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| author | Andrea Arcangeli <aarcange@redhat.com> | 2010-08-09 17:19:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-09 20:44:59 -0700 |
| commit | 21d0d443cdc1658a8c1484fdcece4803f0f96d0e (patch) | |
| tree | 1ee41c66f24972ed427ce43780cb53efca82dcaf /mm/rmap.c | |
| parent | 288468c334e98aacbb7e2fb8bde6bc1adcd55e05 (diff) | |
| download | lwn-21d0d443cdc1658a8c1484fdcece4803f0f96d0e.tar.gz lwn-21d0d443cdc1658a8c1484fdcece4803f0f96d0e.zip | |
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 <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index f5d6799b8a74..2f855babfd06 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; |