diff options
| author | Peter Xu <peterx@redhat.com> | 2021-06-15 18:23:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-16 09:24:42 -0700 |
| commit | 099dd6878b9b12d6bbfa6bf29ce0c8ddd38f6901 (patch) | |
| tree | b6088a641393719d3fd835cd9a0c346ba7c54b30 /mm/swapfile.c | |
| parent | 25182f05ffed0b45602438693e4eed5d7f3ebadd (diff) | |
mm/swap: fix pte_same_as_swp() not removing uffd-wp bit when compare
I found it by pure code review, that pte_same_as_swp() of unuse_vma()
didn't take uffd-wp bit into account when comparing ptes.
pte_same_as_swp() returning false negative could cause failure to
swapoff swap ptes that was wr-protected by userfaultfd.
Link: https://lkml.kernel.org/r/20210603180546.9083-1-peterx@redhat.com
Fixes: f45ec5ff16a7 ("userfaultfd: wp: support swap and page migration")
Signed-off-by: Peter Xu <peterx@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org> [5.7+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 149e77454e3c..996afa8131c8 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1900,7 +1900,7 @@ unsigned int count_swap_pages(int type, int free) static inline int pte_same_as_swp(pte_t pte, pte_t swp_pte) { - return pte_same(pte_swp_clear_soft_dirty(pte), swp_pte); + return pte_same(pte_swp_clear_flags(pte), swp_pte); } /* |