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vm: implement stack isolation opcodes, fix #192

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This commit is contained in:
Roman Khimov 2019-10-25 17:25:46 +03:00
parent 2e99d65554
commit f0cffe0d3f
5 changed files with 307 additions and 67 deletions
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16
pkg/vm/context.go
View file

@ -19,6 +19,15 @@ type Context struct {
// Breakpoints. // Breakpoints.
breakPoints []int breakPoints []int
// Return value count, -1 is unspecified.
rvcount int
// Evaluation stack pointer.
estack *Stack
// Alt stack pointer.
astack *Stack
} }
// NewContext returns a new Context object. // NewContext returns a new Context object.
@ -26,6 +35,7 @@ func NewContext(b []byte) *Context {
return &Context{ return &Context{
prog: b, prog: b,
breakPoints: []int{}, breakPoints: []int{},
rvcount: -1,
} }
} }
@ -64,10 +74,14 @@ func (c *Context) Next() (Instruction, []byte, error) {
} }
numtoread = int(n) numtoread = int(n)
c.nextip += 4 c.nextip += 4
case JMP, JMPIF, JMPIFNOT, CALL: case JMP, JMPIF, JMPIFNOT, CALL, CALLED, CALLEDT:
numtoread = 2 numtoread = 2
case CALLI:
numtoread = 4
case APPCALL, TAILCALL: case APPCALL, TAILCALL:
numtoread = 20 numtoread = 20
case CALLE, CALLET:
numtoread = 22
default: default:
if instr >= PUSHBYTES1 && instr <= PUSHBYTES75 { if instr >= PUSHBYTES1 && instr <= PUSHBYTES75 {
numtoread = int(instr) numtoread = int(instr)

251
pkg/vm/instruction_string.go
View file

@ -187,68 +187,207 @@ func _() {
_ = x[HASKEY-203] _ = x[HASKEY-203]
_ = x[KEYS-204] _ = x[KEYS-204]
_ = x[VALUES-205] _ = x[VALUES-205]
_ = x[CALLI-224]
_ = x[CALLE-225]
_ = x[CALLED-226]
_ = x[CALLET-227]
_ = x[CALLEDT-228]
_ = x[THROW-240] _ = x[THROW-240]
_ = x[THROWIFNOT-241] _ = x[THROWIFNOT-241]
} }
const ( const _Instruction_name = "PUSH0PUSHBYTES1PUSHBYTES2PUSHBYTES3PUSHBYTES4PUSHBYTES5PUSHBYTES6PUSHBYTES7PUSHBYTES8PUSHBYTES9PUSHBYTES10PUSHBYTES11PUSHBYTES12PUSHBYTES13PUSHBYTES14PUSHBYTES15PUSHBYTES16PUSHBYTES17PUSHBYTES18PUSHBYTES19PUSHBYTES20PUSHBYTES21PUSHBYTES22PUSHBYTES23PUSHBYTES24PUSHBYTES25PUSHBYTES26PUSHBYTES27PUSHBYTES28PUSHBYTES29PUSHBYTES30PUSHBYTES31PUSHBYTES32PUSHBYTES33PUSHBYTES34PUSHBYTES35PUSHBYTES36PUSHBYTES37PUSHBYTES38PUSHBYTES39PUSHBYTES40PUSHBYTES41PUSHBYTES42PUSHBYTES43PUSHBYTES44PUSHBYTES45PUSHBYTES46PUSHBYTES47PUSHBYTES48PUSHBYTES49PUSHBYTES50PUSHBYTES51PUSHBYTES52PUSHBYTES53PUSHBYTES54PUSHBYTES55PUSHBYTES56PUSHBYTES57PUSHBYTES58PUSHBYTES59PUSHBYTES60PUSHBYTES61PUSHBYTES62PUSHBYTES63PUSHBYTES64PUSHBYTES65PUSHBYTES66PUSHBYTES67PUSHBYTES68PUSHBYTES69PUSHBYTES70PUSHBYTES71PUSHBYTES72PUSHBYTES73PUSHBYTES74PUSHBYTES75PUSHDATA1PUSHDATA2PUSHDATA4PUSHM1PUSH1PUSH2PUSH3PUSH4PUSH5PUSH6PUSH7PUSH8PUSH9PUSH10PUSH11PUSH12PUSH13PUSH14PUSH15PUSH16NOPJMPJMPIFJMPIFNOTCALLRETAPPCALLSYSCALLTAILCALLDUPFROMALTSTACKTOALTSTACKFROMALTSTACKXDROPXSWAPXTUCKDEPTHDROPDUPNIPOVERPICKROLLROTSWAPTUCKCATSUBSTRLEFTRIGHTSIZEINVERTANDORXOREQUALINCDECSIGNNEGATEABSNOTNZADDSUBMULDIVMODSHLSHRBOOLANDBOOLORNUMEQUALNUMNOTEQUALLTGTLTEGTEMINMAXWITHINSHA1SHA256HASH160HASH256CHECKSIGVERIFYCHECKMULTISIGARRAYSIZEPACKUNPACKPICKITEMSETITEMNEWARRAYNEWSTRUCTNEWMAPAPPENDREVERSEREMOVEHASKEYKEYSVALUESCALLICALLECALLEDCALLETCALLEDTTHROWTHROWIFNOT"
