kernel-packages team mailing list archive

[Serge Hallyn <1389305@xxxxxxxxxxxxxxxxxx>]

Quoting Adam Ryczkowski (adam.ryczkowski@xxxxxxxxxxxxxx):
> For one thing, the lxc-create can check if it is going to create a 
> user-space container on top of the ecryptfs, and warn the user if 

True.  Though I would prefer not to work around the bug like this
until we are certain that it cannot be made to work (by fixing
ecryptfs in the kernel).


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

** Summary changed:

- sudo doesn't work on unprivileged lxc container
+ sudo doesn't work on unprivileged lxc container on top of ecryptfs

** Changed in: lxc (Ubuntu)
       Status: Invalid => Triaged

** Changed in: lxc (Ubuntu)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1389305

Title:
  sudo doesn't work on unprivileged lxc container on top of ecryptfs

Status in “ecryptfs-utils” package in Ubuntu:
  New
Status in “linux” package in Ubuntu:
  Incomplete
Status in “lxc” package in Ubuntu:
  Triaged

Bug description:
  On Ubuntu 14.04 64 bit, after adding a user into an unprivileged
  container, the sudo complains that:

  $ sudo su
  sudo: effective uid is not 0, is /usr/bin/sudo on a file system with the 'nosuid' option set or an NFS file system without root privileges?

  To reproduce:

  1. Download and install the Ubuntu amd64 minimalcd
  2. Install lxc on it and openssh for convenience.
  3. follow https://www.stgraber.org/2014/01/17/lxc-1-0-unprivileged-containers/ ; specifically do:
       a) sudo usermod --add-subuids 100000-165536 $USER
       b) sudo usermod --add-subgids 100000-165536 $USER
       c) sudo chmod +x $HOME
       d) create the file  ~/.config/lxc/default.conf with the following contents:
  lxc.include = /etc/lxc/default.conf
  lxc.id_map = u 0 100000 65536
  lxc.id_map = g 0 100000 65536
       e) echo "$USER veth lxcbr0 10" | sudo tee /etc/lxc/lxc-usernet
  (restart is not required)
  4. Create the container with
  lxc-create -t download -n p1 -- -d ubuntu -r trusty -a amd64
  5. Install openssh-server in the container:
  lxc-start -d -n p1
  lxc-attach -n p1 -- apt-get install openssh-server
  6. Add a user "adam" with the group sudo
  lxc-attach -n p1 -- adduser adam sudo
  7. Set a password for the user
  8. Log in via ssh (and provide the password from step 7)
  ssh p1@adam
  9. On the p1:
  adam@p1$ sudo su
  sudo: effective uid is not 0, is /usr/bin/sudo on a file system with the 'nosuid' option set or an NFS file system without root privileges?

  I expected it to make change the user to root.

  lxc version: 1.0.3-0ubuntu3
  $cat ~/.cache/lxc/download/ubuntu/trusty/amd64/default/build_id
  20141101_03:49

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