The patch titled
From: Konstantin Khlebnikov <[email protected]>
has been added to the -mm tree. Its filename is
proc-pagemap-walk-page-tables-under-pte-lock.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-pagemap-walk-page-tables-under-pte-lock.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-pagemap-walk-page-tables-under-pte-lock.patch
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------------------------------------------------------
From: Konstantin Khlebnikov <[email protected]>
Subject: proc/pagemap: walk page tables under pte lock
Lockless access to pte in pagemap_pte_range() might race with page
migration and trigger BUG_ON(!PageLocked()) in migration_entry_to_page():
CPU A (pagemap) CPU B (migration)
lock_page()
try_to_unmap(page, TTU_MIGRATION...)
make_migration_entry()
set_pte_at()
<read *pte>
pte_to_pagemap_entry()
remove_migration_ptes()
unlock_page()
if(is_migration_entry())
migration_entry_to_page()
BUG_ON(!PageLocked(page))
Also lockless read might be non-atomic if pte is larger than wordsize.
Other pte walkers (smaps, numa_maps, clear_refs) already lock ptes.
Fixes: 052fb0d635df ("proc: report file/anon bit in /proc/pid/pagemap")
Signed-off-by: Konstantin Khlebnikov <[email protected]>
Reported-by: Andrey Ryabinin <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: <[email protected]> [3.5+]
Signed-off-by: Andrew Morton <[email protected]>
---
fs/proc/task_mmu.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff -puN fs/proc/task_mmu.c~proc-pagemap-walk-page-tables-under-pte-lock
fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~proc-pagemap-walk-page-tables-under-pte-lock
+++ a/fs/proc/task_mmu.c
@@ -1056,7 +1056,7 @@ static int pagemap_pte_range(pmd_t *pmd,
struct vm_area_struct *vma;
struct pagemapread *pm = walk->private;
spinlock_t *ptl;
- pte_t *pte;
+ pte_t *pte, *orig_pte;
int err = 0;
/* find the first VMA at or above 'addr' */
@@ -1117,15 +1117,19 @@ static int pagemap_pte_range(pmd_t *pmd,
BUG_ON(is_vm_hugetlb_page(vma));
/* Addresses in the VMA. */
- for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
+ orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
+ for (; addr < min(end, vma->vm_end); pte++, addr += PAGE_SIZE) {
pagemap_entry_t pme;
- pte = pte_offset_map(pmd, addr);
+
pte_to_pagemap_entry(&pme, pm, vma, addr, *pte);
- pte_unmap(pte);
err = add_to_pagemap(addr, &pme, pm);
if (err)
- return err;
+ break;
}
+ pte_unmap_unlock(orig_pte, ptl);
+
+ if (err)
+ return err;
if (addr == end)
break;
_
Patches currently in -mm which might be from [email protected] are
page_writeback-put-account_page_redirty-after-set_page_dirty.patch
proc-pagemap-walk-page-tables-under-pte-lock.patch
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