-
Notifications
You must be signed in to change notification settings - Fork 11
/
bnarly.js
1644 lines (1411 loc) · 43.1 KB
/
bnarly.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
var bnarly = (function() {
var bInfo = (function(){
var N= navigator.appName, ua= navigator.userAgent, tem;
var M= ua.match(/(opera|chrome|safari|firefox|msie)\/?\s*(\.?\d+(\.\d+)*)/i);
if(M && (tem= ua.match(/version\/([\.\d]+)/i))!= null) M[2]= tem[1];
M= M? [M[1], M[2]]: [N, navigator.appVersion, '-?'];
M = {
"name": M[0],
"version": M[1],
"type": (window.navigator.platform.indexOf("64") == -1 ? "x86" : "x64")
};
// stupid userAgent change with IE11
if(M["name"] == "Netscape" && window.navigator.userAgent.indexOf("Trident") != -1) {
M["name"] = "MSIE";
}
return M;
})();
if(!String.prototype.trim) {
String.prototype.trim = function () {
return this.replace(/^\s+|\s+$/g,'');
};
}
if (!Array.prototype.indexOf)
{
Array.prototype.indexOf = function(elt /*, from*/) {
var len = this.length >>> 0;
var from = Number(arguments[1]) || 0;
from = (from < 0)? Math.ceil(from): Math.floor(from);
if (from < 0) {
from += len;
}
for (; from < len; from++) {
if (from in this && this[from] === elt) {
return from;
}
}
return -1;
};
}
function argsToArray(args) {
// assumes commands is actually an arguments object
if(typeof args == "object") {
args = Array.prototype.slice.call(args, 0 );
}
return args;
}
function toInt(str) {
str = str.replace("`", "");
var addr = parseInt(str, 16);
return addr;
}
/*
Convert the given object to a windbg value. If the argument is a string,
it is assumed that the obj is a symbol or other non-int resolvable
value (eg @$scopeip, @$t3, etc).
*/
function toWAddr(obj) {
if(typeof obj == "string") {
return obj;
} else if(typeof obj == "number") {
return "0n" + obj;
} else {
throw "Unrecognized address object!";
}
}
function getKeys(obj){
var keys = [];
for(var key in obj){
keys.push(key);
}
return keys;
}
function _escapeForQuoted(str, quoteChar) {
if(quoteChar == undefined) { quoteChar = '"'; }
str = str.replace(/\\/g, "\\\\");
str = str.replace(new RegExp(quoteChar, "g"), "\\"+quoteChar);
return str;
}
var e4q = _escapeForQuoted;
var EVAL_WINDOW = window;
var SHOWED_SYMBOL_ERROR = false;
var MEM_STR_SIZE = 0x800000;
var DEFAULTS = {
"MSIE": "10_x86",
"Firefox": "25_x86"
};
function initMemStr() {
mem_str_init = '' +
'window.mem_str = "";' +
'window.mem_str_size = ' + MEM_STR_SIZE + ';' +
'(function() {' +
'window.mem_str = "A";' +
'while(window.mem_str.length < window.mem_str_size/2) {' +
'window.mem_str += window.mem_str;' +
'}' +
'window.mem_str = "BNARLY_MEMORY_STRING" + window.mem_str;' +
(bInfo.name == "MSIE" ?
"window.mem_str = window.mem_str.substring(0, window.mem_str_size/2);" :
'window.mem_str = ["",window.mem_str.substring(0, window.mem_str_size/2)].join("");'
) +
'})();'
EVAL_WINDOW.eval(mem_str_init);
}
initMemStr();
/*
-----------------------------------------------------------
SETUP FUNCTIONS
-----------------------------------------------------------
*/
function init() {
initSymbolCache();
}
/*
Set the window that the debugger will be attached to.
