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core/evm: avoid copying memory for input in calls (#20177)

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* core/evm, contracts: avoid copying memory for input in calls + make ecrecover not modify input buffer

* core/vm: optimize mstore a bit

* core/vm: change Get -> GetCopy in vm memory access
This commit is contained in:
Martin Holst Swende 2019-11-04 10:31:10 +01:00 committed by Péter Szilágyi
parent 7a6d5d0cce
commit b566cfdffd
6 changed files with 84 additions and 18 deletions
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7
core/vm/contracts.go
View File

@ -106,8 +106,13 @@ func (c *ecrecover) Run(input []byte) ([]byte, error) {
if !allZero(input[32:63]) || !crypto.ValidateSignatureValues(v, r, s, false) {
return nil, nil
}
// We must make sure not to modify the 'input', so placing the 'v' along with
// the signature needs to be done on a new allocation
sig := make([]byte, 65)
copy(sig, input[64:128])
sig[64] = v
// v needs to be at the end for libsecp256k1
pubKey, err := crypto.Ecrecover(input[:32], append(input[64:128], v))
pubKey, err := crypto.Ecrecover(input[:32], sig)
// make sure the public key is a valid one
if err != nil {
return nil, nil

63
core/vm/contracts_test.go
View File

@ -17,6 +17,7 @@
package vm
import (
"bytes"
"fmt"
"math/big"
"reflect"
@ -409,6 +410,11 @@ func testPrecompiled(addr string, test precompiledTest, t *testing.T) {
} else if common.Bytes2Hex(res) != test.expected {
t.Errorf("Expected %v, got %v", test.expected, common.Bytes2Hex(res))
}
// Verify that the precompile did not touch the input buffer
exp := common.Hex2Bytes(test.input)
if !bytes.Equal(in, exp) {
t.Errorf("Precompiled %v modified input data", addr)
}
})
}
@ -423,6 +429,11 @@ func testPrecompiledFailure(addr string, test precompiledFailureTest, t *testing
if !reflect.DeepEqual(err, test.expectedError) {
t.Errorf("Expected error [%v], got [%v]", test.expectedError, err)
}
// Verify that the precompile did not touch the input buffer
exp := common.Hex2Bytes(test.input)
if !bytes.Equal(in, exp) {
t.Errorf("Precompiled %v modified input data", addr)
}
})
}
@ -574,3 +585,55 @@ func TestPrecompileBlake2FMalformedInput(t *testing.T) {
testPrecompiledFailure("09", test, t)
}
}
// EcRecover test vectors
var ecRecoverTests = []precompiledTest{
{
input: "a8b53bdf3306a35a7103ab5504a0c9b492295564b6202b1942a84ef300107281" +
"000000000000000000000000000000000000000000000000000000000000001b" +
"3078356531653033663533636531386237373263636230303933666637316633" +
"6635336635633735623734646362333161383561613862383839326234653862" +
"1122334455667788991011121314151617181920212223242526272829303132",
expected: "",
name: "CallEcrecoverUnrecoverableKey",
},
{
input: "18c547e4f7b0f325ad1e56f57e26c745b09a3e503d86e00e5255ff7f715d3d1c" +
"000000000000000000000000000000000000000000000000000000000000001c" +
"73b1693892219d736caba55bdb67216e485557ea6b6af75f37096c9aa6a5a75f" +
"eeb940b1d03b21e36b0e47e79769f095fe2ab855bd91e3a38756b7d75a9c4549",
expected: "000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b",
name: "ValidKey",
},
{
input: "18c547e4f7b0f325ad1e56f57e26c745b09a3e503d86e00e5255ff7f715d3d1c" +
"100000000000000000000000000000000000000000000000000000000000001c" +
"73b1693892219d736caba55bdb67216e485557ea6b6af75f37096c9aa6a5a75f" +
"eeb940b1d03b21e36b0e47e79769f095fe2ab855bd91e3a38756b7d75a9c4549",
expected: "",
name: "InvalidHighV-bits-1",
},
{
input: "18c547e4f7b0f325ad1e56f57e26c745b09a3e503d86e00e5255ff7f715d3d1c" +
"000000000000000000000000000000000000001000000000000000000000001c" +
"73b1693892219d736caba55bdb67216e485557ea6b6af75f37096c9aa6a5a75f" +
"eeb940b1d03b21e36b0e47e79769f095fe2ab855bd91e3a38756b7d75a9c4549",
expected: "",
name: "InvalidHighV-bits-2",
},
{
input: "18c547e4f7b0f325ad1e56f57e26c745b09a3e503d86e00e5255ff7f715d3d1c" +
"000000000000000000000000000000000000001000000000000000000000011c" +
"73b1693892219d736caba55bdb67216e485557ea6b6af75f37096c9aa6a5a75f" +
"eeb940b1d03b21e36b0e47e79769f095fe2ab855bd91e3a38756b7d75a9c4549",
expected: "",
name: "InvalidHighV-bits-3",
},
}
func TestPrecompiledEcrecover(t *testing.T) {
for _, test := range ecRecoverTests {
testPrecompiled("01", test, t)
}
}

