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vm: add support for dynamic invocations in APPCALL

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Fixes #740.
This commit is contained in:
Roman Khimov 2020-03-10 17:17:36 +03:00
parent 3f1e8f66b6
commit 8318adac56
6 changed files with 90 additions and 19 deletions
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6
pkg/compiler/interop_test.go
View file

@ -63,11 +63,11 @@ func TestAppCall(t *testing.T) {
require.NoError(t, err)
ih := hash.Hash160(inner)
getScript := func(u util.Uint160) []byte {
getScript := func(u util.Uint160) ([]byte, bool) {
if u.Equals(ih) {
return inner
return inner, true
}
return nil
return nil, false
}
t.Run("valid script", func(t *testing.T) {

7
pkg/core/blockchain.go
View file

@ -1929,12 +1929,13 @@ func (bc *Blockchain) GetScriptHashesForVerifying(t *transaction.Transaction) ([
// up for current blockchain.
func (bc *Blockchain) spawnVMWithInterops(interopCtx *interopContext) *vm.VM {
vm := vm.New()
vm.SetScriptGetter(func(hash util.Uint160) []byte {
vm.SetScriptGetter(func(hash util.Uint160) ([]byte, bool) {
cs, err := interopCtx.dao.GetContractState(hash)
if err != nil {
return nil
return nil, false
}
return cs.Script
hasDynamicInvoke := (cs.Properties & smartcontract.HasDynamicInvoke) != 0
return cs.Script, hasDynamicInvoke
})
vm.RegisterInteropGetter(interopCtx.getSystemInterop)
vm.RegisterInteropGetter(interopCtx.getNeoInterop)

3
pkg/vm/context.go
View file

@ -35,6 +35,9 @@ type Context struct {
// Script hash of the prog.
scriptHash util.Uint160
// Whether it's allowed to make dynamic calls from this context.
hasDynamicInvoke bool
}
var errNoInstParam = errors.New("failed to read instruction parameter")

4
pkg/vm/json_test.go
View file

@ -174,7 +174,7 @@ func testFile(t *testing.T, filename string) {
})
}
func getScript(scripts []map[string]vmUTScript) func(util.Uint160) []byte {
func getScript(scripts []map[string]vmUTScript) func(util.Uint160) ([]byte, bool) {
store := make(map[util.Uint160][]byte)
for i := range scripts {
for _, v := range scripts[i] {
@ -182,7 +182,7 @@ func getScript(scripts []map[string]vmUTScript) func(util.Uint160) []byte {
}
}
return func(a util.Uint160) []byte { return store[a] }
return func(a util.Uint160) ([]byte, bool) { return store[a], true }
}
func compareItems(t *testing.T, a, b StackItem) {

