From 9c053068c7b8158850d680d8c96f3f11f5804367 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Tue, 13 Sep 2005 14:01:08 +0200 Subject: [PATCH] [PATCH] Fix MPOL_F_VERIFY There was a pretty bad bug in there that the code would always check the full VMA, not the range the user requested. When the VMA to be checked was merged with the previous VMA this could lead to spurious failures. Signed-off-by: Andi Kleen Signed-off-by: Chris Wright --- mm/mempolicy.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-) diff --git linux-2.6.13/mm/mempolicy.c linux-2.6.13/mm/mempolicy.c index b4eabab..54b522c 100644 --- linux-2.6.13/mm/mempolicy.c +++ linux-2.6.13/mm/mempolicy.c @@ -333,8 +333,13 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end, if (prev && prev->vm_end < vma->vm_start) return ERR_PTR(-EFAULT); if ((flags & MPOL_MF_STRICT) && !is_vm_hugetlb_page(vma)) { + unsigned long endvma = vma->vm_end; + if (endvma > end) + endvma = end; + if (vma->vm_start > start) + start = vma->vm_start; err = check_pgd_range(vma->vm_mm, - vma->vm_start, vma->vm_end, nodes); + start, endvma, nodes); if (err) { first = ERR_PTR(err); break;