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vm: limit POW, fix #2060

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Calculating pow(pow(2, 255), 0xffffffff) takes unknown amount of time. See
also neo-project/neo-vm#422.
This commit is contained in:
Roman Khimov 2021-07-14 10:00:25 +03:00
parent 2b7abd20e7
commit 15be763bb3
2 changed files with 2 additions and 3 deletions
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2
pkg/vm/vm.go
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@ -918,7 +918,7 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
case opcode.POW:
exp := v.estack.Pop().BigInt()
a := v.estack.Pop().BigInt()
if ei := exp.Int64(); !exp.IsInt64() || ei > math.MaxInt32 || ei < 0 {
if ei := exp.Int64(); !exp.IsInt64() || ei > maxSHLArg || ei < 0 {
panic("invalid exponent")
}
v.estack.PushVal(new(big.Int).Exp(a, exp, nil))