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wdpost: double-check randomness

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This commit is contained in:
Łukasz Magiera 2021-03-10 09:19:38 +01:00
parent b7fab5f937
commit 57fe04ba6e
1 changed files with 10 additions and 1 deletions
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11
storage/wdpost_run.go
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@ -600,9 +600,18 @@ func (s *WindowPoStScheduler) runPost(ctx context.Context, di dline.Info, ts *ty
return nil, xerrors.Errorf("received no proofs back from generate window post")
}
checkRand, err := s.api.ChainGetRandomnessFromBeacon(ctx, types.EmptyTSK, crypto.DomainSeparationTag_WindowedPoStChallengeSeed, di.Challenge, buf.Bytes())
if err != nil {
return nil, xerrors.Errorf("failed to get chain randomness from beacon for window post (ts=%d; deadline=%d): %w", ts.Height(), di, err)
}
if !bytes.Equal(checkRand, rand) {
log.Warnw("windowpost randomness changed", "old", rand, "new", checkRand, "ts-height", ts.Height(), "challenge-height", di.Challenge, "tsk", ts.Key())
}
// If we generated an incorrect proof, try again.
if correct, err := s.verifier.VerifyWindowPoSt(ctx, proof.WindowPoStVerifyInfo{
Randomness: abi.PoStRandomness(rand),
Randomness: abi.PoStRandomness(checkRand),
Proofs: postOut,
ChallengedSectors: sinfos,
Prover: abi.ActorID(mid),