From 58490067c97e072678540ba5a5fcb7c34b09e04a Mon Sep 17 00:00:00 2001
From: Wei-Ning Huang <aitjcize@gmail.com>
Date: Wed, 14 Nov 2018 10:57:53 +0800
Subject: core: validate DKG set with correct nodeset in round-2 (#19)

* vendor: sync consensus core
* core: validate DKG set with correct nodeset in round-2
---
 core/vm/evm.go        | 11 +++++++++--
 core/vm/governance.go | 24 +++++++++++++++++-------
 2 files changed, 26 insertions(+), 9 deletions(-)

(limited to 'core/vm')

diff --git a/core/vm/evm.go b/core/vm/evm.go
index a75d0f1d3..865ab0d5b 100644
--- a/core/vm/evm.go
+++ b/core/vm/evm.go
@@ -18,11 +18,11 @@ package vm
 
 import (
 	"math/big"
-	"sync"
 	"sync/atomic"
 	"time"
 
 	"github.com/dexon-foundation/dexon/common"
+	"github.com/dexon-foundation/dexon/core/state"
 	"github.com/dexon-foundation/dexon/crypto"
 	"github.com/dexon-foundation/dexon/params"
 )
@@ -39,6 +39,10 @@ type (
 	// GetHashFunc returns the nth block hash in the blockchain
 	// and is used by the BLOCKHASH EVM op code.
 	GetHashFunc func(uint64) common.Hash
+	// StateAtFunc returns the statedb given a root hash.
+	StateAtNumberFunc func(uint64) (*state.StateDB, error)
+	// GetRoundHeightFunc returns the round height.
+	GetRoundHeightFunc func(uint64) (uint64, bool)
 )
 
 // run runs the given contract and takes care of running precompiles with a fallback to the byte code interpreter.
@@ -81,6 +85,10 @@ type Context struct {
 	Transfer TransferFunc
 	// GetHash returns the hash corresponding to n
 	GetHash GetHashFunc
+	// StateAtNumber returns the statedb given a root hash.
+	StateAtNumber StateAtNumberFunc
+	// GetRoundHeight returns the round height.
+	GetRoundHeight GetRoundHeightFunc
 
 	// Message information
 	Origin   common.Address // Provides information for ORIGIN
@@ -93,7 +101,6 @@ type Context struct {
 	Time        *big.Int       // Provides information for TIME
 	Randomness  []byte         // Provides information for RAND
 	Difficulty  *big.Int       // Provides information for DIFFICULTY
-	RoundHeight sync.Map       // Provides information of round height mapping.
 }
 
 // EVM is the Ethereum Virtual Machine base object and provides
diff --git a/core/vm/governance.go b/core/vm/governance.go
index 49141761f..b38733e1a 100644
--- a/core/vm/governance.go
+++ b/core/vm/governance.go
@@ -1467,11 +1467,22 @@ func (g *GovernanceContract) penalize() {
 	g.contract.UseGas(g.contract.Gas)
 }
 
-func (g *GovernanceContract) inDKGSet(nodeID coreTypes.NodeID) bool {
+func (g *GovernanceContract) inDKGSet(round *big.Int, nodeID coreTypes.NodeID) bool {
 	target := coreTypes.NewDKGSetTarget(coreCommon.Hash(g.state.CurrentCRS()))
 	ns := coreTypes.NewNodeSet()
 
-	for _, x := range g.state.Nodes() {
+	configRound := big.NewInt(0) // If round < core.ConfigRoundShift, use 0.
+	if round.Uint64() >= core.ConfigRoundShift {
+		configRound = new(big.Int).Sub(round, big.NewInt(int64(core.ConfigRoundShift)))
+	}
+
+	statedb, err := g.evm.Context.StateAtNumber(g.state.RoundHeight(configRound).Uint64())
+	if err != nil {
+		panic(err)
+	}
+
+	state := GovernanceStateHelper{statedb}
+	for _, x := range state.Nodes() {
 		mpk, err := ecdsa.NewPublicKeyFromByteSlice(x.PublicKey)
 		if err != nil {
 			panic(err)
@@ -1515,7 +1526,7 @@ func (g *GovernanceContract) addDKGComplaint(round *big.Int, comp []byte) ([]byt
 	}
 
 	// DKGComplaint must belongs to someone in DKG set.
-	if !g.inDKGSet(dkgComplaint.ProposerID) {
+	if !g.inDKGSet(round, dkgComplaint.ProposerID) {
 		g.penalize()
 		return nil, errExecutionReverted
 	}
@@ -1555,7 +1566,7 @@ func (g *GovernanceContract) addDKGMasterPublicKey(round *big.Int, mpk []byte) (
 	}
 
 	// DKGMasterPublicKey must belongs to someone in DKG set.
-	if !g.inDKGSet(dkgMasterPK.ProposerID) {
+	if !g.inDKGSet(round, dkgMasterPK.ProposerID) {
 		g.penalize()
 		return nil, errExecutionReverted
 	}
@@ -1588,7 +1599,7 @@ func (g *GovernanceContract) addDKGFinalize(round *big.Int, finalize []byte) ([]
 	}
 
 	// DKGFInalize must belongs to someone in DKG set.
-	if !g.inDKGSet(dkgFinalize.ProposerID) {
+	if !g.inDKGSet(round, dkgFinalize.ProposerID) {
 		g.penalize()
 		return nil, errExecutionReverted
 	}
@@ -1757,13 +1768,12 @@ func (g *GovernanceContract) transferOwnership(newOwner common.Address) ([]byte,
 
 func (g *GovernanceContract) snapshotRound(round, height *big.Int) ([]byte, error) {
 	// Validate if this mapping is correct.
-	rawHeight, ok := g.evm.Context.RoundHeight.Load(round)
+	realHeight, ok := g.evm.Context.GetRoundHeight(round.Uint64())
 	if !ok {
 		g.penalize()
 		return nil, errExecutionReverted
 	}
 
-	realHeight := rawHeight.(uint64)
 	if height.Cmp(new(big.Int).SetUint64(realHeight)) != 0 {
 		g.penalize()
 		return nil, errExecutionReverted
-- 
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