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Only match methodIds on the first 4 bytes of calldata

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Th remaining bytes are parameter data
This commit is contained in:
Mason Fischer 2020-01-22 15:32:32 -05:00
parent e83f2b7c9a
commit 2ed2db0cbe
2 changed files with 9 additions and 5 deletions
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4
core/vm/instructions.go
View file

@ -778,10 +778,10 @@ func opCall(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory
args := memory.GetPtr(inOffset.Int64(), inSize.Int64())
fmt.Printf("args 0%x\n", args)
if bytes.Equal(toAddr.Bytes(), OvmContractAddress) && bytes.Equal(args, OvmSLOADMethodId) {
if bytes.Equal(toAddr.Bytes(), OvmContractAddress) && bytes.Equal(args[0:4], OvmSLOADMethodId) {
fmt.Println("SLOAD")
}
if bytes.Equal(toAddr.Bytes(), OvmContractAddress) && bytes.Equal(args, OvmSSTOREMethodId) {
if bytes.Equal(toAddr.Bytes(), OvmContractAddress) && bytes.Equal(args[0:4], OvmSSTOREMethodId) {
fmt.Println("SSTORE")
}
if value.Sign() != 0 {

10
tests/ovm_test.go
View file

@ -10,6 +10,9 @@ import (
"github.com/ethereum/go-ethereum/core/vm/runtime"
)
var KEY = common.FromHex("0000000000000000000000000000000000000000000000000000000000000000")
var VALUE = common.FromHex("0000000000000000000000000000000000000000000000000000000000000001")
func mstoreBytes(bytes []byte) []byte {
output := make([]byte, len(bytes)*5)
for i, b := range bytes {
@ -46,13 +49,14 @@ func TestOvm(t *testing.T) {
db := state.NewDatabase(rawdb.NewMemoryDatabase())
state, _ := state.New(common.Hash{}, db)
address := common.HexToAddress("0x0a")
code := append(
mstoreBytes(vm.OvmSLOADMethodId),
code := mstoreBytes(KEY)
code = append(code, mstoreBytes(vm.OvmSLOADMethodId)...)
code = append(code,
call(
vm.OvmContractAddress,
0,
0,
4,
36,
0,
0)...)