_Instruction_name_0 = "PUSH0PUSHBYTES1PUSHBYTES2PUSHBYTES3PUSHBYTES4PUSHBYTES5PUSHBYTES6PUSHBYTES7PUSHBYTES8PUSHBYTES9PUSHBYTES10PUSHBYTES11PUSHBYTES12PUSHBYTES13PUSHBYTES14PUSHBYTES15PUSHBYTES16PUSHBYTES17PUSHBYTES18PUSHBYTES19PUSHBYTES20PUSHBYTES21PUSHBYTES22PUSHBYTES23PUSHBYTES24PUSHBYTES25PUSHBYTES26PUSHBYTES27PUSHBYTES28PUSHBYTES29PUSHBYTES30PUSHBYTES31PUSHBYTES32PUSHBYTES33PUSHBYTES34PUSHBYTES35PUSHBYTES36PUSHBYTES37PUSHBYTES38PUSHBYTES39PUSHBYTES40PUSHBYTES41PUSHBYTES42PUSHBYTES43PUSHBYTES44PUSHBYTES45PUSHBYTES46PUSHBYTES47PUSHBYTES48PUSHBYTES49PUSHBYTES50PUSHBYTES51PUSHBYTES52PUSHBYTES53PUSHBYTES54PUSHBYTES55PUSHBYTES56PUSHBYTES57PUSHBYTES58PUSHBYTES59PUSHBYTES60PUSHBYTES61PUSHBYTES62PUSHBYTES63PUSHBYTES64PUSHBYTES65PUSHBYTES66PUSHBYTES67PUSHBYTES68PUSHBYTES69PUSHBYTES70PUSHBYTES71PUSHBYTES72PUSHBYTES73PUSHBYTES74PUSHBYTES75PUSHDATA1PUSHDATA2PUSHDATA4PUSHM1"
_Instruction_name_1 = "PUSH1PUSH2PUSH3PUSH4PUSH5PUSH6PUSH7PUSH8PUSH9PUSH10PUSH11PUSH12PUSH13PUSH14PUSH15PUSH16NOPJMPJMPIFJMPIFNOTCALLRETAPPCALLSYSCALLTAILCALLDUPFROMALTSTACKTOALTSTACKFROMALTSTACKXDROP"
_Instruction_name_2 = "XSWAPXTUCKDEPTHDROPDUPNIPOVERPICKROLLROTSWAPTUCKCATSUBSTRLEFTRIGHTSIZEINVERTANDORXOREQUAL"
_Instruction_name_3 = "INCDECSIGN"
_Instruction_name_4 = "NEGATEABSNOTNZADDSUBMULDIVMODSHLSHRBOOLANDBOOLORNUMEQUAL"
_Instruction_name_5 = "NUMNOTEQUALLTGTLTEGTEMINMAXWITHIN"
_Instruction_name_6 = "SHA1SHA256HASH160HASH256"
_Instruction_name_7 = "CHECKSIGVERIFYCHECKMULTISIG"
_Instruction_name_8 = "ARRAYSIZEPACKUNPACKPICKITEMSETITEMNEWARRAYNEWSTRUCTNEWMAPAPPENDREVERSEREMOVEHASKEYKEYSVALUES"
_Instruction_name_9 = "THROWTHROWIFNOT"
)
var ( var _Instruction_map = map[Instruction]string{
_Instruction_index_0 = [...]uint16{0, 5, 15, 25, 35, 45, 55, 65, 75, 85, 95, 106, 117, 128, 139, 150, 161, 172, 183, 194, 205, 216, 227, 238, 249, 260, 271, 282, 293, 304, 315, 326, 337, 348, 359, 370, 381, 392, 403, 414, 425, 436, 447, 458, 469, 480, 491, 502, 513, 524, 535, 546, 557, 568, 579, 590, 601, 612, 623, 634, 645, 656, 667, 678, 689, 700, 711, 722, 733, 744, 755, 766, 777, 788, 799, 810, 821, 830, 839, 848, 854} 0: _Instruction_name[0:5],
_Instruction_index_1 = [...]uint8{0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 51, 57, 63, 69, 75, 81, 87, 90, 93, 98, 106, 110, 113, 120, 127, 135, 150, 160, 172, 177} 1: _Instruction_name[5:15],
_Instruction_index_2 = [...]uint8{0, 5, 10, 15, 19, 22, 25, 29, 33, 37, 40, 44, 48, 51, 57, 61, 66, 70, 76, 79, 81, 84, 89} 2: _Instruction_name[15:25],
_Instruction_index_3 = [...]uint8{0, 3, 6, 10} 3: _Instruction_name[25:35],
_Instruction_index_4 = [...]uint8{0, 6, 9, 12, 14, 17, 20, 23, 26, 29, 32, 35, 42, 48, 56} 4: _Instruction_name[35:45],
