LinuxQuestions.org - How to set write protection to all page in Virtual memory of a process?

Hi all,

I want to write a function that set write protection to all page in Virtual memory. I that moment, I do like that:

Code:

mm = task->mm;

spin_lock(&mm->page_table_lock);

 

for (vma = mm->mmap ; vma ; vma = vma->vm_next) {        //loop for all vmas

  vma->vm_flags, (int) vma->vm_flags & VM_WRITE);                                                

  addr = vma->vm_start;

  vma->vm_flags &= ~VM_WRITE;                

  while(addr < vma->vm_end){ //loop for each page

    pgd = pgd_offset(mm, addr);

    if (pgd_none(*pgd)) { addr += PAGE_SIZE; continue; }                

    pud = pud_offset(pgd, addr);

    if (pud_none(*pud)) { addr += PAGE_SIZE; continue; }

    pmd = pmd_offset(pud, addr);

    if (pmd_none(*pmd)) { addr += PAGE_SIZE; continue; }

    pte = pte_offset_map(pmd, addr);

    if (pte_present(*pte)){

        *pte = pte_wrprotect(*pte);

        flush_tlb_page(vma, addr);        

    } 

spin_unlock(&mm->page_table_lock);  

...........

My program work in kernel level.

But it just set write protection for a part of memory, it does't set write protection to all page that process is using.

Somebody can help me, please!