core: check if sender is EOA (#23303)

This adds a check to verify that a sender-account does not have code, which means that the codehash is either `emptyCodeHash` _OR_ not present. The latter occurs IFF the sender did not previously exist, a situation which can only occur with zero cost gasprices.

core/state_transition.go

@@ -25,9 +25,12 @@ import (
 	cmath "github.com/ethereum/go-ethereum/common/math"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/params"
 )
 
+var emptyCodeHash = crypto.Keccak256Hash(nil)
+
 /*
 The State Transitioning Model
 
@@ -220,6 +223,11 @@ func (st *StateTransition) preCheck() error {
 				st.msg.From().Hex(), msgNonce, stNonce)
 		}
 	}
+	// Make sure the sender is an EOA
+	if codeHash := st.state.GetCodeHash(st.msg.From()); codeHash != emptyCodeHash && codeHash != (common.Hash{}) {
+		return fmt.Errorf("%w: address %v, codehash: %s", ErrSenderNoEOA,
+			st.msg.From().Hex(), codeHash)
+	}
 	// Make sure that transaction gasFeeCap is greater than the baseFee (post london)
 	if st.evm.ChainConfig().IsLondon(st.evm.Context.BlockNumber) {
 		// Skip the checks if gas fields are zero and baseFee was explicitly disabled (eth_call)