_Instruction_index_5 = [...]uint8{0, 11, 13, 15, 18, 21, 24, 27, 33} 5: _Instruction_name[45:55],
_Instruction_index_6 = [...]uint8{0, 4, 10, 17, 24} 6: _Instruction_name[55:65],
_Instruction_index_7 = [...]uint8{0, 8, 14, 27} 7: _Instruction_name[65:75],
_Instruction_index_8 = [...]uint8{0, 9, 13, 19, 27, 34, 42, 51, 57, 63, 70, 76, 82, 86, 92} 8: _Instruction_name[75:85],
_Instruction_index_9 = [...]uint8{0, 5, 15} 9: _Instruction_name[85:95],
) 10: _Instruction_name[95:106],
11: _Instruction_name[106:117],
12: _Instruction_name[117:128],
13: _Instruction_name[128:139],
14: _Instruction_name[139:150],
15: _Instruction_name[150:161],
16: _Instruction_name[161:172],
17: _Instruction_name[172:183],
18: _Instruction_name[183:194],
19: _Instruction_name[194:205],
20: _Instruction_name[205:216],
21: _Instruction_name[216:227],
22: _Instruction_name[227:238],
23: _Instruction_name[238:249],
24: _Instruction_name[249:260],
25: _Instruction_name[260:271],
26: _Instruction_name[271:282],
27: _Instruction_name[282:293],
28: _Instruction_name[293:304],
29: _Instruction_name[304:315],
30: _Instruction_name[315:326],
31: _Instruction_name[326:337],
32: _Instruction_name[337:348],
33: _Instruction_name[348:359],
34: _Instruction_name[359:370],
35: _Instruction_name[370:381],
36: _Instruction_name[381:392],
37: _Instruction_name[392:403],
38: _Instruction_name[403:414],
39: _Instruction_name[414:425],
40: _Instruction_name[425:436],
41: _Instruction_name[436:447],
42: _Instruction_name[447:458],
43: _Instruction_name[458:469],
44: _Instruction_name[469:480],
45: _Instruction_name[480:491],
46: _Instruction_name[491:502],
47: _Instruction_name[502:513],
48: _Instruction_name[513:524],
49: _Instruction_name[524:535],
50: _Instruction_name[535:546],
51: _Instruction_name[546:557],
52: _Instruction_name[557:568],
53: _Instruction_name[568:579],
54: _Instruction_name[579:590],
55: _Instruction_name[590:601],
56: _Instruction_name[601:612],
57: _Instruction_name[612:623],
58: _Instruction_name[623:634],
59: _Instruction_name[634:645],
60: _Instruction_name[645:656],
61: _Instruction_name[656:667],
62: _Instruction_name[667:678],
63: _Instruction_name[678:689],
64: _Instruction_name[689:700],
65: _Instruction_name[700:711],
66: _Instruction_name[711:722],
67: _Instruction_name[722:733],
68: _Instruction_name[733:744],
69: _Instruction_name[744:755],
70: _Instruction_name[755:766],
71: _Instruction_name[766:777],
72: _Instruction_name[777:788],
73: _Instruction_name[788:799],
74: _Instruction_name[799:810],
75: _Instruction_name[810:821],
76: _Instruction_name[821:830],
77: _Instruction_name[830:839],
78: _Instruction_name[839:848],
79: _Instruction_name[848:854],
81: _Instruction_name[854:859],
82: _Instruction_name[859:864],
83: _Instruction_name[864:869],
84: _Instruction_name[869:874],
85: _Instruction_name[874:879],
86: _Instruction_name[879:884],
