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Date: Tue, 28 Jun 2011 14:54:44 -0500 From: Becky Bruce <beckyb@...nel.crashing.org> To: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org Cc: david@...son.dropbear.id.au, galak@...nel.crashing.org, wli@...omorphy.com, benh@...nel.crashing.org Subject: [PATCH 1/5] fs/hugetlbfs/inode.c: Fix pgoff alignment checking on 32-bit From: Becky Bruce <beckyb@...nel.crashing.org> This: vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT) is incorrect on 32-bit. It causes us to & the pgoff with something that looks like this (for a 4m hugepage): 0xfff003ff. The mask should be flipped and *then* shifted, to give you 0x0000_03fff. Signed-off-by: Becky Bruce <beckyb@...nel.crashing.org> --- fs/hugetlbfs/inode.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 7aafeb8..537a209 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -94,7 +94,7 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) vma->vm_flags |= VM_HUGETLB | VM_RESERVED; vma->vm_ops = &hugetlb_vm_ops; - if (vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT)) + if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) return -EINVAL; vma_len = (loff_t)(vma->vm_end - vma->vm_start); -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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