CIFS VFS: error -22 on ioctl to get interface list

[Toshikazu Aoyama]

Problem:
Following error logged when mounting Azure file share with CIFS 3.0 protocol.

[ 4856.227895] CIFS VFS: error -22 on ioctl to get interface list

It looks like linux-azure kernel > 5 has some cifs bug. (It might be reproducible with a upstream kernel as well.)
This is not reproducible with -o 2.1 mount option or linux-azure 4.15.
And It can be easily reproducible with platform image like Canonical:UbuntuServer:18.04-LTS:18.04.202002180.

What I have done to reproduce:
VM create CLI command
 $ az vm create --resource-group rgname --name cifsubuntu --image Canonical:UbuntuServer:18.04-LTS:18.04.202002180

mount command
 # mount -t cifs //accountname.file.core.windows.net/test /mnt/somewhere -o vers=3.0,credentials=/etc/smbcredentials/cred.cred --verbose

Do you have any knowledge about this?
As far as I research, SMB2_ioctl which is in cifs kernel module send some invalid parameter to the server.

Here is a debug log.

[  156.667830] SMB2_ioctl:2506: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/smb2pdu.c: SMB2 IOCTL
[  156.667836] smb3_init_transform_rq:3164: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/smb2ops.c: encrypt message returned 0
[  156.667840] __smb_send_rqst:341: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/transport.c: Sending smb: smb_len=177
[  156.668906] cifs_demultiplex_thread:1184: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/connect.c: RFC1002 header 0x7d
[  156.668914] decrypt_raw_data:3205: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/smb2ops.c: decrypt message returned 0
[  156.668915] receive_encrypted_standard:3533: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/smb2ops.c: mid found
[  156.668916] smb2_calc_size:421: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/smb2misc.c: SMB2 data length 0 offset 0
[  156.668917] smb2_calc_size:439: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/smb2misc.c: SMB2 len 73
[  156.668918] smb2_add_credits:122: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/smb2ops.c: add 2 credits total=39
[  156.668924] cifs_sync_mid_result:708: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/transport.c: cifs_sync_mid_result: cmd=11 mid=8 state=4
[  156.668925] Status code returned 0xc000000d STATUS_INVALID_PARAMETER
[  156.668929] map_smb2_to_linux_error:2484: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/smb2maperror.c: Mapping SMB2 status code 0xc000000d to POSIX err -22
[  156.668930] cifs_small_buf_release:222: /build/linux-azure-ZlnYF6/linux-azure-5.0.0/fs/cifs/misc.c: Null buffer passed to cifs_small_buf_release
[  156.668931] CIFS VFS: error -22 on ioctl to get interface list

To enable the debug, I have done following command before mount.
# modprobe cifs
# echo 'module cifs +lfp' > /sys/kernel/debug/dynamic_debug/control
# echo 'file fs/cifs/* +lfp' > /sys/kernel/debug/dynamic_debug/control
# echo 7 > /proc/fs/cifs/cifsFYI

I am not sure but it looks like following SMB2_ioctl has some invalid argument.

"fs/cifs/smb2ops.c"
516 static int
 517 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 518 {
 519         int rc;
 520         unsigned int ret_data_len = 0;
 521         struct network_interface_info_ioctl_rsp *out_buf = NULL;
 522         struct cifs_server_iface *iface_list;
 523         size_t iface_count;
 524         struct cifs_ses *ses = tcon->ses;
 525
 526         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 527                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
 528                         NULL /* no data input */, 0 /* no data input */,
 529                         (char **)&out_buf, &ret_data_len);
 530         if (rc == -EOPNOTSUPP) {
 531                 cifs_dbg(FYI,
 532                          "server does not support query network interfaces\n");
 533                 goto out;
 534         } else if (rc != 0) {
 535                 cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
 536                 goto out;