntu.com karmic-updates/main Packages
- 100 /var/lib/dpkg/status
-  2:3.4.0-3ubuntu5 0
- 500 http://za.archive.ubuntu.com karmic/main Packages
+   Installed: 2:3.4.0-3ubuntu5.1
+   Candidate: 2:3.4.0-3ubuntu5.1
+   Version table:
+  *** 2:3.4.0-3ubuntu5.1 0
+ 500 http://za.archive.ubuntu.com karmic-updates/main Packages
+ 100 /var/lib/dpkg/status
+  2:3.4.0-3ubuntu5 0
+ 500 http://za.archive.ubuntu.com karmic/main Packages
  
  On any winbind authentication: ssh, console login, wbinfo -a
  
  /var/log/auth.log: pam_winbind.so debug
  
  Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): Verify user 
'john'
  Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): request 
wbcLogonUser succeeded
  Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): user 'john' 
granted access
  Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): Returned 
user was 'john'
  Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:auth): [pamh: 
0x7f59513206c0] LEAVE: pam_sm_authenticate returning 0 (PAM_SUCCESS)
  Jan  5 10:40:23 testhavelock sshd[3306]: pam_winbind(sshd:account): [pamh: 
0x7f59513206c0] ENTER: pam_sm_acct_mgmt (flags: 0x)
  
  /var/log/samba/log.winbindd: (debug 10)
  
  [2010/01/05 10:40:23,  3] winbindd/winbindd_pam.c:827(winbindd_pam_auth)
-   [ 3306]: pam auth john
+   [ 3306]: pam auth john
  [2010/01/05 10:40:23, 10] 
winbindd/winbindd_cache.c:492(refresh_sequence_number)
-   refresh_sequence_number: FFAD time ok
+   refresh_sequence_number: FFAD time ok
  [2010/01/05 10:40:23, 10] 
winbindd/winbindd_cache.c:537(refresh_sequence_number)
-   refresh_sequence_number: FFAD seq number is now 207165758
+   refresh_sequence_number: FFAD seq number is now 207165758
  [2010/01/

[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[Thierry Carrez]

Couldn't find anything relevant on upstream bugtracker. Let me know if
you could also test a lucid upgrade in a vm to check if 3.4.3 behaves
any better in your configuration.

** Changed in: samba (Ubuntu)
   Importance: Undecided => Medium

** Changed in: samba (Ubuntu)
   Status: New => Incomplete

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[John Shearar]

** Attachment added: "winbind-3.4.0-double-linked-list-corruption.txt"
   
http://launchpadlibrarian.net/37451009/winbind-3.4.0-double-linked-list-corruption.txt

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[Bug 503402] Re: winbind crashes on authentication (winbind_pam_auth)

[John Shearar]

** Attachment added: "winbind-3.3.2_double_free_crash.txt"
   http://launchpadlibrarian.net/37451002/winbind-3.3.2_double_free_crash.txt

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