forked from keystone-engine/keypatch
-
Notifications
You must be signed in to change notification settings - Fork 0
/
keypatch.py
1760 lines (1460 loc) · 66.3 KB
/
keypatch.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
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
# -*- coding: utf-8 -*-
# Keypatch IDA Plugin, powered by Keystone Engine (http://www.keystone-engine.org).
# By Nguyen Anh Quynh & Thanh Nguyen, 2016.
# Keypatch is released under the GPL v2. See COPYING for more information.
# Find docs & latest version at http://keystone-engine.org/keypatch
# This IDA plugin includes 3 tools inside: Patcher, Fill Range & Search.
# Access to these tools via menu "Edit | Keypatch", or via right-click popup menu "Keypatch".
# Hotkey Ctrl-Alt-K opens either Patcher or "Fill Range" window, depending on context.
# - If there is no code selection, hotkey opens Patcher dialog
# - If a range of code is selected, hotkey opens "Fill Range" dialog
# To revert (undo) the last patching, choose menu "Edit | Keypatch | Undo last patching".
# To check for update version, choose menu "Edit | Keypatch | Check for update".
import os
import re
import json
from keystone import *
import idc
import idaapi
from idc import GetOpType, GetOpnd, ItemEnd
# bleeding-edge version
# on a new release, this should be sync with VERSION_STABLE file
VERSION = "2.2"
MAX_INSTRUCTION_STRLEN = 64
MAX_ENCODING_LEN = 40
MAX_ADDRESS_LEN = 40
ENCODING_ERR_OUTPUT = "..."
KP_GITHUB_VERSION = "https://raw.githubusercontent.com/keystone-engine/keypatch/master/VERSION_STABLE"
KP_HOMEPAGE = "http://keystone-engine.org/keypatch"
X86_NOP = "\x90"
# Configuration file
KP_CFGFILE = os.path.join(idaapi.get_user_idadir(), "keypatch.cfg")
# save all the info on patching
patch_info = []
def to_hexstr(buf, sep=' '):
return sep.join("{0:02x}".format(ord(c)) for c in buf).upper()
# return a normalized code, or None if input is invalid
def convert_hexstr(code):
# normalize code
code = code.lower()
code = code.replace(' ', '') # remove space
code = code.replace('h', '') # remove trailing 'h' in 90h
code = code.replace('0x', '') # remove 0x
code = code.replace('\\x', '') # remove \x
code = code.replace(',', '') # remove ,
code = code.replace(';', '') # remove ;
code = code.replace('"', '') # remove "
code = code.replace("'", '') # remove '
code = code.replace("+", '') # remove +
# single-digit hexcode?
if len(code) == 1 and ((code >= '0' and code <= '9') or (code >= 'a' and code <= 'f')):
# stick 0 in front (so 'a' --> '0a')
code = '0' + code
# odd-length is invalid
if len(code) % 2 != 0:
return None
try:
hex_data = code.decode('hex')
# we want a list of int
return [ord(i) for i in hex_data]
except:
# invalid hex
return None
# download a file from @url, then return (result, file-content)
# return (0, content) on success, or ({1|2}, None) on download failure
def url_download(url):
from urllib2 import Request, urlopen, URLError, HTTPError
# create the url and the request
req = Request(url)
# Open the url
try:
# download this URL
f = urlopen(req)
content = f.read()
return (0, content)
# handle errors
except HTTPError, e:
# print "HTTP Error:", e.code , url
# fail to download this file
return (1, None)
except URLError, e:
# print "URL Error:", e.reason , url
# fail to download this file
return (1, None)
except Exception as e:
# fail to save the downloaded file
# print("Error:", e)
return (2, None)
## Main Keypatch class
class Keypatch_Asm:
# supported architectures
arch_lists = {
"X86 16-bit": (KS_ARCH_X86, KS_MODE_16), # X86 16-bit
"X86 32-bit": (KS_ARCH_X86, KS_MODE_32), # X86 32-bit
"X86 64-bit": (KS_ARCH_X86, KS_MODE_64), # X86 64-bit
"ARM": (KS_ARCH_ARM, KS_MODE_ARM), # ARM
"ARM Thumb": (KS_ARCH_ARM, KS_MODE_THUMB), # ARM Thumb
"ARM64 (ARMV8)": (KS_ARCH_ARM64, KS_MODE_LITTLE_ENDIAN),# ARM64
"Hexagon": (KS_ARCH_HEXAGON, KS_MODE_BIG_ENDIAN), # Hexagon
"Mips32": (KS_ARCH_MIPS, KS_MODE_MIPS32), # Mips32
"Mips64": (KS_ARCH_MIPS, KS_MODE_MIPS64), # Mips64
"PowerPC 32": (KS_ARCH_PPC, KS_MODE_PPC32), # PPC32
"PowerPC 64": (KS_ARCH_PPC, KS_MODE_PPC64), # PPC64
"Sparc 32": (KS_ARCH_SPARC, KS_MODE_SPARC32), # Sparc32
"Sparc 64": (KS_ARCH_SPARC, KS_MODE_SPARC64), # Sparc64
"SystemZ": (KS_ARCH_SYSTEMZ, KS_MODE_BIG_ENDIAN), # SystemZ
}
endian_lists = {
"Little Endian": KS_MODE_LITTLE_ENDIAN, # little endian
"Big Endian": KS_MODE_BIG_ENDIAN, # big endian
}
syntax_lists = {
"Intel": KS_OPT_SYNTAX_INTEL,
"Nasm": KS_OPT_SYNTAX_NASM,
"AT&T": KS_OPT_SYNTAX_ATT
}
def __init__(self, arch=None, mode=None):
# update current arch and mode
self.update_hardware_mode()
# override arch & mode if provided
if arch is not None:
self.arch = arch
if mode is not None:
self.mode = mode
# IDA uses Intel syntax by default
self.syntax = KS_OPT_SYNTAX_INTEL
# return Keystone arch & mode (with endianess included)
@staticmethod
def get_hardware_mode():
(arch, mode) = (None, None)
# heuristically detect hardware setup
info = idaapi.get_inf_structure()
try:
cpuname = info.procname.lower()
except:
cpuname = info.procName.lower()
try:
# since IDA7 beta 3 (170724) renamed inf.mf -> is_be()/set_be()
is_be = idaapi.cvar.inf.is_be()
except:
# older IDA versions
is_be = idaapi.cvar.inf.mf
# print("Keypatch BIG_ENDIAN = %s" %is_be)
if cpuname == "metapc":
arch = KS_ARCH_X86
if info.is_64bit():
mode = KS_MODE_64
elif info.is_32bit():
mode = KS_MODE_32
else:
mode = KS_MODE_16
elif cpuname.startswith("arm"):
# ARM or ARM64
if info.is_64bit():
arch = KS_ARCH_ARM64
if is_be:
mode = KS_MODE_BIG_ENDIAN
else:
mode = KS_MODE_LITTLE_ENDIAN
else:
arch = KS_ARCH_ARM
# either big-endian or little-endian
if is_be:
mode = KS_MODE_ARM | KS_MODE_BIG_ENDIAN
else:
mode = KS_MODE_ARM | KS_MODE_LITTLE_ENDIAN
elif cpuname.startswith("sparc"):
arch = KS_ARCH_SPARC
if info.is_64bit():
mode = KS_MODE_SPARC64
else:
mode = KS_MODE_SPARC32
if is_be:
mode |= KS_MODE_BIG_ENDIAN
else:
mode |= KS_MODE_LITTLE_ENDIAN
elif cpuname.startswith("ppc"):
arch = KS_ARCH_PPC
if info.is_64bit():
mode = KS_MODE_PPC64
else:
mode = KS_MODE_PPC32
if cpuname == "ppc":
# do not support Little Endian mode for PPC
mode += KS_MODE_BIG_ENDIAN
elif cpuname.startswith("mips"):
arch = KS_ARCH_MIPS
if info.is_64bit():
mode = KS_MODE_MIPS64
else:
mode = KS_MODE_MIPS32
if is_be:
