diff options
Diffstat (limited to 'consensus/ethash/consensus.go')
| -rw-r--r-- | consensus/ethash/consensus.go | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/consensus/ethash/consensus.go b/consensus/ethash/consensus.go index 82d23c92b..92a23d4a4 100644 --- a/consensus/ethash/consensus.go +++ b/consensus/ethash/consensus.go @@ -476,7 +476,7 @@ func (ethash *Ethash) VerifySeal(chain consensus.ChainReader, header *types.Head } // Sanity check that the block number is below the lookup table size (60M blocks) number := header.Number.Uint64() - if number/epochLength >= uint64(len(cacheSizes)) { + if number/epochLength >= maxEpoch { // Go < 1.7 cannot calculate new cache/dataset sizes (no fast prime check) return errNonceOutOfRange } @@ -484,14 +484,18 @@ func (ethash *Ethash) VerifySeal(chain consensus.ChainReader, header *types.Head if header.Difficulty.Sign() <= 0 { return errInvalidDifficulty } + // Recompute the digest and PoW value and verify against the header cache := ethash.cache(number) - size := datasetSize(number) if ethash.config.PowMode == ModeTest { size = 32 * 1024 } - digest, result := hashimotoLight(size, cache, header.HashNoNonce().Bytes(), header.Nonce.Uint64()) + digest, result := hashimotoLight(size, cache.cache, header.HashNoNonce().Bytes(), header.Nonce.Uint64()) + // Caches are unmapped in a finalizer. Ensure that the cache stays live + // until after the call to hashimotoLight so it's not unmapped while being used. + runtime.KeepAlive(cache) + if !bytes.Equal(header.MixDigest[:], digest) { return errInvalidMixDigest } |