This happend to me right noww as I tried to write a gui task manager for the GNU/Linux OS
this post was submitted on 20 Sep 2024
201 points (96.3% liked)
Programmer Humor
32061 readers
1074 users here now
Post funny things about programming here! (Or just rant about your favourite programming language.)
Rules:
- Posts must be relevant to programming, programmers, or computer science.
- No NSFW content.
- Jokes must be in good taste. No hate speech, bigotry, etc.
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
How are you crashing your system?! Crashing program sure, but the entire system?
Try it out on your own system.
It's totally possible
Doesn't explain OPs task management example. And won't crash the kernel, just make things unresponsive
it didn't crash the kernel, it just killed every process that isn't run by the root user, which kind of feels like a crash
Ah, that definitely would feel like a crash. Sent kill signal to cgroup accidentally? Or just iterate over all processes and signal them all?
probably the later, but idk how, all I did was insert a string in the following command like this:
``Command::new("bash")
.arg("-c") .arg(format!("ps -aux | grep -i "{}" | awk '{{print $2}}' | xagrs kill -9", input)
.output()
.expect("error");``
I've tested the command and it worked flawlessly in the terminal, but I have no idea what I'm doing, since I'm new to rust and never worked with this library
There are rust libraries to send signals, might be better to use those rather than calling bash. eg. https://docs.rs/nix/latest/nix/sys/signal/index.html
I'm guessing if input was "", then it would sigkill all processes? Less confident, but some functions behave slightly differently in an interactive console vs a non interactive, maybe
pshas a different format when used non interactively?thx, btw I figured it out:
I forgot to trimm the string, so it had a line break in it which lead to grep showing the processes from the term I put in + all processes that contain a space/linebreak and appearently all processes shown by ps aux contain some kind of space (makes sense, since there are spaces between the user, pid, etc) so yeah, I ended up trying to kill every process on the system, but it only killed the user processes, since I ran everything without sudo
Works for
.current directory. Yay!... also works for
/system root. 🔥 Nay!Does it? I thought / specifically was protected, and you needed to add --no-preserve-root.
It should, but I the end it depends on your system. Each distro has their own default behavior.
That won't crash your kernel, and I was more curious about the OPs example. Task management is basically reading some files, and sending signals, it should be near impossible to crash the system.
A high level explanation
OPs example was task management, which doesn't require kernel modules.