24
core/vm/instructions.go
View File

@ -384,7 +384,7 @@ func opSAR(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *
func opSha3(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
offset, size := stack.pop(), stack.pop()
data := memory.Get(offset.Int64(), size.Int64())
data := memory.GetPtr(offset.Int64(), size.Int64())
if interpreter.hasher == nil {
interpreter.hasher = sha3.NewLegacyKeccak256().(keccakState)
@ -602,11 +602,9 @@ func opPop(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *
}
func opMload(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
offset := stack.pop()
val := interpreter.intPool.get().SetBytes(memory.Get(offset.Int64(), 32))
stack.push(val)
interpreter.intPool.put(offset)
v := stack.peek()
offset := v.Int64()
v.SetBytes(memory.GetPtr(offset, 32))
return nil, nil
}
@ -691,7 +689,7 @@ func opCreate(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memor
var (
value = stack.pop()
offset, size = stack.pop(), stack.pop()
input = memory.Get(offset.Int64(), size.Int64())
input = memory.GetCopy(offset.Int64(), size.Int64())
gas = contract.Gas
)
if interpreter.evm.chainRules.IsEIP150 {
@ -725,7 +723,7 @@ func opCreate2(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memo
endowment = stack.pop()
offset, size = stack.pop(), stack.pop()
salt = stack.pop()
input = memory.Get(offset.Int64(), size.Int64())
input = memory.GetCopy(offset.Int64(), size.Int64())
gas = contract.Gas
)
@ -757,7 +755,7 @@ func opCall(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory
toAddr := common.BigToAddress(addr)
value = math.U256(value)
// Get the arguments from the memory.
args := memory.Get(inOffset.Int64(), inSize.Int64())
args := memory.GetPtr(inOffset.Int64(), inSize.Int64())
if value.Sign() != 0 {
gas += params.CallStipend
@ -786,7 +784,7 @@ func opCallCode(pc *uint64, interpreter *EVMInterpreter, contract *Contract, mem
toAddr := common.BigToAddress(addr)
value = math.U256(value)
// Get arguments from the memory.
args := memory.Get(inOffset.Int64(), inSize.Int64())
args := memory.GetPtr(inOffset.Int64(), inSize.Int64())
if value.Sign() != 0 {
gas += params.CallStipend
@ -814,7 +812,7 @@ func opDelegateCall(pc *uint64, interpreter *EVMInterpreter, contract *Contract,
addr, inOffset, inSize, retOffset, retSize := stack.pop(), stack.pop(), stack.pop(), stack.pop(), stack.pop()
toAddr := common.BigToAddress(addr)
// Get arguments from the memory.
args := memory.Get(inOffset.Int64(), inSize.Int64())
args := memory.GetPtr(inOffset.Int64(), inSize.Int64())
ret, returnGas, err := interpreter.evm.DelegateCall(contract, toAddr, args, gas)
if err != nil {
@ -839,7 +837,7 @@ func opStaticCall(pc *uint64, interpreter *EVMInterpreter, contract *Contract, m
addr, inOffset, inSize, retOffset, retSize := stack.pop(), stack.pop(), stack.pop(), stack.pop(), stack.pop()
toAddr := common.BigToAddress(addr)
// Get arguments from the memory.
args := memory.Get(inOffset.Int64(), inSize.Int64())
args := memory.GetPtr(inOffset.Int64(), inSize.Int64())
ret, returnGas, err := interpreter.evm.StaticCall(contract, toAddr, args, gas)
if err != nil {
@ -895,7 +893,7 @@ func makeLog(size int) executionFunc {
topics[i] = common.BigToHash(stack.pop())
}
d := memory.Get(mStart.Int64(), mSize.Int64())
d := memory.GetCopy(mStart.Int64(), mSize.Int64())
interpreter.evm.StateDB.AddLog(&types.Log{
Address: contract.Address(),
Topics: topics,

4
core/vm/instructions_test.go
View File

@ -509,12 +509,12 @@ func TestOpMstore(t *testing.T) {
v := "abcdef00000000000000abba000000000deaf000000c0de00100000000133700"
stack.pushN(new(big.Int).SetBytes(common.Hex2Bytes(v)), big.NewInt(0))
opMstore(&pc, evmInterpreter, nil, mem, stack)
if got := common.Bytes2Hex(mem.Get(0, 32)); got != v {
if got := common.Bytes2Hex(mem.GetCopy(0, 32)); got != v {
t.Fatalf("Mstore fail, got %v, expected %v", got, v)
}
stack.pushN(big.NewInt(0x1), big.NewInt(0))
opMstore(&pc, evmInterpreter, nil, mem, stack)
if common.Bytes2Hex(mem.Get(0, 32)) != "0000000000000000000000000000000000000000000000000000000000000001" {
if common.Bytes2Hex(mem.GetCopy(0, 32)) != "0000000000000000000000000000000000000000000000000000000000000001" {
t.Fatalf("Mstore failed to overwrite previous value")
}
poolOfIntPools.put(evmInterpreter.intPool)

2
core/vm/memory.go
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@ -70,7 +70,7 @@ func (m *Memory) Resize(size uint64) {
}
// Get returns offset + size as a new slice
func (m *Memory) Get(offset, size int64) (cpy []byte) {
func (m *Memory) GetCopy(offset, size int64) (cpy []byte) {
if size == 0 {
return nil
}

2
eth/tracers/tracer.go
View File

@ -99,7 +99,7 @@ func (mw *memoryWrapper) slice(begin, end int64) []byte {
log.Warn("Tracer accessed out of bound memory", "available", mw.memory.Len(), "offset", begin, "size", end-begin)
return nil
}
return mw.memory.Get(begin, end-begin)
return mw.memory.GetCopy(begin, end-begin)
}
// getUint returns the 32 bytes at the specified address interpreted as a uint.