On 04/22/2010 10:08 PM, Naoya Horiguchi wrote:
Currently page_address_in_vma() compares vma->anon_vma and page_anon_vma(page) for parameter check, but in 2.6.34 a vma can have multiple anon_vmas with anon_vma_chain, so current check does not work. (For anonymous page shared by multiple processes, some verified (page,vma) pairs return -EFAULT wrongly.) We can go to checking all anon_vmas in the "same_vma" chain, but it needs to meet lock requirement. Instead, we can remove anon_vma check safely because page_address_in_vma() assumes that page and vma are already checked to belong to the identical process. Signed-off-by: Naoya Horiguchi<n-horiguchi@xxxxxxxxxxxxx> Cc: Andrew Morton<akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Rik van Riel<riel@xxxxxxxxxx> Cc: Andi Kleen<andi@xxxxxxxxxxxxxx>
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