-
Notifications
You must be signed in to change notification settings - Fork 16
/
Copy pathemulator.py
746 lines (633 loc) · 35.2 KB
/
emulator.py
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
import logging
import queue
from typing import Any
from typing import List
from typing import Tuple
from typing import Union
from capstone import Cs
from elftools.elf.elffile import ELFFile
from qiling import *
from qiling.const import *
from qiling.os.utils import UcError
from analyzer import DeflatAnalyzer
from arch_util import arm64_util
from arch_util import general_arch_util
from patcher import Patcher
from util.block import Block
from util.block import BlockContainer
# Powered by HAPPY
class DeflatEmu:
block_container: BlockContainer
deflat_analyzer: DeflatAnalyzer
real_blocks: List[int] # i.e. relevant_nodes in deflat analyzer
return_blocks: List[int]
prologue_node_id: int
main_dispatcher_node_id: int
emu: 'Emulator'
filename: str
md: Cs # capstone
base_addr: int
logger: logging
highest_address_boundary: int
verbose_hook = False
cached_last_instruction_address: int # to fix the bug of unicorn hook
arch_type: Union[Tuple[None, None], Any]
# only for way1
# cached_instructions_history: Dict[int, int]
cached_instructions_history: List[int]
# cached_predecessor_table = {}
def _fill_node_code(self, node, ql: Qiling):
# ensure the code length is correct
if node.cfg_nodes[0].bytestr is not None and len(node.cfg_nodes[0].bytestr) == node.size:
return
node.cfg_nodes[0].bytestr = ql.mem.read(node.addr + self.base_addr, node.size)
def __init__(self, deflat_analyzer, rootfs):
self.dfs_start_address = 0
self.dfs_paths = {}
self.dfs_branch_force = False
self.dfs_next_addr = -1
self.dfs_success = False
self.cached_instructions_history = []
self.block_container = BlockContainer()
self.deflat_analyzer = deflat_analyzer
self.filename = self.deflat_analyzer.filename
assert self.deflat_analyzer.prologue_node is not None
self.highest_address_boundary = deflat_analyzer.highest_address_boundary
self.real_blocks = []
self.return_blocks = []
self.rootfs = rootfs
self.emu = Emulator(self.filename, self.rootfs)
self.base_addr = self.emu.base_addr
for real_block in self.deflat_analyzer.relevant_nodes:
self._fill_node_code(real_block, self.emu.ql)
self.real_blocks.append(self.block_container.add_cfg_node_to_block(real_block, self.base_addr))
for return_block in self.deflat_analyzer.return_nodes:
self._fill_node_code(return_block, self.emu.ql)
self.return_blocks.append(self.block_container.add_cfg_node_to_block(return_block, self.base_addr))
self._fill_node_code(deflat_analyzer.prologue_node, self.emu.ql)
self._fill_node_code(deflat_analyzer.main_dispatcher_node, self.emu.ql)
self.prologue_node_id = self.block_container.add_cfg_node_to_block(deflat_analyzer.prologue_node,
self.base_addr)
self.main_dispatcher_node_id = self.block_container.add_cfg_node_to_block(deflat_analyzer.main_dispatcher_node,
self.base_addr)
# trivial stuff
self.logger = logging.getLogger(__name__)
self.logger.setLevel(logging.DEBUG)
self.arch_type = self.emu.ql.archtype
def _disasm(self, ql: Qiling, address, size):
if self.md is None:
self.md = general_arch_util.create_disassembler(ql)
return next(self.md.disasm(ql.mem.read(address, size), address))
def _get_reg_operand(self, instruction, index: int):
# reg_info = op_str.split(',')
# return reg_info[index].strip()
return self._get_reg_operands(instruction)[index]
def _get_reg_operands(self, instruction):
# reg_info = [reg.strip() for reg in op_str.split(',')]
# return reg_info
reg_list = []
for i in instruction.operands:
if i.type == general_arch_util.get_op_reg_const(self.emu.ql.archtype):
reg_list.append(instruction.reg_name(i.value.reg))
return reg_list
def clear_cache(self):
self.cached_last_instruction_address = -1
def guide_hook(self, ql: Qiling, addr, size):
if addr == self.cached_last_instruction_address:
return
else:
self.cached_last_instruction_address = addr
# self.logger.info(
# f"Executing: {hex(addr - self.base_addr)}, relevant : {self.block_container.get_block_id_from_address(addr) in [*self.return_blocks, *self.real_blocks]}")
# self.logger.info(f"Executing: {hex(addr - self.base_addr)}")
start_block_id = self.hook_data['start_block']
# cur_bb = IDA.get_block(addr)
current_block_id = self.block_container.get_block_id_from_address(addr)
if addr in self.cached_instructions_history:
# self.logger.debug(
# f"potential fake block {hex(self.block_container.get_block_from_id(current_block_id).start_addr - self.base_addr)} at {hex(addr - self.base_addr)}, skip it.")