87: _Instruction_name[884:889],
88: _Instruction_name[889:894],
89: _Instruction_name[894:899],
90: _Instruction_name[899:905],
91: _Instruction_name[905:911],
92: _Instruction_name[911:917],
93: _Instruction_name[917:923],
94: _Instruction_name[923:929],
95: _Instruction_name[929:935],
96: _Instruction_name[935:941],
97: _Instruction_name[941:944],
98: _Instruction_name[944:947],
99: _Instruction_name[947:952],
100: _Instruction_name[952:960],
101: _Instruction_name[960:964],
102: _Instruction_name[964:967],
103: _Instruction_name[967:974],
104: _Instruction_name[974:981],
105: _Instruction_name[981:989],
106: _Instruction_name[989:1004],
107: _Instruction_name[1004:1014],
108: _Instruction_name[1014:1026],
109: _Instruction_name[1026:1031],
114: _Instruction_name[1031:1036],
115: _Instruction_name[1036:1041],
116: _Instruction_name[1041:1046],
117: _Instruction_name[1046:1050],
118: _Instruction_name[1050:1053],
119: _Instruction_name[1053:1056],
120: _Instruction_name[1056:1060],
121: _Instruction_name[1060:1064],
122: _Instruction_name[1064:1068],
123: _Instruction_name[1068:1071],
124: _Instruction_name[1071:1075],
125: _Instruction_name[1075:1079],
126: _Instruction_name[1079:1082],
127: _Instruction_name[1082:1088],
128: _Instruction_name[1088:1092],
129: _Instruction_name[1092:1097],
130: _Instruction_name[1097:1101],
131: _Instruction_name[1101:1107],
132: _Instruction_name[1107:1110],
133: _Instruction_name[1110:1112],
134: _Instruction_name[1112:1115],
135: _Instruction_name[1115:1120],
139: _Instruction_name[1120:1123],
140: _Instruction_name[1123:1126],
141: _Instruction_name[1126:1130],
143: _Instruction_name[1130:1136],
144: _Instruction_name[1136:1139],
145: _Instruction_name[1139:1142],
146: _Instruction_name[1142:1144],
147: _Instruction_name[1144:1147],
148: _Instruction_name[1147:1150],
149: _Instruction_name[1150:1153],
150: _Instruction_name[1153:1156],
151: _Instruction_name[1156:1159],
152: _Instruction_name[1159:1162],
153: _Instruction_name[1162:1165],
154: _Instruction_name[1165:1172],
155: _Instruction_name[1172:1178],
156: _Instruction_name[1178:1186],
158: _Instruction_name[1186:1197],
159: _Instruction_name[1197:1199],
160: _Instruction_name[1199:1201],
161: _Instruction_name[1201:1204],
162: _Instruction_name[1204:1207],
163: _Instruction_name[1207:1210],
164: _Instruction_name[1210:1213],
165: _Instruction_name[1213:1219],
167: _Instruction_name[1219:1223],
168: _Instruction_name[1223:1229],
169: _Instruction_name[1229:1236],
170: _Instruction_name[1236:1243],
172: _Instruction_name[1243:1251],
173: _Instruction_name[1251:1257],
174: _Instruction_name[1257:1270],
192: _Instruction_name[1270:1279],
193: _Instruction_name[1279:1283],
194: _Instruction_name[1283:1289],
195: _Instruction_name[1289:1297],
196: _Instruction_name[1297:1304],
197: _Instruction_name[1304:1312],
198: _Instruction_name[1312:1321],
199: _Instruction_name[1321:1327],
200: _Instruction_name[1327:1333],
