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
|
; RUN: rm -rf %t
; RUN: split-file %s %t
; RUN: yaml2obj %t/payload-extended.yaml -o %t/payload-extended.dylib
; RUN: llvm-objdump --macho --exports-trie %t/payload-extended.dylib 2>&1 | FileCheck %s
; CHECK: 0x00003FB0 _foo
; RUN: yaml2obj %t/payload-truncated.yaml -o %t/payload-truncated.dylib
; RUN: not llvm-objdump --macho --exports-trie %t/payload-truncated.dylib 2>&1 | FileCheck %s --check-prefix=WRONG_SIZE
; WRONG_SIZE: truncated or malformed object (inconsistent export info size: 0x2 where actual size was: 0x3 in export trie data at node: 0x8)
# Yaml was manually crafted to have an export trie with a node entry
# where it's payload is larger than the size needed to read it.
;--- payload-extended.yaml
--- !mach-o
FileHeader:
magic: 0xFEEDFACF
cputype: 0x100000C
cpusubtype: 0x0
filetype: 0x6
ncmds: 13
sizeofcmds: 680
flags: 0x100085
reserved: 0x0
LoadCommands:
- cmd: LC_SEGMENT_64
cmdsize: 232
segname: __TEXT
vmaddr: 0
vmsize: 16384
fileoff: 0
filesize: 16384
maxprot: 5
initprot: 5
nsects: 2
flags: 0
Sections:
- sectname: __text
segname: __TEXT
addr: 0x3FB0
size: 8
offset: 0x3FB0
align: 2
reloff: 0x0
nreloc: 0
flags: 0x80000400
reserved1: 0x0
reserved2: 0x0
reserved3: 0x0
content: 20008052C0035FD6
- sectname: __unwind_info
segname: __TEXT
addr: 0x3FB8
size: 72
offset: 0x3FB8
align: 2
reloff: 0x0
nreloc: 0
flags: 0x0
reserved1: 0x0
reserved2: 0x0
reserved3: 0x0
content: 010000001C000000000000001C000000000000001C00000002000000B03F00003400000034000000B93F00000000000034000000030000000C000100100001000000000000000002
- cmd: LC_SEGMENT_64
cmdsize: 72
segname: __LINKEDIT
vmaddr: 16384
vmsize: 16384
fileoff: 16384
filesize: 361
maxprot: 1
initprot: 1
nsects: 0
flags: 0
- cmd: LC_ID_DYLIB
cmdsize: 48
dylib:
name: 24
timestamp: 1
current_version: 0
compatibility_version: 0
Content: '@rpath/libfoo.dylib'
ZeroPadBytes: 5
- cmd: LC_DYLD_INFO_ONLY
cmdsize: 48
rebase_off: 0
rebase_size: 0
bind_off: 0
bind_size: 0
weak_bind_off: 0
weak_bind_size: 0
lazy_bind_off: 0
lazy_bind_size: 0
export_off: 16384
export_size: 16
- cmd: LC_SYMTAB
cmdsize: 24
symoff: 16408
nsyms: 2
stroff: 16440
strsize: 24
- cmd: LC_DYSYMTAB
cmdsize: 80
ilocalsym: 0
nlocalsym: 0
iextdefsym: 0
nextdefsym: 1
iundefsym: 1
nundefsym: 1
tocoff: 0
ntoc: 0
modtaboff: 0
nmodtab: 0
extrefsymoff: 0
nextrefsyms: 0
indirectsymoff: 0
nindirectsyms: 0
extreloff: 0
nextrel: 0
locreloff: 0
nlocrel: 0
- cmd: LC_UUID
cmdsize: 24
uuid: A2CF51D8-828B-3E0F-B8FA-0DF9C5D1C91A
- cmd: LC_BUILD_VERSION
cmdsize: 32
platform: 1
minos: 721664
sdk: 917504
ntools: 1
Tools:
- tool: 3
version: 59441152
- cmd: LC_SOURCE_VERSION
cmdsize: 16
version: 0
- cmd: LC_LOAD_DYLIB
cmdsize: 56
dylib:
name: 24
timestamp: 2
current_version: 87556096
compatibility_version: 65536
Content: '/usr/lib/libSystem.B.dylib'
ZeroPadBytes: 6
- cmd: LC_FUNCTION_STARTS
cmdsize: 16
dataoff: 16400
datasize: 8
- cmd: LC_DATA_IN_CODE
cmdsize: 16
dataoff: 16408
datasize: 0
- cmd: LC_CODE_SIGNATURE
cmdsize: 16
dataoff: 16464
datasize: 281
LinkEditData:
ExportTrie:
TerminalSize: 0
NodeOffset: 0
Name: ''
Flags: 0x0
Address: 0x0
Other: 0x0
ImportName: ''
Children:
- TerminalSize: 4
NodeOffset: 8
Name: _foo
Flags: 0x0
Address: 0x3FB0
Other: 0x0
ImportName: ''
NameList:
- n_strx: 2
n_type: 0xF
n_sect: 1
n_desc: 0
n_value: 16304
- n_strx: 7
n_type: 0x1
n_sect: 0
n_desc: 256
n_value: 0
StringTable:
- ' '
- _foo
- dyld_stub_binder
FunctionStarts: [ 0x3FB0 ]
...
