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core/vm: undo change in actual run code

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This commit is contained in:
MariusVanDerWijden 2025-09-02 14:20:58 +02:00
parent d456785bd4
commit a53194ec37
1 changed files with 12 additions and 15 deletions
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27
core/vm/contracts.go
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@ -598,27 +598,24 @@ func (c *bigModExp) RequiredGas(input []byte) uint64 {
} }
func (c *bigModExp) Run(input []byte) ([]byte, error) { func (c *bigModExp) Run(input []byte) ([]byte, error) {
// Extract lengths - they're 32-byte big-endian integers var (
// with the actual uint64 value in the last 8 bytes baseLenBig = new(big.Int).SetBytes(getData(input, 0, 32))
var baseLen, expLen, modLen uint64 expLenBig = new(big.Int).SetBytes(getData(input, 32, 32))
if len(input) >= 32 { modLenBig = new(big.Int).SetBytes(getData(input, 64, 32))
baseLen = binary.BigEndian.Uint64(input[24:32]) baseLen = baseLenBig.Uint64()
} expLen = expLenBig.Uint64()
if len(input) >= 64 { modLen = modLenBig.Uint64()
expLen = binary.BigEndian.Uint64(input[56:64]) inputLenOverflow = max(baseLenBig.BitLen(), expLenBig.BitLen(), modLenBig.BitLen()) > 64
} )
if len(input) >= 96 {
modLen = binary.BigEndian.Uint64(input[88:96])
}
if len(input) > 96 { if len(input) > 96 {
input = input[96:] input = input[96:]
} else { } else {
input = input[:0] input = input[:0]
} }
// enforce size cap for inputs // enforce size cap for inputs
if c.eip7823 && max(baseLen, expLen, modLen) > 1024 { if c.eip7823 && (inputLenOverflow || max(baseLen, expLen, modLen) > 1024) {
return nil, fmt.Errorf("one or more of base/exponent/modulus length exceeded 1024 bytes") return nil, errors.New("one or more of base/exponent/modulus length exceeded 1024 bytes")
} }
// Handle a special case when both the base and mod length is zero // Handle a special case when both the base and mod length is zero
if baseLen == 0 && modLen == 0 { if baseLen == 0 && modLen == 0 {