Strange problem during logout from Ubuntu

mackowiakp · 02-13-2024, 04:33 PM

Below telnet session of login/logout from Mageia tu Ubuntu

Code:

[maciek@Piotr ~]$ telnet nano
Trying 192.168.0.25...
Connected to nano.
Escape character is '^]'.
Ubuntu 16.04.7 LTS
NanoPi-NEO login: nano
Password: 
nano@NanoPi-NEO:~$ ls -la
total 36
drwxr-xr-x 4 nano nano 4096 lut 13 00:58 .
drwxr-xr-x 5 root root 4096 lut 12 00:41 ..
-rw------- 1 nano nano  502 lut 13 01:47 .bash_history
-rw-r--r-- 1 nano nano  220 wrz  1  2015 .bash_logout
-rw-r--r-- 1 nano nano 3771 wrz  1  2015 .bashrc
drwx------ 2 nano nano 4096 lut 12 00:47 .cache
-rw-rw-r-- 1 nano nano    0 lut 13 00:31 .hushlogin
-rw-r--r-- 1 nano nano  655 cze 24  2016 .profile
drwx------ 2 nano nano 4096 sie 18  2022 .ssh
-rw-r--r-- 1 nano nano    0 lut 13 00:32 .sudo_as_admin_successful
-rw------- 1 nano nano  782 lut 12 23:53 .viminfo
nano@NanoPi-NEO:~$ logout
mount: only root can use "--options" option
Connection closed by foreign host.

As you can see, during logout the "mount" command signals an error.
The problem is that none of the files in the user's home directory (which are listed) contain the "mount" command.
So it must be something globally defined.
The problem does not occur during SSH sessions, only during TELNET sessions.
Does anyone out there know the reason? Any idea?

I explain that I use telnet daemon on Ubuntu installed on RPi because it is a "last resort solution" for me. I normally use SSH.
The system is installed on eMMC (not on SD-card) and once I damaged the SSH configuration, which made it impossible to log in to the system.So I had to reinstall the system

hazel · 02-14-2024, 10:42 AM

What does .bash_logout contain?

pan64 · 02-14-2024, 10:43 AM

probably different init scripts are used with telnet and ssh.
There is a .bash_logout, probably you can find something related in it.

mackowiakp · 02-14-2024, 03:35 PM

Below content of .bash_logout file:

Code:

root@NanoPi-NEO:/home/nano# cat .bash_logout 
# ~/.bash_logout: executed by bash(1) when login shell exits.

# when leaving the console clear the screen to increase privacy

if [ "$SHLVL" = 1 ]; then
    [ -x /usr/bin/clear_console ] && /usr/bin/clear_console -q
fi

I deleted the .bash_logout file but this strange message with "mount" still appears.
This file was created automatically during creation of user using /etc located defaults.

MadeInGermany · 02-15-2024, 12:36 AM

Is there a
/etc/bash.bash_logout
at the remote side?
Is there a
.telnetrc
at the local side?

mackowiakp · 02-15-2024, 01:11 AM

Quote:

Is there a
/etc/bash.bash_logout
at the remote side?

Yes

Quote:

s there a
.telnetrc
at the local side?

No

hazel · 02-15-2024, 01:28 AM

What does the remote /etc/bash.bash_logout contain?

mackowiakp · 02-15-2024, 01:34 AM

OMG !!!

Code:

root@NanoPi-NEO:~# cat /etc/bash.bash_logout 
/bin/mount -o remount,ro /boot

MadeInGermany · 02-15-2024, 04:14 AM

Provided that mount command ever makes sense,
move it to root's .bash_logout