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#include <unistd.h>
#include <sys/types.h>
#ifdef __APPLE__
#include <mach/mach.h>
#include <mach-o/dyld_images.h>
#else
#include <sys/wait.h>
#include <sys/personality.h>
#endif
#include "frida-gum.h"
#include "config.h"
#include "debug.h"
#include "interceptor.h"
#include "instrument.h"
#include "prefetch.h"
#include "ranges.h"
#ifdef __APPLE__
extern mach_port_t mach_task_self();
extern GumAddress gum_darwin_find_entrypoint(mach_port_t task);
#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;
static GumStalker * stalker = NULL;
static GumMemoryRange code_range = {0};
extern void __afl_manual_init();
extern __thread uint64_t previous_pc;
static int on_fork() {
prefetch_read(stalker);
return fork();
}
#ifdef __APPLE__
static void on_main_os(int argc, char **argv, char **envp) {
}
#else
static void on_main_os(int argc, char **argv, char **envp) {
/* Personality doesn't affect the current process, it only takes effect on
* evec */
int persona = personality(ADDR_NO_RANDOMIZE);
if ((persona & ADDR_NO_RANDOMIZE) == 0) { execvpe(argv[0], argv, envp); }
GumInterceptor *interceptor = gum_interceptor_obtain();
gum_interceptor_begin_transaction(interceptor);
gum_interceptor_revert(interceptor, __libc_start_main);
gum_interceptor_end_transaction(interceptor);
gum_interceptor_flush(interceptor);
}
#endif
static int *on_main(int argc, char **argv, char **envp) {
on_main_os(argc, argv, envp);
stalker = gum_stalker_new();
if (stalker == NULL) { FATAL("Failed to initialize stalker"); }
gum_stalker_set_trust_threshold(stalker, 0);
GumStalkerTransformer *transformer =
gum_stalker_transformer_make_from_callback(instr_basic_block, NULL, NULL);
instrument_init();
prefetch_init();
ranges_init(stalker);
intercept(fork, on_fork, stalker);
gum_stalker_follow_me(stalker, transformer, NULL);
gum_stalker_deactivate(stalker);
__afl_manual_init();
/* Child here */
previous_pc = 0;
prefetch_start(stalker);
main_fn(argc, argv, envp);
_exit(0);
}
#ifdef __APPLE__
static void intercept_main() {
mach_port_t task = mach_task_self();
OKF("Task Id: %u", task);
GumAddress entry = gum_darwin_find_entrypoint(task);
OKF("Entry Point: 0x%016" G_GINT64_MODIFIER "x", entry);
void *main = GSIZE_TO_POINTER(entry);
main_fn = main;
intercept(main, on_main, 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(main, on_main, NULL);
return __libc_start_main(main, argc, ubp_av, init, fini, rtld_fini,
stack_end);
}
static void intercept_main() {
intercept(__libc_start_main, on_libc_start_main, NULL);
}
#endif
__attribute__((constructor)) static void init() {
gum_init_embedded();
if (!gum_stalker_is_supported()) {
gum_deinit_embedded();
FATAL("Failed to initialize embedded");
}
intercept_main();
}
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