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
|
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#ifdef __APPLE__
#include <mach/mach.h>
#include <mach-o/dyld_images.h>
#include <crt_externs.h>
#else
#include <sys/wait.h>
#include <sys/personality.h>
#endif
#include "frida-gumjs.h"
#include "config.h"
#include "entry.h"
#include "instrument.h"
#include "intercept.h"
#include "js.h"
#include "lib.h"
#include "module.h"
#include "output.h"
#include "persistent.h"
#include "prefetch.h"
#include "ranges.h"
#include "seccomp.h"
#include "stalker.h"
#include "stats.h"
#include "util.h"
#define PROC_MAX 65536
#ifdef __APPLE__
extern mach_port_t mach_task_self();
extern GumAddress gum_darwin_find_entrypoint(mach_port_t task);
#elif defined(__ANDROID__)
typedef struct {
void (**preinit_array)(void);
void (**init_array)(void);
void (**fini_array)(void);
} structors_array_t;
extern void __libc_init(void *raw_args, void (*onexit)(void) __unused,
int (*slingshot)(int, char **, char **),
structors_array_t const *const structors);
#else
extern int __libc_start_main(int (*main)(int, char **, char **), int argc,
char **ubp_av, void (*init)(void),
void (*fini)(void), void (*rtld_fini)(void),
void(*stack_end));
#endif
typedef int (*main_fn_t)(int argc, char **argv, char **envp);
static main_fn_t main_fn = NULL;
#ifdef __APPLE__
static void on_main_os(int argc, char **argv, char **envp) {
UNUSED_PARAMETER(argc);
UNUSED_PARAMETER(argv);
UNUSED_PARAMETER(envp);
}
#else
static void on_main_os(int argc, char **argv, char **envp) {
UNUSED_PARAMETER(argc);
/* Personality doesn't affect the current process, it only takes effect on
* evec */
int persona = personality(ADDR_NO_RANDOMIZE);
if (persona == -1) { FWARNF("Failed to set ADDR_NO_RANDOMIZE: %d", errno); }
if ((persona & ADDR_NO_RANDOMIZE) == 0) { execvpe(argv[0], argv, envp); }
GumInterceptor *interceptor = gum_interceptor_obtain();
gum_interceptor_begin_transaction(interceptor);
#if defined(__ANDROID__)
gum_interceptor_revert(interceptor, __libc_init);
#else
gum_interceptor_revert(interceptor, __libc_start_main);
#endif
gum_interceptor_end_transaction(interceptor);
gum_interceptor_flush(interceptor);
}
#endif
static void embedded_init(void) {
static gboolean initialized = false;
if (!initialized) {
gum_init_embedded();
initialized = true;
}
}
static void afl_print_cmdline(void) {
#if defined(__linux__)
char *buffer = g_malloc0(PROC_MAX);
gchar *fname = g_strdup_printf("/proc/%d/cmdline", getppid());
int fd = open(fname, O_RDONLY);
if (fd < 0) {
FWARNF("Failed to open /proc/self/cmdline, errno: (%d)", errno);
return;
}
ssize_t bytes_read = read(fd, buffer, PROC_MAX - 1);
if (bytes_read < 0) {
FFATAL("Failed to read /proc/self/cmdline, errno: (%d)", errno);
}
int idx = 0;
FVERBOSE("Command Line");
for (ssize_t i = 0; i < bytes_read; i++) {
if (i == 0 || buffer[i - 1] == '\0') {
FVERBOSE("\targv[%d] = %s", idx++, &buffer[i]);
}
}
close(fd);
g_free(fname);
g_free(buffer);
#elif defined(__APPLE__)
int idx;
char **argv = *_NSGetArgv();
int nargv = *_NSGetArgc();
for (idx = 0; idx < nargv; idx++) {
FVERBOSE("\targv[%d] = %s", idx, argv[idx]);
}
#endif
}
static void afl_print_env(void) {
char *buffer = g_malloc0(PROC_MAX);
