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Date:   Tue, 16 Apr 2019 08:55:59 -0500
From:   Kees Cook <>
To:     Daniel Borkmann <>
Cc:     Hannes Frederic Sowa <>,
        LKML <>,
        Ingo Molnar <>,
        "Reshetova, Elena" <>,
        Alexei Starovoitov <>
Subject: Re: BPF RNG

[correcting Alexei's email address and resending...]

On Tue, Apr 16, 2019 at 8:54 AM Kees Cook <> wrote:
> Hi,
> In looking at prandom_u32() users, I noticed that BPF uses its own
> state variable with bpf_user_rnd_u32(). It appears that this state is
> never reseeded like regular prandom_u32(). (See __prandom_timer().) Is
> this intentional, or should reseeding be happening?
> -Kees
> --
> Kees Cook

Kees Cook

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