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Description of problem:
The following code will cause Linux to hang--

#include <sys/types.h>
#include <unistd.h>

int main (){
    while (1) fork ();
    return (0);
}

This will exhaust the process table.

How reproducible:
Always

Steps to Reproduce:
1. write the following program as DoS.c:
#include <sys/types.h>
#include <unistd.h>

int main (){
while (1) fork ();
return (0);
}

2. compile using gcc -oDoS DoS.c

3. Run ./DoS
	

Actual Results:  X hangs, Apache won't server pages, ssh won't accept new
connections, new users cannot log in, existing users cannot execute most
shell commands.  Top hangs, and when DoS is suspended, a look at the Proc
file system indicates that well over 2000 processes are running (top won't
list it because it contains too many processes).


Expected Results:  System might slow down but it should not be possible for
an unprivaleged user to lock up the system with a malicious program.


Additional info:


Also, memory limitations per user might be harder to impliment but might be
helpful too(think of using malloc in the previous program!).