I observe what is likely the same problem on XUbuntu 16.04.5, running these commands in xfce4-terminal:
user1@mysystem:~$ lsb_release -ds;cat /proc/version;echo $SHELL;groups;groups $(whoami) Ubuntu 16.04.5 LTS Linux version 4.15.0-29-generic (buildd@lcy01-amd64-024) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.10)) #31~16.04.1-Ubuntu SMP Wed Jul 18 08:54:04 UTC 2018 /bin/bash user1 user1 : user1 adm disk fax cdrom sudo dip plugdev users lxd lpadmin sambashare libvirtd vboxusers user1@mysystem:~$ ps f PID TTY STAT TIME COMMAND 3544 pts/2 Ss 0:00 bash 3582 pts/2 R+ 0:00 \_ ps f user1@mysystem:~$ cat /proc/3544/loginuid;echo 4294967295 Everything behaves correctly on tty1 or after sudo login + login as user1 on the terminal. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to policykit-1 in Ubuntu. https://bugs.launchpad.net/bugs/1784964 Title: Regression due to CVE-2018-1116 (processes not inheriting user ID or groups ) Status in policykit-1 package in Ubuntu: Confirmed Bug description: This report is tracking a possible regression caused by the recent CVE-2018-1116 patches to policykit-1. On 18.04, since package upgrades on July 23rd, and after the first reboot since then on Aug 1st, I hit an issue with the primary (sudo, adm, etc...) user getting Permission Denied trying to do: tail -f /var/log/syslog when that file is owned by syslog:adm and is g=r. I then found that "groups" reports only the $USER and not the entire list, but "groups $USER" reports all the groups correctly. The user shell is set to /usr/bin/tmux and /etc/tmux.conf has "set -g default-shell /bin/bash" After changing the user's shell back to /bin/bash and logging in on tty1 the list of groups shows correctly for the /bin/bash process running on tty1. I investigated and found that for the affected processes, such as the tmux process, /proc/$PID/loginuid = 4294967295 whereas the /bin/bash process on tty1 correctly reported 1000. The same with the respective gid_map and uid_map. 4294967295 == -1 == 0xFFFFFFFF The recent CVE patch to policykit has several functions where it does "uid = -1" which seems to tie in to my findings so far. I also noticed Ubuntu is still based on version 0.105 which was released in 2012 - upstream released 0.115 with the CVE patch. I suspect the backporting has missed something. The Ubuntu backport patch is: https://git.launchpad.net/ubuntu/+source/policykit-1/commit/?h=applied/ubuntu /bionic-devel&id=840c50182f5ab1ba28c1d20cce4c207364852935 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/policykit-1/+bug/1784964/+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