mode |= KS_MODE_BIG_ENDIAN
else:
mode |= KS_MODE_LITTLE_ENDIAN
elif cpuname.startswith("systemz") or cpuname.startswith("s390x"):
arch = KS_ARCH_SYSTEMZ
mode = KS_MODE_BIG_ENDIAN
return (arch, mode)
def update_hardware_mode(self):
(self.arch, self.mode) = self.get_hardware_mode()
# normalize assembly code
# remove comment at the end of assembly code
@staticmethod
def asm_normalize(text):
text = ' '.join(text.split())
if text.rfind(';') != -1:
return text[:text.rfind(';')].strip()
return text.strip()
@staticmethod
# check if input address is valid
# return
# -1 invalid address at target binary
# 0 type mismatch of input address
# 1 valid address at target binary
def check_address(address):
try:
if idaapi.isEnabled(address):
return 1
else:
return -1
except:
# invalid type
return 0
### resolve IDA names from input asm code
# todo: a better syntax parser for all archs
def ida_resolve(self, assembly, address=idc.BADADDR):
def _resolve(_op, ignore_kw=True):
names = re.findall(r"\b[a-z0-9_:\.]+\b", _op, re.I)
# try to resolve all names
for name in names:
# ignore known keywords
if ignore_kw and name in ('byte', 'near', 'short', 'word', 'dword', 'ptr', 'offset'):
continue
sym = name
# split segment reg
parts = name.partition(':')
if parts[2] != '':
sym = parts[2]
(t, v) = idaapi.get_name_value(address, sym)
# skip if name doesn't exist or segment / segment registers
if t in (idaapi.NT_SEG, idaapi.NT_NONE):
continue
_op = _op.replace(sym, '0x{0:X}'.format(v))
return _op
if self.check_address(address) == 0:
print("Keypatch: WARNING: invalid input address {0}".format(address))
return assembly
# for now, we only support IDA name resolve for X86, ARM, ARM64, MIPS, PPC, SPARC
if not (self.arch in (KS_ARCH_X86, KS_ARCH_ARM, KS_ARCH_ARM64, KS_ARCH_MIPS, KS_ARCH_PPC, KS_ARCH_SPARC)):
return assembly
_asm = assembly.partition(' ')
mnem = _asm[0]
opers = _asm[2].split(',')
for idx, op in enumerate(opers):
_op = list(op.partition('['))
ignore_kw = True
if _op[1] == '':
_op[2] = _op[0]
_op[0] = ''
else:
_op[0] = _resolve(_op[0], ignore_kw=True)
ignore_kw = False
_op[2] = _resolve(_op[2], ignore_kw=ignore_kw)
opers[idx] = ''.join(_op)
asm = "{0} {1}".format(mnem, ','.join(opers))
return asm
# return bytes of instruction or data
# return None on failure
def ida_get_item(self, address, hex_output=False):
if self.check_address(address) != 1:
# not a valid address
return (None, 0)
# return None if address is in the middle of instruction / data
if address != idc.ItemHead(address):
return (None, 0)
len = idc.ItemSize(address)
item = idaapi.get_many_bytes(address, len)
if item is None:
return (None, 0)
if hex_output:
item = to_hexstr(item)
return (item, len)
@staticmethod
def get_op_dtype_name(op_idx):
dtyp_lists = {
idaapi.dt_byte: 'byte', # 8 bit
idaapi.dt_word: 'word', # 16 bit
idaapi.dt_dword: 'dword', # 32 bit
idaapi.dt_float: 'dword', # 4 byte
idaapi.dt_double: 'dword', # 8 byte
#idaapi.dt_tbyte = 5 # variable size (ph.tbyte_size)
#idaapi.dt_packreal = 6 # packed real format for mc68040
idaapi.dt_qword: 'qword', # 64 bit
idaapi.dt_byte16: 'xmmword',# 128 bit
#idaapi.dt_code = 9 # ptr to code (not used?)