*/
function setMainWindow(win) {
EVAL_WINDOW = win;
initMemStr();
}
var USE_SYMBOL_CACHE = true;
var SYMBOL_CACHE = {};
/*
Set whether a symbol cache should be used
*/
function setUseSymbolCache(trueFalse) {
USE_SYMBOL_CACHE = trueFalse;
}
/*
Populate the symbol cache with vftable symbols from "popular" browser
modules (eg mshtml!*vftable* and jscript9!*vftable*)
*/
function populateSymbolCache() {
if(!USE_SYMBOL_CACHE) { return; }
var popularSymbolModules = {
"MSIE": {
"default": ["mshtml", "jscript9"],
"8_x86": ["mshtml", "jscript"]
},
"Firefox": {
"default": ["xul"]
}
};
var modChoices = popularSymbolModules[bInfo.name];
var mods = modChoices[getBrowserVersion()];
if(mods == undefined) {
mods = modChoices["default"];
}
for(var i = 0; i < mods.length; i++) {
var mod = mods[i];
var output = evalRaw("x " + mod + "!*vftable*");
_addSymbolsToCache(output);
}
}
function _addSymbolsToCache(output) {
var lines = output.split("\n");
var regex = /([a-f0-9]+) (.*vftable').*/;
for(var i = 0; i < lines.length; i++) {
var line = lines[i];
var match = regex.exec(line);
if(match == null) { break; }
var addr = parseInt(match[1], 16);
var symbol = match[2];
SYMBOL_CACHE[addr] = symbol;
}
}
/*
-----------------------------------------------------------
SETUP FUNCTIONS
-----------------------------------------------------------
*/
/*
Return the name/family of the browser. Eg: MSIE
*/
function getBrowserName() {
return bInfo.name;
}
/*
Return a string that represents the version of the browser. Eg: 10_x86
*/
function getBrowserVersion() {
var majorVersion = bInfo.version.split(".")[0];
var type = bInfo.type;
var version = majorVersion + "_" + type;
return version;
}
/*
Return the symbol server locations that should be in `.sympath` in order for
bNarly to work correctly.
*/
function getSymbolServerLocations() {
var locations = {
"MSIE": ["http://msdl.microsoft.com/download/symbols"],
"Firefox": ["http://symbols.mozilla.org/firefox"],
"Chrome": ["http://chromium-browser-symsrv.commondatastorage.googleapis.com","http://msdl.microsoft.com/download/symbols"],
};
var loc = locations[bInfo.name];
if(!loc) { loc = null; }
return loc;
};
function isConnected() {
var output = evalRaw(".echo connection test");
return output.trim() == "connection test";
}
// ----------------------- Alloc Track
function getAllocTrackBreakpoint() {
var handlers = {
"MSIE": _getMSIEAllocTrackBreakpoint,
"Firefox": _getFirefoxAllocTrackBreakpoint
};
if(!handlers[bInfo.name]) {
return null;
}
return handlers[bInfo.name](bInfo);
}
function _getMSIEAllocTrackBreakpoint(info) {
var key = getBrowserVersion();
var breakpoints = {
"10_x86": {
addr: 'ntdll!RtlAllocateHeap+e6',
commands: [
'.if(eax != 0) {',
'.printf "ALLOC heap: %08x, size: %08x, addr: %08x\\n", poi(esp+4), poi(esp+c), eax ;',
'} ;',
'g'
].join(" ")
}
};
var breakpoint = breakpoints[key];
if(!breakpoint) { breakpoint = breakpoints[DEFAULTS["MSIE"]]; }
return breakpoint;
}
function _getFirefoxAllocTrackBreakpoint(info) {
var key = getBrowserVersion();
var breakpoints = {
"25_x86": {
