]> www.infradead.org Git - users/jedix/linux-maple.git/commit
mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte
authorMiaohe Lin <linmiaohe@huawei.com>
Tue, 12 Jul 2022 13:05:42 +0000 (21:05 +0800)
committerakpm <akpm@linux-foundation.org>
Wed, 20 Jul 2022 21:41:01 +0000 (14:41 -0700)
commitcc983da76a90ae484de551309dae96b1992777b6
treee6f34d827ef2b383efd031c802bbfc300c480ab3
parentc80af0c250c8f8a3c978aa5aafbe9c39b336b813
mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/hugetlb.c