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From stable-bounces@linux.kernel.org Tue Sep 13 05:01:26 2005
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From: Andi Kleen <ak@suse.de>
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To: stable@kernel.org
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Date: Tue, 13 Sep 2005 14:01:08 +0200
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Cc: linux-kernel@vger.kernel.org
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Subject: [PATCH] Fix MPOL_F_VERIFY
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There was a pretty bad bug in there that the code would
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always check the full VMA, not the range the user requested.
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When the VMA to be checked was merged with the previous VMA this
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could lead to spurious failures.
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Signed-off-by: Andi Kleen <ak@suse.de>
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Signed-off-by: Chris Wright <chrisw@osdl.org>
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---
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mm/mempolicy.c | 7 ++++++-
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1 files changed, 6 insertions(+), 1 deletion(-)
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Index: linux-2.6.13.y/mm/mempolicy.c
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===================================================================
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--- linux-2.6.13.y.orig/mm/mempolicy.c
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+++ linux-2.6.13.y/mm/mempolicy.c
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@@ -333,8 +333,13 @@ check_range(struct mm_struct *mm, unsign
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if (prev && prev->vm_end < vma->vm_start)
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return ERR_PTR(-EFAULT);
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if ((flags & MPOL_MF_STRICT) && !is_vm_hugetlb_page(vma)) {
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+ unsigned long endvma = vma->vm_end;
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+ if (endvma > end)
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+ endvma = end;
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+ if (vma->vm_start > start)
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+ start = vma->vm_start;
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err = check_pgd_range(vma->vm_mm,
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- vma->vm_start, vma->vm_end, nodes);
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+ start, endvma, nodes);
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if (err) {
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first = ERR_PTR(err);
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break;
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