Public bug reported: 16.04 x64 with 4.4.0-112 or 4.4.0-116 - cannot traverse a DFS link for a cifs.mount from windows if vers is anything other than 1.0 default. (This submission was from a 112 host, but it's confirmed to still exist on anything less than 4.11.)
Fix exists in 4.13.x in Ubuntu 18.x and works fine. Issue is that once you mount with vers=2 or greater, you cannot traverse the dfs root directory to any file server, and you cannot mount the dfs path directly - only a direct mount to the backend fileservers will work. Requesting a backport of the fix as described below as this makes it impossible to move forward with security action disabling SMB1 on our windows environment. If we do that now, will be unable to use that storage from all of our windows systems without directly mapping to individual file servers. https://www.spinics.net/lists/linux-cifs/msg13825.html 1: https://bugzilla.samba.org/show_bug.cgi?id=12917 Aurelien Aptel (3): CIFS: set SERVER_NAME_LENGTH to serverName actual size CIFS: make IPC a regular tcon CIFS: use tcon_ipc instead of use_ipc parameter from SMB2_ioctl It's unclear if this should be treated as a security issue since it's not directly a security problem itself, but rather prevents taking security related action. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-generic 4.4.0.112.118 ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98 Uname: Linux 4.4.0-112-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Feb 8 23:26 seq crw-rw---- 1 root audio 116, 33 Feb 8 23:26 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Tue Mar 6 10:29:20 2018 HibernationDevice: RESUME=/dev/mapper/main-swap IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Error: command ['lsusb'] failed with exit code 1: MachineType: VMware, Inc. VMware Virtual Platform PciMultimedia: ProcFB: 0 svgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-112-generic root=/dev/mapper/main-root ro RelatedPackageVersions: linux-restricted-modules-4.4.0-112-generic N/A linux-backports-modules-4.4.0-112-generic N/A linux-firmware 1.157.15 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/21/2015 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: 6.00 dmi.board.name: 440BX Desktop Reference Platform dmi.board.vendor: Intel Corporation dmi.board.version: None dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 1 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd09/21/2015:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A: dmi.product.name: VMware Virtual Platform dmi.product.version: None dmi.sys.vendor: VMware, Inc. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1753791 Title: Requesting a backport of SMB2/SMB3 bugfix for DFS support To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1753791/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
