From 21d0d443cdc1658a8c1484fdcece4803f0f96d0e Mon Sep 17 00:00:00 2001 From: Andrea Arcangeli Date: Mon, 9 Aug 2010 17:19:10 -0700 Subject: [PATCH] rmap: 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 Signed-off-by: Rik van Riel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/rmap.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index f5d6799b8a7..2f855babfd0 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -364,9 +364,10 @@ vma_address(struct page *page, struct vm_area_struct *vma) */ 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; -- 2.20.1