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Posts by Matthias Braun‭

11 posts
66%
+2 −0
Q&A How to show motherboard model?

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

posted 14d ago by Matthias Braun‭  ·  edited 14d ago by Matthias Braun‭

Answer
71%
+3 −0
Q&A Why is 32768-60999 the default for local/ephemeral ports?

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 17d ago by Matthias Braun‭  ·  edited 14d ago by Michael‭

Question networking ports
60%
+1 −0
Q&A How is the IPv6 link-local address calculated?

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 10mo ago by Matthias Braun‭  ·  edited 10mo ago by Matthias Braun‭

Answer
66%
+2 −0
Q&A How is the IPv6 link-local address calculated?

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 11mo ago by Matthias Braun‭  ·  last activity 10mo ago by Matthias Braun‭

Question networking ipv6
75%
+4 −0
Q&A Debug NetworkManager with GDB

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 11mo ago by Matthias Braun‭  ·  edited 5mo ago by Matthias Braun‭

Answer
75%
+4 −0
Q&A Debug NetworkManager with GDB

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 11mo ago by Matthias Braun‭  ·  last activity 5mo ago by Matthias Braun‭

71%
+3 −0
Q&A Close all desktop notifications

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 2y ago by Matthias Braun‭  ·  edited 2y ago by Matthias Braun‭

Answer
75%
+4 −0
Q&A Close all desktop notifications

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 2y ago by Matthias Braun‭  ·  last activity 13d ago by Quasímodo‭

Question libnotify
77%
+5 −0
Q&A Reverse shell with named pipe and netcat

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 2y ago by Matthias Braun‭  ·  last activity 11mo ago by Kamil Maciorowski‭

Question shell networking
77%
+5 −0
Q&A Get current server of pacman

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

Answer
71%
+3 −0
Q&A Get current server of pacman

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

Question arch-linux