#idaapi.dt_void = 10 # none
#idaapi.dt_fword = 11 # 48 bit
#idaapi.dt_bitfild = 12 # bit field (mc680x0)
#idaapi.dt_string = 13 # pointer to asciiz string
#idaapi.dt_unicode = 14 # pointer to unicode string
#idaapi.dt_3byte = 15 # 3-byte data
#idaapi.dt_ldbl = 16 # long double (which may be different from tbyte)
idaapi.dt_byte32: 'ymmword',# 256 bit
}
dtype = idaapi.cmd.Operands[op_idx].dtyp
dtyp_size = idaapi.get_dtyp_size(dtype)
if dtype == idaapi.dt_tbyte:
if dtyp_size == 10:
return 'xword'
dtyp_name = dtyp_lists.get(idaapi.cmd.Operands[op_idx].dtyp, None)
return dtyp_name
# return asm instructions from start to end
def ida_get_disasm_range(self, start, end):
codes = []
while start < end:
asm = self.asm_normalize(idc.GetDisasm(start))
if asm == None:
asm = ''
codes.append(asm)
start = start + idc.ItemSize(start)
return codes
# get disasm from IDA
# return '' on invalid address
def ida_get_disasm(self, address, fixup=False):
def GetMnem(asm):
sp = asm.find(' ')
if sp == -1:
return asm
return asm[:sp]
if self.check_address(address) != 1:
# not a valid address
return ''
# return if address is in the middle of instruction / data
if address != idc.ItemHead(address):
return ''
asm = self.asm_normalize(idc.GetDisasm(address))
# for now, only support IDA syntax fixup for Intel CPU
if not fixup or self.arch != KS_ARCH_X86:
return asm
# KS_ARCH_X86 mode
# rebuild disasm code from IDA
i = 0
mnem = GetMnem(asm)
if mnem == '' or mnem in ('rep', 'repne', 'repe'):
return asm
opers = []
while GetOpType(address, i) > 0 and i < 6:
t = GetOpType(address, i)
o = GetOpnd(address, i)
if t in (idc.o_mem, idc.o_displ):
parts = list(o.partition(':'))
if parts[2] == '':
parts[2] = parts[0]
parts[0] = ''
if '[' not in parts[2]:
parts[2] = '[{0}]'.format(parts[2])
o = ''.join(parts)
if 'ptr ' not in o:
dtyp_name = self.get_op_dtype_name(i)
if dtyp_name != None:
o = "{0} ptr {1}".format(dtyp_name, o)
opers.append(o)
i += 1
asm = mnem
for o in opers:
if o != '':
asm = "{0} {1},".format(asm, o)
asm = asm.strip(',')
return asm
# assemble code with Keystone
# return (encoding, count), or (None, 0) on failure
def assemble(self, assembly, address, arch=None, mode=None, syntax=None):
# return assembly with arithmetic equation evaluated
def eval_operand(assembly, start, stop, prefix=''):
imm = assembly[start+1:stop]
try:
eval_imm = eval(imm)
if eval_imm > 0x80000000:
eval_imm = 0xffffffff - eval_imm
eval_imm += 1
eval_imm = -eval_imm
return assembly.replace(prefix + imm, prefix + hex(eval_imm))
except:
return assembly
# IDA uses different syntax from Keystone
# sometimes, we can convert code to be consumable by Keystone
def fix_ida_syntax(assembly):
# return True if this insn needs to be fixed
def check_arm_arm64_insn(arch, mnem):
if arch == KS_ARCH_ARM:
if mnem.startswith("ldr") or mnem.startswith("str"):
return True
return False
elif arch == KS_ARCH_ARM64:
if mnem.startswith("ldr") or mnem.startswith("str"):
return True
return mnem in ("stp")
return False
# return True if this insn needs to be fixed
def check_ppc_insn(mnem):
return mnem in ("stw")
# replace the right most string occurred
def rreplace(s, old, new):
li = s.rsplit(old, 1)
return new.join(li)
# convert some ARM pre-UAL assembly to UAL, so Keystone can handle it
# example: streqb --> strbeq
def fix_arm_ual(mnem, assembly):
# TODO: this is not an exhaustive list yet
if len(mnem) != 6:
return assembly
if (mnem[-1] in ('s', 'b', 'h', 'd')):
#print(">> 222", mnem[3:5])
if mnem[3:5] in ("cc", "eq", "ne", "hs", "lo", "mi", "pl", "vs", "vc", "hi", "ls", "ge", "lt", "gt", "le", "al"):
return assembly.replace(mnem, mnem[:3] + mnem[-1] + mnem[3:5], 1)
return assembly
if self.arch != KS_ARCH_X86:
assembly = assembly.lower()
else:
# Keystone does not support immediate 0bh, but only 0Bh
assembly = assembly.upper()
# however, 0X must be converted to 0x
# Keystone should fix this limitation in the future
assembly = assembly.replace("0X", " 0x")
_asm = assembly.partition(' ')
mnem = _asm[0]
if mnem == '':
