group.of.nepali.translators team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: kernel-da-key xenial

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Xenial)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1659087

Title:
  open(2) returns EOVERFLOW within tmpfs+userns

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  Confirmed

Bug description:
  On Ubuntu 4.4.0-59.80-generic 4.4.35, open(2) returns EOVERFLOW when
  creating a file in tmpfs with user namespace enabled.

  This issue wasn't present in 4.4.0-47 and has probably been introduced
  by https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1634964

  Step to reproduce:

  $ unshare -r -U -m /bin/bash
  # mount -t tmpfs tmpfs /mnt
  # echo $$
  2354

  In another terminal:

  $ sudo nsenter -t 2354 -m      
  # touch /mnt/foo
  touch: cannot touch '/mnt/foo': Value too large for defined data type

  Note that we are not joining the user namespace when creating the file
  but we would expect `touch' to succeed and create the file with an
  inode set to INVALID_UID/GID (i.e. nobody:nogroup) within the mount
  namespace.

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