Core kernel expect swp_entry_t to be consisting of
only swap type and swap offset. We should not leak pte bits to
swp_entry_t. This breaks swapoff which use the swap type and offset
to build a swp_entry_t and later compare that to the swp_entry_t
obtained from linux page table pte. Leaking pte bits to swp_entry_t
breaks that comparison and results in us looping in try_to_unuse.
The stack trace can be anywhere below try_to_unuse() in mm/swapfile.c,
since swapoff is circling around and around that function, reading from
each used swap block into a page, then trying to find where that page
belongs, looking at every non-file pte of every mm that ever swapped.
Reported-by: Hugh Dickins <hughd@xxxxxxxxxx>
Suggested-by: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
---
Changes from V1:
* improve change log and code comment
arch/powerpc/include/asm/book3s/64/pgtable.h | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 03c1a5a21c0c..cecb971674a8 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -158,9 +158,14 @@ static inline void pgd_set(pgd_t *pgdp, unsigned long val)
#define __swp_entry(type, offset) ((swp_entry_t) { \
((type) << _PAGE_BIT_SWAP_TYPE) \
| ((offset) << PTE_RPN_SHIFT) })
-
-#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
-#define __swp_entry_to_pte(x) __pte((x).val)
+/*
+ * swp_entry_t should be independent of pte bits. We build a swp_entry_t from
+ * swap type and offset we get from swap and convert that to pte to
+ * find a matching pte in linux page table.
+ * Clear bits not found in swap entries here
+ */
+#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) & ~_PAGE_PTE })
+#define __swp_entry_to_pte(x) __pte((x).val | _PAGE_PTE)
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
#define _PAGE_SWP_SOFT_DIRTY (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE))
--
2.5.0
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