talloc use after free in samba3upgrade

Stefan (metze) Metzmacher metze at samba.org
Fri Oct 28 00:36:49 MDT 2011

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.

This is useful in this case:


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