Messages in this thread | | | Date | Thu, 18 Jan 2024 13:59:41 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] userfaultfd: fix mmap_changing checking in mfill_atomic_hugetlb |
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On Wed, 17 Jan 2024 14:37:29 -0800 Lokesh Gidra <lokeshgidra@google.com> wrote:
> In mfill_atomic_hugetlb(), mmap_changing isn't being checked > again if we drop mmap_lock and reacquire it. When the lock is not held, > mmap_changing could have been incremented. This is also inconsistent > with the behavior in mfill_atomic().
Thanks. Could you and reviewers please consider
- what might be the userspace-visible runtime effects?
- Should the fix be backported into earlier kernels?
- A suitable Fixes: target?
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