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5ec1cff
2023-11-03 11:41:28 +08:00
parent f78c217552
commit f5e0a418c9
18 changed files with 314 additions and 55 deletions
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48
loader/src/ptracer/ptracer.cpp
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@@ -152,49 +152,65 @@ bool inject_on_main(int pid, const char *lib_path) {
#define STOPPED_WITH(sig, event) (WIFSTOPPED(status) && WSTOPSIG(status) == (sig) && (status >> 16) == (event))
void trace_zygote_main(int pid) {
bool trace_zygote(int pid) {
#define WAIT_OR_DIE if (wait_pid(pid, &status, __WALL) != pid) return false;
#define CONT_OR_DIE \
if (ptrace(PTRACE_CONT, pid, 0, 0) == -1) { \
PLOGE("cont"); \
return false; \
}
int status;
LOGI("tracing %d (tracer %d)", pid, getpid());
if (ptrace(PTRACE_SEIZE, pid, 0, PTRACE_O_TRACEEXEC) == -1) {
PLOGE("seize");
return;
return false;
}
wait_pid(pid, &status, __WALL);
struct finally {
int pid;
~finally() {
ptrace(PTRACE_DETACH, pid, 0, 0);
}
} _{pid};
WAIT_OR_DIE
if (STOPPED_WITH(SIGSTOP, PTRACE_EVENT_STOP)) {
// if SIGSTOP is delivered before we seized it
LOGD("process is already stopped");
kill(pid, SIGCONT);
ptrace(PTRACE_CONT, pid, 0, 0);
wait_pid(pid, &status, __WALL);
if (kill(pid, SIGCONT)) {
PLOGE("kill");
return false;
}
CONT_OR_DIE
WAIT_OR_DIE
if (STOPPED_WITH(SIGTRAP, PTRACE_EVENT_STOP)) {
ptrace(PTRACE_CONT, pid, 0, 0);
wait_pid(pid, &status, __WALL);
CONT_OR_DIE
WAIT_OR_DIE
if (STOPPED_WITH(SIGCONT, 0)) {
LOGD("received SIGCONT");
ptrace(PTRACE_CONT, pid, 0, 0);
}
} else {
LOGE("unknown state %s, not SIGTRAP + EVENT_STOP", parse_status(status).c_str());
return false;
}
} else if (STOPPED_WITH(SIGSTOP, 0)) {
// if SIGSTOP is delivered after we seized it
LOGD("process received SIGSTOP, suppress");
ptrace(PTRACE_CONT, pid, 0, 0);
CONT_OR_DIE
} else {
LOGE("unknown state %s, neither EVENT_STOP nor SIGSTOP", parse_status(status).c_str());
exit(1);
return false;
}
wait_pid(pid, &status, __WALL);
WAIT_OR_DIE
// enter the app_process
if (STOPPED_WITH(SIGTRAP, PTRACE_EVENT_EXEC)) {
LOGD("app_process exec-ed");
LOGI("app_process exec-ed");
if (!inject_on_main(pid, "/dev/zygisk/lib" LP_SELECT("", "64") "/libzygisk.so")) {
LOGE("failed to inject");
exit(1);
return false;
}
} else {
LOGE("unknown status %d", status);
exit(1);
LOGE("unknown status %s", parse_status(status).c_str());
return false;
}
ptrace(PTRACE_DETACH, pid, 0, 0);
return true;
}