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Merge PR #2488 from nspcc-dev/reorder-neo-gas-distribution

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This commit is contained in:
Roman Khimov 2022-05-13 19:36:34 +03:00
commit 058a7eff90
5 changed files with 88 additions and 56 deletions
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9
CHANGELOG.md
View file

@ -2,6 +2,15 @@
This document outlines major changes between releases.
## 0.98.5 "Neutralization" (13 May 2022)
An urgent update to fix the same security issue that was fixed in 3.1.0.1 C#
node release. Please upgrade as soon as possible, resynchronization is not
needed for mainnet.
Bugs fixed:
* GAS emission now happens after NEO transfer is finished (#2488)
## 0.98.4 "Mesmerization" (11 May 2022)
An urgent release to fix incompatibility with mainnet at block 1528989. The

10
pkg/core/native/native_gas.go
View file

@ -51,19 +51,19 @@ func newGAS(init int64, p2pSigExtensionsEnabled bool) *GAS {
return g
}
func (g *GAS) increaseBalance(_ *interop.Context, _ util.Uint160, si *state.StorageItem, amount *big.Int, checkBal *big.Int) error {
func (g *GAS) increaseBalance(_ *interop.Context, _ util.Uint160, si *state.StorageItem, amount *big.Int, checkBal *big.Int) (func(), error) {
acc, err := state.NEP17BalanceFromBytes(*si)
if err != nil {
return err
return nil, err
}
if sign := amount.Sign(); sign == 0 {
// Requested self-transfer amount can be higher than actual balance.
if checkBal != nil && acc.Balance.Cmp(checkBal) < 0 {
err = errors.New("insufficient funds")
}
return err
return nil, err
} else if sign == -1 && acc.Balance.CmpAbs(amount) == -1 {
return errors.New("insufficient funds")
return nil, errors.New("insufficient funds")
}
acc.Balance.Add(&acc.Balance, amount)
if acc.Balance.Sign() != 0 {
@ -71,7 +71,7 @@ func (g *GAS) increaseBalance(_ *interop.Context, _ util.Uint160, si *state.Stor
} else {
*si = nil
}
return nil
return nil, nil
}
func (g *GAS) balanceFromBytes(si *state.StorageItem) (*big.Int, error) {