gchar *fname = g_strdup_printf("/proc/%d/environ", getppid());
int fd = open(fname, O_RDONLY);
if (fd < 0) {
FWARNF("Failed to open /proc/self/cmdline, errno: (%d)", errno);
return;
}
ssize_t bytes_read = read(fd, buffer, PROC_MAX - 1);
if (bytes_read < 0) {
FFATAL("Failed to read /proc/self/cmdline, errno: (%d)", errno);
}
int idx = 0;
FVERBOSE("ENVIRONMENT");
for (ssize_t i = 0; i < bytes_read; i++) {
if (i == 0 || buffer[i - 1] == '\0') {
FVERBOSE("\t%3d: %s", idx++, &buffer[i]);
}
}
close(fd);
g_free(fname);
g_free(buffer);
}
__attribute__((visibility("default"))) void afl_frida_start(void) {
FOKF(cRED "**********************");
FOKF(cRED "* " cYEL "******************" cRED " *");
FOKF(cRED "* " cYEL "* " cGRN "**************" cYEL " *" cRED " *");
FOKF(cRED "* " cYEL "* " cGRN "* FRIDA MODE *" cYEL " *" cRED " *");
FOKF(cRED "* " cYEL "* " cGRN "**************" cYEL " *" cRED " *");
FOKF(cRED "* " cYEL "******************" cRED " *");
FOKF(cRED "**********************");
afl_print_cmdline();
afl_print_env();
/* Configure */
entry_config();
instrument_config();
js_config();
lib_config();
module_config();
output_config();
persistent_config();
prefetch_config();
ranges_config();
seccomp_config();
stalker_config();
stats_config();
js_start();
/* Initialize */
output_init();
embedded_init();
entry_init();
instrument_init();
lib_init();
module_init();
persistent_init();
prefetch_init();
seccomp_init();
stalker_init();
ranges_init();
stats_init();
/* Start */
stalker_start();
entry_start();
}
static int on_main(int argc, char **argv, char **envp) {
int ret;
on_main_os(argc, argv, envp);
intercept_unhook_self();
afl_frida_start();
if (js_main_hook != NULL) {
ret = js_main_hook(argc, argv, envp);
} else {
ret = main_fn(argc, argv, envp);
}
return ret;
}
#if defined(EMBEDDED)
extern int main(int argc, char **argv, char **envp);
static void intercept_main(void) {
main_fn = main;
intercept_hook(main, on_main, NULL);
}
#elif defined(__APPLE__)
static void intercept_main(void) {
mach_port_t task = mach_task_self();
FVERBOSE("Task Id: %u", task);
GumAddress entry = gum_darwin_find_entrypoint(task);
FVERBOSE("Entry Point: 0x%016" G_GINT64_MODIFIER "x", entry);
void *main = GSIZE_TO_POINTER(entry);
main_fn = main;
intercept_hook(main, on_main, NULL);
}
#elif defined(__ANDROID__)
static void on_libc_init(void *raw_args, void (*onexit)(void) __unused,
int (*slingshot)(int, char **, char **),
structors_array_t const *const structors) {
main_fn = slingshot;
intercept_unhook_self();
intercept_hook(slingshot, on_main, NULL);
return __libc_init(raw_args, onexit, slingshot, structors);
}
static void intercept_main(void) {
intercept_hook(__libc_init, on_libc_init, NULL);
}
#else
static int on_libc_start_main(int (*main)(int, char **, char **), int argc,
char **ubp_av, void (*init)(void),
void (*fini)(void), void (*rtld_fini)(void),
void(*stack_end)) {
main_fn = main;
intercept_unhook_self();
intercept_hook(main, on_main, NULL);
return __libc_start_main(main, argc, ubp_av, init, fini, rtld_fini,
stack_end);
}
static void intercept_main(void) {
intercept_hook(__libc_start_main, on_libc_start_main, NULL);
}
#endif
__attribute__((constructor)) static void init(void) {
embedded_init();
intercept_main();
}
|