ql.emu_stop()
self.cached_instructions_history.append(addr)
instruction = self._disasm(ql, addr, size)
should_skip = False
if "force" in self.hook_data and addr in self.hook_data['force']:
if self.hook_data['force'][addr]:
self.logger.debug(f"force true on {hex(addr - self.base_addr)}")
if ql.archtype == QL_ARCH.X8664 or ql.archtype == QL_ARCH.X86:
# cmov
reg1 = self._get_reg_operand(instruction, 0)
reg2 = self._get_reg_operand(instruction, 1)
reg2_val = ql.reg.__getattribute__(reg2)
assert reg2_val is not None
ql.reg.__setattr__(reg1, reg2_val)
elif ql.archtype == QL_ARCH.ARM64:
# csel A B C
# A <- B
reg1 = self._get_reg_operand(instruction, 0)
reg2 = self._get_reg_operand(instruction, 1)
reg2_val = ql.reg.__getattribute__(reg2)
assert reg2_val is not None
ql.reg.__setattr__(reg1, reg2_val)
else:
raise Exception("haven't impl yet.")
else:
self.logger.debug(f"force false on {hex(addr - self.base_addr)}")
if ql.archtype == QL_ARCH.ARM64:
# csel A B C
# A <- C
reg1 = self._get_reg_operand(instruction, 0)
reg2 = self._get_reg_operand(instruction, 2)
reg2_val = ql.reg.__getattribute__(reg2)
assert reg2_val is not None
ql.reg.__setattr__(reg1, reg2_val)
# pass for x86
should_skip = True
if self.verbose_hook:
self.logger.debug("> 0x%x:\t%s\t%s" % (instruction.address, instruction.mnemonic, instruction.op_str))
self.logger.debug("instruction size %d" % (size))
if ql.archtype != QL_ARCH.ARM64:
raise Exception("todo")
# if instruction.op_str.find('sp') == -1:
# self.logger.debug(
# "> skip 0x%x:\t%s\t%s" % (instruction.address, instruction.mnemonic, instruction.op_str))
# should_skip = True
if instruction.op_str.find('[') != -1:
if instruction.op_str.find('[sp') == -1:
self.logger.debug(
"> skip 0x%x:\t%s\t%s" % (instruction.address, instruction.mnemonic, instruction.op_str))
should_skip = True
# skip caller
if instruction.id in general_arch_util.get_call_types(ql.archtype):
self.logger.debug("skip call instruction")
should_skip = True
if instruction.id in general_arch_util.get_function_ret_types(ql.archtype):
ql.emu_stop()
if should_skip:
if self.verbose_hook:
self.logger.debug(f"PC is {hex(ql.reg.arch_pc)}")
self.logger.debug(f"addr is {hex(addr)}")
ql.reg.arch_pc += size
if self.verbose_hook:
self.logger.debug(f"PC guided to {hex(ql.reg.arch_pc)}")
if start_block_id == current_block_id:
return
if current_block_id in self.real_blocks or current_block_id in self.return_blocks:
if current_block_id not in self.paths[start_block_id]:
assert start_block_id != current_block_id
self.logger.debug(f"new path to {hex(addr - self.base_addr)}, i.e. {start_block_id} -> {current_block_id}")
self.paths[start_block_id].append(current_block_id)
# self.cached_predecessor_table[current_block_id].append(start_block_id)
ql.emu_stop()
def _skip_unmapped_rw(self, ql, type, addr, size, value):
map_addr = ql.mem.align(addr)
map_size = ql.mem.align(size)
if not ql.mem.is_mapped(map_addr, map_size):
self.logger.warning(f"Invalid memory R/W, trying to map {hex(map_size)} at {hex(map_addr)}")
ql.mem.map(map_addr, map_size)
ql.mem.write(map_addr, b'\x00' * map_size)
return True
def _is_branch_type_instruction(self, address, size):
if self.emu.ql.archtype == QL_ARCH.ARM64:
target_branch_types = arm64_util.get_branch_instruction_types()
else:
raise Exception("Haven't impl yet.")
