[Samba] pdbedit dump core

[Rowland Penny]

On Wed, 2021-09-22 at 21:12 +1200, Andrew Bartlett via samba wrote:
> On Wed, 2021-09-22 at 10:07 +0100, Rowland Penny via samba wrote:
> > On Wed, 2021-09-22 at 08:32 +0200, Jacques Beigbeder via samba
> > wrote:
> > > Hello Samba users,
> > > 
> > > Environment: Ubuntu 20.04 up to date
> > > Linux users: 3500 logins
> > > 
> > > For 1 user, says cpier:
> > > # samba-tool user show cpier : seems OK
> > > # pdbedit -L -w | grep cpier: seems OK
> > > # smbpasswd cpier : works
> > > # samba-tool dbcheck : is OK
> > > # pdbedit -i smbpasswd:FILE : worked for 2306 entries on 3500,
> > >   and failed.
> > >   
> > > One experiment:
> > > # cat s
> > > cpier:34164:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:31D6CFE0D16...
> > > # pdbedit -i smbpasswd:s
> > > Segmentation fault (core dumped)
> > > 
> > > syslog then tells:
> > >   kernel: [ 1580.615611] pdbedit[1311]: segfault at 0 ip
> > > 00007f6dd3d2ae34 s... error 4 in libsamba-passdb.so.0.28.0[
> > >   kernel: [ 1580.615617] Code: fd 53 48 8b bf 10 02 00 00 e8 58
> > > 75
> > > ff
> > > ff 4c ...
> > > 
> > > Why? Is there a way to fix?
> > > My purpose is to transfer an smbpasswd file from one computer
> > > to another. I don't have user passwords to use smbpasswd!
> > 
> > Can you give us more information on how you are running Samba, it
> > sounds like you are running Samba as a standalone server, but you
> > refer
> > to samba-tool that only works with AD.
> 
> Running pdbedit under gdb with gdb --args pdbedit ...
> 
> Then 'r' for run.
> 
> When it crashes getting a backtrace with 'bt' would be useful.  I
> would
> normally ask for a 'bt full' bit given the situation this is likely
> to
> contain sensitive info.
> 

Yes, nothing in Samba should have segmentation faults, but I would
still like to know just what the OP is trying to do, there may be a
better way of doing it.

Rowland