Help! void

Viktorovich31 · Nov 23, 2022

Please tell me, am I calling the "LocalStore" class correctly, in which I need to change the field "int _coinCount; // 0x3C"?

Code:

void* LocalStore;

void (*old_update)(void* instance);
void update(void* instance){
    if(instance != NULL && LocalStore != NULL){
      *(int *)((uint64_t)LocalStore + 0x3C) = 999;
     }
     old_update(instance);
}

__attribute__((constructor))
void libhook_main() {
    do {
        sleep(1);
    } while (!isLibraryLoaded(OBFUSCATE("libil2cpp.so")));
    LOGI(OBFUSCATE("lib loaded"));
    HOOK_LIB("libil2cpp.so", "0x9A1F34", update, old_update);
    LOGI(OBFUSCATE("lib hooked"));
}

HekaHeka709 · Nov 24, 2022

No, LocalStore is NULL because it's not initialized. I suppose that you're trying to hook field in LocalStore through Update function outside the LocalStore class.
To fix your hook initialize LocalStore before hooking the field

void *LocalStore; //DECLARING A GLOBAL VARIABLE

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL) //CHECK IF INSTANCE IS NOT NULL
{
LocalStore = *(void **) ((uint64_t)instance + (LOCALSTORE OFFSET)); //INITIAZLIZING LOCALSTORE
if (LocalStore == NULL) return; //REMOVE USELESS THINGS
//THIS IS WHERE YOU CAN HOOK THE FIELD
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
}
old_update(instance);
}

Viktorovich31 · Nov 24, 2022

HekaHeka709 said:
No, LocalStore is NULL because it's not initialized. I suppose that you're trying to hook field in LocalStore through Update function outside the LocalStore class.
To fix your hook initialize LocalStore before hooking the field

void *LocalStore; //DECLARING A GLOBAL VARIABLE

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL) //CHECK IF INSTANCE IS NOT NULL
{
LocalStore = *(void **) ((uint64_t)instance + (LOCALSTORE OFFSET)); //INITIAZLIZING LOCALSTORE
if (LocalStore == NULL) return; //REMOVE USELESS THINGS
//THIS IS WHERE YOU CAN HOOK THE FIELD
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
}
old_update(instance);
}

Thanks, I will try! Another question is how to correctly find the required update method if it is not in the class?

Viktorovich31 · Nov 24, 2022

HekaHeka709 said:
Нет, LocalStore имеет значение NULL, потому что оно не инициализировано. Я предполагаю, что вы пытаетесь перехватить поле в LocalStore через функцию Update вне класса LocalStore.
Чтобы исправить ваш хук, инициализируйте LocalStore перед подключением поля.

недействительным *LocalStore; // ОБЪЯВЛЕНИЕ ГЛОБАЛЬНОЙ ПЕРЕМЕННОЙ

void (*old_update)(void *instance);
недействительное обновление (недействительное * экземпляр) {
if (instance != NULL) // ПРОВЕРЯЕМ, ЕСЛИ ЭКЗЕМПЛЯР НЕ NULL
{
LocalStore = *(void **) ((uint64_t)экземпляр + (LOCALSTORE OFFSET)); // ИНИЦИАЛИЗАЦИЯ LOCALSTORE
если (LocalStore == NULL) вернуть; //УДАЛЯЕМ БЕСПОЛЕЗНЫЕ ВЕЩИ
// ЗДЕСЬ ВЫ МОЖЕТЕ ПРИСОЕДИНИТЬСЯ К ПОЛЕ
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("ПОЛЕ ПОДКЛЮЧЕНО");
}
old_update (экземпляр);
}
[/ЦИТИРОВАТЬ]

HekaHeka709 said:

No, LocalStore is NULL because it's not initialized. I suppose that you're trying to hook field in LocalStore through Update function outside the LocalStore class.
To fix your hook initialize LocalStore before hooking the field

void *LocalStore; //DECLARING A GLOBAL VARIABLE

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL) //CHECK IF INSTANCE IS NOT NULL
{
LocalStore = *(void **) ((uint64_t)instance + (LOCALSTORE OFFSET)); //INITIAZLIZING LOCALSTORE
if (LocalStore == NULL) return; //REMOVE USELESS THINGS
//THIS IS WHERE YOU CAN HOOK THE FIELD
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
}
old_update(instance);
}

Click to expand...

HekaHeka709 said:
No, LocalStore is NULL because it's not initialized. I suppose that you're trying to hook field in LocalStore through Update function outside the LocalStore class.
To fix your hook initialize LocalStore before hooking the field

void *LocalStore; //DECLARING A GLOBAL VARIABLE

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL) //CHECK IF INSTANCE IS NOT NULL
{
LocalStore = *(void **) ((uint64_t)instance + (LOCALSTORE OFFSET)); //INITIAZLIZING LOCALSTORE
if (LocalStore == NULL) return; //REMOVE USELESS THINGS
//THIS IS WHERE YOU CAN HOOK THE FIELD
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
}
old_update(instance);
}

Please look, did I do it right?