instruction = self._disasm(self.emu.ql, address, size)
print(instruction.op_str)
if instruction.op_str.find("csel") != -1:
self.logger.error("FATAL FOUND!!")
if instruction.id in target_branch_types:
self.logger.debug(f"find branch at {hex(instruction.address - self.base_addr)}")
return True
else:
return False
def _find_branch_in_real_block(self, block: Block):
instruction_list = self.md.disasm(block.code, block.start_addr)
# only support arm64 currently
if self.emu.ql.archtype == QL_ARCH.ARM64:
target_branch_types = arm64_util.get_branch_instruction_types()
else:
raise Exception("Haven't impl yet.")
for instruction in instruction_list:
# if block.start_addr == 0x13E2C + self.base_addr:
# self.logger.debug("0x%x:\t%s\t%s,%d" % (
# instruction.address, instruction.mnemonic, instruction.op_str, instruction.id))
if instruction.id in target_branch_types:
self.logger.debug(f"find branch at {hex(instruction.address - self.base_addr)}")
return instruction.address
return None
def _block_str(self, block_id):
block = self.block_container.get_block_from_id(block_id)
# return f"block addr: {hex(block.start_addr - self.base_addr)}, end_address :{hex(block.start_addr + block.size - self.base_addr)}"
return f"block addr: {hex(block.start_addr - self.base_addr)} "
# if type(block_id) is int:
# block_id = self.bb_mapping[block_id]
# return f"Block id: {block_id.id}, start_address: {block_id.start_ea:x}, end_address: {block_id.end_ea:x}, type: {block_id.type}"
def _log_paths_str(self):
self.logger.info("-" * 30 + 'path info' + "-" * 30)
for block_id, successors in self.paths.items():
if len(successors) == 1:
self.logger.info(f"{self._block_str(block_id)} -> {self._block_str(successors[0])}")
elif len(successors) == 2:
self.logger.info(f"{self._block_str(block_id)} --(force jump)--> {self._block_str(successors[0])}")
self.logger.info(f"|----(skip jump)----> {self._block_str(successors[1])}")
else:
self.logger.info(f"{self._block_str(block_id)} as return block")
def _log_dfs_paths_str(self):
for address, successors in self.dfs_paths.items():
if len(successors) == 1:
self.logger.info(f"{hex(address)} -> {hex(successors[0])}")
elif len(successors) == 2:
self.logger.info(f"{hex(address)} --(force jump)--> {hex(successors[0])}")
self.logger.info(f"|----(skip jump)----> {hex(successors[1])}")
else:
assert len(successors) == 0
self.logger.info(f"{hex(address)} as return block")
def recursive_guild_hook(self, ql: Qiling, addr, size):
if self.dfs_success:
# success in dfs, so stop here
ql.emu_stop()
if addr == self.cached_last_instruction_address:
return
else:
self.cached_last_instruction_address = addr
# PC out of bound case
if addr - self.base_addr >= self.highest_address_boundary:
ql.emu_stop()
return
self.logger.info(f"Executing: {hex(addr - self.base_addr)}")
if self.block_container.get_block_id_from_address(addr) in self.real_blocks:
if addr in self.cached_instructions_history:
if self.verbose_hook:
self.logger.debug(
f"potential fake block {hex(self.block_container.get_block_address_from_address(addr) - self.base_addr)} at {hex(addr - self.base_addr)}, skip it.")
