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khugepaged: retract_page_tables() remember to test exit

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commit 18e77600f7a1ed69f8ce46c9e11cad0985712dfa upstream.

Only once have I seen this scenario (and forgot even to notice what forced
the eventual crash): a sequence of "BUG: Bad page map" alerts from
vm_normal_page(), from zap_pte_range() servicing exit_mmap();
pmd:00000000, pte values corresponding to data in physical page 0.

The pte mappings being zapped in this case were supposed to be from a huge
page of ext4 text (but could as well have been shmem): my belief is that
it was racing with collapse_file()'s retract_page_tables(), found *pmd
pointing to a page table, locked it, but *pmd had become 0 by the time
start_pte was decided.

In most cases, that possibility is excluded by holding mmap lock; but
exit_mmap() proceeds without mmap lock.  Most of what's run by khugepaged
checks khugepaged_test_exit() after acquiring mmap lock:
khugepaged_collapse_pte_mapped_thps() and hugepage_vma_revalidate() do so,
for example.  But retract_page_tables() did not: fix that.

The fix is for retract_page_tables() to check khugepaged_test_exit(),
after acquiring mmap lock, before doing anything to the page table.
Getting the mmap lock serializes with __mmput(), which briefly takes and
drops it in __khugepaged_exit(); then the khugepaged_test_exit() check on
mm_users makes sure we don't touch the page table once exit_mmap() might
reach it, since exit_mmap() will be proceeding without mmap lock, not
expecting anyone to be racing with it.

Fixes: f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages")
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: <stable@vger.kernel.org>	[4.8+]
Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2008021215400.27773@eggly.anvils
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hugh Dickins 2020-08-06 23:26:22 -07:00 committed by Adithya R
parent 9a0ad9edbe
commit 334da6a3da
1 changed files with 13 additions and 9 deletions
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22
mm/khugepaged.c
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@ -1257,6 +1257,7 @@ static void collect_mm_slot(struct mm_slot *mm_slot)
static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
{
struct vm_area_struct *vma;
struct mm_struct *mm;
unsigned long addr;
pmd_t *pmd, _pmd;
@ -1270,7 +1271,8 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
continue;
if (vma->vm_end < addr + HPAGE_PMD_SIZE)
continue;
pmd = mm_find_pmd(vma->vm_mm, addr);
mm = vma->vm_mm;
pmd = mm_find_pmd(mm, addr);
if (!pmd)
continue;
/*
@ -1279,14 +1281,16 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
* re-fault. Not ideal, but it's more important to not disturb
* the system too much.
*/
if (down_write_trylock(&vma->vm_mm->mmap_sem)) {
spinlock_t *ptl = pmd_lock(vma->vm_mm, pmd);
/* assume page table is clear */
_pmd = pmdp_collapse_flush(vma, addr, pmd);
spin_unlock(ptl);
up_write(&vma->vm_mm->mmap_sem);
atomic_long_dec(&vma->vm_mm->nr_ptes);
pte_free(vma->vm_mm, pmd_pgtable(_pmd));
if (down_write_trylock(&mm->mmap_sem)) {
if (!khugepaged_test_exit(mm)) {
spinlock_t *ptl = pmd_lock(mm, pmd);
/* assume page table is clear */
_pmd = pmdp_collapse_flush(vma, addr, pmd);
spin_unlock(ptl);
atomic_long_dec(&mm->nr_ptes);
pte_free(mm, pmd_pgtable(_pmd));
}
up_write(&mm->mmap_sem);
}
}
i_mmap_unlock_write(mapping);