Just noticed the PID tree trace didn't match on the Group: from
proc/$PID/status. Here's the corrected output.
$ pid=$BASHPID; while [[ $pid -ne 0 ]]; do ids=$(grep
'^\(.*id:\|Group\)' /proc/$pid/status); echo -e "cmdline: $(cat
/proc/$pid/cmdline) \n $ids" 2>/dev/null; pid=$(echo $ids | awk '{print
$8}'); done
cmdline: -bash
Tgid: 3610
Ngid: 0
Pid: 3610
PPid: 3548
TracerPid: 0
Uid: 1000 1000 1000 1000
Gid: 1000 1000 1000 1000
Groups:
NStgid: 3610
NSpid: 3610
NSpgid: 3610
NSsid: 3610
cmdline: tmux
Tgid: 3548
Ngid: 0
Pid: 3548
PPid: 1
TracerPid: 0
Uid: 1000 1000 1000 1000
Gid: 1000 1000 1000 1000
Groups:
NStgid: 3548
NSpid: 3548
NSpgid: 3548
NSsid: 3548
cmdline: /sbin/init
Tgid: 1
Ngid: 0
Pid: 1
PPid: 0
TracerPid: 0
Uid: 0 0 0 0
Gid: 0 0 0 0
Groups:
NStgid: 1
NSpid: 1
NSpgid: 1
NSsid: 1
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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's
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
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