addr: 'mozglue!je_malloc+0x41',
commands: [
'.if(eax != 0) {',
'.printf "ALLOC size: %08x, addr: %08x\\n", poi(esp+4), eax',
'} ;',
'g'
].join(" ")
}
};
var breakpoint = breakpoints[key];
if(!breakpoint) { breakpoint = breakpoints[DEFAULTS["Firefox"]]; }
return breakpoint;
}
// ----------------------- Free Track
function getFreeTrackBreakpoint() {
var handlers = {
"MSIE": _getMSIEFreeTrackBreakpoint,
"Firefox": _getFirefoxFreeTrackBreakpoint
};
if(!handlers[bInfo.name]) {
return null;
}
return handlers[bInfo.name](bInfo);
}
function _getMSIEFreeTrackBreakpoint(info) {
var key = getBrowserVersion();
var breakpoints = {
"10_x86": {
addr: 'ntdll!RtlFreeHeap',
commands: [
'.if($vvalid(poi(esp+c),1)) {',
'.printf "FREE heap: %08x, addr: %08x, firstPtr: %08x\\n", poi(esp+4), poi(esp+c), poi(poi(esp+c))',
'} .else {',
'.printf "FREE heap: %08x, addr: %08x\\n", poi(esp+4), poi(esp+c)',
'} ;',
'g'
].join(" ")
}
};
var breakpoint = breakpoints[key];
if(!breakpoint) { breakpoint = breakpoints[DEFAULTS["MSIE"]]; }
return breakpoint;
}
function _getFirefoxFreeTrackBreakpoint(info) {
var key = getBrowserVersion();
var breakpoints = {
"25_x86": {
addr: 'mozglue!je_free',
commands: [
'.if(poi(esp+4) != 0) {',
'.if($vvalid(poi(esp+4),1)) {',
'.printf "FREE addr: %08x, firstPtr: %08x\\n", poi(esp+4), poi(poi(esp+4))',
'} .else {',
'.printf "FREE addr: %08x\\n", poi(esp+4)',
'}',
'} ;',
'g'
].join(" ")
}
};
var breakpoint = breakpoints[key];
if(!breakpoint) { breakpoint = breakpoints[DEFAULTS["Firefox"]]; }
return breakpoint;
}
// ----------------------- Main Windbg Breakpoint
/*
Return the breakpoint for the current browser. If a breakpoint for the current
version has not been explicitly defined, return the default breakpoint for
the browser family.
*/
function getWindbgBreakpoint() {
var handlers = {
"Chrome": _getChromeWindbgBreakpoint,
"MSIE": _getMSIEWindbgBreakpoint,
"Firefox": _getFirefoxWindbgBreakpoint
};
if(!handlers[bInfo.name]) {
return null;
}
return handlers[bInfo.name](bInfo);
};
function _getChromeWindbgBreakpoint(info) {
return null;
};
function _getMSIEWindbgBreakpoint(info) {
var key = getBrowserVersion();
/*
-First argument to Math.min must be 111111, else breakpoint merely continues
-Second argument to Math.min is the command to execute
-Third argument to Math.min is the (optional) out string
@$t0 will be set to the fourth argument, if a fourth argument exists
*/
var breakpoints = {
"11_x86": ['bu jscript9!Js::Math::Min "',
// evaluate windbg commands
'.if(poi(esp+10) == 0n222223) {',
// if a fourth argument was passed in, save its pointer in @$t0
'.if((poi(esp+8) & 0xff) > 4) {',
'r @$t0 = poi(esp+1c)',
'} ;',
// write windbg commands found in second parameter to cmd_to_exec.txt
'.writemem cmd_to_exec.txt poi(poi(esp+14)+c) L?(poi(poi(esp+14)+8)*2) ;',
// execute windbg commands
'$$><cmd_to_exec.txt ;',
// read the output from executed commands back into the third argument (a string)
'.if((poi(esp+8) & 0xff) > 3) {',
'.readmem output.txt poi(poi(esp+18)+c) L?' + toWAddr(MEM_STR_SIZE) + ' ;',
'g',
'}',
