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!
How to set write protection to all page in Virtual memory of a process?
