If you have lots of RAM available, but need to save some space on /boot with Arch Linux   when using mkinitcpio (default initramfs setup): Set MODULES_DECOMPRESS in your mkinitcpio.conf to yes.

The default zstd compression will ensure the initramfs image on /boot to be smaller than if this option were not enabled, but RAM usage may be higher when booting.

#ArchLinux  #initramfs #mkinitcpio

How can i stop update-initramfs from messing with crypttab's keyfile path? #boot #luks #initramfs #cryptsetup

https://askubuntu.com/q/1554163/612

Ubuntu stuck in busy box initramfs after a reboot #boot #dualboot #initramfs #busybox

https://askubuntu.com/q/1553851/612

Wie startet dein Linux-System und wie konfigurierst du den Boot-Prozess professionell? Genau hier kommt das Boot-Management ins Spiel – ein absolut kritischer Bereich der Linux-Administration, den du als angehender Administrator unbedingt verstehen musst.

Ohne dieses Grundverständnis stehst du bei Boot-Problemen hilflos da.

https://admindocs.de/linux-administration/linux-administration-10-boot-management-systemstart.shtml

#BootManagement #grub2 #linux #sysadmin #initramfs #linuxtutorial

New #blogpost about #initramfs and how to hijack it: https://typekmatus.blogspot.com/2025/07/initramfs-co-to-je-ako-to-zneuzit.html

#linux #initramfs

Ubuntu Security Flaw Lets Attackers Bypass Full Disk Encryption
#OMGUbuntu article: https://www.omgubuntu.co.uk/2025/07/ubuntu-security-initramfs-bypass-encryption

“Not all #Linux distributions are affected, such as #OpenSUSE_Tumbleweed.”

“#Attackers with physical access to a Linux system can access a debug shell simply by entering the wrong #decryption #password several times in a row. On Ubuntu, they hit esc at the password prompt, punch in a few key combos and debug shell appears.
They can mount a USB drive with tools that let them modify the #initramfs (Initial RAM Filesystem – a temporary system run during boot to prep the main OS) to inject #maliciouscode, and then repack it – without tripping any #security flags.
Then, the next time the owner boots up their #laptop and enters their correct password, the code runs with elevated privileges to do whatever the #attacker wants.”

“Impactful though this exploit could be in the wild, there is no reason for most #Ubuntu users to be concerned about it.
This #vulnerability is what the security industry refer to as an '#evilmaidattack': it requires physical access to a #device to pull off.”

“Finally, protecting against this #vulnerability is easy. Users can simply tweak their system #kernel so that the #computer #reboots on failed password attempts, instead of providing a #debug shell.”