ql.emu_stop()
self.cached_instructions_history.append(addr)
current_block_id = self.block_container.get_block_id_from_address(addr)
start_block_id = self.block_container.get_block_id_from_address(self.dfs_start_address)
if current_block_id in [*self.real_blocks, *self.return_blocks] and \
start_block_id != current_block_id and \
addr == self.block_container.get_block_address_from_address(addr):
# and addr != self.block_container.get_block_address_from_address( addr):
self.logger.debug(f"path dfs success at {hex(addr - self.base_addr)}")
self.dfs_success = True
self.dfs_next_addr = addr
ql.emu_stop()
instruction = self._disasm(ql, addr, size)
should_skip = False
if ql.archtype != QL_ARCH.ARM64:
raise Exception("todo")
if instruction.op_str.find('[') != -1:
if instruction.op_str.find('[sp') == -1:
self.logger.debug(
"> skip 0x%x:\t%s\t%s" % (instruction.address, instruction.mnemonic, instruction.op_str))
should_skip = True
# skip caller
if instruction.id in general_arch_util.get_call_types(ql.archtype):
self.logger.debug("skip call instruction")
should_skip = True
# stop at ret
if instruction.id in general_arch_util.get_function_ret_types(ql.archtype):
self.logger.debug("dfs_success for ret")
self.dfs_success = False
ql.emu_stop()
if instruction.id in arm64_util.get_branch_instruction_types():
assert ql.archtype == QL_ARCH.ARM64
if not self.dfs_branch_force:
# csel A B C cond
# A <- B
reg1 = self._get_reg_operand(instruction, 0)
reg2 = self._get_reg_operand(instruction, 1)
reg2_val = ql.reg.__getattribute__(reg2)
assert reg2_val is not None
ql.reg.__setattr__(reg1, reg2_val)
if self.verbose_hook:
self.logger.debug(f"force false on {hex(addr - self.base_addr)}")
else:
# csel A B C cond
# A <- C
reg1 = self._get_reg_operand(instruction, 0)
reg2 = self._get_reg_operand(instruction, 2)
reg2_val = ql.reg.__getattribute__(reg2)
assert reg2_val is not None
ql.reg.__setattr__(reg1, reg2_val)
# ql.reg.arch_pc += size
should_skip = True
if should_skip:
if self.verbose_hook:
self.logger.debug(f"PC is {hex(ql.reg.arch_pc)}")
self.logger.debug(f"addr is {hex(addr)}")
ql.reg.arch_pc += size
if self.verbose_hook:
self.logger.debug(f"PC guided to {hex(ql.reg.arch_pc)}")
def dfs(self, address, branch=None):
self.cached_instructions_history = []
self.dfs_success = False
self.dfs_next_addr = -1 # based
self.dfs_branch_force = branch
try:
self.emu.run(address)
self.dfs_start_address = address
except UcError as e:
pass
if self.dfs_success:
return self.dfs_next_addr
else:
return None
def _add_to_dfs_paths(self, from_path, to_path):
if from_path in self.dfs_paths.keys():
self.dfs_paths[from_path].append(to_path)
else:
self.dfs_paths[from_path] = [to_path]
def _convert_dfs_paths_to_paths(self):
self.logger.debug("convert_dfs_paths_to_paths. This will clear the origin paths.")
