[Samba] User shares do not appear anymore

[Andreas Hasenack]

It looks like a recent security update had something to do with it. I
spotted these bugs in launchpad:

https://bugs.launchpad.net/ubuntu/+source/samba/+bug/2003867
https://bugs.launchpad.net/ubuntu/+source/samba/+bug/2003891


On Thu, Jan 26, 2023 at 3:02 PM Gabriele Bulfon via samba
<samba at lists.samba.org> wrote:
>
> Hi, I have an Ubuntu system with samba 4 that did work perfectly until this morning.
> Normal shares in smb.conf appeared as always, while user shares included with %U did not anymore.
> This is the global part of smb.conf:
>
>         security = user
>         username map = /etc/samba/smbusers
>         include = /etc/samba/smb.conf.%U
>         include = /etc/samba/smb.conf.%m
>
> There are then various smb.conf.[username] with custom shares for the user.
> They always did work, but now they're completely ignored.
> I find this in the log:
>
> [2023/01/26 18:35:35.817936,  0] ../../source3/param/loadparm.c:3431(process_usershare_file)
>   process_usershare_file: stat of /var/lib/samba/usershares/p failed. Permission denied
>
> And /var/lib/samba/usershares is fine:
>
> drwxrwx--T 2 root sambashare 4096 Jan 26 16:44 usershares
>
> And all the path to both usershares and the real user share dir has normal permissions, never changed.
>
> No update to the system, nothing.
> No user, no windows version, not even smbclient can list the user shares.
>
> Can you help?
> Gabriele
>
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