** Description changed:
- When using `sudo --login --user USERNAME` with Ubuntu Focal currently,
- it will correctly operate but it will also throw the following error
- before continuing with the logon process (which completes successfully
- except for the stated error):
+ [Impact]
+ Logging in as a sudo user in a Ubuntu Focal Linux container displays a
+ warning:
+
+ sudo: setrlimit(RLIMIT_CORE): Operation not permitted
+
+ The warning is entirely unnecessary - the container is trying to adjust
+ RLIMIT_CORE, but this isn't allowed inside a container anyway.
+
+ While this is "just" a warning, logging into a container as sudo is a
+ very common practice, so this warning risks creating confusion for LTS
+ users.
+
+ [Test Case]
+ $ lxc launch ubuntu:20.04/amd64 sudo-sru-lp1857036-test
+ $ lxc shell sudo-sru-lp1857036-test
+
+ # sudo --login --user ubuntu
+ sudo: setrlimit(RLIMIT_CORE): Operation not permitted
+ To run a command as administrator (user "root"), use "sudo <command>".
+ See "man sudo_root" for details.
+ $ logout
+
+ Install the PPA
+ # apt-add-repository -yus ppa:bryce/sudo-sru-lp1857036-setrlimit-in-lxc
+ # apt-get install sudo
+
+ # sudo --login --user ubuntu
+ To run a command as administrator (user "root"), use "sudo <command>".
+ See "man sudo_root" for details.
+ $
+
+ [Regression Potential]
+ As this only affects printing of a couple warnings, the only behavioral
+ change is in stderr output.
+
+ [Discussion]
+ This changes a couple warnings into equivalent debug printfs, which
+ brings the sudo behavior in-line with the behavior in groovy, bionic,
+ etc. and should cause no troubles.
+
+ This patch originates from upstream, and is already in groovy's sudo
+ package (which thus can be seen not to exhibit the issue).
+
+ The upstream patch includes some new debug prints which should be
+ harmless but are unnecessary to the fix so they've been removed.
+
+
+ [Original Report]
+ When using `sudo --login --user USERNAME` with Ubuntu Focal currently, it
will correctly operate but it will also throw the following error before
continuing with the logon process (which completes successfully except for the
stated error):
sudo: setrlimit(RLIMIT_CORE): Operation not permitted
A full run of this was tested in a Focal LXD container after dropping to
a root shell to reproduce (arstotzka is the host system, focal-test is
the test container):
teward@arstotzka:~$ lxc shell focal-test
root@focal-test:~# sudo --login --user ubuntu
sudo: setrlimit(RLIMIT_CORE): Operation not permitted
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.
ubuntu@focal-test:~$
This appears to be similar to this issue identified on RedHat's tracker:
https://bugzilla.redhat.com/show_bug.cgi?id=1773148
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: sudo 1.8.29-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
Uname: Linux 4.15.0-72-generic x86_64
ApportVersion: 2.20.11-0ubuntu14
Architecture: amd64
Date: Thu Dec 19 17:16:31 2019
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: sudo
UpgradeStatus: No upgrade log present (probably fresh install)
VisudoCheck:
/etc/sudoers: parsed OK
/etc/sudoers.d/90-cloud-init-users: parsed OK
/etc/sudoers.d/README: parsed OK
** Changed in: sudo (Ubuntu Focal)
Assignee: (unassigned) => Bryce Harrington (bryce)
** Changed in: sudo (Ubuntu Focal)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1857036
Title:
`sudo --login --user USERNAME` throws `setrlimit(RLIMIT_CORE):
Operation not permitted` error when run inside a container.
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