| commit | 73046fd00b069ffd198eda099dae966e152fae39 | [log] [tgz] |
|---|---|---|
| author | Suren Baghdasaryan <surenb@google.com> | Mon Feb 27 09:36:17 2023 -0800 |
| committer | Andrew Morton <akpm@linux-foundation.org> | Wed Apr 05 20:02:59 2023 -0700 |
| tree | 91ca3bca6083ae6ba8762095e11c66072b345886 | |
| parent | d6ac235de4ba6dc659eebb5f4e5ba0a8523d8424 [diff] |
mm: write-lock VMAs before removing them from VMA tree Write-locking VMAs before isolating them ensures that page fault handlers don't operate on isolated VMAs. [surenb@google.com: mm/nommu: remove unnecessary VMA locking] Link: https://lkml.kernel.org/r/20230301190457.1498985-1-surenb@google.com Link: https://lore.kernel.org/all/Y%2F8CJQGNuMUTdLwP@localhost/ Link: https://lkml.kernel.org/r/20230227173632.3292573-19-surenb@google.com Signed-off-by: Suren Baghdasaryan <surenb@google.com> Cc: David Hildenbrand <david@redhat.com> Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/mm/mmap.c b/mm/mmap.c index 8ba51e7..83adf86 100644 --- a/mm/mmap.c +++ b/mm/mmap.c
@@ -2270,6 +2270,7 @@ int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma, static inline int munmap_sidetree(struct vm_area_struct *vma, struct ma_state *mas_detach) { + vma_start_write(vma); mas_set_range(mas_detach, vma->vm_start, vma->vm_end - 1); if (mas_store_gfp(mas_detach, vma, GFP_KERNEL)) return -ENOMEM;