// simple logging
'} .elsif(poi(esp+10) == 0n444445) {',
'.printf \\"%mu\\\\n\\", poi(poi(esp+14)+c) ;',
'g',
'} .else {',
'g',
'}',
'"'].join(" "),
"10_x86": ['bu jscript9!Js::Math::Min "',
// evaluate windbg commands
'.if(poi(esp+10) == 0n222223) {',
// if a fourth argument was passed in, save its pointer in @$t0
'.if((poi(esp+8) & 0xff) > 4) {',
'r @$t0 = poi(esp+1c)',
'} ;',
// write windbg commands found in second parameter to cmd_to_exec.txt
'.writemem cmd_to_exec.txt poi(poi(esp+14)+c) L?(poi(poi(esp+14)+8)*2) ;',
// execute windbg commands
'$$><cmd_to_exec.txt ;',
// read the output from executed commands back into the third argument (a string)
'.if((poi(esp+8) & 0xff) > 3) {',
'.readmem output.txt poi(poi(esp+18)+c) L?' + toWAddr(MEM_STR_SIZE) + ' ;',
'g',
'}',
// simple logging
'} .elsif(poi(esp+10) == 0n444445) {',
'.printf \\"%mu\\\\n\\", poi(poi(esp+14)+c) ;',
'g',
'} .else {',
'g',
'}',
'"'].join(" "),
// this will happen with TabProcGrowth=0 on x64 systems
// "10_x64": TODO
"9_x86": ['bu jscript9!Js::Math::Min "',
// evaluate windbg commands
'.if(poi(esp+10) == 0n222223) {',
// if a fourth argument was passed in, save its pointer in @$t0
'.if((poi(esp+8) & 0xff) > 4) {',
'r @$t0 = poi(esp+1c)', // TODO
'} ;',
// write windbg commands found in second parameter to cmd_to_exec.txt
'.writemem cmd_to_exec.txt poi(poi(esp+14)+c) L?(poi(poi(esp+14)+8)*2) ;',
// execute windbg commands
'$$><cmd_to_exec.txt ;',
// read the output from executed commands back into the third argument (a string)
'.if((poi(esp+8) & 0xff) > 3) {',
'.readmem output.txt poi(poi(esp+18)+c) L?' + toWAddr(MEM_STR_SIZE) + ' ;',
'g',
'}',
// simple logging
'} .elsif(poi(esp+10) == 0n444445) {',
'.printf \\"%mu\\\\n\\", poi(poi(esp+14)+c) ;',
'g',
'} .else {',
'g',
'}',
'"'].join(" "),
// this will happen with TabProcGrowth=0 on x64 systems
//"9_x64": TODO
"8_x86": ['r @$t7 = 0 ;', 'bu jscript!JsMin "',
// args are pushed from right to left
// poi(esp+10) == argcount
// poi(esp+14) == args array. Each item in array is size 0x10, with val at +8
// last element in array (first argument to Math.min) is:
// ARG ARRAY BASE
'r @$t1 = poi(esp+14)+8 ;',
// arg count
'r @$t2 = poi(esp+10) & 0xff ;',
// first arg
'r @$t3 = poi(@$t1+((@$t2-1)*10)) ;',
// stupid hack to get a reference to the mem_str before it gets wiped
// off the stack
'.if(@$t7 == 0) {',
'r @$t7 = poi(esp-0x22a4)',
'} ;',
'.if(@$t2 < 2) {',
'g',
'} .else {',
// evaluate windbg commands
'.if(@$t3 == 0n111111) {',
// if a fourth argument was passed in, save its pointer in @$t0
'.if(@$t2 > 3) {',
'r @$t0 = poi(poi(@$t1+((@$t2-4)*10))+8)',
'} ;',
// write windbg commands found in second parameter to cmd_to_exec.txt
'.writemem cmd_to_exec.txt poi(poi(@$t1+((@$t2-2)*10))+8) L?poi(poi(poi(@$t1+((@$t2-2)*10))+8)-4) ;',
// execute windbg commands
'$$><cmd_to_exec.txt ;',
// read the output from executed commands back into the third argument (a string)
'.if(@$t2 > 2) {',
// not sure of the specifics on this, but I think this string is just a copy
// and not the original string.