44
pkg/core/native/native_neo.go
View file

@ -464,28 +464,34 @@ func (n *NEO) getGASPerVote(d *dao.Simple, key []byte, indexes []uint32) []big.I
return reward
}
func (n *NEO) increaseBalance(ic *interop.Context, h util.Uint160, si *state.StorageItem, amount *big.Int, checkBal *big.Int) error {
func (n *NEO) increaseBalance(ic *interop.Context, h util.Uint160, si *state.StorageItem, amount *big.Int, checkBal *big.Int) (func(), error) {
var postF func()
acc, err := state.NEOBalanceFromBytes(*si)
if err != nil {
return err
return nil, err
}
if (amount.Sign() == -1 && acc.Balance.CmpAbs(amount) == -1) ||
(amount.Sign() == 0 && checkBal != nil && acc.Balance.Cmp(checkBal) == -1) {
return errors.New("insufficient funds")
return nil, errors.New("insufficient funds")
}
if err := n.distributeGas(ic, h, acc); err != nil {
return err
newGas, err := n.distributeGas(ic, acc)
if err != nil {
return nil, err
}
if newGas != nil { // Can be if it was already distributed in the same block.
postF = func() { n.GAS.mint(ic, h, newGas, true) }
}
if amount.Sign() == 0 {
*si = acc.Bytes()
return nil
return postF, nil
}
if err := n.ModifyAccountVotes(acc, ic.DAO, amount, false); err != nil {
return err
return nil, err
}
if acc.VoteTo != nil {
if err := n.modifyVoterTurnout(ic.DAO, amount); err != nil {
return err
return nil, err
}
}
acc.Balance.Add(&acc.Balance, amount)
@ -494,7 +500,7 @@ func (n *NEO) increaseBalance(ic *interop.Context, h util.Uint160, si *state.Sto
} else {
*si = nil
}
return nil
return postF, nil
}
func (n *NEO) balanceFromBytes(si *state.StorageItem) (*big.Int, error) {
@ -505,23 +511,17 @@ func (n *NEO) balanceFromBytes(si *state.StorageItem) (*big.Int, error) {
return &acc.Balance, err
}
func (n *NEO) distributeGas(ic *interop.Context, h util.Uint160, acc *state.NEOBalance) error {
func (n *NEO) distributeGas(ic *interop.Context, acc *state.NEOBalance) (*big.Int, error) {
if ic.Block == nil || ic.Block.Index == 0 || ic.Block.Index == acc.BalanceHeight {
return nil
return nil, nil
}
gen, err := n.calculateBonus(ic.DAO, acc.VoteTo, &acc.Balance, acc.BalanceHeight, ic.Block.Index)
if err != nil {
return err
return nil, err
}
acc.BalanceHeight = ic.Block.Index
// Must store acc before GAS distribution to fix acc's BalanceHeight value in the storage for
// further acc's queries from `onNEP17Payment` if so, see https://github.com/nspcc-dev/neo-go/pull/2181.
key := makeAccountKey(h)
ic.DAO.PutStorageItem(n.ID, key, acc.Bytes())
n.GAS.mint(ic, h, gen, true)
return nil
return gen, nil
}
func (n *NEO) unclaimedGas(ic *interop.Context, args []stackitem.Item) stackitem.Item {
@ -827,7 +827,8 @@ func (n *NEO) VoteInternal(ic *interop.Context, h util.Uint160, pub *keys.Public
return err
}
}
if err := n.distributeGas(ic, h, acc); err != nil {
newGas, err := n.distributeGas(ic, acc)
if err != nil {
return err
}
if err := n.ModifyAccountVotes(acc, ic.DAO, new(big.Int).Neg(&acc.Balance), false); err != nil {
@ -838,6 +839,9 @@ func (n *NEO) VoteInternal(ic *interop.Context, h util.Uint160, pub *keys.Public
return err
}
ic.DAO.PutStorageItem(n.ID, key, acc.Bytes())
if newGas != nil { // Can be if it was already distributed in the same block.
n.GAS.mint(ic, h, newGas, true)
}
return nil
}

