#include <linux/init.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/mm.h>
#include <linux/mm_types.h>
#include <linux/sched.h>
static void list_myvma(void)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
printk("list vma..\n");
//print the current process's name and pid
printk("current:%s pid:%d\n",current->comm,current->pid);
down_read(&mm->mmap_sem);
//vma is a linklist
for(vma = mm->mmap; vma; vma = vma->vm_next)
{
//from the begining to the ending of a virtual memory area
printk("0x%lx-0x%lx ",vma->vm_start,vma->vm_end);
//check the flags of this VMA
if(vma->vm_flags & VM_READ)
printk("r");
else
printk("-");
if(vma->vm_flags & VM_WRITE)
printk("w");
else
printk("-");
if(vma->vm_flags & VM_EXEC)
printk("x");
else
printk("-");
if(vma->vm_flags & VM_SHARED)
printk("s");
else
printk("p");
printk("\n");
}
up_read(&mm->mmap_sem);
}
static int __init mymem_init(void)
{
printk("mymem module is working..\n");
list_myvma();
return 0;
}
static void __exit mymem_exit(void)
{
printk("mymem module is leaving..\n");
}
MODULE_LICENSE("GPL");
module_init(mymem_init);
module_exit(mymem_exit);
