tdbsam corruption?

[Andrew Bartlett]

On Tue, 2004-05-04 at 19:50, Tom Alsberg wrote:
> Having built samba-3.0.3 today, I tried the following:
> 
> dev# smbpasswd -a smbtest
> (entered a password twice, was accepted)
> 
> then:
> 
> dev# pdbedit -L
> smbtest:31001:Samba Test User
> 
> Now, after I started smbd and nmbd, doing:
> 
> $ smbclient -L dev -U smbtest
> 
> succeeds.
> 
> But then:
> 
> dev# pdbedit -L
> pdbedit in free(): warning: junk pointer, too high to make sense
> pdbedit in free(): warning: junk pointer, too high to make sense
> pdbedit in free(): warning: junk pointer, too high to make sense
> pdbedit in free(): warning: chunk is already free
> pdbedit in free(): warning: junk pointer, too high to make sense
> pdbedit in free(): warning: junk pointer, too high to make sense
> pdbedit in free(): warning: junk pointer, too high to make sense
> pdbedit in free(): warning: junk pointer, too high to make sense
> pdbedit in free(): warning: chunk is already free
> pdbedit in free(): warning: junk pointer, too high to make sense
> pdbedit in free(): warning: junk pointer, too high to make sense
> pdb_getsampwent: Bad SAM_ACCOUNT entry returned from TDB!
> :4294967295:
> Segmentation fault (core dumped)

What OS is this?  Are you sure that Samba was built correctly?

> Yet, connecting to samba still works (authentication succeeds when it
> should).  Also, smbd does not modify the passdb.tdb file (its
> timestamp remains older).  But the secrets.tdb file is modified when a
> user connects - why is that?  

Updating secrets.tdb with a new random seed (possibly not required, see
my post to this list recently)

> And why does pdbedit -L not like it (and
> segfault?)
> 
> I have the following in my test smb.conf:
> 
>         passdb backend  = tdbsam 
>         auth methods    = sam

NEVER touch this setting.  (Well, at the very least, you need 'guest
sam_ignoredomain' for a standalone server, and you need to know both
what the undocumented defaults are, and what effect you desire...)

> Can anyone reproduce this problem at all?  Can this be a problem
> affecting smbd, or is it only a read problem with pdbedit?

Andrew Bartlett

-- 
Andrew Bartlett                                 abartlet at pcug.org.au
Manager, Authentication Subsystems, Samba Team  abartlet at samba.org
Student Network Administrator, Hawker College   abartlet at hawkerc.net
http://samba.org     http://build.samba.org     http://hawkerc.net
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