HekaHeka709 said:
No, LocalStore is NULL because it's not initialized. I suppose that you're trying to hook field in LocalStore through Update function outside the LocalStore class.
To fix your hook initialize LocalStore before hooking the field

void *LocalStore; //DECLARING A GLOBAL VARIABLE

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL) //CHECK IF INSTANCE IS NOT NULL
{
LocalStore = *(void **) ((uint64_t)instance + (LOCALSTORE OFFSET)); //INITIAZLIZING LOCALSTORE
if (LocalStore == NULL) return; //REMOVE USELESS THINGS
//THIS IS WHERE YOU CAN HOOK THE FIELD
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
}
old_update(instance);
}

void *LocalStore;

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL)
{
LocalStore = *(void **) ((uint64_t)instance + (0x3C));
if (LocalStore == NULL) return;
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
}
old_update(instance);
}
Please look, did I do it right?

HekaHeka709 said:
No, LocalStore is NULL because it's not initialized. I suppose that you're trying to hook field in LocalStore through Update function outside the LocalStore class.
To fix your hook initialize LocalStore before hooking the field

void *LocalStore; //DECLARING A GLOBAL VARIABLE

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL) //CHECK IF INSTANCE IS NOT NULL
{
LocalStore = *(void **) ((uint64_t)instance + (LOCALSTORE OFFSET)); //INITIAZLIZING LOCALSTORE
if (LocalStore == NULL) return; //REMOVE USELESS THINGS
//THIS IS WHERE YOU CAN HOOK THE FIELD
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
}
old_update(instance);
}

void *LocalStore;

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL)
{
LocalStore = *(void **) ((uint64_t)instance + (0x3C));
if (LocalStore == NULL) return;
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
}
old_update(instance);
}
Please look, did I do it right?

Smiley3rd · Dec 16, 2022

Viktorovich31 said:
Please look, did I do it right?

void *LocalStore;

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL)
{
LocalStore = *(void **) ((uint64_t)instance + (0x3C));
if (LocalStore == NULL) return;
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
}
old_update(instance);
}
Please look, did I do it right?

No, remove the brackets like this

LocalStore = *(void **) ((uint64_t)instance + 0x3C);

Viktorovich31 · Dec 17, 2022

Smikey3rd said:
No, remove the brackets like this

LocalStore = *(void **) ((uint64_t)instance + 0x3C);

Thank you! But it doesn't work in both cases.

Smiley3rd · Dec 18, 2022

Viktorovich31 said:
Thank you! But it doesn't work in both cases.

When you said it dosen't work, could you be more specific?
It doesn't work when building or the hook doesn't work?

If the hook doesn't work, try to check if 'LocalStore' is null

what it should look like:

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL)
{
LocalStore = *(void **) ((uint64_t)instance + 0x3C);
if (LocalStore != NULL)
{
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
old_update(instance);
}
}
old_update(instance);
}

Viktorovich31 · Dec 19, 2022

Smikey3rd said:
When you said it dosen't work, could you be more specific?
It doesn't work when building or the hook doesn't work?

If the hook doesn't work, try to check if 'LocalStore' is null

what it should look like:

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL)
{
LocalStore = *(void **) ((uint64_t)instance + 0x3C);
if (LocalStore != NULL)
{
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
old_update(instance);
}
}
old_update(instance);
}

Thank you!

Viktorovich31 · Dec 26, 2022

Hello! Please help, I'm completely confused. Did I do right? The hook doesn't work! And how to correctly find the update method in the dump? I used any, probably it's not correct.

Viktorovich31 · Dec 26, 2022

Smikey3rd said:
When you said it dosen't work, could you be more specific?
It doesn't work when building or the hook doesn't work?

If the hook doesn't work, try to check if 'LocalStore' is null

what it should look like:

void (*old_update)(void *instance);
void update(void *instance) {
if (instance != NULL)
{
LocalStore = *(void **) ((uint64_t)instance + 0x3C);
if (LocalStore != NULL)
{
*(int *) ((uint64_t) LocalStore + 0x3C) = 999;
LOGD("FIELD HOOKED");
old_update(instance);
}
}
old_update(instance);
}

Hello! Please help, I'm completely confused. Did I do right? The hook doesn't work! And how to correctly find the update method in the dump? I used any, probably it's not correct.

Smiley3rd · Dec 27, 2022

Viktorovich31 said:
Hello! Please help, I'm completely confused. Did I do right? The hook doesn't work! And how to correctly find the update method in the dump? I used any, probably it's not correct.

I don't know why it still doesn't work but maybe because of how you hooked the field? try to set to true or false not number

Viktorovich31 · Dec 27, 2022

Smikey3rd said:
I don't know why it still doesn't work but maybe because of how you hooked the field? try to set to true or false not number

Thank you. I do not know what to do.

Raebydett · Dec 27, 2022

It didnt work bcs u using wrong update method, also theres no instance on that class pointing to class usersavedata

void* UserSaveData = *(void **) ((uint64_t) instance + 0x9); <--- your offset doesnt point to anything

Viktorovich31 · Dec 27, 2022

Help me please! How to do it right?

Viktorovich31 · Dec 27, 2022

Raebydett said:
It didnt work bcs u using wrong update method, also theres no instance on that class pointing to class usersavedata

void* UserSaveData = *(void **) ((uint64_t) instance + 0x9); <--- your offset doesnt point to anything

Help me please! How to do it right?

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