[Samba] locking.tdb: expand_file ftruncate to 8192 failed (Permission denied)

[Axel Thimm]

Hi,

I'm hunting a bug in 3.0.x (tested on 3.0.10 and 3.0.20). Users can
create and modfy files, but cannot delete them. The logs show

[2005/09/21 20:48:14, 0, pid=18388, effective(4019, 412), real(4019, 0)] tdb/tdbutil.c:tdb_log(767)
  tdb(/srv/physik.fu-berlin.de/data/.samba/cluster1-test/cache/locking.tdb): expand_file ftruncate to 8192 failed (Permission denied)
[2005/09/21 20:48:15, 0, pid=18388, effective(4019, 412), real(4019, 0)] tdb/tdbutil.c:tdb_log(767)
  tdb(/srv/physik.fu-berlin.de/data/.samba/cluster1-test/cache/locking.tdb): expand_file ftruncate to 8192 failed (Permission denied)
[2005/09/21 20:48:15, 0, pid=18388, effective(4019, 412), real(4019, 0)] smbd/trans2.c:set_delete_on_close(3533)
  set_delete_on_close: failed to change delete on close flag for file testspampure~

Turning on more debugging one sees that set_delete_on_close returns
NT_STATUS_ACCESS_DENIED. According to the code in 3.0.20 this is
because lock_share_entry_fsp(fsp) returned False. At the time
locking.tdb is being tried to be expanded and later used for locking,
smbd has already become the user and has no permissions to perform the
tasks.

The (ugly) workarround is to make locking.tdb 0666. I've seen similar
reports in google w/o any resolution. Shouldn't expand_file be called
as root?

Is this a buggy code path only some configs lead to? What configs are
these, and how can I avoid them? :)

I can offer more detailed debug logs, if needed. Thanks!

NTSTATUS set_delete_on_close(files_struct *fsp, BOOL delete_on_close)
{
        DEBUG(10,("set_delete_on_close: %s delete on close flag for "
                  "fnum = %d, file %s\n",
                  delete_on_close ? "Adding" : "Removing", fsp->fnum,
                  fsp->fsp_name ));

        if (fsp->is_directory || fsp->is_stat)
                return NT_STATUS_OK;

        if (lock_share_entry_fsp(fsp) == False)
                return NT_STATUS_ACCESS_DENIED;


-- 
Axel.Thimm at ATrpms.net
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