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What will be sent to the library driver as a filter: BPF instructions or the CPU instructions set, if CompileToFastBPF method is called first and then HNAdapter.UserFilter property value is set?

April 26, 2017bpf CPU driver filter instructions library method sent

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What will be sent to the library driver as a filter: BPF instructions or the CPU instructions set, if CompileToFastBPF method is called first and then HNAdapter.UserFilter property value is set?

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A. Only BPF instructions are sent to the library driver as a filter. That works in such a way so to exclude the execution of malicious code at the OS privileged level.