[Pkg-xfce-devel] Bug#887773: It is possible to circumvent authentication after locking screen in lightdm
Matsievskiy S.V.
seregaxvm.main at gmail.com
Sat Mar 3 08:14:59 UTC 2018
Package: lightdm
Version: 1.18.3-4
Followup-For: Bug #887773
Dear Maintainer,
I had the same problem with lightdm. Installing light-locker seems to be
solving it.
If I lock and switch ttys without light-locker, lightdm creates a new seat.
Here is the output of the systemctl for it:
● lightdm.service - Light Display Manager
Loaded: loaded (/lib/systemd/system/lightdm.service; indirect; vendor
preset: enabled)
Active: active (running) since Sat 2018-03-03 10:37:53 MSK; 16min ago
Docs: man:lightdm(1)
Main PID: 848 (lightdm)
Tasks: 10 (limit: 4915)
CGroup: /system.slice/lightdm.service
├─ 848 /usr/sbin/lightdm
├─ 925 /usr/lib/xorg/Xorg :0 -seat seat0 -auth
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
├─27023 /usr/lib/xorg/Xorg :1 -seat seat0 -auth
/var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
└─27091 lightdm --session-child 13 22
With light-locker running everything seems to work as expected. No additional
seat is created.
● lightdm.service - Light Display Manager
Loaded: loaded (/lib/systemd/system/lightdm.service; indirect; vendor
preset: enabled)
Active: active (running) since Sat 2018-03-03 10:54:58 MSK; 1min 20s ago
Docs: man:lightdm(1)
Process: 27948 ExecStartPre=/bin/sh -c [ "$(cat /etc/X11/default-display-
manager 2>/dev/null)" = "/usr/sbin/lightdm" ] (code=exited, status=0/SUCCESS)
Main PID: 27950 (lightdm)
Tasks: 6 (limit: 4915)
CGroup: /system.slice/lightdm.service
├─27950 /usr/sbin/lightdm
└─27955 /usr/lib/xorg/Xorg :0 -seat seat0 -auth
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
-- System Information:
Debian Release: buster/sid
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.14.0-3-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8), LANGUAGE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages lightdm depends on:
ii adduser 3.117
ii dbus 1.12.4-1
ii debconf [debconf-2.0] 1.5.65
ii libaudit1 1:2.8.2-1
ii libc6 2.26-6
ii libgcrypt20 1.8.1-4
ii libglib2.0-0 2.54.3-2
ii libpam-systemd 236-3
ii libpam0g 1.1.8-3.7
ii libxcb1 1.12-1
ii libxdmcp6 1:1.1.2-3
ii lightdm-gtk-greeter [lightdm-greeter] 2.0.4-1
ii lsb-base 9.20170808
Versions of packages lightdm recommends:
ii xserver-xorg 1:7.7+19
Versions of packages lightdm suggests:
ii accountsservice 0.6.45-1
ii upower 0.99.7-2
ii xserver-xephyr 2:1.19.6-1
-- debconf information:
* shared/default-x-display-manager: lightdm
lightdm/daemon_name: /usr/sbin/lightdm
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