return assembly
# for PPC, Keystone does not accept registers with 'r' prefix,
# but only the number behind. lets try to fix that here by
# removing the prefix 'r'.
if self.arch == KS_ARCH_PPC:
for n in range(32):
r = " r%u," %n
if r in assembly:
assembly = assembly.replace(r, " %u," %n)
for n in range(32):
r = "(r%u)" %n
if r in assembly:
assembly = assembly.replace(r, "(%u)" %n)
for n in range(32):
r = ", r%u" %n
if assembly.endswith(r):
assembly = rreplace(assembly, r, ", %u" %n)
if self.arch == KS_ARCH_X86:
if mnem == "RETN":
# replace retn with ret
return assembly.replace('RETN', 'RET', 1)
if 'OFFSET ' in assembly:
return assembly.replace('OFFSET ', ' ')
if mnem in ('CALL', 'JMP') or mnem.startswith('LOOP'):
# remove 'NEAR PTR'
if ' NEAR PTR ' in assembly:
return assembly.replace(' NEAR PTR ', ' ')
elif mnem[0] == 'J':
# JMP instruction
if ' SHORT ' in assembly:
# remove ' short '
return assembly.replace(' SHORT ', ' ')
elif self.arch in (KS_ARCH_ARM, KS_ARCH_ARM64, KS_ARCH_PPC):
# *** ARM
# LDR R1, [SP+rtld_fini],#4
# STR R2, [SP,#-4+rtld_fini]!
# STR R0, [SP,#fini]!
# STR R12, [SP,#4+var_8]!
# *** ARM64
# STP X29, X30, [SP,#-0x10+var_150]!
# STR W0, [X29,#0x150+var_8]
# LDR X0, [X0,#(qword_4D6678 - 0x4D6660)]
# TODO:
# ADRP X19, #interactive@PAGE
# *** PPC
# stw r5, 0x120+var_108(r1)
if self.arch == KS_ARCH_ARM:
#print(">> before UAL fix: ", assembly)
assembly = fix_arm_ual(mnem, assembly)
#print(">> after UAL fix: ", assembly)
if check_arm_arm64_insn(self.arch, mnem) or (("[" in assembly) and ("]" in assembly)):
bang = assembly.find('#')
bracket = assembly.find(']')
if bang != -1 and bracket != -1 and bang < bracket:
return eval_operand(assembly, bang, bracket, '#')
elif '+0x0]' in assembly:
return assembly.replace('+0x0]', ']')
elif check_ppc_insn(mnem):
start = assembly.find(', ')
stop = assembly.find('(')
if start != -1 and stop != -1 and start < stop:
return eval_operand(assembly, start, stop)
return assembly
def is_thumb(address):
return idc.GetReg(address, 'T') == 1
if self.check_address(address) == 0:
return (None, 0)
# use default syntax, arch and mode if not provided
if syntax is None:
syntax = self.syntax
if arch is None:
arch = self.arch
if mode is None:
mode = self.mode
if arch == KS_ARCH_ARM and is_thumb(address):
mode = KS_MODE_THUMB
try:
ks = Ks(arch, mode)
if arch == KS_ARCH_X86:
ks.syntax = syntax
encoding, count = ks.asm(fix_ida_syntax(assembly), address)
except KsError as e:
# keep the below code for debugging
#print("Keypatch Error: {0}".format(e))
#print("Original asm: {0}".format(assembly))
#print("Fixed up asm: {0}".format(fix_ida_syntax(assembly)))
encoding, count = None, 0
return (encoding, count)
# patch at address, return the number of written bytes & original data
# this process can fail in some cases
@staticmethod
def patch_raw(address, patch_data, len):
ea = address
orig_data = ''
while ea < (address + len):
if not idc.hasValue(idc.GetFlags(ea)):
print("Keypatch: FAILED to read data at 0x{0:X}".format(ea))
break
orig_byte = idc.Byte(ea)
orig_data += chr(orig_byte)
patch_byte = ord(patch_data[ea - address])
if patch_byte != orig_byte:
# patch one byte
if idaapi.patch_byte(ea, patch_byte) != 1:
print("Keypatch: FAILED to patch byte at 0x{0:X} [0x{1:X}]".format(ea, patch_byte))
break
ea += 1
return (ea - address, orig_data)
# patch at address, return the number of written bytes & original data
# on patch failure, we revert to the original code, then return (None, None)
def patch(self, address, patch_data, len):
# save original function end to fix IDA re-analyze issue after patching
orig_func_end = idc.GetFunctionAttr(address, idc.FUNCATTR_END)
(patched_len, orig_data) = self.patch_raw(address, patch_data, len)
if len != patched_len:
# patch failure
if patched_len > 0:
# revert the changes
(rlen, _) = self.patch_raw(address, orig_data, patched_len)
