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vm: isolate stack in LoadScript

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When calling contract it must be provided with a new stack containing
only it's arguments. The result is then copied back on RET.

Fix #1220.
This commit is contained in:
Evgenii Stratonikov 2020-07-24 13:09:02 +03:00
parent 13b9eda08d
commit 466af55dea
2 changed files with 17 additions and 0 deletions
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16
pkg/core/interop_system_test.go
View file

@ -329,6 +329,7 @@ func getTestContractState() *state.Contract {
byte(opcode.ABORT), // abort if no offset was provided byte(opcode.ABORT), // abort if no offset was provided
byte(opcode.ADD), byte(opcode.RET), byte(opcode.ADD), byte(opcode.RET),
byte(opcode.PUSH7), byte(opcode.RET), byte(opcode.PUSH7), byte(opcode.RET),
byte(opcode.DROP), byte(opcode.RET),
} }
h := hash.Hash160(script) h := hash.Hash160(script)
m := manifest.NewManifest(h) m := manifest.NewManifest(h)
@ -348,6 +349,11 @@ func getTestContractState() *state.Contract {
Parameters: []manifest.Parameter{}, Parameters: []manifest.Parameter{},
ReturnType: smartcontract.IntegerType, ReturnType: smartcontract.IntegerType,
}, },
{
Name: "drop",
Offset: 5,
ReturnType: smartcontract.VoidType,
},
} }
return &state.Contract{ return &state.Contract{
Script: script, Script: script,
@ -375,6 +381,7 @@ func TestContractCall(t *testing.T) {
m := manifest.NewManifest(hash.Hash160(currScript)) m := manifest.NewManifest(hash.Hash160(currScript))
perm := manifest.NewPermission(manifest.PermissionHash, h) perm := manifest.NewPermission(manifest.PermissionHash, h)
perm.Methods.Add("add") perm.Methods.Add("add")
perm.Methods.Add("drop")
m.Permissions = append(m.Permissions, *perm) m.Permissions = append(m.Permissions, *perm)
require.NoError(t, ic.DAO.PutContractState(&state.Contract{ require.NoError(t, ic.DAO.PutContractState(&state.Contract{
@ -425,6 +432,15 @@ func TestContractCall(t *testing.T) {
t.Run("NotEnoughArguments", runInvalid( t.Run("NotEnoughArguments", runInvalid(
stackitem.NewArray([]stackitem.Item{stackitem.Make(1)}), "add", h.BytesBE())) stackitem.NewArray([]stackitem.Item{stackitem.Make(1)}), "add", h.BytesBE()))
}) })
t.Run("IsolatedStack", func(t *testing.T) {
initVM(v)
v.Estack().PushVal(stackitem.NewArray(nil))
v.Estack().PushVal("drop")
v.Estack().PushVal(h.BytesBE())
require.NoError(t, contractCall(ic, v))
require.Error(t, v.Run())
})
} }
func TestContractCreate(t *testing.T) { func TestContractCreate(t *testing.T) {

1
pkg/vm/vm.go
View file

@ -279,6 +279,7 @@ func (v *VM) LoadScript(b []byte) {
// LoadScriptWithFlags loads script and sets call flag to f. // LoadScriptWithFlags loads script and sets call flag to f.
func (v *VM) LoadScriptWithFlags(b []byte, f smartcontract.CallFlag) { func (v *VM) LoadScriptWithFlags(b []byte, f smartcontract.CallFlag) {
ctx := NewContext(b) ctx := NewContext(b)
v.estack = v.newItemStack("estack")
ctx.estack = v.estack ctx.estack = v.estack
ctx.tryStack = NewStack("exception") ctx.tryStack = NewStack("exception")
ctx.callFlag = f ctx.callFlag = f