55
pkg/core/native/native_nep17.go
View file

@ -33,7 +33,7 @@ type nep17TokenNative struct {
symbol string
decimals int64
factor int64
incBalance func(*interop.Context, util.Uint160, *state.StorageItem, *big.Int, *big.Int) error
incBalance func(*interop.Context, util.Uint160, *state.StorageItem, *big.Int, *big.Int) (func(), error)
balFromBytes func(item *state.StorageItem) (*big.Int, error)
}
@ -128,7 +128,18 @@ func addrToStackItem(u *util.Uint160) stackitem.Item {
}
func (c *nep17TokenNative) postTransfer(ic *interop.Context, from, to *util.Uint160, amount *big.Int,
data stackitem.Item, callOnPayment bool) {
data stackitem.Item, callOnPayment bool, postCalls ...func()) {
var skipPostCalls bool
defer func() {
if skipPostCalls {
return
}
for _, f := range postCalls {
if f != nil {
f()
}
}
}()
c.emitTransfer(ic, from, to, amount)
if to == nil || !callOnPayment {
return
@ -148,6 +159,7 @@ func (c *nep17TokenNative) postTransfer(ic *interop.Context, from, to *util.Uint
data,
}
if err := contract.CallFromNative(ic, c.Hash, cs, manifest.MethodOnNEP17Payment, args, false); err != nil {
skipPostCalls = true
panic(err)
}
}
@ -167,37 +179,39 @@ func (c *nep17TokenNative) emitTransfer(ic *interop.Context, from, to *util.Uint
// updateAccBalance adds the specified amount to the acc's balance. If requiredBalance
// is set and amount is 0, the acc's balance is checked against requiredBalance.
func (c *nep17TokenNative) updateAccBalance(ic *interop.Context, acc util.Uint160, amount *big.Int, requiredBalance *big.Int) error {
func (c *nep17TokenNative) updateAccBalance(ic *interop.Context, acc util.Uint160, amount *big.Int, requiredBalance *big.Int) (func(), error) {
key := makeAccountKey(acc)
si := ic.DAO.GetStorageItem(c.ID, key)
if si == nil {
if amount.Sign() < 0 {
return errors.New("insufficient funds")
return nil, errors.New("insufficient funds")
}
if amount.Sign() == 0 {
// it's OK to transfer 0 if the balance is 0, no need to put si to the storage
return nil
return nil, nil
}
si = state.StorageItem{}
}
err := c.incBalance(ic, acc, &si, amount, requiredBalance)
postF, err := c.incBalance(ic, acc, &si, amount, requiredBalance)
if err != nil {
if si != nil && amount.Sign() <= 0 {
ic.DAO.PutStorageItem(c.ID, key, si)
}
return err
return nil, err
}
if si == nil {
ic.DAO.DeleteStorageItem(c.ID, key)
} else {
ic.DAO.PutStorageItem(c.ID, key, si)
}
return nil
return postF, nil
}
// TransferInternal transfers NEO across accounts.
func (c *nep17TokenNative) TransferInternal(ic *interop.Context, from, to util.Uint160, amount *big.Int, data stackitem.Item) error {
var postF1, postF2 func()
if amount.Sign() == -1 {
return errors.New("negative amount")
}
@ -218,17 +232,20 @@ func (c *nep17TokenNative) TransferInternal(ic *interop.Context, from, to util.U
} else {
inc = new(big.Int).Neg(inc)
}
if err := c.updateAccBalance(ic, from, inc, amount); err != nil {
postF1, err := c.updateAccBalance(ic, from, inc, amount)
if err != nil {
return err
}
if !isEmpty {
if err := c.updateAccBalance(ic, to, amount, nil); err != nil {
postF2, err = c.updateAccBalance(ic, to, amount, nil)
if err != nil {
return err
}
}
c.postTransfer(ic, &from, &to, amount, data, true)
c.postTransfer(ic, &from, &to, amount, data, true, postF1, postF2)
return nil
}
@ -254,8 +271,8 @@ func (c *nep17TokenNative) mint(ic *interop.Context, h util.Uint160, amount *big
if amount.Sign() == 0 {
return
}
c.addTokens(ic, h, amount)
c.postTransfer(ic, nil, &h, amount, stackitem.Null{}, callOnPayment)
postF := c.addTokens(ic, h, amount)
c.postTransfer(ic, nil, &h, amount, stackitem.Null{}, callOnPayment, postF)
}
func (c *nep17TokenNative) burn(ic *interop.Context, h util.Uint160, amount *big.Int) {
@ -263,14 +280,14 @@ func (c *nep17TokenNative) burn(ic *interop.Context, h util.Uint160, amount *big
return
}
amount.Neg(amount)
c.addTokens(ic, h, amount)
postF := c.addTokens(ic, h, amount)
amount.Neg(amount)
c.postTransfer(ic, &h, nil, amount, stackitem.Null{}, false)
c.postTransfer(ic, &h, nil, amount, stackitem.Null{}, false, postF)
}
func (c *nep17TokenNative) addTokens(ic *interop.Context, h util.Uint160, amount *big.Int) {
func (c *nep17TokenNative) addTokens(ic *interop.Context, h util.Uint160, amount *big.Int) func() {
if amount.Sign() == 0 {
return
return nil
}
key := makeAccountKey(h)
@ -278,7 +295,8 @@ func (c *nep17TokenNative) addTokens(ic *interop.Context, h util.Uint160, amount
if si == nil {
si = state.StorageItem{}
}
if err := c.incBalance(ic, h, &si, amount, nil); err != nil {
postF, err := c.incBalance(ic, h, &si, amount, nil)
if err != nil {
panic(err)
}
if si == nil {
@ -290,6 +308,7 @@ func (c *nep17TokenNative) addTokens(ic *interop.Context, h util.Uint160, amount
buf, supply := c.getTotalSupply(ic.DAO)
supply.Add(supply, amount)
c.saveTotalSupply(ic.DAO, buf, supply)
return postF
}
func newDescriptor(name string, ret smartcontract.ParamType, ps ...manifest.Parameter) *manifest.Method {