self.paths = {}
for address, successors in self.dfs_paths.items():
assert len(successors) <= 2
address_id = self.block_container.get_block_id_from_address(address + self.base_addr)
assert address_id != -1
# self.logger.debug(f"{hex(address)} with {address_id}")
# for s in successors:
# if self.block_container.get_block_id_from_address(s + self.base_addr) == None:
# self.logger.error(f"[CONVERTING WARNING] fail to find block at {hex(s)}")
self.paths[address_id] = [self.block_container.get_block_id_from_address(s + self.base_addr) for s in successors]
def search_path(self, strategy=0):
reals = [self.prologue_node_id, *self.real_blocks, *self.return_blocks]
self.paths = {block_id: [] for block_id in reals}
self.dfs_paths = {}
# self.cached_predecessor_table = {block_id: [] for block_id in reals}
# self.emu.start()
ql = self.emu.ql
self.md = general_arch_util.create_disassembler(ql)
self.md.detail = True
self.hook_data = None
ql.hook_mem_read_invalid(self._skip_unmapped_rw)
ql.hook_mem_write_invalid(self._skip_unmapped_rw)
ql.hook_mem_unmapped(self._skip_unmapped_rw)
ql.hook_mem_fetch_invalid(self._skip_unmapped_rw)
context_dict = {}
self.clear_cache()
# way 1 : traverse
if strategy == 0:
ql.hook_code(self.guide_hook)
# cached_traversed_table = []
for block_id in reals:
bb = self.block_container.get_block_from_id(block_id)
self.logger.debug(f"searching blocks in {hex(bb.start_addr - self.base_addr)}")
branch_addr = self._find_branch_in_real_block(bb)
self.hook_data = {
"start_block": block_id
}
self.logger.debug(f"working on {hex(bb.start_addr - self.emu.base_addr)}")
self.clear_cache()
if branch_addr is None:
# self.verbose_hook = True
self.cached_instructions_history = []
self.logger.debug("non branch block")
ql.run(begin=bb.start_addr)
else:
# if (bb.start_addr - self.emu.base_addr) == 0x13E2C:
# # or (bb.start_addr - self.emu.base_addr) == 0x13e90:
# self.verbose_hook = True
self.logger.debug("branch block")
self.hook_data['force'] = {branch_addr: True}
self.cached_instructions_history = []
ql.run(begin=bb.start_addr)
self.hook_data['force'] = {branch_addr: False}
self.cached_instructions_history = []
ql.run(begin=bb.start_addr)
# if bb.start_addr - self.emu.base_addr == 0x13E2C:
self.verbose_hook = False
self._log_paths_str()
elif strategy == 1:
# way 2 : dfs
ql.hook_code(self.recursive_guild_hook)
block_queue: queue.LifoQueue = queue.LifoQueue()
prologue_addr = self.block_container.get_block_from_id(self.prologue_node_id).start_addr
block_queue.put((prologue_addr, None))
cached_address_lists = []
while not block_queue.empty():
block_environment = block_queue.get()
current_address = block_environment[0]
context = block_environment[1]
self.emu.restore_context(context)
if current_address - self.base_addr in self.dfs_paths.keys():
self.logger.debug(f"skip the same dfs path {hex(current_address - self.base_addr)}")
continue
# cached_address_lists.append(current_address)
# is_branch_ins = self._is_branch_type_instruction(current_address, 4)
is_branch_ins = self._find_branch_in_real_block(self.block_container.get_block_from_id(
self.block_container.get_block_id_from_address(current_address)))
if is_branch_ins:
self.logger.debug(f"has branch at {hex(current_address - self.base_addr)}")
current_context = self.emu.save_context()
path_true = self.dfs(address=current_address, branch=False)
if path_true is not None:
self.logger.debug(
f"find path 1 from {hex(current_address - self.base_addr)} -> {hex(path_true - self.base_addr)}")
# self.dfs_paths[self.block_container.get_block_id_from_address(current_address)] \
# .append(self.block_container.get_block_id_from_address(path_true - self.base_addr))
self._add_to_dfs_paths(current_address - self.base_addr, path_true - self.base_addr)
block_queue.put((path_true, self.emu.save_context()))
self.emu.restore_context(current_context)
path_false = self.dfs(address=current_address, branch=True)
if path_false != path_true:
self.logger.debug(
f"find path 2 from {hex(current_address - self.base_addr)} -> {hex(path_false - self.base_addr)}")
self._add_to_dfs_paths(current_address - self.base_addr, path_false - self.base_addr)
# self.dfs_paths[self.block_container.get_block_id_from_address(current_address)].append(
# self.block_container.get_block_id_from_address(path_false - self.base_addr))
block_queue.put((path_false, self.emu.save_context()))
else:
path = self.dfs(address=current_address)
if path is not None:
block_queue.put((path, self.emu.save_context()))
assert isinstance(path, int)
self.logger.debug(
f"find path from {hex(current_address - self.base_addr)} -> {hex(path - self.base_addr)}")
# self.dfs_paths[self.block_container.get_block_id_from_address(current_address)].append(
# self.block_container.get_block_id_from_address(path - self.base_addr))
self._add_to_dfs_paths(current_address - self.base_addr, path - self.base_addr)
# self._log_dfs_paths_str()
self._convert_dfs_paths_to_paths()
self._log_paths_str()
del self.emu
self.emu = None
def patch_code(self, enable_trampoline=False):
patcher = Patcher(self.filename)
assert len(self.paths.items()) > 1
self.logger.info("-" * 30 + 'begin patch' + "-" * 30)
# nop irrelevant nodes
for node in self.deflat_analyzer.irrelevant_nodes:
if self.arch_type == QL_ARCH.ARM64:
start_addr = node.addr # irrelevant nodes keeps its zero base
self.logger.debug(f"nop at {hex(start_addr)}, size {node.size}")
assert node.size % 4 == 0
nop_count = int(node.size / 4)
instruction_value = arm64_util.assemble_nop_instruction() * nop_count
patcher.patch(start_addr, node.size, instruction_value)
else:
raise Exception("Unsupported Arch")
max_trampoline_pool_cnt = 2 * len(self.paths.keys())
trampoline_pool: List[int] = [] # only for arm64.
