[Bug 1868456] Re: "sudo: setrlimit(RLIMIT_CORE): Operation not permitted" error when using sudo in 20.04 LXD container

[Stéphane Graber]

We'll want that sudo fix included in Ubuntu.

It's the usual catch with unprivileged containers only being able to
lower their limits and never raise them so there's nothing we can really
do about it in LXD.

** Changed in: lxd (Ubuntu)
       Status: New => Invalid

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Title:
  "sudo: setrlimit(RLIMIT_CORE): Operation not permitted" error when
  using sudo in 20.04 LXD container

Status in lxd package in Ubuntu:
  Invalid
Status in sudo package in Ubuntu:
  Confirmed

Bug description:
  I fired up a LXD container using ubuntu-daily:f on my machine and
  every time I issue a comment inside the container using sudo, I get
  this error:

  sudo: setrlimit(RLIMIT_CORE): Operation not permitted

  I did some digging online and found this was reported against Fedora last fall which lead me to this bugzilla report:
  https://bugzilla.redhat.com/show_bug.cgi?id=1773148

  which seems to tie this to a change in sudo between 1.8.28 and 1.8.29.

  Focal has 1.8.31:
  bladernr at focal-builder:~/development/kernels-ubuntu/focal$ apt-cache policy sudo
  sudo:
    Installed: 1.8.31-1ubuntu1
    Candidate: 1.8.31-1ubuntu1
    Version table:
   *** 1.8.31-1ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status

  This is not an issue on Bionic:
  bladernr at galactica:~/development/kernels-upstream/mainline$ apt-cache policy sudo
  sudo:
    Installed: 1.8.21p2-3ubuntu1.2
    Candidate: 1.8.21p2-3ubuntu1.2
    Version table:
   *** 1.8.21p2-3ubuntu1.2 500
          500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
          100 /var/lib/dpkg/status
       1.8.21p2-3ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

  From the redhat bug, the described workaround does clear these
  messages up:

  # set disable_coredump false

  Once I've done that, the error messages go away.

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