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Activity for Matthias Braun‭

Type On... Excerpt Status Date
Edit Post #291389 Post edited:
wording
about 1 month ago
Edit Post #291389 Initial revision about 1 month ago
Answer 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: `boardname` `boardvendor`
(more)
about 1 month ago
Edit Post #291379 Post edited:
Punctuation
about 2 months ago
Edit Post #291379 Initial revision about 2 months ago
Question 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/iplocalportrange [Wikipedia][] states that this range is "used by many Linux kernels" and the kernel documentation says it's the default range. I'm especially interested in the reason fo...
(more)
about 2 months ago
Edit Post #288926 Post edited:
grammar
6 months ago
Edit Post #288926 Post edited:
fix typos, try to improve wording
6 months ago
Edit Post #288926 Post edited:
Extend explanations, add screenshot of example session
11 months ago
Edit Post #288930 Post edited:
fix grammar in script
11 months ago
Edit Post #288929 Post edited:
grammar
11 months ago
Edit Post #288930 Post edited:
fix path
11 months ago
Edit Post #288930 Post edited:
fix wording
11 months ago
Edit Post #288930 Post edited:
Fix path to NetworkManager's secret key file
11 months ago
Edit Post #288930 Post edited:
fix typos
11 months ago
Edit Post #288930 Post edited:
fix spelling
11 months ago
Edit Post #288930 Initial revision 11 months ago
Answer 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 linked Wikipedia article, EUI-64 is deprecated for privacy and security reasons. Instead of EUI-64, Networ...
(more)
11 months ago
Edit Post #288929 Initial revision 11 months ago
Question 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 result doesn't match my actual IPv6 link-local address according to `ip a`. My IPv6 link-local addr...
(more)
11 months ago
Edit Post #288926 Post edited:
Remove mysterious parentheses at end of post
11 months ago
Edit Post #288926 Post edited:
spelling
11 months ago
Edit Post #288926 Post edited:
fix section title, fix formatting
11 months ago
Edit Post #288926 Initial revision 11 months ago
Answer 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 skip to section "Debug NetworkManager with GDB" of this answer to see how. Clone, configure, and co...
(more)
11 months ago
Edit Post #288925 Initial revision 11 months ago
Question 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 the binary is stripped, having no debug symbols. I'm on Arch Linux and I can see that systemd starts ...
(more)
11 months ago
Comment Post #288009 I'd use `find` to visit all files, calling [`file --mime-type`](https://stackoverflow.com/questions/2227182/how-can-i-find-out-a-files-mime-type-content-type) to get the file type and then aggregate the data with `awk` as shown [here](https://askubuntu.com/questions/558979/how-to-display-disk-usage-b...
(more)
about 1 year ago
Edit Post #282891 Post edited:
trying to improve grammar
over 2 years ago
Edit Post #284556 Post edited:
spelling, grammar
over 2 years ago
Edit Post #284556 Initial revision over 2 years ago
Answer 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 notifications: makoctl dismiss --all []()
(more)
over 2 years ago
Edit Post #284555 Initial revision over 2 years ago
Question 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"`. But is there an opposite command, that removes notifications? I read about `org.freedesktop.Not...
(more)
over 2 years ago
Suggested Edit Post #282891 Suggested edit:
trying to improve grammar
(more)
helpful over 2 years ago
Edit Post #283879 Post edited:
fix post
almost 3 years ago
Edit Post #283879 Initial revision almost 3 years ago
Question 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` which causes a script with the following content to run (I adapted the script a bit): rm /...
(more)
almost 3 years ago
Edit Post #282817 Post edited:
wording
almost 3 years ago
Edit Post #282818 Post edited:
improve grammar, remove leftovers of a markdown link
almost 3 years ago
Edit Post #282818 Post edited:
almost 3 years ago
Edit Post #282818 Post edited:
explain |&
almost 3 years ago
Edit Post #282818 Initial revision almost 3 years ago
Answer 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: core.db: url is http://mirrors.kernel.org/archlinux/core/os/x8664/core.db We can ...
(more)
almost 3 years ago
Edit Post #282817 Initial revision almost 3 years ago
Question 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 the lines are commented out and given that a command like `pacman -Syu` still works, I'm wondering wh...
(more)
almost 3 years ago