** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1665921
Title:
OverlayFS with readonly NFS lower layer. Operation not supported for
non-root files.
Status in linux package in Ubuntu:
Confirmed
Bug description:
Step to reproduse:
- Crete dircetory with other directories and files.
- Chown some files in this directory, set any non-root permissions.
- Export nfs share with 'ro' permissions.
- Mount nfs share.
- Mount ovrelayfs with nfs as lowerdir
- Try to read theese non-root files or directories:
Example for overlay mount:
# ls -l /var/lib/libvirt
total 16
drwx--x--x 2 root root 4096 Oct 10 07:33 boot
drwx--x--x 2 root root 4096 Oct 10 07:33 images
drwxr-x--- 3 libvirt-qemu kvm 4096 Jan 11 21:49 qemu
drwx------ 2 root root 4096 Oct 10 07:33 sanlock
# ls -l /var/lib/libvirt/qemu/
ls: cannot open directory '/var/lib/libvirt/qemu/': Operation not
supported
And for nfs mount:
# ls -l /rofs/var/lib/libvirt
total 16
drwx--x--x 2 root root 4096 Oct 10 07:33 boot
drwx--x--x 2 root root 4096 Oct 10 07:33 images
drwxr-x--- 3 libvirt-qemu kvm 4096 Jan 11 21:49 qemu
drwx------ 2 root root 4096 Oct 10 07:33 sanlock
# ls -l /rofs/var/lib/libvirt/qemu/
total 4
drwxr-xr-x 3 root root 4096 Jan 11 21:49 channel
If I reset permission, it helps:
# chown libvirt-qemu:kvm /var/lib/libvirt/qemu
# ls -l /var/lib/libvirt/qemu/
total 4
drwxr-xr-x 3 root root 4096 Jan 11 21:49 channel
My mounts (from /proc/mounts)
192.168.101.61:/data/opt/ltsp/amd64 /rofs nfs
ro,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,nolock,proto=tcp,port=2049,timeo=7,retrans=10,sec=sys,local_lock=all,addr=192.168.101.61
0 0
overlay / overlay
rw,relatime,lowerdir=/rofs,upperdir=/cow/up,workdir=/cow/work 0 0
I tested it nfs3 and nfs4 mount, with this kenels:
# uname -a
Linux controller03 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
# uname -a
Linux m1c18n1 4.8.0-36-generic #36~16.04.1-Ubuntu SMP Sun Feb 5 09:39:57
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
---
AlsaDevices:
total 0
crw-rw----+ 1 root audio 116, 1 Feb 11 2016 seq
crw-rw----+ 1 root audio 116, 33 Feb 11 2016 timer
AplayDevices: aplay: device_list:268: no soundcards found...
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
ArecordDevices: arecord: device_list:268: no soundcards found...
AudioDevicesInUse: Error: [Errno 2] No such file or directory
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
DistroRelease: Ubuntu 16.04
IwConfig: Error: [Errno 2] No such file or directory
Lsusb:
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP ProLiant m710p Server Cartridge
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=vmlinuz-4.8.0-36-generic ro
initrd=initrd.img-4.8.0-36-generic init=/sbin/init-ltsp forcepae console=tty1
console=ttyS0,9600 root=/dev/nfs boot=nfs nfsroot=/data/opt/ltsp/amd64
BOOTIF=01-94-57-a5-d3-b9-a6
ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-4.8.0-36-generic N/A
linux-backports-modules-4.8.0-36-generic N/A
linux-firmware 1.157.6
RfKill: Error: [Errno 2] No such file or directory
Tags: xenial
Uname: Linux 4.8.0-36-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
_MarkForUpload: True
dmi.bios.date: 04/06/2016
dmi.bios.vendor: HP
dmi.bios.version: H06
dmi.board.vendor: HP
dmi.chassis.type: 25
dmi.chassis.vendor: HP
dmi.modalias:
dmi:bvnHP:bvrH06:bd04/06/2016:svnHP:pnProLiantm710pServerCartridge:pvr:rvnHP:rn:rvr:cvnHP:ct25:cvr:
dmi.product.name: ProLiant m710p Server Cartridge
dmi.sys.vendor: HP
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