//'.readmem output.txt poi(poi(@$t1+((@$t2-3)*10))+8) L?' + toWAddr(MEM_STR_SIZE) + ' ;',
//
// the only other BNARLY_MEMORY_STRING can be found at poi(esp-0x22a4)
// UNTIL IT GETS WIPED OFF THE STACK!
//'.readmem output.txt poi(esp-0x22a4) L?' + toWAddr(MEM_STR_SIZE) + ' ;',
//
// use @$t7 instead :^)
'.readmem output.txt @$t7 L?' + toWAddr(MEM_STR_SIZE) + ' ;',
'g',
'}',
// simple logging
'} .elsif(@$t3 == 0n222222) {',
'.printf \\"%mu\\\\n\\", poi(poi(@$t1+((@$t2-2)*10))+8) ;',
'g',
'} .else {',
'g',
'}',
'}',
'"'].join(" "),
//"8_x64": TODO
};
var breakpoint = breakpoints[key];
if(!breakpoint) { breakpoint = breakpoints[DEFAULTS["MSIE"]]; }
return breakpoint;
};
function _getFirefoxWindbgBreakpoint(v) {
var key = getBrowserVersion();
var breakpoints = {
"25_x86": ['bu mozjs!js_math_min "',
// evaluate windbg commands
'.if(poi(poi(esp+c)+10) == 0n111111) {',
// if a fourth argument was passed in, save its pointer in @$t0
'.if((poi(esp+8) & 0xff) > 3) {',
'r @$t0 = poi(poi(esp+c)+28)',
'} ;',
// write windbg commands found in second parameter to cmd_to_exec.txt
'.writemem cmd_to_exec.txt poi(poi(poi(esp+c)+18)+4) L?((poi(poi(poi(esp+c)+18))>>4)*2) ;',
// execute windbg commands
'$$><cmd_to_exec.txt ;',
// read the output from executed commands back into the third argument (a string)
'.if((poi(esp+8) & 0xff) > 2) {',
'.readmem output.txt poi(poi(poi(esp+c)+20)+4) L?' + toWAddr(MEM_STR_SIZE) + ' ;',
'g',
'}',
// simple logging
'} .elsif(poi(poi(esp+c)+10) == 0n222222) {',
'.printf \\"%mu\\\\n\\", poi(poi(poi(esp+c)+18)+4) ;',
'g',
'} .else {',
'g',
'}',
'"'].join(" ")
}
var breakpoint = breakpoints[key];
if(!breakpoint) { breakpoint = breakpoints[DEFAULTS["Firefox"]]; }
return breakpoint;
};
/*
-----------------------------------------------------------
UTILITY FUNCTIONS
-----------------------------------------------------------
*/
/*
Force execution to pause
*/
function int3() {
run(".echo INT3");
}
/*
Print the message and continue. This method should be safe for ANY message content
without needing to escape anything.
