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core/vm: use golang native big.Int (#26834)

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reverts #26021, to use the upstream bigint instead.
This commit is contained in:
Martin Holst Swende 2023-03-08 13:12:53 -05:00 committed by GitHub
parent e14043db71
commit b80f05bde2
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 4 additions and 193 deletions
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53
common/math/modexp_test.go
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File diff suppressed because one or more lines are too long

7
core/vm/contracts.go
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@ -29,7 +29,6 @@ import (
"github.com/ethereum/go-ethereum/crypto/bls12381"
"github.com/ethereum/go-ethereum/crypto/bn256"
"github.com/ethereum/go-ethereum/params"
big2 "github.com/holiman/big"
"golang.org/x/crypto/ripemd160"
)
@ -378,9 +377,9 @@ func (c *bigModExp) Run(input []byte) ([]byte, error) {
}
// Retrieve the operands and execute the exponentiation
var (
base = new(big2.Int).SetBytes(getData(input, 0, baseLen))
exp = new(big2.Int).SetBytes(getData(input, baseLen, expLen))
mod = new(big2.Int).SetBytes(getData(input, baseLen+expLen, modLen))
base = new(big.Int).SetBytes(getData(input, 0, baseLen))
exp = new(big.Int).SetBytes(getData(input, baseLen, expLen))
mod = new(big.Int).SetBytes(getData(input, baseLen+expLen, modLen))
v []byte
)
switch {

3
go.mod
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@ -35,7 +35,6 @@ require (
github.com/gorilla/websocket v1.4.2
github.com/graph-gophers/graphql-go v1.3.0
github.com/hashicorp/go-bexpr v0.1.10
github.com/holiman/big v0.0.0-20221017200358-a027dc42d04e
github.com/holiman/bloomfilter/v2 v2.0.3
github.com/holiman/uint256 v1.2.0
github.com/huin/goupnp v1.0.3
@ -45,6 +44,7 @@ require (
github.com/jedisct1/go-minisign v0.0.0-20190909160543-45766022959e
github.com/julienschmidt/httprouter v1.3.0
github.com/karalabe/usb v0.0.2
github.com/kylelemons/godebug v1.1.0
github.com/mattn/go-colorable v0.1.13
github.com/mattn/go-isatty v0.0.16
github.com/naoina/toml v0.1.2-0.20170918210437-9fafd6967416
@ -98,7 +98,6 @@ require (
github.com/klauspost/compress v1.15.15 // indirect
github.com/kr/pretty v0.3.1 // indirect
github.com/kr/text v0.2.0 // indirect
github.com/kylelemons/godebug v1.1.0 // indirect
github.com/mattn/go-runewidth v0.0.9 // indirect
github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
github.com/mitchellh/mapstructure v1.4.1 // indirect

2
go.sum
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@ -293,8 +293,6 @@ github.com/hashicorp/go-version v1.2.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
github.com/holiman/big v0.0.0-20221017200358-a027dc42d04e h1:pIYdhNkDh+YENVNi3gto8n9hAmRxKxoar0iE6BLucjw=
github.com/holiman/big v0.0.0-20221017200358-a027dc42d04e/go.mod h1:j9cQbcqHQujT0oKJ38PylVfqohClLr3CvDC+Qcg+lhU=
github.com/holiman/bloomfilter/v2 v2.0.3 h1:73e0e/V0tCydx14a0SCYS/EWCxgwLZ18CZcZKVu0fao=
github.com/holiman/bloomfilter/v2 v2.0.3/go.mod h1:zpoh+gs7qcpqrHr3dB55AMiJwo0iURXE7ZOP9L9hSkA=
github.com/holiman/uint256 v1.2.0 h1:gpSYcPLWGv4sG43I2mVLiDZCNDh/EpGjSk8tmtxitHM=

2
oss-fuzz.sh
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@ -125,7 +125,5 @@ compile_fuzzer tests/fuzzers/snap FuzzSRange fuzz_storage_range
compile_fuzzer tests/fuzzers/snap FuzzByteCodes fuzz_byte_codes
compile_fuzzer tests/fuzzers/snap FuzzTrieNodes fuzz_trie_nodes
compile_fuzzer tests/fuzzers/modexp Fuzz fuzzModexp
#TODO: move this to tests/fuzzers, if possible
compile_fuzzer crypto/blake2b Fuzz fuzzBlake2b

40
tests/fuzzers/modexp/debug/main.go
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@ -1,40 +0,0 @@
// Copyright 2020 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"fmt"
"os"
"github.com/ethereum/go-ethereum/tests/fuzzers/modexp"
)
func main() {
if len(os.Args) != 2 {
fmt.Fprintf(os.Stderr, "Usage: debug <file>\n")
fmt.Fprintf(os.Stderr, "Example\n")
fmt.Fprintf(os.Stderr, " $ debug ../crashers/4bbef6857c733a87ecf6fd8b9e7238f65eb9862a\n")
os.Exit(1)
}
crasher := os.Args[1]
data, err := os.ReadFile(crasher)
if err != nil {
fmt.Fprintf(os.Stderr, "error loading crasher %v: %v", crasher, err)
os.Exit(1)
}
modexp.Fuzz(data)
}

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