A Xubuntu 16.04 fully patched machine with a freshly created user wont let me unlock after using light-locker to lock my screen (regardless if lock was activated manually or via timeout). The screen remains black (but powered) on correct password entry
Killing light-locker from tty1 will reveal the desktop then (and consequently prevents further locking).
Steps attempted:
This session is locked: You will be redirected to the unlock dialog automatically in a few seconds
message - without any redirection taking placeloginctl unlock-session
has no effectsystemctl status lightdm
only reveals (harmless, expected) messages about kwallet pam module missingnopasswdlogin
group (black screen then occurs right after locking, not only after entering password)What additional steps could prove useful in figuring out how to fix this?
Debugging log:
$ export LC_ALL=C; light-locker --debug & ( sleep 5; echo "## Locking now"; light-locker-command --lock; sleep 10; echo "### 10 seconds have passed - entering password now"; sleep 10; echo "### 10 more seconds have passwd - Killing"; killall light-locker; sleep 5; echo "### Killed now" )
[1] 23463
[gs_debug_init] gs-debug.c:106 (00:08:32): Debugging enabled
[main] light-locker.c:142 (00:08:32): initializing light-locker 1.7.0
[main] light-locker.c:144 (00:08:32): lock after screensaver 10
[main] light-locker.c:145 (00:08:32): late locking 0
[main] light-locker.c:146 (00:08:32): lock on suspend 1
[main] light-locker.c:147 (00:08:32): lock on lid 0
[main] light-locker.c:148 (00:08:32): idle hint 1
[query_session_id] gs-listener-dbus.c:2088 (00:08:32): org.freedesktop.login1.NoSessionForPID raised:
PID 23463 does not belong to any known session
[init_session_id] gs-listener-dbus.c:2180 (00:08:32): Got session-id: (null)
[query_sd_session_id] gs-listener-dbus.c:2164 (00:08:32): Couldn't determine our own sd session id: No such process
[init_session_id] gs-listener-dbus.c:2185 (00:08:32): Got sd-session-id: (null)
[init_seat_path] gs-listener-dbus.c:2262 (00:08:32): Got seat: /org/freedesktop/DisplayManager/Seat0
[gs_listener_delay_suspend] gs-listener-dbus.c:449 (00:08:32): Delay suspend
[gs_listener_x11_acquire] gs-listener-x11.c:172 (00:08:32): ScreenSaver Registered
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:32): obj_path=/org/freedesktop/DBus interface=org.freedesktop.DBus method=NameAcquired destination=:1.316
## Locking now
[gs_grab_grab_root] gs-grab-x11.c:647 (00:08:37): Grabbing the root window
[gs_grab_get_keyboard] gs-grab-x11.c:153 (00:08:37): Grabbing keyboard widget=E3
[gs_grab_get_mouse] gs-grab-x11.c:213 (00:08:37): Grabbing mouse widget=E3
[gs_manager_create_windows_for_screen] gs-manager.c:548 (00:08:37): Creating 1 windows for screen 0
[gs_manager_create_window_for_monitor] gs-manager.c:324 (00:08:37): Creating window for monitor 0 [0,0] (1600x900)
[update_geometry] gs-window-x11.c:197 (00:08:37): got geometry for monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:210 (00:08:37): using geometry for monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:197 (00:08:37): got geometry for monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:210 (00:08:37): using geometry for monitor 0: x=0 y=0 w=1600 h=900
[gs_window_move_resize_window] gs-window-x11.c:243 (00:08:37): Move and/or resize window on monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:197 (00:08:37): got geometry for monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:210 (00:08:37): using geometry for monitor 0: x=0 y=0 w=1600 h=900
[gs_window_move_resize_window] gs-window-x11.c:243 (00:08:37): Move and/or resize window on monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:197 (00:08:37): got geometry for monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:210 (00:08:37): using geometry for monitor 0: x=0 y=0 w=1600 h=900
[gs_window_move_resize_window] gs-window-x11.c:243 (00:08:37): Move and/or resize window on monitor 0: x=0 y=0 w=1600 h=900
