Messages in this thread |  | | Subject | Re: BPF RNG | From | Daniel Borkmann <> | Date | Tue, 16 Apr 2019 16:44:40 +0200 |
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On 04/16/2019 03:55 PM, Kees Cook wrote: > [correcting Alexei's email address and resending...] > > On Tue, Apr 16, 2019 at 8:54 AM Kees Cook <keescook@google.com> 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
Correct, we split that off from the main one.
>> never reseeded like regular prandom_u32(). (See __prandom_timer().) Is >> this intentional, or should reseeding be happening?
The prng is not to be used in any security-critical context. That said, we optionally could perform reseeding from time to time, though that should probably be done generically, so that all "external" prandom_u32_state() users could register themselves upon init whether they opt-in for periodic reseeding or not.
Thanks, Daniel
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