*/
function log(msg) {
msg = msg.substr(0, msg.length);
EVAL_WINDOW.Math.min(222222, msg);
};
/*
-----------------------------------------------------------
CANDY FUNCTIONS
-----------------------------------------------------------
*/
/*
Evaluate the given expression and return the result. The result will *always*
be a number. This is the same as running the windbg command:
`? <expression>`
*/
function evalExpr(expression) {
var res = evalRaw("? " + expression);
return _getEvalExprInt(res);
};
function _getEvalExprInt(output) {
var regex = /Evaluate expression: ([0-9]+) = ([a-f0-9]+)/g;
var match = regex.exec(output);
return parseInt(match[1]);
};
/*
Run the `cmd` without waiting for the created process to exit
*/
function shell(cmd) {
run('.block { .shell -ci ".echo blah" start ' + cmd + '} ; g');
};
var heapAllocBpId = null;
var heapFreeBpId = null;
/*
Begin tracking heap allocs/frees. Retrieve tracked heap events by calling
`stopHeapTracking()`
*/
function startHeapTracking() {
var allocBp = getAllocTrackBreakpoint();
var freeBp = getFreeTrackBreakpoint();
heapFreeBpId = setBreakpoint(freeBp.addr, freeBp.commands);
heapAllocBpId = setBreakpoint(allocBp.addr, allocBp.commands);
run(".logopen /u output.txt", "g");
}
function _parseHeapTrackingEvent(output) {
/*
ALLOC heap: 00680000, size: 00001000, addr: 00000000
FREE heap: 00680000, addr: 04a27470
*/
var heapTypeRegex = /(FREE|ALLOC) (.*)/;
var match = heapTypeRegex.exec(output);
if(match == null) { return null; }
eventInfo = {
type: match[1]
};
var itemRegex = /([\w]+): ([a-f0-9]+)/;
var items = match[2].split(",");
for(var i = 0; i < items.length; i++) {
var item = items[i];
var match = itemRegex.exec(item);
if(match == null) { break; }
eventInfo[match[1]] = parseInt(match[2], 16);
}
return eventInfo;
}
function _processHeapEvents(output, timeline, unAllocatedFrees, unFreedAllocs) {
var lines = output.split("\n");
for(var i = 0; i < lines.length; i++) {
var line = lines[i];
var info = _parseHeapTrackingEvent(line);
if(info == null) { break; }
info.symbol = "";
if(info.firstPtr) {
info.symbol = info.firstPtr;
} else {
info.firstPtr = null;
}
if(info.type == "FREE") {
if(unFreedAllocs[info.addr]) {
delete unFreedAllocs[info.addr];
} else {
unAllocatedFrees[info.addr] = info;
}
} else if(info.type == "ALLOC") {
unFreedAllocs[info.addr] = info;
} else {
continue;
}
timeline.push(info);
}
}
function _resolveFreeEventSymbols(timeline) {
var freedSymbolsToFetch = [];
var freeEvents = [];
for(var i = 0; i < timeline.length; i++) {
var heapEvent = timeline[i];
if(heapEvent.type != "FREE") { continue; }
if(heapEvent.firstPtr == null) { continue; }
freedSymbolsToFetch.push(heapEvent.firstPtr);
freeEvents.push(heapEvent);
}
var freedSymbolsResults = getSymbols(freedSymbolsToFetch);
for(var i = 0; i < freeEvents.length; i++) {
var freeEvent = freeEvents[i];
var symbol = freedSymbolsResults[freeEvent.firstPtr];
if(symbol == "" && freeEvent.firstPtr != null) {
symbol = freeEvent.firstPtr;
}
freeEvent.symbol = symbol;
}
}
function _resolveAllocEventSymbols(unFreedAllocs) {
var allocationDpps = [];
var allocationEvents = [];
for(var addr in unFreedAllocs) {
addr = parseInt(addr);
var allocEvent = unFreedAllocs[addr];
allocationEvents.push(allocEvent);
allocationDpps.push("dpp " + toWAddr(addr) + " L?1");
}
var dppResults = evalRaws.apply(this, allocationDpps);
var toFetchSymbols = [];
var toFetchSymbolsEvents = [];
var regex = /([a-f0-9]+)\s+([^\s].*)/;
for(var i = 0; i < allocationEvents.length; i++) {
var allocEvent = allocationEvents[i];
var match = regex.exec(dppResults[i].trim());
allocEvent.symbol = (match ? match[2] : "");
if(allocEvent.symbol != "????????") {
// 00701820 67c66638 6838e622 MSHTML!CSecurityContext::QueryInterface
var pointerMatch = regex.exec(allocEvent.symbol);
if(pointerMatch) {
allocEvent.firstPtr = parseInt(pointerMatch[1], 16);
toFetchSymbols.push(allocEvent.firstPtr);
toFetchSymbolsEvents.push(allocEvent);
}
}
}
var symbolResults = getSymbols(toFetchSymbols);
for(var i = 0; i < toFetchSymbols.length; i++) {
var allocEvent = toFetchSymbolsEvents[i];
var symbolResult = symbolResults[allocEvent.firstPtr];
if(symbolResult != "") {
allocEvent.symbol = symbolResult;
}
}
}
/*
Stop tracking heap allocs/frees. Returns an object of the form:
```
{
timeline: [...],
unAllocatedFrees: {...},
unFreedAllocs: {...}
}
```
* `timeline` is an array of heap events, in the order they occurred.