used_trampoline_pool: List[int] = [] # block addr, target_addr
if enable_trampoline:
if self.arch_type == QL_ARCH.ARM64:
for node in self.deflat_analyzer.irrelevant_nodes:
if node.size >= 4:
for cur_addr_offset in range(0, node.size, 4):
trampoline_pool.append(node.addr + cur_addr_offset)
if len(trampoline_pool) >= max_trampoline_pool_cnt:
break
if len(trampoline_pool) >= max_trampoline_pool_cnt:
break
trampoline_pool.append(*self.deflat_analyzer.manual_trampoline_addr_list)
# handle control flow
for block_id, successors in self.paths.items():
block = self.block_container.get_block_from_id(block_id)
start_addr = block.start_addr - self.base_addr
self.logger.debug(f"patch working on {hex(start_addr)}, {successors}")
instructions = [ins for ins in self.md.disasm(block.code, start_addr)]
if self.arch_type == QL_ARCH.ARM64:
# ARM64 patch
if len(successors) == 2:
# real branch
true_branch = self.block_container.get_block_from_id(successors[0]).start_addr - self.base_addr
false_branch = self.block_container.get_block_from_id(successors[1]).start_addr - self.base_addr
self.logger.debug(f"true {hex(true_branch)}, false {hex(false_branch)}")
should_trampoline = False
current_trampoline_addr = -1
if true_branch < start_addr and enable_trampoline:
should_trampoline = True
for i in range(len(trampoline_pool)):
if trampoline_pool[i] > start_addr:
current_trampoline_addr = trampoline_pool[i]
trampoline_pool.pop(i)
break
if current_trampoline_addr == -1:
self.logger.error(
f"Fail to find the suitable trampoline at {hex(start_addr)} with branch {hex(true_branch)}")
should_trampoline = False
if instructions[-2].id in arm64_util.get_branch_instruction_types():
self.logger.debug(f"at -2")
instruction_address = instructions[-2].address
if should_trampoline:
self.logger.debug(f"trampoline to {hex(current_trampoline_addr)}")
assert current_trampoline_addr != -1
patched_code = arm64_util.assemble_branch_instruction(
instruction_address, current_trampoline_addr - instruction_address, false_branch,
instructions[-2].op_str.split(',')[-1].strip())
assert len(patched_code) == 8
# patch in trampoline
used_trampoline_pool.append(current_trampoline_addr)
b_instruction = arm64_util.assemble_no_branch_instruction(current_trampoline_addr,
true_branch)
patcher.patch(current_trampoline_addr, 4, b_instruction)
else:
# recalculate the offset due to the keystone bug, maybe.
patched_code = arm64_util.assemble_branch_instruction(
instruction_address, true_branch - instruction_address, false_branch,
instructions[-2].op_str.split(',')[-1].strip())
assert len(patched_code) == 8
patcher.patch(instruction_address, 8, patched_code)
elif instructions[-3].id in arm64_util.get_branch_instruction_types():
self.logger.debug(f"at -3")
instruction_address = instructions[-3].address
branch_offset = instruction_address + 4
if should_trampoline:
self.logger.debug(f"trampoline to {hex(current_trampoline_addr)}")
assert current_trampoline_addr != -1
patched_code = arm64_util.assemble_branch_instruction(
branch_offset, current_trampoline_addr - branch_offset, false_branch,
instructions[-3].op_str.split(',')[-1].strip())
assert len(patched_code) == 8
# patch in trampoline
used_trampoline_pool.append(current_trampoline_addr)
b_instruction = arm64_util.assemble_no_branch_instruction(current_trampoline_addr, true_branch)
patcher.patch(current_trampoline_addr, 4, b_instruction)
else:
patched_code = arm64_util.assemble_branch_instruction(
branch_offset, true_branch - branch_offset, false_branch,
instructions[-3].op_str.split(',')[-1].strip())
assert len(patched_code) == 8
patcher.copy_to_patch(instruction_address, branch_offset, 4)
patcher.patch(branch_offset, 8, patched_code)
else:
assert len(instructions) > 4
self.logger.warning("may encounter special csel instruction with larger than 2 offset, this is an experimental patch.")
target_branch_instruction = None
# instructions[-3].id in arm64_util.get_branch_instruction_types()
for cursor_offset in range(len(instructions) - 1, -1, -1):
if instructions[cursor_offset].id in arm64_util.get_branch_instruction_types():
target_branch_instruction = instructions[cursor_offset]
break
if target_branch_instruction is None:
raise Exception("Unhandled Branch Block")
target_branch_instruction_address = target_branch_instruction.address
self.logger.debug(f"target_branch_instruction at {hex(target_branch_instruction_address)}, {target_branch_instruction.op_str}")
# Disable trampoline here!
branch_offset = start_addr + block.size - 8 # instructions[-2].addresss # we assume the last two instructions to be branch
self.logger.debug(f"last two instruction at {hex(branch_offset)}")
assert isinstance(branch_offset, int)
patched_code = arm64_util.assemble_branch_instruction(
branch_offset, true_branch - branch_offset, false_branch,
target_branch_instruction.op_str.split(',')[-1].strip())
assert len(patched_code) == 8
cnt = branch_offset - target_branch_instruction_address
patcher.copy_to_patch(target_branch_instruction_address, target_branch_instruction_address + 4, cnt)
patcher.patch(branch_offset, 8, patched_code)
elif len(successors) == 1:
# force jump
instruction_address = instructions[-1].address
next_block = self.block_container.get_block_from_id(successors[0]).start_addr - self.base_addr
self.logger.debug(f"next_block {hex(next_block)}")
patched_code = arm64_util.assemble_no_branch_instruction(instruction_address, next_block)
patcher.patch(instruction_address, 4, patched_code)
else:
assert len(successors) == 0
# return block
continue
else:
raise Exception("Unsupported Arch")
patcher.write_patch_to_file()
self.logger.info("Patch code finish.")
class Emulator:
ql: Qiling
base_addr: int
def __init__(self, filename, rootfs):
self.path = filename
self.rootfs = rootfs
# rootfs=self.rootfs
self.ql = Qiling(filename=[self.path], rootfs=self.rootfs, ) # output="debug", verbose=1
self.status = None
self.exit_addr = None
if self.ql.ostype == QL_OS.LINUX:
f = open(self.ql.path, 'rb')
elf_file = ELFFile(f)
elf_header = elf_file.header
if elf_header['e_type'] == 'ET_EXEC':
self.base_addr = self.ql.os.elf_mem_start
elif elf_header['e_type'] == 'ET_DYN':
if self.ql.archbit == 32:
self.base_addr = int(self.ql.os.profile.get("OS32", "load_address"), 16)
elif self.ql.archbit == 64:
self.base_addr = int(self.ql.os.profile.get("OS64", "load_address"), 16)
else:
self.base_addr = 0x0
def run(self, begin=None, end=None):
self.ql.run(begin, end)
def save_context(self):
context = self.ql.save(mem=True, reg=True, fd=False, cpu_context=True)
return context
def restore_context(self, context):
if context is not None:
self.ql.restore(context)
def remove_ql(self):
if self.ql is not None:
del self.ql
self.ql = None
class BinaryTest():
def test_binary(self):
ql = Qiling(["example/lib64_example.so"], "rootfs/arm64_android", output="debug")
print(ql.os.elf_mem_start)
base = int(ql.os.profile.get("OS64", "load_address"), 16)
ql.run(begin=0x13C88 + base, end=0x13CA0 + base)