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Destructive fun with Linux
I've just rebuilt the server at home, and I was wondering how much fun you can have trashing a Linux system.
As root, try this:
> cd /
> rm -rf *
Has anyone managed to wipe out the entire filesystem (best set the immutable flag on rm) and still keep the system running?
I managed to wipe out 98% (I'm guessing, but there wasn't much left) of the system before I accidentally wiped the rm command.
Anyone else got some fun (destructive) commands no-one should ever try on a production system?
How about echoing /dev/random into the swap partition on a running system? Or dd'ing random data to /dev/hda? Any other ideas?
James
Last edited by Satanic Atheist; 09-03-2003 at 09:40 AM.
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perl -e 'use Math::Complex;$|=1;for$r(0..24){for$c (0..79){$C=cplx(($c/20.0)-3.0,-($r/12.0)+1.0);$Z= cplx(0,0);for($i=0;($i<80)&&(abs($Z)<2.0);$i++){$Z =$Z*$Z+$C;}print$i>=80?"*":" ";}print"\n";}'
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OK. I did it.
> echo /dev/random > /dev/mem
Wanna know what happened?
Nothing. Absolutely Zip.
I also tried:
> echo /dev/random > /dev/hda5
Which also managed to do nothing. That's the swap partition by the way.
I would've expected a kernel panic or something.
James
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UseLinux.net
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perl -e 'use Math::Complex;$|=1;for$r(0..24){for$c (0..79){$C=cplx(($c/20.0)-3.0,-($r/12.0)+1.0);$Z= cplx(0,0);for($i=0;($i<80)&&(abs($Z)<2.0);$i++){$Z =$Z*$Z+$C;}print$i>=80?"*":" ";}print"\n";}'
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try rm -rf * with other network drives mounted. that can be fun.....
Have you ever thought that while you're killing time, time is returning the favor?
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Isn't satanic atheist an oxymoron?
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Folding is Fun
I thought I made a mistake once, but, of course, I was mistaken. 
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I only wanted to kill one machine, not the network (although there are a few users I wouldn't mind killing off!).
Next time I have my laptop powered up, I'll rig it to the network and share the Windows partition and try it. Hope those tapes still work...
Yes - Satanic Atheist is an oxymoron, and I coined the name to cause mischief in religious chat rooms (great fun - how to make the God Squad swear at you).
Does anyone know how to start rewriting random parts of the memory on a running system to crash it badly?
James
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UseLinux.net
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perl -e 'use Math::Complex;$|=1;for$r(0..24){for$c (0..79){$C=cplx(($c/20.0)-3.0,-($r/12.0)+1.0);$Z= cplx(0,0);for($i=0;($i<80)&&(abs($Z)<2.0);$i++){$Z =$Z*$Z+$C;}print$i>=80?"*":" ";}print"\n";}'
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Originally posted by Satanic Atheist
Does anyone know how to start rewriting random parts of the memory on a running system to crash it badly?
James
Well, i'm unsure, but I suppose you could try writing to /proc/kcore, but I doubt it will let you (I think it's read only).
using the cat function is always fun... for example as root:
Code:
cat /proc/kcore > /dev/dsp
cat /dev/random > /dev/dsp
Make sure the volume is WAY up!!
Of course, you can always do insane things like rm vmlinuz and then reboot.
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try:
dd if=/dev/urandom of=/dev/kmem bs=1k count=128000
That should put 128MB of random values into /dev/kmem. Try /dev/mem as well. I'm going to try all of these just before I reinstall Does anyone know what it sounds like if you cat /dev/zero or /dev/null to /dev/dsp?
cat /dev/random > /dev/dsp
Best be careful, do that for long enough and you might hear a copyrighted song
Registered Linux User #325947
Check out Feather Linux, my distro.
(Yes, it's shameless self promotion, deal with it  )
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Deleting vmlinuz is a boring way to kill a machine. Effective, but boring.
Rerouting /dev/random into the audio mixer. Hmmm.
What about doing the same to /dev/video and pretending you're on a power trip?
This is gonna be fun...
James
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UseLinux.net
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perl -e 'use Math::Complex;$|=1;for$r(0..24){for$c (0..79){$C=cplx(($c/20.0)-3.0,-($r/12.0)+1.0);$Z= cplx(0,0);for($i=0;($i<80)&&(abs($Z)<2.0);$i++){$Z =$Z*$Z+$C;}print$i>=80?"*":" ";}print"\n";}'
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Would "mv /proc/*** /etc" and/or "mv /etc/**** /proc" do anything? And how about "cat /usr/*** > /root?
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think it'd let you echo or cat /dev/random to the kernel or vmlinuz?
Have you ever thought that while you're killing time, time is returning the favor?
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Originally posted by Satanic Atheist
OK. I did it.
> echo /dev/random > /dev/mem
Wanna know what happened?
Nothing. Absolutely Zip.
I've never looked at that part of /dev before, but I'd assume that it did nothing because the kernel is in charge of seeing that each process has it's own memory space. It makes sense then that nothing happened; the process that command was running under (or whatever) would have had random values piped into it, but not the rest of the system.
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I know that everybody is entitled to their own opinion and everyone has their own prerogative obviously, but why don't you do something productive with your time instead of breaking stuff. Just a suggestion.
EVAC
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Because breaking things helps you learn
Anyway, I'm only going to do this stuff just before a reinstall, so there's no harm done.
How can you resist not creating funny sounds from /dev/urandom?
Registered Linux User #325947
Check out Feather Linux, my distro.
(Yes, it's shameless self promotion, deal with it )
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breaking stuff is more fun, hence a better way to learn. break it then learn to fix it...
Have you ever thought that while you're killing time, time is returning the favor?
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A Philosophical Side Note...
I always learned more by fixing things that are broke but not necessarily intentionally broken. I have also learned much more by creating things and making mistakes and learning from my mistakes (rather than destroying). There are somethings that you test the reliability of using a controlled system instead of a choatic system. Would you take a beautifully designed antique vase and break it by throwing it off a building? Or would you crash a brand new Porsche into a ditch? There is absolutely nothing to gain in these exercises unless you are actually testing the reliability of something else.
Again that is just my opinion 
EVAC
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