{{ message }}
Repository navigation
Expand file tree
/
Copy pathDarwinFindSymbol.cpp
More file actions
326 lines (262 loc) · 10.2 KB
/
Copy pathDarwinFindSymbol.cpp
File metadata and controls
326 lines (262 loc) · 10.2 KB
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
/* Cydia Substrate - Powerful Code Insertion Platform
* Copyright (C) 2008-2011 Jay Freeman (saurik)
*/
/* GNU Lesser General Public License, Version 3 {{{ */
/*
* Substrate is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* Substrate is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Substrate. If not, see <http://www.gnu.org/licenses/>.
**/
/* }}} */
#include <mach/mach.h>
#include <mach/mach_init.h>
#include <mach-o/dyld.h>
#include <mach-o/fat.h>
#include <mach-o/loader.h>
extern "C" {
#include <mach-o/nlist.h>
}
#define BSD_KERNEL_PRIVATE
#include <machine/types.h>
#include <machine/exec.h>
#include <stdio.h>
#include <stdlib.h>
#include "CydiaSubstrate.h"
#define _trace() do { \
MSLog(MSLogLevelNotice, "_trace(%u)", __LINE__); \
} while (false)
struct MSSymbolData {
const char *name_;
uint8_t type_;
uint8_t sect_;
int16_t desc_;
uintptr_t value_;
};
#ifdef __LP64__
typedef struct mach_header_64 mach_header_xx;
typedef struct nlist_64 nlist_xx;
typedef struct segment_command_64 segment_command_xx;
static const uint32_t LC_SEGMENT_XX = LC_SEGMENT_64;
static const uint32_t MH_MAGIC_XX = MH_MAGIC_64;
#else
typedef struct mach_header mach_header_xx;
typedef struct nlist nlist_xx;
typedef struct segment_command segment_command_xx;
static const uint32_t LC_SEGMENT_XX = LC_SEGMENT;
static const uint32_t MH_MAGIC_XX = MH_MAGIC;
#endif
static ssize_t MSMachONameList_(const void *stuff, struct MSSymbolData *list, size_t nreq) {
// XXX: ok, this is just pathetic; API fail much?
size_t slide(0);
for (uint32_t image(0), images(_dyld_image_count()); image != images; ++image)
if (_dyld_get_image_header(image) == stuff) {
slide = _dyld_get_image_vmaddr_slide(image);
goto fat;
}
return -1;
fat:
const uint8_t *base(reinterpret_cast<const uint8_t *>(stuff));
const struct exec *buf(reinterpret_cast<const struct exec *>(base));
if (OSSwapBigToHostInt32(buf->a_magic) == FAT_MAGIC) {
struct host_basic_info hbi; {
host_t host(mach_host_self());
mach_msg_type_number_t count(HOST_BASIC_INFO_COUNT);
if (host_info(host, HOST_BASIC_INFO, reinterpret_cast<host_info_t>(&hbi), &count) != KERN_SUCCESS)
return -1;
mach_port_deallocate(mach_task_self(), host);
}
const struct fat_header *fh(reinterpret_cast<const struct fat_header *>(base));
uint32_t nfat_arch(OSSwapBigToHostInt32(fh->nfat_arch));
const struct fat_arch *fat_archs(reinterpret_cast<const struct fat_arch *>(fh + 1));
for (uint32_t i(0); i != nfat_arch; ++i)
if (static_cast<cpu_type_t>(OSSwapBigToHostInt32(fat_archs[i].cputype)) == hbi.cpu_type) {
buf = reinterpret_cast<const struct exec *>(base + OSSwapBigToHostInt32(fat_archs[i].offset));
goto thin;
}
return -1;
}
thin:
const nlist_xx *symbols;
const char *strings;
size_t n;
// XXX: this check looks really scary when it fails
if (buf->a_magic == MH_MAGIC_XX) {
const mach_header_xx *mh(reinterpret_cast<const mach_header_xx *>(base));
const struct load_command *load_commands(reinterpret_cast<const struct load_command *>(mh + 1));
const struct symtab_command *stp(NULL);
const struct load_command *lcp;
/* forlc (command, mh, LC_SYMTAB, struct symtab_command) {
stp = command;
goto found;
} */
lcp = load_commands;
for (uint32_t i(0); i != mh->ncmds; ++i) {
if (
lcp->cmdsize % sizeof(long) != 0 || lcp->cmdsize <= 0 ||
reinterpret_cast<const uint8_t *>(lcp) + lcp->cmdsize > reinterpret_cast<const uint8_t *>(load_commands) + mh->sizeofcmds
)
return -1;
if (lcp->cmd == LC_SYMTAB) {
if (lcp->cmdsize != sizeof(struct symtab_command))
return -1;
stp = reinterpret_cast<const struct symtab_command *>(lcp);
goto found;
}
lcp = reinterpret_cast<const struct load_command *>(reinterpret_cast<const uint8_t *>(lcp) + lcp->cmdsize);
}
return -1;
found:
n = stp->nsyms;
symbols = NULL;
strings = NULL;
/* forlc (command, mh, LC_SEGMENT_XX, segment_command_xx) {
stp = command;
goto found;
} */
lcp = load_commands;
for (uint32_t i(0); i != mh->ncmds; ++i) {
if (
lcp->cmdsize % sizeof(long) != 0 || lcp->cmdsize <= 0 ||
reinterpret_cast<const uint8_t *>(lcp) + lcp->cmdsize > reinterpret_cast<const uint8_t *>(load_commands) + mh->sizeofcmds
)
return -1;
if (lcp->cmd == LC_SEGMENT_XX) {
if (lcp->cmdsize < sizeof(segment_command_xx))
return -1;
const segment_command_xx *segment(reinterpret_cast<const segment_command_xx *>(lcp));
if (stp->symoff >= segment->fileoff && stp->symoff < segment->fileoff + segment->filesize)
symbols = reinterpret_cast<const nlist_xx *>(stp->symoff - segment->fileoff + segment->vmaddr + slide);
if (stp->stroff >= segment->fileoff && stp->stroff < segment->fileoff + segment->filesize)
strings = reinterpret_cast<const char *>(stp->stroff - segment->fileoff + segment->vmaddr + slide);
}
lcp = reinterpret_cast<const struct load_command *>(reinterpret_cast<const uint8_t *>(lcp) + lcp->cmdsize);
}
if (symbols == NULL || strings == NULL)
return -1;
// XXX: detect a.out somehow?