# Yaml was manually crafted to have an export trie with a node entry
# where it's payload is smaller than the size needed to read it.
;--- payload-truncated.yaml
--- !mach-o
FileHeader:
magic: 0xFEEDFACF
cputype: 0x100000C
cpusubtype: 0x0
filetype: 0x6
ncmds: 13
sizeofcmds: 680
flags: 0x100085
reserved: 0x0
LoadCommands:
- cmd: LC_SEGMENT_64
cmdsize: 232
segname: __TEXT
vmaddr: 0
vmsize: 16384
fileoff: 0
filesize: 16384
maxprot: 5
initprot: 5
nsects: 2
flags: 0
Sections:
- sectname: __text
segname: __TEXT
addr: 0x3FB0
size: 8
offset: 0x3FB0
align: 2
reloff: 0x0
nreloc: 0
flags: 0x80000400
reserved1: 0x0
reserved2: 0x0
reserved3: 0x0
content: 20008052C0035FD6
- sectname: __unwind_info
segname: __TEXT
addr: 0x3FB8
size: 72
offset: 0x3FB8
align: 2
reloff: 0x0
nreloc: 0
flags: 0x0
reserved1: 0x0
reserved2: 0x0
reserved3: 0x0
content: 010000001C000000000000001C000000000000001C00000002000000B03F00003400000034000000B93F00000000000034000000030000000C000100100001000000000000000002
- cmd: LC_SEGMENT_64
cmdsize: 72
segname: __LINKEDIT
vmaddr: 16384
vmsize: 16384
fileoff: 16384
filesize: 361
maxprot: 1
initprot: 1
nsects: 0
flags: 0
- cmd: LC_ID_DYLIB
cmdsize: 48
dylib:
name: 24
timestamp: 1
current_version: 0
compatibility_version: 0
Content: '@rpath/libfoo.dylib'
ZeroPadBytes: 5
- cmd: LC_DYLD_INFO_ONLY
cmdsize: 48
rebase_off: 0
rebase_size: 0
bind_off: 0
bind_size: 0
weak_bind_off: 0
weak_bind_size: 0
lazy_bind_off: 0
lazy_bind_size: 0
export_off: 16384
export_size: 16
- cmd: LC_SYMTAB
cmdsize: 24
symoff: 16408
nsyms: 2
stroff: 16440
strsize: 24
- cmd: LC_DYSYMTAB
cmdsize: 80
ilocalsym: 0
nlocalsym: 0
iextdefsym: 0
nextdefsym: 1
iundefsym: 1
nundefsym: 1
tocoff: 0
ntoc: 0
modtaboff: 0
nmodtab: 0
extrefsymoff: 0
nextrefsyms: 0
indirectsymoff: 0
nindirectsyms: 0
extreloff: 0
nextrel: 0
locreloff: 0
nlocrel: 0
- cmd: LC_UUID
cmdsize: 24
uuid: A2CF51D8-828B-3E0F-B8FA-0DF9C5D1C91A
- cmd: LC_BUILD_VERSION
cmdsize: 32
platform: 1
minos: 721664
sdk: 917504
ntools: 1
Tools:
- tool: 3
version: 59441152
- cmd: LC_SOURCE_VERSION
cmdsize: 16
version: 0
- cmd: LC_LOAD_DYLIB
cmdsize: 56
dylib:
name: 24
timestamp: 2
current_version: 87556096
compatibility_version: 65536
Content: '/usr/lib/libSystem.B.dylib'
ZeroPadBytes: 6
- cmd: LC_FUNCTION_STARTS
cmdsize: 16
dataoff: 16400
datasize: 8
- cmd: LC_DATA_IN_CODE
cmdsize: 16
dataoff: 16408
datasize: 0
- cmd: LC_CODE_SIGNATURE
cmdsize: 16
dataoff: 16464
datasize: 281
LinkEditData:
ExportTrie:
TerminalSize: 0
NodeOffset: 0
Name: ''
Flags: 0x0
Address: 0x0
Other: 0x0
ImportName: ''
Children:
- TerminalSize: 2
NodeOffset: 8
Name: _foo
Flags: 0x0
Address: 0x3FB0
Other: 0x0
ImportName: ''
NameList:
- n_strx: 2
n_type: 0xF
n_sect: 1
n_desc: 0
n_value: 16304
- n_strx: 7
n_type: 0x1
n_sect: 0
n_desc: 256
n_value: 0
StringTable:
- ' '
- _foo
- dyld_stub_binder
FunctionStarts: [ 0x3FB0 ]
...
|
