In the Linux kernel, the following vulnerability has been resolved:

mm/memory-failure: fix hugetlb_lock AA deadlock in get_huge_page_for_hwpoison

Two concurrent madvise(MADV_HWPOISON) calls on the same hugetlb page can
trigger a recursive spinlock self-deadlock (AA deadlock) on hugetlb_lock
when racing with a concurrent unmap:

  thread#0                              thread#1
  --------                              --------
  madvise(folio, MADV_HWPOISON)
    -> poisons the folio successfully
  madvise(folio, MADV_HWPOISON)         unmap(folio)
    try_memory_failure_hugetlb
      get_huge_page_for_hwpoison
        spin_lock_irq(&hugetlb_lock)    <- held
        __get_huge_page_for_hwpoison
          hugetlb_update_hwpoison()
            -> MF_HUGETLB_FOLIO_PRE_POISONED
          goto out:
            folio_put()
              refcount: 1 -> 0
              free_huge_folio()
                spin_lock_irqsave(&hugetlb_lock)
                  -> AA DEADLOCK!

The out: path in __get_huge_page_for_hwpoison() calls folio_put() to drop
the GUP reference while the hugetlb_lock is still held by the hugetlb.c
wrapper get_huge_page_for_hwpoison().  If concurrent unmap has released
the page table mapping reference, folio_put() drops the folio refcount to
zero, triggering free_huge_folio() which attempts to re-acquire the
non-recursive hugetlb_lock.

Fix this by moving hugetlb_lock acquisition from the hugetlb.c wrapper
into get_huge_page_for_hwpoison().  Place spin_unlock_irq() before the
folio_put() at the out: label so the folio is always released outside the
lock.

[[email protected]: fix race, rename label per Miaohe]

https://git.kernel.org/stable/c/3c2d42b8ee345b17a4ba56b0f6492d1ff4c1178e

https://git.kernel.org/stable/c/77b73b54801ae7137479c141fd0473a491c1dc48

https://git.kernel.org/stable/c/a33bfed648c10f5a1519981dbfad80841191edc8

https://git.kernel.org/stable/c/bf7ba8f96c258c30393814491930ae4ecdc5fe5e

https://git.kernel.org/stable/c/dd77a83915b07e2b0205adb284f08b39ae31dc4b

https://git.kernel.org/stable/c/fc3ff42cb0cbf947e4600ae9761c3783760050e2

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