} else if (false) {
/* XXX: is this right anymore?!? */
symbols = reinterpret_cast<const nlist_xx *>(base + N_SYMOFF(*buf));
strings = reinterpret_cast<const char *>(reinterpret_cast<const uint8_t *>(symbols) + buf->a_syms);
n = buf->a_syms / sizeof(nlist_xx);
} else return -1;
size_t result(nreq);
for (size_t m(0); m != n; ++m) {
const nlist_xx *q(&symbols[m]);
if (q->n_un.n_strx == 0 || (q->n_type & N_STAB) != 0)
continue;
const char *nambuf(strings + q->n_un.n_strx);
//fprintf(stderr, " == %s\n", nambuf);
for (size_t item(0); item != nreq; ++item) {
struct MSSymbolData *p(list + item);
if (p->name_ == NULL || strcmp(p->name_, nambuf) != 0)
continue;
p->name_ = NULL;
p->value_ = q->n_value;
if (p->value_ != 0)
p->value_ += slide;
p->type_ = q->n_type;
p->desc_ = q->n_desc;
p->sect_ = q->n_sect;
if (--result == 0)
return 0;
break;
}
}
return result;
}
_extern MSImageRef MSGetImageByName(const char *file) {
for (uint32_t image(0), images(_dyld_image_count()); image != images; ++image)
if (strcmp(_dyld_get_image_name(image), file) == 0)
return _dyld_get_image_header(image);
return NULL;
}
static void MSFindSymbols(MSImageRef image, size_t count, const char *names[], void *values[]) {
MSSymbolData items[count];
for (size_t index(0); index != count; ++index) {
MSSymbolData &item(items[index]);
item.name_ = names[index];
item.type_ = 0;
item.sect_ = 0;
item.desc_ = 0;
item.value_ = 0;
}
if (image != NULL)
MSMachONameList_(image, items, count);
else {
size_t remain(count);
for (uint32_t image(0), images(_dyld_image_count()); image != images; ++image) {
//fprintf(stderr, ":: %s\n", _dyld_get_image_name(image));
ssize_t result(MSMachONameList_(_dyld_get_image_header(image), items, count));
if (result == -1)
continue;
// XXX: maybe avoid this happening at all? a flag to NSMachONameList_?
for (size_t index(0); index != count; ++index) {
MSSymbolData &item(items[index]);
if (item.name_ == NULL && item.value_ == 0) {
++result;
item.name_ = names[index];
}
}
remain -= count - result;
if (remain == 0)
break;
}
}
for (size_t index(0); index != count; ++index) {
MSSymbolData &item(items[index]);
uintptr_t value(item.value_);
#ifdef __arm__
if ((item.desc_ & N_ARM_THUMB_DEF) != 0)
value |= 0x00000001;
#endif
values[index] = reinterpret_cast<void *>(value);
}
}
_extern void *MSFindSymbol(MSImageRef image, const char *name) {
void *value;
MSFindSymbols(image, 1, &name, &value);
return value;
}
#ifdef __arm__
MSHook(int, nlist, const char *file, struct nlist *names) {
const void *image(MSGetImageByName(file));
if (image == NULL)
return (*_nlist)(file, names);
size_t count(0);
for (struct nlist *list(names); list->n_un.n_name != NULL; ++list)
++count;
MSSymbolData items[count];
for (size_t index(0); index != count; ++index) {
MSSymbolData &item(items[index]);
struct nlist &name(names[index]);
item.name_ = name.n_un.n_name;
item.type_ = 0;
item.sect_ = 0;
item.desc_ = 0;
item.value_ = 0;
}
int result(MSMachONameList_(image, items, count));
for (size_t index(0); index != count; ++index) {
MSSymbolData &item(items[index]);
struct nlist &name(names[index]);
name.n_type = item.type_;
name.n_sect = item.sect_;
name.n_desc = item.desc_;
name.n_value = item.value_;
}
return result;
}
MSInitialize {
MSHookFunction(&nlist, MSHake(nlist));
}
#endif
You can’t perform that action at this time.