if rlen == patched_len:
print("Keypatch: successfully reverted changes of {0:d} byte(s) at 0x{1:X} [{2}]".format(
patched_len, address, to_hexstr(orig_data)))
else:
print("Keypatch: FAILED to revert changes of {0:d} byte(s) at 0x{1:X} [{2}]".format(
patched_len, address, to_hexstr(orig_data)))
return (None, None)
# ask IDA to re-analyze the patched area
if orig_func_end == idc.BADADDR:
# only analyze patched bytes, otherwise it would take a lot of time to re-analyze the whole binary
idaapi.analyze_area(address, address + patched_len + 1)
else:
idaapi.analyze_area(address, orig_func_end)
# try to fix IDA function re-analyze issue after patching
idaapi.func_setend(address, orig_func_end)
return (patched_len, orig_data)
# return number of bytes patched
# return
# 0 Invalid assembly
# -1 PatchByte failure
# -2 Can't read original data
# -3 Invalid address
def patch_code(self, address, assembly, syntax, padding, save_origcode, orig_asm=None, patch_data=None, patch_comment=None, undo=False):
global patch_info
if self.check_address(address) != 1:
# not a valid address
return -3
orig_comment = idc.Comment(address)
if orig_comment is None:
orig_comment = ''
nop_comment = ""
padding_len = 0
if not undo:
# we are patching via Patcher
(orig_encoding, orig_len) = self.ida_get_item(address)
if (orig_encoding, orig_len) == (None, 0):
return -2
(encoding, count) = self.assemble(assembly, address, syntax=syntax)
if encoding is None:
return 0
patch_len = len(encoding)
patch_data = ''.join(chr(c) for c in encoding)
if patch_data == orig_encoding:
#print("Keypatch: no need to patch, same encoding data [{0}] at 0x{1:X}".format(to_hexstr(orig_encoding), address))
return orig_len
# for now, only support NOP padding on Intel CPU
if padding and self.arch == KS_ARCH_X86:
if patch_len < orig_len:
padding_len = orig_len - patch_len
patch_len = orig_len
patch_data = patch_data.ljust(patch_len, X86_NOP)
elif patch_len > orig_len:
patch_end = address + patch_len - 1
ins_end = ItemEnd(patch_end)
padding_len = ins_end - patch_end - 1
if padding_len > 0:
patch_len = ins_end - address
patch_data = patch_data.ljust(patch_len, X86_NOP)
if padding_len > 0:
nop_comment = "\nKeypatch padded NOP to next boundary: {0} bytes".format(padding_len)
orig_asm = self.ida_get_disasm_range(address, address + patch_len)
else:
# we are reverting the change via "Undo" menu
patch_len = len(patch_data)
(plen, p_orig_data) = self.patch(address, patch_data, patch_len)
if plen is None:
# failed to patch
return -1
if not undo: # we are patching
new_patch_comment = None
if save_origcode is True:
# append original instruction to comments
if orig_comment == '':
new_patch_comment = "Keypatch modified this from:\n {0}{1}".format('\n '.join(orig_asm), nop_comment)
else:
new_patch_comment = "\nKeypatch modified this from:\n {0}{1}".format('\n '.join(orig_asm), nop_comment)
new_comment = "{0}{1}".format(orig_comment, new_patch_comment)
idc.MakeComm(address, new_comment)
if padding_len == 0:
print("Keypatch: successfully patched {0:d} byte(s) at 0x{1:X} from [{2}] to [{3}]".format(plen,
address, to_hexstr(p_orig_data), to_hexstr(patch_data)))
else:
print("Keypatch: successfully patched {0:d} byte(s) at 0x{1:X} from [{2}] to [{3}], with {4} byte(s) NOP padded".format(plen,
address, to_hexstr(p_orig_data), to_hexstr(patch_data), padding_len))
# save this patching for future "undo"
patch_info.append((address, assembly, p_orig_data, new_patch_comment))
else: # we are reverting
if patch_comment:
# clean previous IDA comment by replacing it with ''
new_comment = orig_comment.replace(patch_comment, '')
idc.MakeComm(address, new_comment)
print("Keypatch: successfully reverted {0:d} byte(s) at 0x{1:X} from [{2}] to [{3}]".format(plen,
address, to_hexstr(p_orig_data), to_hexstr(patch_data)))
