Doing impersonation correctly helps massively ;-) But other techniques to mitigate are post-open checking of the resource location (if it's not what you expected there's probably a symlink involved) or checking the link count on the file (for hardlinks).
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I get it, To the best of knowledge, there aren't any object manager callbacks in the kernel(or any other type) that can help you prevent these vulnerabilities from taking place. The only solution, as I see it, is to configure your ACLs properly and impersonate when needed.
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