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Fix zawy attack

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This commit is contained in:
jl777
2019-07-31 19:02:44 -11:00
parent 074df8e0f3
commit 199d8db019
3 changed files with 5 additions and 7 deletions
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2
src/komodo_bitcoind.h
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@@ -1425,7 +1425,7 @@ arith_uint256 komodo_adaptivepow_target(int32_t height,arith_uint256 bnTarget,ui
tipdiff = (nTime - tipindex->nTime);
if ( tipdiff > 13*ASSETCHAINS_BLOCKTIME )
diff = tipdiff;
if ( diff >= 13 * ASSETCHAINS_BLOCKTIME )
if ( diff >= 13 * ASSETCHAINS_BLOCKTIME && (height < 3000 || tipdiff > 2*ASSETCHAINS_BLOCKTIME) )
{
mult = diff - 12 * ASSETCHAINS_BLOCKTIME;
mult = (mult / ASSETCHAINS_BLOCKTIME) * ASSETCHAINS_BLOCKTIME + ASSETCHAINS_BLOCKTIME / 2;

2
src/main.cpp
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@@ -5288,7 +5288,7 @@ bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& sta
}
// Check timestamp against prev
if (block.GetBlockTime() <= pindexPrev->GetMedianTimePast())
if (block.GetBlockTime() <= pindexPrev->GetMedianTimePast() + 2*ASSETCHAINS_ADAPTIVEPOW*ASSETCHAINS_BLOCKTIME )
{
return state.Invalid(error("%s: block's timestamp is too early", __func__),
REJECT_INVALID, "time-too-old");

8
src/miner.cpp
View File

@@ -123,7 +123,7 @@ public:
void UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev)
{
pblock->nTime = std::max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
pblock->nTime = std::max(pindexPrev->GetMedianTimePast()+1 + 2*ASSETCHAINS_ADAPTIVEPOW*ASSETCHAINS_BLOCKTIME, GetAdjustedTime());
// Updating time can change work required on testnet:
if (consensusParams.nPowAllowMinDifficultyBlocksAfterHeight != boost::none) {
@@ -567,7 +567,7 @@ CBlockTemplate* CreateNewBlock(CPubKey _pk,const CScript& _scriptPubKeyIn, int32
nLastBlockTx = nBlockTx;
nLastBlockSize = nBlockSize;
blocktime = 1 + std::max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
blocktime = 1 + std::max(pindexPrev->GetMedianTimePast()+1+ 2*ASSETCHAINS_ADAPTIVEPOW*ASSETCHAINS_BLOCKTIME, GetAdjustedTime());
//pblock->nTime = blocktime + 1;
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, Params().GetConsensus());
@@ -596,8 +596,6 @@ CBlockTemplate* CreateNewBlock(CPubKey _pk,const CScript& _scriptPubKeyIn, int32
else
{
blocktime = GetAdjustedTime();
//if ( blocktime > pindexPrev->GetMedianTimePast()+60 )
// blocktime = pindexPrev->GetMedianTimePast() + 60;
siglen = komodo_staked(txStaked, pblock->nBits, &blocktime, &txtime, &utxotxid, &utxovout, &utxovalue, utxosig);
// if you skip this check it will create a block too far into the future and not pass ProcessBlock or AcceptBlock.
// This has been moved from the mining loop to save CPU, and to also make ac_staked work with the verus miner.
@@ -642,7 +640,7 @@ CBlockTemplate* CreateNewBlock(CPubKey _pk,const CScript& _scriptPubKeyIn, int32
txNew.vout[0].nValue = GetBlockSubsidy(nHeight,consensusParams) + nFees;
//fprintf(stderr,"mine ht.%d with %.8f\n",nHeight,(double)txNew.vout[0].nValue/COIN);
txNew.nExpiryHeight = 0;
txNew.nLockTime = std::max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
txNew.nLockTime = std::max(pindexPrev->GetMedianTimePast()+1+ 2*ASSETCHAINS_ADAPTIVEPOW*ASSETCHAINS_BLOCKTIME, GetAdjustedTime());
if ( ASSETCHAINS_SYMBOL[0] == 0 && IS_KOMODO_NOTARY != 0 && My_notaryid >= 0 )
txNew.vout[0].nValue += 5000;