Any codepath that zaps page table entries must invoke MMU notifiers to
ensure that secondary MMUs (like KVM) don't keep accessing pages which
aren't mapped anymore. Secondary MMUs don't hold their own references to
pages that are mirrored over, so failing to notify them can lead to page
use-after-free.
I'm marking this as addressing an issue introduced in commit f3f0e1d2150b
("khugepaged: add support of collapse for tmpfs/shmem pages"), but most of
the security impact of this only came in commit 27e1f8273113 ("khugepaged:
enable collapse pmd for pte-mapped THP"), which actually omitted flushes
for the removal of present PTEs, not just for the removal of empty page
tables.
Link: https://lkml.kernel.org/r/20221129154730.2274278-3-jannh@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20221128180252.1684965-3-jannh@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20221125213714.4115729-3-jannh@xxxxxxxxxx
Fixes: f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages")
Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Yang Shi <shy828301@xxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
[manual backport: this code was refactored from two copies into a common
helper between 5.15 and 6.0;
pmd collapse for PTE-mapped THP was only added in 5.4;
MMU notifier API changed between 4.19 and 5.4]
Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
---
mm/khugepaged.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 6f8a1b423538..644f0a9c8a55 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1304,13 +1304,20 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
*/
if (down_write_trylock(&mm->mmap_sem)) {
if (!khugepaged_test_exit(mm)) {
- spinlock_t *ptl = pmd_lock(mm, pmd);
+ spinlock_t *ptl;
+ unsigned long end = addr + HPAGE_PMD_SIZE;
+
+ mmu_notifier_invalidate_range_start(mm, addr,
+ end);
+ 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);
tlb_remove_table_sync_one();
pte_free(mm, pmd_pgtable(_pmd));
+ mmu_notifier_invalidate_range_end(mm, addr,
+ end);
}
up_write(&mm->mmap_sem);
}
--
2.39.0.314.g84b9a713c41-goog
