Matthias Braun‭

with pacman --debug We can display the mirrors that pacman uses with the --debug option. For example, when running pacman --debug -Sy, pacman will write lines like these to standard error: debug...

posted 3y ago by Matthias Braun‭  ·  edited 3y ago by Matthias Braun‭

This blog post describes a privilege escalation, exploiting tar's --checkpoint-action option. The privilege escalation is used to solve a TryHackMe challenge. The root user calls tar via cron whi...

1 answer  ·  posted 3y ago by Matthias Braun‭  ·  last activity 1y ago by Kamil Maciorowski‭

I'd like to hide/dismiss/remove all the notifications that applications like Signal have created. I know I can create notifications with, for example, notify-send -t 10000 "🤖 Here goes my message"...

1 answer  ·  posted 3y ago by Matthias Braun‭  ·  last activity 7mo ago by Quasímodo‭

I'd like to debug NetworkManager by stepping through it using GDB. I assume I'll have to compile NetworkManager from source to get debug symbols since file /usr/bin/NetworkManager indicates that th...

1 answer  ·  posted 1y ago by Matthias Braun‭  ·  last activity 11mo ago by Matthias Braun‭

Note that if you want to debug the currently installed version of NetworkManager, you don't have to compile NetworkManager yourself. Instead, make GDB download symbol files via debuginfod. You can ...

posted 1y ago by Matthias Braun‭  ·  edited 11mo ago by Matthias Braun‭

How do I get the URL of the remote repository that pacman uses to download packages? I know that I can tell pacman which server to use by editing /etc/pacman.d/mirrorlist. But in my case, all of t...

1 answer  ·  posted 3y ago by Matthias Braun‭  ·  edited 3y ago by Matthias Braun‭

While there doesn't seem to be a general command like notify-send to hide all notifications, we can use features of our specific notification daemon, like mako in this case, to hide all notificatio...

posted 3y ago by Matthias Braun‭  ·  edited 3y ago by Matthias Braun‭

The local port range on my Arch Linux installation is 32768-60999 according to cat /proc/sys/net/ipv4/ip_local_port_range Wikipedia states that this range is "used by many Linux kernels" and th...

0 answers  ·  posted 7mo ago by Matthias Braun‭  ·  edited 7mo ago by Michael‭

I was told that an IPv6 link-local address — typically starting with fe80:: — is derived from the interface's MAC address. Here are some instruction on how to do the conversion. But the conversion...

1 answer  ·  posted 1y ago by Matthias Braun‭  ·  last activity 1y ago by Matthias Braun‭

Try reading the files in /sys/class/dmi/id/, some of them don't require root privileges. For example: board_name board_vendor

posted 7mo ago by Matthias Braun‭  ·  edited 7mo ago by Matthias Braun‭

It's NetworkManager that sets the IPv6 link-local address and per default it doesn't use the conversion from MAC to IPv6 address of that converter, called modified EUI-64. As mentioned in the linke...

posted 1y ago by Matthias Braun‭  ·  edited 1y ago by Matthias Braun‭