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 <[email protected]> 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
