提交 ebdf8321 编写于 作者: A Alistair Popple 提交者: Linus Torvalds

mm/migrate: fixup setting UFFD_WP flag

Commit f45ec5ff ("userfaultfd: wp: support swap and page migration")
introduced support for tracking the uffd wp bit during page migration.
However the non-swap PTE variant was used to set the flag for zone device
private pages which are a type of swap page.

This leads to corruption of the swap offset if the original PTE has the
uffd_wp flag set.

Fixes: f45ec5ff ("userfaultfd: wp: support swap and page migration")
Signed-off-by: NAlistair Popple <alistair@popple.id.au>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NPeter Xu <peterx@redhat.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Link: https://lkml.kernel.org/r/20200825064232.10023-1-alistair@popple.id.auSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 7867fd7c
......@@ -251,7 +251,7 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
entry = make_device_private_entry(new, pte_write(pte));
pte = swp_entry_to_pte(entry);
if (pte_swp_uffd_wp(*pvmw.pte))
pte = pte_mkuffd_wp(pte);
pte = pte_swp_mkuffd_wp(pte);
}
}
......
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