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mm/userfaultfd: reset ptes when close() for wr-protected ones 

Userfaultfd unregister includes a step to remove wr-protect bits from all
the relevant pgtable entries, but that only covered an explicit
UFFDIO_UNREGISTER ioctl, not a close() on the userfaultfd itself.  Cover
that too.  This fixes a WARN trace.

The only user visible side effect is the user can observe leftover
wr-protect bits even if the user close()ed on an userfaultfd when
releasing the last reference of it.  However hopefully that should be
harmless, and nothing bad should happen even if so.

This change is now more important after the recent page-table-check
patch we merged in mm-unstable (446dd9ad37d0 ("mm/page_table_check:
support userfault wr-protect entries")), as we'll do sanity check on
uffd-wp bits without vma context.  So it's better if we can 100%
guarantee no uffd-wp bit leftovers, to make sure each report will be
valid.

Link: https://lore.kernel.org/all/000000000000ca4df20616a0fe16@google.com/
Fixes: f369b07c86 ("mm/uffd: reset write protection when unregister with wp-mode")
Analyzed-by: David Hildenbrand <david@redhat.com>
Link: https://lkml.kernel.org/r/20240422133311.2987675-1-peterx@redhat.com
Reported-by: syzbot+d8426b591c36b21c750e@syzkaller.appspotmail.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2024-04-22 09:33:11 -04:00 committed by Andrew Morton
parent 52ccdde16b
commit c88033efe9
1 changed files with 4 additions and 0 deletions
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4
fs/userfaultfd.c
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@ -895,6 +895,10 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
prev = vma;
continue;
}
/* Reset ptes for the whole vma range if wr-protected */
if (userfaultfd_wp(vma))
uffd_wp_range(vma, vma->vm_start,
vma->vm_end - vma->vm_start, false);
new_flags = vma->vm_flags & ~__VM_UFFD_FLAGS;
vma = vma_modify_flags_uffd(&vmi, prev, vma, vma->vm_start,
vma->vm_end, new_flags,