38
pkg/vm/vm.go
View file

@ -68,7 +68,7 @@ type VM struct {
getPrice func(*VM, opcode.Opcode, []byte) util.Fixed8
// callback to get scripts.
getScript func(util.Uint160) []byte
getScript func(util.Uint160) ([]byte, bool)
istack *Stack // invocation stack.
estack *Stack // execution stack.
@ -266,9 +266,11 @@ func (v *VM) LoadScript(b []byte) {
// loadScriptWithHash if similar to the LoadScript method, but it also loads
// given script hash directly into the Context to avoid its recalculations. It's
// up to user of this function to make sure the script and hash match each other.
func (v *VM) loadScriptWithHash(b []byte, hash util.Uint160) {
func (v *VM) loadScriptWithHash(b []byte, hash util.Uint160, hasDynamicInvoke bool) {
v.LoadScript(b)
v.istack.Top().Value().(*Context).scriptHash = hash
ctx := v.Context()
ctx.scriptHash = hash
ctx.hasDynamicInvoke = hasDynamicInvoke
}
// Context returns the current executed context. Nil if there is no context,
@ -472,7 +474,7 @@ func (v *VM) SetCheckedHash(h []byte) {
}
// SetScriptGetter sets the script getter for CALL instructions.
func (v *VM) SetScriptGetter(gs func(util.Uint160) []byte) {
func (v *VM) SetScriptGetter(gs func(util.Uint160) ([]byte, bool)) {
v.getScript = gs
}
@ -518,6 +520,27 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
}
}
switch op {
case opcode.APPCALL, opcode.TAILCALL:
isZero := true
for i := range parameter {
if parameter[i] != 0 {
isZero = false
break
}
}
if !isZero {
break
}
parameter = v.estack.Pop().Bytes()
fallthrough
case opcode.CALLED, opcode.CALLEDT:
if !ctx.hasDynamicInvoke {
panic("contract is not allowed to make dynamic invocations")
}
}
if op >= opcode.PUSHBYTES1 && op <= opcode.PUSHBYTES75 {
v.estack.PushVal(parameter)
return
@ -1150,7 +1173,7 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
panic(err)
}
script := v.getScript(hash)
script, hasDynamicInvoke := v.getScript(hash)
if script == nil {
panic("could not find script")
}
@ -1159,7 +1182,7 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
_ = v.istack.Pop()
}
v.loadScriptWithHash(script, hash)
v.loadScriptWithHash(script, hash, hasDynamicInvoke)
case opcode.RET:
oldCtx := v.istack.Pop().Value().(*Context)
@ -1354,12 +1377,13 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
if err != nil {
panic(err)
}
script := v.getScript(hash)
script, hasDynamicInvoke := v.getScript(hash)
if script == nil {
panic(fmt.Sprintf("could not find script %s", hash))
}
newCtx = NewContext(script)
newCtx.scriptHash = hash
newCtx.hasDynamicInvoke = hasDynamicInvoke
}
newCtx.rvcount = rvcount
newCtx.estack = NewStack("evaluation")

51
pkg/vm/vm_test.go
View file

@ -1670,16 +1670,16 @@ func TestSIGNByteArray(t *testing.T) {
func TestAppCall(t *testing.T) {
prog := []byte{byte(opcode.APPCALL)}
hash := util.Uint160{}
hash := util.Uint160{1, 2}
prog = append(prog, hash.BytesBE()...)
prog = append(prog, byte(opcode.RET))
vm := load(prog)
vm.SetScriptGetter(func(in util.Uint160) []byte {
vm.SetScriptGetter(func(in util.Uint160) ([]byte, bool) {
if in.Equals(hash) {
return makeProgram(opcode.DEPTH)
return makeProgram(opcode.DEPTH), true
}
return nil
return nil, false
})
vm.estack.PushVal(2)
@ -1688,6 +1688,49 @@ func TestAppCall(t *testing.T) {
assert.Equal(t, int64(1), elem.BigInt().Int64())
}
func TestAppCallDynamicBad(t *testing.T) {
prog := []byte{byte(opcode.APPCALL)}
hash := util.Uint160{}
prog = append(prog, hash.BytesBE()...)
prog = append(prog, byte(opcode.RET))
vm := load(prog)
vm.SetScriptGetter(func(in util.Uint160) ([]byte, bool) {
if in.Equals(hash) {
return makeProgram(opcode.DEPTH), true
}
return nil, false
})
vm.estack.PushVal(2)
vm.estack.PushVal(hash.BytesBE())
checkVMFailed(t, vm)
}
func TestAppCallDynamicGood(t *testing.T) {
prog := []byte{byte(opcode.APPCALL)}
zeroHash := util.Uint160{}
hash := util.Uint160{1, 2, 3}
prog = append(prog, zeroHash.BytesBE()...)
prog = append(prog, byte(opcode.RET))
vm := load(prog)
vm.SetScriptGetter(func(in util.Uint160) ([]byte, bool) {
if in.Equals(hash) {
return makeProgram(opcode.DEPTH), true
}
return nil, false
})
vm.estack.PushVal(42)
vm.estack.PushVal(42)
vm.estack.PushVal(hash.BytesBE())
vm.Context().hasDynamicInvoke = true
runVM(t, vm)
elem := vm.estack.Pop() // depth should be 2
assert.Equal(t, int64(2), elem.BigInt().Int64())
}
func TestSimpleCall(t *testing.T) {
progStr := "52c56b525a7c616516006c766b00527ac46203006c766b00c3616c756653c56b6c766b00527ac46c766b51527ac46203006c766b00c36c766b51c393616c7566"
result := 12