Messages in this thread Patch in this message | | | Date | Tue, 29 Nov 2005 16:53:56 +0000 (GMT) | From | Hugh Dickins <> | Subject | [PATCH 2/4] pfnmap: cow_user_page needs mask |
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The fault address to cow_user_page is not usually page aligned, so needs to be masked in the unusual case when that copies via the user address.
Signed-off-by: Hugh Dickins <hugh@veritas.com> ---
mm/memory.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletion(-)
--- 2.6.15-rc3/mm/memory.c 2005-11-29 08:40:07.000000000 +0000 +++ linux/mm/memory.c 2005-11-29 15:59:34.000000000 +0000 @@ -1300,7 +1313,8 @@ static inline void cow_user_page(struct */ if (unlikely(!src)) { void *kaddr = kmap_atomic(dst, KM_USER0); - unsigned long left = __copy_from_user_inatomic(kaddr, (void __user *)va, PAGE_SIZE); + unsigned long left = __copy_from_user_inatomic(kaddr, + (void __user *)(va & PAGE_MASK), PAGE_SIZE); if (left) memset(kaddr, 0, PAGE_SIZE); kunmap_atomic(kaddr, KM_USER0); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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