[gs_manager_timed_switch] gs-manager.c:445 (00:08:37): Start switch to greeter timer
[gs_window_xevent] gs-window-x11.c:369 (00:08:37): not raising our windows
[window_map_event_cb] gs-manager.c:233 (00:08:37): Handling window map_event event
[gs_listener_resume_suspend] gs-listener-dbus.c:513 (00:08:37): Resume suspend: fd=14
[manager_maybe_grab_window] gs-manager.c:204 (00:08:37): Moving grab to 0x5595f8d5a290
[gs_grab_move_keyboard] gs-grab-x11.c:450 (00:08:37): Moving keyboard grab from E3 to 3A0000C
[gs_grab_move_keyboard] gs-grab-x11.c:457 (00:08:37): *** doing X server grab
[gs_grab_release_keyboard] gs-grab-x11.c:279 (00:08:37): Ungrabbing keyboard
[gs_grab_get_keyboard] gs-grab-x11.c:153 (00:08:37): Grabbing keyboard widget=3A0000C
[gs_grab_move_keyboard] gs-grab-x11.c:479 (00:08:37): *** releasing X server grab
[gs_grab_move_mouse] gs-grab-x11.c:395 (00:08:37): Moving pointer grab from E3 to 3A0000C
[gs_grab_move_mouse] gs-grab-x11.c:402 (00:08:37): *** doing X server grab
[gs_grab_release_mouse] gs-grab-x11.c:320 (00:08:37): Ungrabbing pointer
[gs_grab_get_mouse] gs-grab-x11.c:213 (00:08:37): Grabbing mouse widget=3A0000C
[gs_grab_move_mouse] gs-grab-x11.c:425 (00:08:37): *** releasing X server grab
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:37): obj_path=/org/freedesktop/login1 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
[update_geometry] gs-window-x11.c:197 (00:08:37): got geometry for monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:210 (00:08:37): using geometry for monitor 0: x=0 y=0 w=1600 h=900
[gs_window_move_resize_window] gs-window-x11.c:243 (00:08:37): Move and/or resize window on monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:197 (00:08:37): got geometry for monitor 0: x=0 y=0 w=1600 h=900
[update_geometry] gs-window-x11.c:210 (00:08:37): using geometry for monitor 0: x=0 y=0 w=1600 h=900
[gs_window_move_resize_window] gs-window-x11.c:243 (00:08:37): Move and/or resize window on monitor 0: x=0 y=0 w=1600 h=900
[gs_listener_send_lock_session] gs-listener-dbus.c:180 (00:08:38): Send lock session
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:38): obj_path=(null) interface=(null) method=(null) destination=:1.316
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:39): obj_path=/org/freedesktop/login1/session/c5 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:39): obj_path=/org/freedesktop/login1/session/c12 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:39): obj_path=/org/freedesktop/login1/seat/seat0 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
process 23463: arguments to dbus_message_new_method_call() were incorrect, assertion "path != NULL" failed in file ../../dbus/dbus-message.c line 1340.
This is normally a bug in some application using the D-Bus library.
[query_session_active] gs-listener-dbus.c:1124 (00:08:39): Couldn't allocate the dbus message
[listener_dbus_handle_system_message] gs-listener-dbus.c:1361 (00:08:39): systemd notified ActiveSession 0
[listener_session_switched_cb] gs-monitor.c:298 (00:08:39): Session switched: 0
[gs_manager_stop_switch] gs-manager.c:456 (00:08:39): Stop switch to greeter timer
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:39): obj_path=/org/freedesktop/login1/seat/seat0 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:39): obj_path=/org/freedesktop/login1/session/c12 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:39): obj_path=/org/freedesktop/login1/user/_108 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:39): obj_path=/org/freedesktop/login1/seat/seat0 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
process 23463: arguments to dbus_message_new_method_call() were incorrect, assertion "path != NULL" failed in file ../../dbus/dbus-message.c line 1340.
This is normally a bug in some application using the D-Bus library.
