talloc use after free in samba3upgrade

Adam Tauno Williams awilliam at whitemice.org
Mon Nov 7 06:55:55 MST 2011

Quoting "Stefan (metze) Metzmacher" <metze at samba.org>:

> Am 28.10.2011 00:26, schrieb Andrew Bartlett:
>> On Thu, 2011-10-27 at 08:40 -0400, Adam Tauno Williams wrote:
>>> Quoting Adam Tauno Williams <awilliam at whitemice.org>:
>>>> On Tue, 2011-09-20 at 08:16 -0700, Andrew Bartlett wrote:
>>>>> On Mon, 2011-09-19 at 22:20 +0200, Pavel Herrmann wrote:
>>>>>> On Monday 19 of September 2011 16:03:20 Adam Tauno Williams wrote:
>>>>>>> Quoting Adam Tauno Williams <awilliam at whitemice.org>:
>>>>>>> linux-hvej:~ # /opt/s4/sbin/samba-tool user setpassword administrator
>>>>>>> New Password:
>>>>>>> Changed password OK
>>>>>>>   --- kinit says my password expired, and can't change it (???
>>>>>>> linux-hvej:~ # kinit administrator at MICORE.US
>>>>>>> Password for administrator at MICORE.US:
>>>>>>> Password expired.  You must change it now.
>>>>>>> Enter new password:
>>>>>>> Enter it again:
>>>>>>> kinit: Password has expired while getting initial credentials
>>>>>> you can try setting passwords to never expir
>>>>>> samba-tool pwsettings set --max-pwd-age=0
>>>>> If this is required, it means that the password polices were not
>>>>> upgraded correctly.  This was a bug in earlier versions of this tool,
>>>>> but I thought it had been fixed.
>>>>> If this is still happening with current GIT, can you get me the ldif of
>>>>> your domain object?  I want to check that the maxPwdAge is is negative
>>>>> nanoseconds, not positive seconds.  (NTTIME vs unix time).
>>>> I'll update my git, rebuild, and import again [hopefully today, but it
>>>> may take a couple of days]/
>>> I finally got back to my AD migration.  After pulling the git and
>>> rebuilding the import now fails completely.
>>> linux-hvej:~ # samba-tool domain samba3upgrade --dbdir=/tmp/x   
>>> /tmp/x/smb.conf
>>> Reading smb.conf
>>> Provisioning
>>> no talloc stackframe around, leaking memory
>>> Exporting account policy
>>> Exporting groups
>>> talloc: access after free error - first free may be at ?? [wonky  
>>> characters]
>>> Bad talloc magic value - access after free
>>> Aborted
>> Can you run it under valgrind, eg:
>> valgrind /usr/bin/python /usr/local/samba/sbin/samba-tool domain
>> samba3upgrade --dbdir=/tmp/x  /tmp/x/smb.conf
>> There will be noise from python's own allocation libs, but it should
>> also give us the clue we need here.

Output of the valgrind is attached.

linux-hvej:~ # /opt/s4/sbin/samba --version
Version 4.0.0alpha18-GIT-1d53109

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