diff options
Diffstat (limited to 'mm/mprotect.c')
| -rw-r--r-- | mm/mprotect.c | 21 |
1 files changed, 8 insertions, 13 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c index 638edabaff71..367b7f6c0637 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -123,8 +123,6 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev, unsigned long oldflags = vma->vm_flags; long nrpages = (end - start) >> PAGE_SHIFT; unsigned long charged = 0; - unsigned int mask; - pgprot_t newprot; pgoff_t pgoff; int error; @@ -176,24 +174,21 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev, } success: - /* Don't make the VMA automatically writable if it's shared, but the - * backer wishes to know when pages are first written to */ - mask = VM_READ|VM_WRITE|VM_EXEC|VM_SHARED; - if (vma->vm_ops && vma->vm_ops->page_mkwrite) - mask &= ~VM_SHARED; - - newprot = protection_map[newflags & mask]; - /* * vm_flags and vm_page_prot are protected by the mmap_sem * held in write mode. */ vma->vm_flags = newflags; - vma->vm_page_prot = newprot; + vma->vm_page_prot = protection_map[newflags & + (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]; + if (vma_wants_writenotify(vma)) + vma->vm_page_prot = protection_map[newflags & + (VM_READ|VM_WRITE|VM_EXEC)]; + if (is_vm_hugetlb_page(vma)) - hugetlb_change_protection(vma, start, end, newprot); + hugetlb_change_protection(vma, start, end, vma->vm_page_prot); else - change_protection(vma, start, end, newprot); + change_protection(vma, start, end, vma->vm_page_prot); vm_stat_account(mm, oldflags, vma->vm_file, -nrpages); vm_stat_account(mm, newflags, vma->vm_file, nrpages); return 0; |