* `unAllocatedFrees` is an object with keys being addresses that have been freed but were not allocated after `startHeapTracking()` was called. The values are heap events.
* `unFreedAllocs` is an object with keys being addresses that have been allocated and were not freed since `startHeapTracking()` was called. The values are heap events.
A heap event is of the form:
```
{
type: FREE or ALLOC,
addr: address,
(size: allocation size)?,
(heap: heap allocation belongs to)?,
(firstPtr: value of poi(addr))?
}
```
*/
function stopHeapTracking() {
clearBreakpoint(heapAllocBpId);
clearBreakpoint(heapFreeBpId);
var output = _doCommand([".logclose"], true, undefined, undefined, true);
var timeline = [];
var unAllocatedFrees = {};
var unFreedAllocs = {};
_processHeapEvents(output, timeline, unAllocatedFrees, unFreedAllocs);
_resolveFreeEventSymbols(timeline);
_resolveAllocEventSymbols(unFreedAllocs);
return {
timeline: timeline,
unAllocatedFrees: unAllocatedFrees,
unFreedAllocs: unFreedAllocs
};
}
var arrayObjectInstanceVftablePtr = null;
/*
Return a pointer to the given object. If `isOnlyName` is true, the obj is assumed to be a string
and will be evaluated in the window that `setMainWindow` was set to.
*/
function getObjectPtr(obj, isOnlyObjName) {
res = _doCommand(['? @$t0'], true, obj, isOnlyObjName);
var ptrVal = _getEvalExprInt(res);
if(bInfo.name == "MSIE") {
var wrapperType = {
"default": {
symbol: "jscript9!Projection::ArrayObjectInstance::`vftable'",
offset: 0x18
},
"9_x86": {
symbol: "jscript9!Js::CustomExternalObject::`vftable'",
offset: 0x14
},
"8_x86": {
symbol: "mshtml!s_apfnTrackerTearoffVtable",
offset: 0xc
}
}
var symbolInfo = wrapperType[getBrowserVersion()];
if(symbolInfo == undefined) {
symbolInfo = wrapperType["default"];
}
if(!arrayObjectInstanceVftablePtr) {
arrayObjectInstanceVftablePtr = evalExpr(symbolInfo.symbol);
}
var firstPoi = poi(ptrVal);
if(poi(ptrVal) == arrayObjectInstanceVftablePtr) {
// might be different for different browser versions
ptrVal = poi(ptrVal + symbolInfo.offset);
}
} else if(bInfo.name == "Firefox") {
var firstPtrs = dpp(ptrVal, 5, true);
if(firstPtrs[1].symbol.toLowerCase().indexOf("class") != -1 &&
firstPtrs[4].symbol.indexOf("vftable") != -1) {
ptrVal = firstPtrs[4].val;
}
}
return ptrVal;
};
/*
Return the size of the memory allocation referenced by ptr. An
object is returned with at least the two members:
`{base: <addr>, size: <size>}`
More members might be added to the object, depending on which allocator
is used.
If the memory allocation size/base could not be determined, null
is returned.
