read kernel buffer failed

[Ed_P]

Code: Select all

guest@porteus:~$ dmesg
dmesg: read kernel buffer failed: Operation not permitted
guest@porteus:~$ 

What does that mean? Why am I getting it?

Code: Select all

~#  uname -a
Linux porteus.example.net 6.6.20-porteus #1 SMP PREEMPT_DYNAMIC Tue Mar  5 20:06:09 MSK 2024 x86_64 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz GenuineIntel GNU/Linux

~#  cat /etc/porteus/*
001-core.xzm:20240301
002-xorg.xzm:20240301
002-xtra.xzm:20240301
003-cinnamon.xzm:20231229
initrd.xz:20230923

~#  ls -l /mnt/live/memory/images
000-kernel.xzm : Mar 5 12:26
001-core.xzm : Mar 1 06:24
002-xorg.xzm : Mar 1 06:29
002-xtra.xzm : Mar 1 06:34
003-cinnamon.xzm : Dec 29 00:05
07-printing-x86_64-2023-02-04.xzm : Feb 4 2023
Dell6.4.10-wifi.xzm : Aug 18 2023
Dellsound.xzm : May 14 2022
changes : Apr 19 21:17
firefox-122.0-x86_64-en-US.xzm : Jan 27 23:51
wmctrl-1.07-x86_64-2salix15.0.xzm : Feb 6 11:54

ISO: /ISOs/Porteus/Porteus-CINNAMON-v5.01-x86_64.iso

[Blaze]

Run dmesg as root user

[Ed_P]

Oh, Wow!! I thought the error was what I saw flashing by when I booted. Did not connect it to dmesg itself.

Thank you Blaze.

[i3slkiller]

You can also do this:

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sudo sysctl -w kernel.dmesg_restrict=0

then root is not required for dmesg

[Ed_P]

Code: Select all

sudo sysctl -w kernel.dmesg_restrict=0

then root is not required for dmesg

Code: Select all

guest@porteus:~$ sudo sysctl -w kernel.dmesg_restrict=0

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

For security reasons, the password you type will not be visible.

Password: 
kernel.dmesg_restrict = 0

guest@porteus:~$ dmesg
[    0.000000] Linux version 6.6.13-porteus (root@porteus.example.net) (gcc (GCC) 13.2.0, GNU ld version 2.41-slack151) #1 SMP PREEMPT_DYNAMIC Mon Jan 22 18:56:22 AEST 2024
[    0.000000] Command line: BOOT_IMAGE=(loop)/boot/syslinux/vmlinuz from=/ISOs/Porteus/Porteus-CINNAMON-v5.1-x86_64.iso volume=33 reboot=cold extramod=/porteus5.0/Modules noload=kde;jinn;lxqt;xfce;lxde;mate;open;dat.xzm;menu2
[    0.000000] x86/split lock detection: #AC: crashing the kernel on kernel split_locks and warning on user-space split_locks
[    0.000000] BIOS-provided physical RAM map:
 :
 :
 :

Definitely effective.

Thanks i3slkiller.