26
pkg/core/native/native_test/neo_test.go
View file

@ -309,7 +309,7 @@ func TestNEO_TransferOnPayment(t *testing.T) {
h := neoValidatorsInvoker.Invoke(t, true, "transfer", e.Validator.ScriptHash(), cs.Hash, amount, nil)
aer := e.GetTxExecResult(t, h)
require.Equal(t, 3, len(aer.Events)) // transfer + GAS claim for sender + onPayment
e.CheckTxNotificationEvent(t, h, 2, state.NotificationEvent{
e.CheckTxNotificationEvent(t, h, 1, state.NotificationEvent{
ScriptHash: cs.Hash,
Name: "LastPayment",
Item: stackitem.NewArray([]stackitem.Item{
@ -323,17 +323,7 @@ func TestNEO_TransferOnPayment(t *testing.T) {
h = neoValidatorsInvoker.Invoke(t, true, "transfer", e.Validator.ScriptHash(), cs.Hash, amount, nil)
aer = e.GetTxExecResult(t, h)
require.Equal(t, 5, len(aer.Events)) // Now we must also have GAS claim for contract and corresponding `onPayment`.
e.CheckTxNotificationEvent(t, h, 2, state.NotificationEvent{ // onPayment for GAS claim
ScriptHash: cs.Hash,
Name: "LastPayment",
Item: stackitem.NewArray([]stackitem.Item{
stackitem.NewByteArray(e.NativeHash(t, nativenames.Gas).BytesBE()),
stackitem.Null{},
stackitem.NewBigInteger(big.NewInt(1)),
stackitem.Null{},
}),
})
e.CheckTxNotificationEvent(t, h, 4, state.NotificationEvent{ // onPayment for NEO transfer
e.CheckTxNotificationEvent(t, h, 1, state.NotificationEvent{ // onPayment for NEO transfer
ScriptHash: cs.Hash,
Name: "LastPayment",
Item: stackitem.NewArray([]stackitem.Item{
@ -343,6 +333,16 @@ func TestNEO_TransferOnPayment(t *testing.T) {
stackitem.Null{},
}),
})
e.CheckTxNotificationEvent(t, h, 4, state.NotificationEvent{ // onPayment for GAS claim
ScriptHash: cs.Hash,
Name: "LastPayment",
Item: stackitem.NewArray([]stackitem.Item{
stackitem.NewByteArray(e.NativeHash(t, nativenames.Gas).BytesBE()),
stackitem.Null{},
stackitem.NewBigInteger(big.NewInt(1)),
stackitem.Null{},
}),
})
}
func TestNEO_Roundtrip(t *testing.T) {
@ -424,7 +424,7 @@ func TestNEO_TransferZeroWithNonZeroBalance(t *testing.T) {
aer, err := e.Chain.GetAppExecResults(h, trigger.Application)
require.NoError(t, err)
require.Equal(t, 2, len(aer[0].Events)) // roundtrip + GAS claim
require.Equal(t, stackitem.NewBigInteger(big.NewInt(0)), aer[0].Events[1].Item.Value().([]stackitem.Item)[2]) // amount is 0
require.Equal(t, stackitem.NewBigInteger(big.NewInt(0)), aer[0].Events[0].Item.Value().([]stackitem.Item)[2]) // amount is 0
// check balance wasn't changed and height was updated
updatedBalance, updatedHeight := e.Chain.GetGoverningTokenBalance(acc.ScriptHash())
require.Equal(t, initialBalance, updatedBalance)