SMB 1 broken in kernel linux-generic-hwe-22.04 (version 6.2.0-31)

[R. Diez]

I was running Ubuntu 22.04.3 on kernel version 5.15.0-82-generic, and I installed package linux-generic-hwe-22.04 in order to upgrade to kernel version 6.2.0-31.

That upgrade broke the SMB version 1 protocol. I know that it is an old, deprecated protocol, but I still have to access some legacy systems and devices in a local network.

This breakage has been discussed on the Internet. It is a Linux kernel regression.

This is the commit that fixes it. It is a very small change:

2f6f19c7aaad "cifs: fix regression in very old smb1 mounts"

https://github.com/torvalds/linux/commit/2f6f19c7aaad5005dc75298a413eb0243c5d312d

I am no Linux kernel expert. Could you please backport that fix to the kernel versions that linux-generic-hwe-22.04 installs?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[R. Diez (rdiezmail-ubuntu)]

This problem seems fixed now, or at least I am no longer having problems with this Linux Kernel version:

6.2.0-34-generic #34~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Sep 7 13:12:03 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

Can somebody else confirm this?

I don't know yet how to check whether that patch mentioned above is included in the latest Ubuntu Kernel version.

[Matthew Ruffell (mruffell)]

Hi rdiez,

Yes, this was fixed in 6.2.0-32-generic, as it included the commit you mentioned in your description.

commit e5e1411ee7e612335d8e9d6fd7379401dee54f28
Author: Paulo Alcantara <email address hidden>
Date: Tue May 23 17:38:38 2023 -0300

    cifs: fix smb1 mount regression

    BugLink: https://bugs.launchpad.net/bugs/2028979

    commit 72a7804a667eeac98888610521179f0418883158 upstream.

    cifs.ko maps NT_STATUS_NOT_FOUND to -EIO when SMB1 servers couldn't
    resolve referral paths. Proceed to tree connect when we get -EIO from
    dfs_get_referral() as well.

    Reported-by: Kris Karas (Bug Reporting) <email address hidden>
    Tested-by: Woody Suwalski <email address hidden>
    Fixes: 8e3554150d6c ("cifs: fix sharing of DFS connections")
    Cc: <email address hidden> # v6.2+
    Signed-off-by: Paulo Alcantara (SUSE) <email address hidden>
    Signed-off-by: Steve French <email address hidden>
    Signed-off-by: Greg Kroah-Hartman <email address hidden>
    Signed-off-by: Kamal Mostafa <email address hidden>
    Signed-off-by: Stefan Bader <email address hidden>

$ git describe --contains e5e1411ee7e612335d8e9d6fd7379401dee54f28
Ubuntu-hwe-6.2-6.2.0-32.32_22.04.1~173

I'll take a look at your 6.5 issues now.

Thanks,
Matthew