mirror of https://github.com/ethereum/go-ethereum
core/vm: use golang native big.Int (#26834)
reverts #26021, to use the upstream bigint instead.pull/26835/head
Martin Holst Swende
2 years ago
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GitHub
parent
e14043db71
commit
b80f05bde2
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// Copyright 2020 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package main |
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import ( |
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"fmt" |
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"os" |
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"github.com/ethereum/go-ethereum/tests/fuzzers/modexp" |
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) |
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func main() { |
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if len(os.Args) != 2 { |
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fmt.Fprintf(os.Stderr, "Usage: debug <file>\n") |
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fmt.Fprintf(os.Stderr, "Example\n") |
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fmt.Fprintf(os.Stderr, " $ debug ../crashers/4bbef6857c733a87ecf6fd8b9e7238f65eb9862a\n") |
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os.Exit(1) |
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} |
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crasher := os.Args[1] |
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data, err := os.ReadFile(crasher) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, "error loading crasher %v: %v", crasher, err) |
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os.Exit(1) |
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} |
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modexp.Fuzz(data) |
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} |
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@ -1,90 +0,0 @@ |
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// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package modexp |
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import ( |
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"fmt" |
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"math/big" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/core/vm" |
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big2 "github.com/holiman/big" |
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) |
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// Fuzz is the fuzzing entry-point.
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// The function must return
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//
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// - 1 if the fuzzer should increase priority of the
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// given input during subsequent fuzzing (for example, the input is lexically
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// correct and was parsed successfully);
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// - -1 if the input must not be added to corpus even if gives new coverage; and
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// - 0 otherwise
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//
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// other values are reserved for future use.
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func Fuzz(input []byte) int { |
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if len(input) <= 96 { |
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return -1 |
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} |
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// Abort on too expensive inputs
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precomp := vm.PrecompiledContractsBerlin[common.BytesToAddress([]byte{5})] |
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if gas := precomp.RequiredGas(input); gas > 40_000_000 { |
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return 0 |
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} |
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var ( |
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baseLen = new(big.Int).SetBytes(getData(input, 0, 32)).Uint64() |
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expLen = new(big.Int).SetBytes(getData(input, 32, 32)).Uint64() |
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modLen = new(big.Int).SetBytes(getData(input, 64, 32)).Uint64() |
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) |
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// Handle a special case when both the base and mod length is zero
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if baseLen == 0 && modLen == 0 { |
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return -1 |
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} |
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input = input[96:] |
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// Retrieve the operands and execute the exponentiation
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var ( |
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base = new(big.Int).SetBytes(getData(input, 0, baseLen)) |
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exp = new(big.Int).SetBytes(getData(input, baseLen, expLen)) |
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mod = new(big.Int).SetBytes(getData(input, baseLen+expLen, modLen)) |
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base2 = new(big2.Int).SetBytes(getData(input, 0, baseLen)) |
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exp2 = new(big2.Int).SetBytes(getData(input, baseLen, expLen)) |
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mod2 = new(big2.Int).SetBytes(getData(input, baseLen+expLen, modLen)) |
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) |
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if mod.BitLen() == 0 { |
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// Modulo 0 is undefined, return zero
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return -1 |
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} |
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var a = new(big2.Int).Exp(base2, exp2, mod2).String() |
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var b = new(big.Int).Exp(base, exp, mod).String() |
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if a != b { |
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panic(fmt.Sprintf("Inequality %#x ^ %#x mod %#x \n have %s\n want %s", base, exp, mod, a, b)) |
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} |
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return 1 |
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} |
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// getData returns a slice from the data based on the start and size and pads
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// up to size with zero's. This function is overflow safe.
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func getData(data []byte, start uint64, size uint64) []byte { |
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length := uint64(len(data)) |
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if start > length { |
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start = length |
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} |
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end := start + size |
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if end > length { |
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end = length |
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} |
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return common.RightPadBytes(data[start:end], int(size)) |
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} |
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