[PATCH 5.15 09/73] mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte

Greg Kroah-Hartman
2022-09-02T12:44:39Z

From: Miaohe Lin <linmiaohe@huawei.com>

commit ab74ef708dc51df7cf2b8a890b9c6990fac5c0c6 upstream.

In MCOPY_ATOMIC_CONTINUE case with a non-shared VMA, pages in the page
cache are installed in the ptes. But hugepage_add_new_anon_rmap is called
for them mistakenly because they're not vm_shared. This will corrupt the
page->mapping used by page cache code.

Link: https://lkml.kernel.org/r/20220712130542.18836-1-linmiaohe@huawei.com
Fixes: f619147104c8 ("userfaultfd: add UFFDIO_CONTINUE ioctl")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
mm/hugetlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -5371,7 +5371,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_s
if (!huge_pte_none(huge_ptep_get(dst_pte)))
goto out_release_unlock;

- if (vm_shared) {
+ if (page_in_pagecache) {
page_dup_rmap(page, true);
} else {
ClearHPageRestoreReserve(page);