return plen
# fill a range of code [addr_begin, addr_end].
# return the length of patched area
# on failure, return 0 = wrong input, -1 = failed to patch
def fill_code(self, addr_begin, addr_end, assembly, syntax, padding, save_origcode, orig_asm=None):
# treat input as assembly code first
(encoding, _) = self.assemble(assembly, addr_begin, syntax=syntax)
if encoding is None:
# input might be a hexcode string. try to convert it to raw bytes
encoding = convert_hexstr(assembly)
if encoding is None:
# invalid input: this is neither assembly nor hexcode string
return 0
# save original assembly code before overwritting them
orig_asm = self.ida_get_disasm_range(addr_begin, addr_end)
# save original comment at addr_begin
# TODO: save comments in this range, but how to interleave them?
orig_comment = idc.Comment(addr_begin)
if orig_comment is None:
orig_comment = ''
patch_data = ""
assembly_new = []
size = addr_end - addr_begin
# calculate filling data
encode_chr = ''.join(chr(c) for c in encoding)
while True:
if len(patch_data) + len(encode_chr) <= size:
patch_data = patch_data + encode_chr
assembly_new += [assembly.strip()]
else:
break
# for now, only support NOP padding on Intel CPU
if padding and self.arch == KS_ARCH_X86:
for i in range(size -len(patch_data)):
assembly_new += ["nop"]
patch_data = patch_data.ljust(size, X86_NOP)
(plen, p_orig_data) = self.patch(addr_begin, patch_data, len(patch_data))
if plen is None:
# failed to patch
return -1
new_patch_comment = ''
# append original instruction to comments
if save_origcode is True:
if orig_comment == '':
new_patch_comment = "Keypatch filled range [0x{0:X}:0x{1:X}] ({2} bytes), replaced:\n {3}".format(addr_begin, addr_end - 1, addr_end - addr_begin, '\n '.join(orig_asm))
else:
new_patch_comment = "\nKeypatch filled range [0x{0:X}:0x{1:X}] ({2} bytes), replaced:\n {3}".format(addr_begin, addr_end - 1, addr_end - addr_begin, '\n '.join(orig_asm))
new_comment = "{0}{1}".format(orig_comment, new_patch_comment)
idc.MakeComm(addr_begin, new_comment)
print("Keypatch: successfully filled range [0x{0:X}:0x{1:X}] ({2} bytes) with \"{3}\", replaced \"{4}\"".format(
addr_begin, addr_end - 1, addr_end - addr_begin, assembly, '; '.join(orig_asm)))
# save this modification for future "undo"
patch_info.append((addr_begin, '\n '.join(assembly_new), p_orig_data, new_patch_comment))
return plen
### Form helper functions
@staticmethod
def dict_to_ordered_list(dictionary):
list = sorted(dictionary.items(), key=lambda t: t[0], reverse=False)
keys = [i[0] for i in list]
values = [i[1] for i in list]
return (keys, values)
def get_value_by_idx(self, dictionary, idx, default=None):
(keys, values) = self.dict_to_ordered_list(dictionary)
try:
val = values[idx]
except IndexError:
val = default
return val
def find_idx_by_value(self, dictionary, value, default=None):
(keys, values) = self.dict_to_ordered_list(dictionary)
try:
idx = values.index(value)
except:
idx = default
return idx
def get_arch_by_idx(self, idx):
return self.get_value_by_idx(self.arch_lists, idx)
def find_arch_idx(self, arch, mode):
return self.find_idx_by_value(self.arch_lists, (arch, mode))
def get_syntax_by_idx(self, idx):
return self.get_value_by_idx(self.syntax_lists, idx, self.syntax)
def find_syntax_idx(self, syntax):
return self.find_idx_by_value(self.syntax_lists, syntax)
