/* (C) 2002 Kasper Dupont <kasperd@daimi.au.dk>
 * This module may be used under the terms of
 * GPL version 2. This module can be used to
 * enable core dumps for suid executables, this
 * can be handy for debugging certain tricky
 * problems. USE WITH CARE, careless usage will
 * lead to security problems.
 */

#ifndef __KERNEL__
#define __KERNEL__
#endif
#ifndef MODULE
#define MODULE
#endif

/* FIXME: remove unneeded includes */
#include <linux/module.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <asm/uaccess.h>
#include <assert.h>
#include <asm/uaccess.h>
#include <linux/config.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/types.h>
#include <linux/unistd.h>

static int pid = 0;
MODULE_PARM(pid,"i");

static int __init __dumpable_init()
{
  struct task_struct *p;
  struct mm_struct *mm;
  int wasdumpable;
  if (pid<1) {
    printk("You must specify pid=\n");
    return -EINVAL;
  }
  read_lock(&tasklist_lock);
  p = find_task_by_pid(pid);
  if (p) {
    mm=p->mm;
    if (mm) {
      wasdumpable=mm->dumpable;
      mm->dumpable=1;
    }
  }
  read_unlock(&tasklist_lock);
  if (!p) {
    printk("Process %d does not exist.\n",pid);
    return -ESRCH;
  }
  if (!mm) {
    printk("Process %d looks like a kernel thread.\n",pid);
    return -ENOMEM;
  };
  if (wasdumpable) {
    printk("Process %d was already dumpable.\n",pid);
    return -EEXIST;
  }
  printk("Process %d is now dumpable.\n",pid);
  return -EBUSY;
}

module_init(__dumpable_init);