apport information ** Attachment added: "UdevDb.txt" https://bugs.launchpad.net/bugs/1507463/+attachment/4499894/+files/UdevDb.txt
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lxc in Ubuntu. https://bugs.launchpad.net/bugs/1507463 Title: OverlayFS: Wrong mnt_id and path reported in /proc in linux-3.13 Status in linux package in Ubuntu: Incomplete Status in lxc package in Ubuntu: New Bug description: I am running Ubuntu Trusty (3.13.0-65-generic #106-Ubuntu SMP Fri Oct 2 22:08:27 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux). There are two issues in OverlayFS as follows: 1. /proc/<pid>/fdinfo/<fd> reports wrong mnt_id (non-existent in /proc/<pid>/mountinfo) 2. /proc/<pid>/fd/<fd> shows incorrect path for the symlink target These issues were previously reported and patched for the Ubuntu Vivid kernel (3.19) in bug #1479468, but the patch was not applied to the 3.13 kernel, possibly because it contains an older version of overlayfs. These issues are now adversely affecting some versions of lxc when used in conjunction with the 3.13 kernel, because lxc has recently been patched to pass /proc/<pid>/fd/<fd> to the mount syscall. This change to lxc was made in response to cve-2015-1335; see bug #1476662. The kernel issues cause some overlayfs-backed containers to fail to start, with error message, strace: mount("/home/ubuntu/test.txt", "/proc/self/fd/16", 0x7ffd4c3f7fdb, MS_BIND, NULL) = -1 EACCES (Permission denied) The mount fails because /proc/self/fd/16, which should point to a file in overlayfs, has an invalid value. The version of lxc in the trusty-updates repository, lxc-1.0.7-0ubuntu0.7, is not affected. The following versions of lxc are affected: repository lxc version ---------------------------------------------------------------------------- ppa:ubuntu-lxc/lxc-git-stable-1.0 1.0.7+stable~20151014-2143-0ubuntu1~trusty ppa:ubuntu-lxc/lxc-git-stable-1.1 1.1.3+stable~20151007-2301-0ubuntu1~trusty ppa:ubuntu-lxc/lxc-git-master 1.1.3+master~20151012-0541-0ubuntu1~trusty To reproduce the lxc failure-to-start issue: # Install the 3.13 kernel and also an affected version of lxc. lxc-create -t download -n trusty -- -d ubuntu -r trusty -a amd64; touch $HOME/test.txt; echo "lxc.mount.entry = $HOME/test.txt home/ubuntu/test.txt none bind,create=file 0 0" >> $HOME/.local/share/lxc/trusty/config; lxc-clone -s -B overlayfs trusty trusty_overlay; lxc-start -n trusty_overlay; # fails to start --- AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Oct 19 07:31 seq crw-rw---- 1 root audio 116, 33 Oct 19 07:31 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.14.1-0ubuntu3.15 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory DistroRelease: Ubuntu 14.04 IwConfig: Error: [Errno 2] No such file or directory Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 MachineType: QEMU Standard PC (i440FX + PIIX, 1996) Package: lxc 1.1.3+master~20151012-0541-0ubuntu1~trusty [origin: LP-PPA-ubuntu-lxc-daily] PackageArchitecture: amd64 PciMultimedia: ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-3.13.0-65-generic root=UUID=0ddfd60f-0567-41c7-a1a0-9b562f0b4cf9 ro console=tty1 console=ttyS0 ProcEnviron: TERM=vt102 PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-65-generic root=UUID=0ddfd60f-0567-41c7-a1a0-9b562f0b4cf9 ro console=tty1 console=ttyS0 ProcVersionSignature: Ubuntu 3.13.0-65.106-generic 3.13.11-ckt26 RfKill: Error: [Errno 2] No such file or directory Tags: trusty uec-images third-party-packages trusty uec-images apparmor Uname: Linux 3.13.0-65-generic x86_64 UnreportableReason: This is not an official Ubuntu package. Please remove any third party package and try again. UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video _MarkForUpload: True defaults.conf: lxc.network.type = empty #lxc.network.link = lxcbr0 #lxc.network.flags = up #lxc.network.hwaddr = 00:16:3e:xx:xx:xx dmi.bios.date: 01/01/2011 dmi.bios.vendor: Bochs dmi.bios.version: Bochs dmi.chassis.type: 1 dmi.chassis.vendor: Bochs dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-trusty:cvnBochs:ct1:cvr: dmi.product.name: Standard PC (i440FX + PIIX, 1996) dmi.product.version: pc-i440fx-trusty dmi.sys.vendor: QEMU modified.conffile..etc.default.lxc: [modified] modified.conffile..etc.lxc.default.conf: [modified] mtime.conffile..etc.default.lxc: 2015-10-14T06:30:28.860979 mtime.conffile..etc.lxc.default.conf: 2015-10-14T06:42:05.568979 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1507463/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
