core/vm: implement EIP 7823 - Set upper bounds for MODEXP (ethereum#31818)

Author: jwasinger

core/vm/contracts.go

@@ -66,7 +66,7 @@ var PrecompiledContractsByzantium = PrecompiledContracts{
 	common.BytesToAddress([]byte{0x2}): &sha256hash{},
 	common.BytesToAddress([]byte{0x3}): &ripemd160hash{},
 	common.BytesToAddress([]byte{0x4}): &dataCopy{},
-	common.BytesToAddress([]byte{0x5}): &bigModExp{eip2565: false},
+	common.BytesToAddress([]byte{0x5}): &bigModExp{eip2565: false, eip7823: false},
 	common.BytesToAddress([]byte{0x6}): &bn256AddByzantium{},
 	common.BytesToAddress([]byte{0x7}): &bn256ScalarMulByzantium{},
 	common.BytesToAddress([]byte{0x8}): &bn256PairingByzantium{},
@@ -79,7 +79,7 @@ var PrecompiledContractsIstanbul = PrecompiledContracts{
 	common.BytesToAddress([]byte{0x2}): &sha256hash{},
 	common.BytesToAddress([]byte{0x3}): &ripemd160hash{},
 	common.BytesToAddress([]byte{0x4}): &dataCopy{},
-	common.BytesToAddress([]byte{0x5}): &bigModExp{eip2565: false},
+	common.BytesToAddress([]byte{0x5}): &bigModExp{eip2565: false, eip7823: false},
 	common.BytesToAddress([]byte{0x6}): &bn256AddIstanbul{},
 	common.BytesToAddress([]byte{0x7}): &bn256ScalarMulIstanbul{},
 	common.BytesToAddress([]byte{0x8}): &bn256PairingIstanbul{},
@@ -93,7 +93,7 @@ var PrecompiledContractsBerlin = PrecompiledContracts{
 	common.BytesToAddress([]byte{0x2}): &sha256hash{},
 	common.BytesToAddress([]byte{0x3}): &ripemd160hash{},
 	common.BytesToAddress([]byte{0x4}): &dataCopy{},
-	common.BytesToAddress([]byte{0x5}): &bigModExp{eip2565: true},
+	common.BytesToAddress([]byte{0x5}): &bigModExp{eip2565: true, eip7823: false},
 	common.BytesToAddress([]byte{0x6}): &bn256AddIstanbul{},
 	common.BytesToAddress([]byte{0x7}): &bn256ScalarMulIstanbul{},
 	common.BytesToAddress([]byte{0x8}): &bn256PairingIstanbul{},
@@ -107,7 +107,7 @@ var PrecompiledContractsCancun = PrecompiledContracts{
 	common.BytesToAddress([]byte{0x2}): &sha256hash{},
 	common.BytesToAddress([]byte{0x3}): &ripemd160hash{},
 	common.BytesToAddress([]byte{0x4}): &dataCopy{},
-	common.BytesToAddress([]byte{0x5}): &bigModExp{eip2565: true},
+	common.BytesToAddress([]byte{0x5}): &bigModExp{eip2565: true, eip7823: false},
 	common.BytesToAddress([]byte{0x6}): &bn256AddIstanbul{},
 	common.BytesToAddress([]byte{0x7}): &bn256ScalarMulIstanbul{},
 	common.BytesToAddress([]byte{0x8}): &bn256PairingIstanbul{},
@@ -122,7 +122,7 @@ var PrecompiledContractsPrague = PrecompiledContracts{
 	common.BytesToAddress([]byte{0x02}): &sha256hash{},
 	common.BytesToAddress([]byte{0x03}): &ripemd160hash{},
 	common.BytesToAddress([]byte{0x04}): &dataCopy{},
-	common.BytesToAddress([]byte{0x05}): &bigModExp{eip2565: true},
+	common.BytesToAddress([]byte{0x05}): &bigModExp{eip2565: true, eip7823: false},
 	common.BytesToAddress([]byte{0x06}): &bn256AddIstanbul{},
 	common.BytesToAddress([]byte{0x07}): &bn256ScalarMulIstanbul{},
 	common.BytesToAddress([]byte{0x08}): &bn256PairingIstanbul{},
@@ -141,6 +141,28 @@ var PrecompiledContractsBLS = PrecompiledContractsPrague
 
 var PrecompiledContractsVerkle = PrecompiledContractsBerlin
 
+// PrecompiledContractsOsaka contains the set of pre-compiled Ethereum
+// contracts used in the Osaka release.
+var PrecompiledContractsOsaka = PrecompiledContracts{
+	common.BytesToAddress([]byte{0x01}): &ecrecover{},
+	common.BytesToAddress([]byte{0x02}): &sha256hash{},
+	common.BytesToAddress([]byte{0x03}): &ripemd160hash{},
+	common.BytesToAddress([]byte{0x04}): &dataCopy{},
+	common.BytesToAddress([]byte{0x05}): &bigModExp{eip2565: true, eip7823: true},
+	common.BytesToAddress([]byte{0x06}): &bn256AddIstanbul{},
+	common.BytesToAddress([]byte{0x07}): &bn256ScalarMulIstanbul{},
+	common.BytesToAddress([]byte{0x08}): &bn256PairingIstanbul{},
+	common.BytesToAddress([]byte{0x09}): &blake2F{},
+	common.BytesToAddress([]byte{0x0a}): &kzgPointEvaluation{},
+	common.BytesToAddress([]byte{0x0b}): &bls12381G1Add{},
+	common.BytesToAddress([]byte{0x0c}): &bls12381G1MultiExp{},
+	common.BytesToAddress([]byte{0x0d}): &bls12381G2Add{},
+	common.BytesToAddress([]byte{0x0e}): &bls12381G2MultiExp{},
+	common.BytesToAddress([]byte{0x0f}): &bls12381Pairing{},
+	common.BytesToAddress([]byte{0x10}): &bls12381MapG1{},
+	common.BytesToAddress([]byte{0x11}): &bls12381MapG2{},
+}
+
 var (
 	PrecompiledAddressesPrague    []common.Address
 	PrecompiledAddressesCancun    []common.Address
@@ -175,6 +197,8 @@ func activePrecompiledContracts(rules params.Rules) PrecompiledContracts {
 	switch {
 	case rules.IsVerkle:
 		return PrecompiledContractsVerkle
+	case rules.IsOsaka:
+		return PrecompiledContractsOsaka
 	case rules.IsPrague:
 		return PrecompiledContractsPrague
 	case rules.IsCancun:
@@ -317,6 +341,7 @@ func (c *dataCopy) Run(in []byte) ([]byte, error) {
 // bigModExp implements a native big integer exponential modular operation.
 type bigModExp struct {
 	eip2565 bool
+	eip7823 bool
 }
 
 var (
@@ -456,6 +481,10 @@ func (c *bigModExp) Run(input []byte) ([]byte, error) {
 	if baseLen == 0 && modLen == 0 {
 		return []byte{}, nil
 	}
+	// enforce size cap for inputs
+	if c.eip7823 && max(baseLen, expLen, modLen) > 1024 {
+		return nil, fmt.Errorf("one or more of base/exponent/modulus length exceeded 1024 bytes")
+	}
 	// Retrieve the operands and execute the exponentiation
 	var (
 		base = new(big.Int).SetBytes(getData(input, 0, baseLen))