Function uninstall_java_hook

src/agent/hook/java.c:2032–2093

}

int uninstall_java_hook(int hook_index) {
    if (hook_index < 0 || hook_index >= g_java_hook_count) {
        LOGE("Invalid hook index: %d", hook_index);
        return -1;
    }

    pthread_mutex_lock(&g_java_hook_mutex);

    JavaHookInfo* hook = &g_java_hooks[hook_index];

    if (!hook->is_hooked) {
        LOGI("Hook %d already uninstalled", hook_index);
        pthread_mutex_unlock(&g_java_hook_mutex);
        return 0;
    }

    const ArtMethodOffsets* offsets = get_art_method_offsets();
    void** entry_point_ptr = (void**)((uintptr_t)hook->art_method + offsets->entry_point_offset);

    void* page = (void*)((uintptr_t)entry_point_ptr & ~(PAGE_SIZE - 1));
    if (mprotect(page, PAGE_SIZE, PROT_READ | PROT_WRITE) != 0) {
        LOGE("Failed to change page protection for unhook: %s", strerror(errno));
        pthread_mutex_unlock(&g_java_hook_mutex);
        return -1;
    }

    if (hook->was_nativized) {
        uint32_t* access_flags_ptr = (uint32_t*)((uintptr_t)hook->art_method + offsets->access_flags_offset);
        LOGI("Restoring original access_flags: 0x%x", hook->original_access_flags);
        *access_flags_ptr = hook->original_access_flags;
        __builtin___clear_cache((char*)access_flags_ptr, (char*)access_flags_ptr + 4);
    }

    *entry_point_ptr = hook->original_entry_point;
    __builtin___clear_cache((char*)entry_point_ptr, (char*)entry_point_ptr + 8);

    if (hook->hook_trampoline) {
        munmap(hook->hook_trampoline, PAGE_SIZE);
        hook->hook_trampoline = NULL;
    }

    if (g_lua_engine) {
        lua_State* L = lua_engine_get_state(g_lua_engine);
        if (L) {
            if (hook->lua_onEnter_ref != LUA_NOREF) {
                luaL_unref(L, LUA_REGISTRYINDEX, hook->lua_onEnter_ref);
            }
            if (hook->lua_onLeave_ref != LUA_NOREF) {
                luaL_unref(L, LUA_REGISTRYINDEX, hook->lua_onLeave_ref);
            }
        }
    }

    hook->lua_onEnter_ref = LUA_NOREF;
    hook->lua_onLeave_ref = LUA_NOREF;
    hook->is_hooked = false;

    pthread_mutex_unlock(&g_java_hook_mutex);