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Commit 5b952b3c authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

[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: default avatar"Andi Kleen" <ak@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8d0986e2

mm/mempolicy.c

+6 −1
Original line number Diff line number Diff line
@@ -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;