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Date: Fri, 6 Mar 2015 09:56:32 +0000 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>, Hugh Dickins <hughd@...gle.com>, James Hogan <james.hogan@...tec.com>, David Rientjes <rientjes@...gle.com>, Mel Gorman <mel@....ul.ie>, Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...e.cz>, Rik van Riel <riel@...hat.com>, Andrea Arcangeli <aarcange@...hat.com>, Luiz Capitulino <lcapitulino@...hat.com>, Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>, Lee Schermerhorn <lee.schermerhorn@...com>, Steve Capper <steve.capper@...aro.org>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 3.16.y-ckt 101/183] mm/hugetlb: add migration/hwpoisoned entry check in hugetlb_change_protection 3.16.7-ckt8 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Naoya Horiguchi <n-horiguchi@...jp.nec.com> commit a8bda28d87c38c6aa93de28ba5d30cc18e865a11 upstream. There is a race condition between hugepage migration and change_protection(), where hugetlb_change_protection() doesn't care about migration entries and wrongly overwrites them. That causes unexpected results like kernel crash. HWPoison entries also can cause the same problem. This patch adds is_hugetlb_entry_(migration|hwpoisoned) check in this function to do proper actions. Fixes: 290408d4a2 ("hugetlb: hugepage migration core") Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com> Cc: Hugh Dickins <hughd@...gle.com> Cc: James Hogan <james.hogan@...tec.com> Cc: David Rientjes <rientjes@...gle.com> Cc: Mel Gorman <mel@....ul.ie> Cc: Johannes Weiner <hannes@...xchg.org> Cc: Michal Hocko <mhocko@...e.cz> Cc: Rik van Riel <riel@...hat.com> Cc: Andrea Arcangeli <aarcange@...hat.com> Cc: Luiz Capitulino <lcapitulino@...hat.com> Cc: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com> Cc: Lee Schermerhorn <lee.schermerhorn@...com> Cc: Steve Capper <steve.capper@...aro.org> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- mm/hugetlb.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 9508a818f496..5aab37914cbd 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3392,7 +3392,26 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, spin_unlock(ptl); continue; } - if (!huge_pte_none(huge_ptep_get(ptep))) { + pte = huge_ptep_get(ptep); + if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) { + spin_unlock(ptl); + continue; + } + if (unlikely(is_hugetlb_entry_migration(pte))) { + swp_entry_t entry = pte_to_swp_entry(pte); + + if (is_write_migration_entry(entry)) { + pte_t newpte; + + make_migration_entry_read(&entry); + newpte = swp_entry_to_pte(entry); + set_huge_pte_at(mm, address, ptep, newpte); + pages++; + } + spin_unlock(ptl); + continue; + } + if (!huge_pte_none(pte)) { pte = huge_ptep_get_and_clear(mm, address, ptep); pte = pte_mkhuge(huge_pte_modify(pte, newprot)); pte = arch_make_huge_pte(pte, vma, NULL, 0); -- 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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