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SubjectRe: [PATCH v3] vfs: new O_NODE open flag
> In other words, revoking file handles is not enough, we really need to
> revoke the _inode_. And if we do that then O_NODE handles are
> perfectly harmless.

If you have revoke() you are half way there, you also the need to make
sure any user cases are updated and well established before you change
anything under them. It's not good adding a kernel feature which makes an
old udev version insecure.

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