*/
function getObjectSize(ptr) {
if(bInfo.name == "MSIE") {
return _getObjectSizeMSIE(ptr);
} else if(bInfo.name == "Firefox" ) {
// TODO: create jemalloc windbg script!
return null;
}
return null;
}
function _getObjectSizeMSIE(ptr, numTries) {
if(numTries == undefined) { numTries = 0; }
var output = evalRaw("!heap -p -a " + toWAddr(ptr));
/*
I encounter this on x64 windbg when trying to use !heap -p -a:
*************************************************************************
*** ***
*** ***
*** Your debugger is not using the correct symbols ***
*** ***
*** In order for this command to work properly, your symbol path ***
*** must point to .pdb files that have full type information. ***
*** ***
*** Certain .pdb files (such as the public OS symbols) do not ***
*** contain the required information. Contact the group that ***
*** provided you with these symbols if you need this command to ***
*** work. ***
*** ***
*** Type referenced: wow64!_TEB32 ***
*** ***
*************************************************************************
I am not aware of any ways to resolve this besides using x86 windbg
instead of x64
*/
if(output.indexOf("Your debugger is not using the correct symbols") != -1) {
if(!SHOWED_SYMBOL_ERROR) {
if(numTries == 0) {
var regex = /.*Type referenced:\s*([^\s]+)\s*\*\*\*/;
var match = regex.exec(output);
var missingSymbol = match[1];
if(missingSymbol == "ntdll!_PEB") {
run(".reload /f ntdll.dll", "g");
return _getObjectSizeMSIE(ptr, numTries+1);
}
} else {
alert([
"Somehow some symbols are missing for !heap -p -a <addr> to work!",
"This might not be fixable",
"Missing symbol: " + missingSymbol,
"For allocation size snapping to work, use x86 windbg"
].join("\n\n"));
SHOWED_SYMBOL_ERROR = true;
}
}
return null;
}
var lines = output.split("\n");
if(lines.length < 3) {
return null;
}
/*
eg:
0:006> !heap -p -a 0n3376352
address 003384e0 found in
_HEAP @ 280000
HEAP_ENTRY Size Prev Flags UserPtr UserSize - state
003384d8 0008 0000 [00] 003384e0 00034 - (busy)
MSHTML!CDivElement::`vftable'
*/
var regex = /^\s*_HEAP @ ([0-9a-f]+).*/
var match = regex.exec(lines[1]);
var heap = parseInt(match[1], 16);
// heap entry size prev flags user ptr user size
var regex = /^\s*([0-9a-f]+)\s*([0-9a-f]+)\s*([0-9a-f]+)\s*(\[..\])\s*([0-9a-f]+)\s*([0-9a-f]+).*/
var match = regex.exec(lines[3]);
var heapEntry = parseInt(match[1], 16);
var heapSize = parseInt(match[2], 16);
var userPtr = parseInt(match[5], 16);
var userSize = parseInt(match[6], 16);
res = {
base: userPtr,
size: userSize,
heap: heap,
heapEntry: heapEntry,
heapSize: heapSize
}
return res;
}
/*
-----------------------------------------------------------
SYMBOL RESOLUTION FUNCTIONS
-----------------------------------------------------------
*/
function _symbolHelper(addr, output) {
output = output.trim();
var lines = output.split("\n");
/*
0:008> ln 761c2c51
(761c2c51) kernel32!WinExec | (761c2d67) kernel32!FatalExit
Exact matches:
kernel32!WinExec = <no type information
*/
if(lines.length > 1) {
var line = lines[0];
var matches = line.split("|");
var regex = /^\s*\(([0-9a-f]+)\)\s*([^\s].*)/
for(var i = 0; i < matches.length; i++) {
var part = matches[i];
var match = regex.exec(part);
if(!match) { continue; }
var partAddr = parseInt(match[1], 16);
var symbol = match[2].trim();
if(partAddr == addr) {
return symbol;