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 <khlebnikov@yandex-team.ru>
Reported-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: <stable@vger.kernel.org> [3.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index e6e0abe..eeab30f 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1056,7 +1056,7 @@
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 @@
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;