[query_session_active] gs-listener-dbus.c:1124 (00:08:39): Couldn't allocate the dbus message
[listener_dbus_handle_system_message] gs-listener-dbus.c:1361 (00:08:39): systemd notified ActiveSession 0
[listener_session_switched_cb] gs-monitor.c:298 (00:08:39): Session switched: 0
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:39): obj_path=/org/freedesktop/login1/session/c5 interface=org.freedesktop.login1.Session method=Lock destination=(null)
### 10 seconds have passed - entering password now
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:51): obj_path=/org/freedesktop/login1/session/c5 interface=org.freedesktop.login1.Session method=Unlock destination=(null)
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:51): obj_path=/org/freedesktop/login1/session/c13 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:51): obj_path=/org/freedesktop/login1/session/c5 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
[listener_dbus_handle_system_message] gs-listener-dbus.c:1330 (00:08:51): obj_path=/org/freedesktop/login1/seat/seat0 interface=org.freedesktop.DBus.Properties method=PropertiesChanged destination=(null)
process 23463: arguments to dbus_message_new_method_call() were incorrect, assertion "path != NULL" failed in file ../../dbus/dbus-message.c line 1340.
This is normally a bug in some application using the D-Bus library.
[query_session_active] gs-listener-dbus.c:1124 (00:08:51): Couldn't allocate the dbus message
[listener_dbus_handle_system_message] gs-listener-dbus.c:1361 (00:08:51): systemd notified ActiveSession 0
[listener_session_switched_cb] gs-monitor.c:298 (00:08:51): Session switched: 0
[xroot_filter] gs-listener-x11.c:124 (00:08:52): ScreenSaver stopped
### 10 more seconds have passwd - Killing
### Killed now
Diffing this to a known-good system yields:
$ comm -3 <(grep -iv grab good | sed 's/[0-9:]\+/[NN]/g;s/[ \t]\+/ /g' | sort) <(grep -iv grab bad | sed 's/[0-9:]\+/[NN]/g;s/[ \t]\+/ /g' | sort) | head -n2
[init_session_id] gs-listener-dbus.c[NN] ([NN])[NN] Got session-id[NN] (null)
[init_session_id] gs-listener-dbus.c[NN] ([NN])[NN] Got session-id[NN] /org/freedesktop/login[NN]/session/c[NN]
And indeed, something appears to be very awkward about session setup:
$ loginctl session-status
Could not get properties: No such process
TL;DR: light-locker keeps the screen black if systemd cannot read /proc
light-locker
depends on dbus
providing IPC
.dbus
depends on systemd-logind
providing session
information.systemd-logind
depends on /proc
providing process
information.Meaning this will not work very well together:
$ file /sbin/init
/sbin/init: symbolic link to /lib/systemd/systemd
$ mount | grep proc
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime,hidepid=2,gid=1337)
And neither can be expected to:
hidepid isn't really compatible with systemd. sorry. [..] Anyway, closing as this was not caused by systemd. -- Lennart Poettering
Partial Solution 1
Partial solution, because it comes with information disclosure.
Allow unprivileged programs (such as systemd, after dropping privileges) to access other users process info in /proc
.
$ sudo mount -o remount,hidepid=0 /proc
# and fix /etc/fstab accordingly
Partial Solution 2
Partial solution, because systemd might break in other places, not just logind.
Add systemd-logind to the appropriate group, most conveniently achieved by adding a service Drop-In.
$ addgroup showpid
$ adduser myuser showpid
$ sudo mount -o remount,hidepid=2,gid=showpid /proc
# and fix /etc/fstab accordingly
$ echo -e '[Service]\nSupplementaryGroups=showpid' | sudo tee /etc/systemd/system/systemd-logind.service.d/10-showpid.conf
$ sudo systemctl daemon-reload
$ sudo systemctl restart systemd-logind
After either solution, the Got session-id: (null)
message should look more like Got session-id: /org/freedesktop/login1/c7
and light-locker will be able to communicate properly via dbus
.
What should i have done do figure this out way faster?
diff -ruiN
the whole system.이 기사는 인터넷에서 수집됩니다. 재 인쇄 할 때 출처를 알려주십시오.
침해가 발생한 경우 연락 주시기 바랍니다[email protected] 삭제
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