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Set hard limit on maximum randomness lookback for seal proof submissions

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This commit is contained in:
whyrusleeping 2020-01-08 13:40:51 -08:00
parent 959b725ab6
commit 7ba34535b7
2 changed files with 11 additions and 0 deletions
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3
build/params_shared.go
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@ -56,6 +56,9 @@ const SealRandomnessLookback = Finality
// Epochs
const SealRandomnessLookbackLimit = SealRandomnessLookback + 2000
// Maximum lookback that randomness can be sourced from for a seal proof submission
const MaxSealLookback = SealRandomnessLookbackLimit + 2000
// /////
// Mining

8
chain/actors/actor_miner.go
View File

@ -321,6 +321,14 @@ func (sma StorageMinerActor) ProveCommitSector(act *types.Actor, vmctx types.VMC
// TODO: ensure normalization to ID address
maddr := vmctx.Message().To
if vmctx.BlockHeight()-us.Info.SealEpoch > build.MaxSealLookback {
return nil, aerrors.Newf(5, "source randomness for sector SealEpoch too far in past (epoch %d)", us.Info.SealEpoch)
}
if vmctx.BlockHeight()-us.ReceivedEpoch > build.MaxSealLookback {
return nil, aerrors.Newf(6, "source randomness for sector ReceivedEpoch too far in past (epoch %d)", us.ReceivedEpoch)
}
ticket, err := vmctx.GetRandomness(us.Info.SealEpoch - build.SealRandomnessLookback)
if err != nil {
return nil, aerrors.Wrap(err, "failed to get ticket randomness")