Messages in this thread Patch in this message | | | Date | Mon, 21 Jun 2010 16:38:00 -0400 | From | Rik van Riel <> | Subject | [PATCH -mm 5/6] resurrect page_address_in_vma anon_vma check |
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From: Andrea Arcangeli <aarcange@redhat.com> Subject: resurrect page_address_in_vma anon_vma check
With root anon-vma it's trivial to keep doing the usual check as in old-anon-vma code.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Rik van Riel <riel@redhat.com> ---
diff --git a/mm/rmap.c b/mm/rmap.c --- a/mm/rmap.c +++ b/mm/rmap.c @@ -362,9 +362,10 @@ vma_address(struct page *page, struct vm */ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma) { - if (PageAnon(page)) - ; - else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) { + if (PageAnon(page)) { + if (vma->anon_vma->root != page_anon_vma(page)->root) + return -EFAULT; + } else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) { if (!vma->vm_file || vma->vm_file->f_mapping != page->mapping) return -EFAULT;
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