201: _Instruction_name[1333:1340],
202: _Instruction_name[1340:1346],
203: _Instruction_name[1346:1352],
204: _Instruction_name[1352:1356],
205: _Instruction_name[1356:1362],
224: _Instruction_name[1362:1367],
225: _Instruction_name[1367:1372],
226: _Instruction_name[1372:1378],
227: _Instruction_name[1378:1384],
228: _Instruction_name[1384:1391],
240: _Instruction_name[1391:1396],
241: _Instruction_name[1396:1406],
}
func (i Instruction) String() string { func (i Instruction) String() string {
switch { if str, ok := _Instruction_map[i]; ok {
case 0 <= i && i <= 79: return str
return _Instruction_name_0[_Instruction_index_0[i]:_Instruction_index_0[i+1]]
case 81 <= i && i <= 109:
i -= 81
return _Instruction_name_1[_Instruction_index_1[i]:_Instruction_index_1[i+1]]
case 114 <= i && i <= 135:
i -= 114
return _Instruction_name_2[_Instruction_index_2[i]:_Instruction_index_2[i+1]]
case 139 <= i && i <= 141:
i -= 139
return _Instruction_name_3[_Instruction_index_3[i]:_Instruction_index_3[i+1]]
case 143 <= i && i <= 156:
i -= 143
return _Instruction_name_4[_Instruction_index_4[i]:_Instruction_index_4[i+1]]
case 158 <= i && i <= 165:
i -= 158
return _Instruction_name_5[_Instruction_index_5[i]:_Instruction_index_5[i+1]]
case 167 <= i && i <= 170:
i -= 167
return _Instruction_name_6[_Instruction_index_6[i]:_Instruction_index_6[i+1]]
case 172 <= i && i <= 174:
i -= 172
return _Instruction_name_7[_Instruction_index_7[i]:_Instruction_index_7[i+1]]
case 192 <= i && i <= 205:
i -= 192
return _Instruction_name_8[_Instruction_index_8[i]:_Instruction_index_8[i+1]]
case 240 <= i && i <= 241:
i -= 240
return _Instruction_name_9[_Instruction_index_9[i]:_Instruction_index_9[i+1]]
default:
return "Instruction(" + strconv.FormatInt(int64(i), 10) + ")"
} }
return "Instruction(" + strconv.FormatInt(int64(i), 10) + ")"
} }

12
pkg/vm/instructions.go
View file

@ -202,12 +202,12 @@ const (
KEYS Instruction = 0xCC KEYS Instruction = 0xCC
VALUES Instruction = 0xCD VALUES Instruction = 0xCD
// Stack isolation (intentionally left out, see #362) // Stack isolation
// CALL_I Instruction = 0xE0 CALLI Instruction = 0xE0
// CALL_E Instruction = 0xE1 CALLE Instruction = 0xE1
// CALL_ED Instruction = 0xE2 CALLED Instruction = 0xE2
// CALL_ET Instruction = 0xE3 CALLET Instruction = 0xE3
// CALL_EDT Instruction = 0xE4 CALLEDT Instruction = 0xE4
// Exceptions // Exceptions
THROW Instruction = 0xF0 THROW Instruction = 0xF0

93
pkg/vm/vm.go
View file

@ -200,7 +200,7 @@ func (v *VM) Load(prog []byte) {
v.istack.Clear() v.istack.Clear()
v.estack.Clear() v.estack.Clear()
v.astack.Clear() v.astack.Clear()
v.istack.PushVal(NewContext(prog)) v.LoadScript(prog)
} }
// LoadScript loads a script from the internal script table. It // LoadScript loads a script from the internal script table. It
@ -208,6 +208,8 @@ func (v *VM) Load(prog []byte) {
// the invocation stack and starts executing it. // the invocation stack and starts executing it.
