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Move first stage unload into second stage

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topjohnwu 2021-09-22 19:33:08 -07:00
parent 12647dcf30
commit 05c4ad01d5
1 changed files with 18 additions and 19 deletions
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37
native/jni/zygisk/entry.cpp
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@ -72,7 +72,7 @@ static void zygisk_cleanup_wait() {
#define SECOND_STAGE_PTR "ZYGISK_PTR"
static decltype(&unload_first_stage) second_stage_entry(void *handle) {
static void second_stage_entry(void *handle, char *path) {
self_handle = handle;
unsetenv(INJECT_ENV_2);
unsetenv(SECOND_STAGE_PTR);
@ -80,7 +80,22 @@ static decltype(&unload_first_stage) second_stage_entry(void *handle) {
zygisk_logging();
LOGD("zygisk: inject 2nd stage\n");
hook_functions();
return &unload_first_stage;
// Register signal handler to unload 1st stage
struct sigaction action{};
action.sa_sigaction = unload_first_stage;
sigaction(SIGUSR1, &action, nullptr);
// Schedule to unload 1st stage 10us later
timer_t timer;
sigevent_t event{};
event.sigev_notify = SIGEV_SIGNAL;
event.sigev_signo = SIGUSR1;
event.sigev_value.sival_ptr = path;
timer_create(CLOCK_MONOTONIC, &event, &timer);
itimerspec time{};
time.it_value.tv_nsec = 10000L;
timer_settime(&timer, 0, &time, nullptr);
}
static void first_stage_entry() {
@ -115,23 +130,7 @@ static void first_stage_entry() {
char *env = getenv(SECOND_STAGE_PTR);
decltype(&second_stage_entry) second_stage;
sscanf(env, "%p", &second_stage);
auto unload_handler = second_stage(handle);
// Register signal handler to unload 1st stage
struct sigaction action{};
action.sa_sigaction = unload_handler;
sigaction(SIGUSR1, &action, nullptr);
// Schedule to unload 1st stage 10us later
timer_t timer;
sigevent_t event{};
event.sigev_notify = SIGEV_SIGNAL;
event.sigev_signo = SIGUSR1;
event.sigev_value.sival_ptr = path;
timer_create(CLOCK_MONOTONIC, &event, &timer);
itimerspec time{};
time.it_value.tv_nsec = 10000L;
timer_settime(&timer, 0, &time, nullptr);
second_stage(handle, path);
}
__attribute__((constructor))