### /Form helper functions
# Common ancestor form to be derived by Patcher, FillRange & Search
class Keypatch_Form(idaapi.Form):
# prepare for form initializing
def setup(self, kp_asm, address, assembly=None):
self.kp_asm = kp_asm
self.address = address
# update ordered list of arch and syntax
self.syntax_keys = self.kp_asm.dict_to_ordered_list(self.kp_asm.syntax_lists)[0]
self.arch_keys = self.kp_asm.dict_to_ordered_list(self.kp_asm.arch_lists)[0]
# update current arch & mode
self.kp_asm.update_hardware_mode()
# find right value for c_arch & c_endian controls
mode = self.kp_asm.mode
self.endian_id = 0 # little endian
if self.kp_asm.mode & KS_MODE_BIG_ENDIAN:
self.endian_id = 1 # big endian
mode = self.kp_asm.mode - KS_MODE_BIG_ENDIAN
self.arch_id = self.kp_asm.find_arch_idx(self.kp_asm.arch, mode)
self.syntax_id = 0 # to make non-X86 arch happy
if self.kp_asm.arch == KS_ARCH_X86:
self.syntax_id = self.kp_asm.find_syntax_idx(self.kp_asm.syntax)
# get original instruction and bytes
self.orig_asm = kp_asm.ida_get_disasm(address)
(self.orig_encoding, self.orig_len) = kp_asm.ida_get_item(address, hex_output=True)
if self.orig_encoding is None:
self.orig_encoding = ''
if assembly is None:
self.asm = self.kp_asm.ida_get_disasm(self.address, fixup=True)
else:
self.asm = assembly
# update Encoding control
# return True on success, False on failure
def _update_encoding(self, arch, mode):
try:
syntax = None
if arch == KS_ARCH_X86:
syntax_id = self.GetControlValue(self.c_syntax)
syntax = self.kp_asm.get_syntax_by_idx(syntax_id)
address = self.GetControlValue(self.c_addr)
try:
idaapi.isEnabled(address)
except:
# invalid address value
address = 0
assembly = self.GetControlValue(self.c_assembly)
raw_assembly = self.kp_asm.ida_resolve(assembly, address)
self.SetControlValue(self.c_raw_assembly, raw_assembly)
(encoding, count) = self.kp_asm.assemble(raw_assembly, address, arch=arch,
mode=mode, syntax=syntax)
if encoding is None:
self.SetControlValue(self.c_encoding, ENCODING_ERR_OUTPUT)
self.SetControlValue(self.c_encoding_len, 0)
return False
else:
text = ""
for byte in encoding:
text += "%02X " % byte
text.strip()
if text == "":
# error?
self.SetControlValue(self.c_encoding, ENCODING_ERR_OUTPUT)
return False
else:
self.SetControlValue(self.c_encoding, text.strip())
self.SetControlValue(self.c_encoding_len, len(encoding))
return True
except Exception,e:
print (str(e))
import traceback
traceback.print_exc()
self.SetControlValue(self.c_encoding, ENCODING_ERR_OUTPUT)
return False
# callback to be executed when any form control changed
def OnFormChange(self, fid):
return 1
# update Patcher & Fillrange controls
def update_patchform(self, fid):
self.EnableField(self.c_endian, False)
self.EnableField(self.c_addr, False)
(arch, mode) = (self.kp_asm.arch, self.kp_asm.mode)
# assembly is focused
self.SetFocusedField(self.c_assembly)
if arch == KS_ARCH_X86:
# do not show Endian control
self.ShowField(self.c_endian, False)
# allow to choose Syntax
self.ShowField(self.c_syntax, True)
self.ShowField(self.c_opt_padding, True)
else: # do not show Syntax control for non-X86 mode
self.ShowField(self.c_syntax, False)
# for now, we do not support padding for non-X86 archs
self.ShowField(self.c_opt_padding, False)
#self.EnableField(self.c_opt_padding, False)
# update other controls & Encoding with live assembling
self.update_controls(arch, mode)