func (v *VM) LoadScript(b []byte) { func (v *VM) LoadScript(b []byte) {
ctx := NewContext(b) ctx := NewContext(b)
ctx.estack = v.estack
ctx.astack = v.astack
v.istack.PushVal(ctx) v.istack.PushVal(ctx)
} }
@ -993,7 +995,9 @@ func (v *VM) execute(ctx *Context, op Instruction, parameter []byte) (err error)
} }
case CALL: case CALL:
v.istack.PushVal(ctx.Copy()) newCtx := ctx.Copy()
newCtx.rvcount = -1
v.istack.PushVal(newCtx)
err = v.execute(v.Context(), JMP, parameter) err = v.execute(v.Context(), JMP, parameter)
if err != nil { if err != nil {
return return
@ -1030,9 +1034,29 @@ func (v *VM) execute(ctx *Context, op Instruction, parameter []byte) (err error)
v.LoadScript(script) v.LoadScript(script)
case RET: case RET:
_ = v.istack.Pop() oldCtx := v.istack.Pop().Value().(*Context)
rvcount := oldCtx.rvcount
oldEstack := v.estack
if rvcount > 0 && oldEstack.Len() < rvcount {
panic("missing some return elements")
}
if v.istack.Len() == 0 { if v.istack.Len() == 0 {
v.state = haltState v.state = haltState
break
}
newEstack := v.Context().estack
if oldEstack != newEstack {
if rvcount < 0 {
rvcount = oldEstack.Len()
}
for i := rvcount; i > 0; i-- {
elem := oldEstack.RemoveAt(i - 1)
newEstack.Push(elem)
}
v.estack = newEstack
v.astack = v.Context().astack
} }
case CHECKSIG, VERIFY: case CHECKSIG, VERIFY:
@ -1186,6 +1210,69 @@ func (v *VM) execute(ctx *Context, op Instruction, parameter []byte) (err error)
case NOP: case NOP:
// unlucky ^^ // unlucky ^^
case CALLI, CALLE, CALLED, CALLET, CALLEDT:
var (
tailCall = (op == CALLET || op == CALLEDT)
hashOnStack = (op == CALLED || op == CALLEDT)
addElement int
newCtx *Context
)
if hashOnStack {
addElement = 1
}
rvcount := int(parameter[0])
pcount := int(parameter[1])
if v.estack.Len() < pcount+addElement {
panic("missing some parameters")
}
if tailCall && ctx.rvcount != rvcount {
panic("context and parameter rvcount mismatch")
}
if op == CALLI {
newCtx = ctx.Copy()
} else {
var hashBytes []byte
if hashOnStack {
hashBytes = v.estack.Pop().Bytes()
} else {
hashBytes = parameter[2:]
}
hash, err := util.Uint160DecodeBytes(hashBytes)
if err != nil {
panic(err)
}
script := v.getScript(hash)
if script == nil {
panic(fmt.Sprintf("could not find script %s", hash))
}
newCtx = NewContext(script)
}
newCtx.rvcount = rvcount
newCtx.estack = NewStack("evaluation")
newCtx.astack = NewStack("alt")
// Going backwards to naturally push things onto the new stack.
for i := pcount; i > 0; i-- {
elem := v.estack.RemoveAt(i - 1)
newCtx.estack.Push(elem)
}
if tailCall {
_ = v.istack.Pop()
}
v.istack.PushVal(newCtx)
v.estack = newCtx.estack
v.astack = newCtx.astack
if op == CALLI {
err = v.execute(v.Context(), JMP, parameter[2:])
if err != nil {
return
}
}
case THROW: case THROW:
panic("THROW") panic("THROW")

2
pkg/vm/vm_test.go
View file

@ -2015,7 +2015,7 @@ func makeProgram(opcodes ...Instruction) []byte {
func load(prog []byte) *VM { func load(prog []byte) *VM {
vm := New() vm := New()
vm.istack.PushVal(NewContext(prog)) vm.LoadScript(prog)
return vm return vm
} }