edit file
usr/src/linux/kernel/fork.c

add the following.

int disfork=0;

SYSCALL_DEFINE0(nofork){

printk("ForkaDISABLEDaCAlled");
return disfork = (disfork==0)? 1 : 0;

}

long do_fork(unsigned long clone_flags,
              unsigned long stack_start,
              struct pt_regs *regs,
              unsigned long stack_size,
              int __user *parent_tidptr,
              int __user *child_tidptr)
{
        struct task_struct *p;
        int trace = 0;
        long nr;
        if ( disfork) return -EPERM;

--------

then goto that syscall file and at 283 just like in the other lab make it ref nofork instead.


--c program does library call

#include <unistd.h>
#include <stdio.h>
#include <sys/syscall.h>
#define NOFORK 283
int main(int argc, char **argv){
syscall(NOFORK);
return 0;
}