Display UIDebuggingInformationOverlay on iOS 11 without swizzling

overlaydbg

+ (void)load {

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{

        int imageCount = _dyld_image_count();
        const struct mach_header* UIKitHeader = nil;
        for (int i = 0; i < imageCount; i++) {
            if (strcmp(basename((char *)_dyld_get_image_name(i)), "UIKit") == 0) {
                UIKitHeader = _dyld_get_image_header(i);
                break;
            }
        }
        
        if (!UIKitHeader) {
            return;
        }
        
        unsigned long size =0;
        uintptr_t * ptr = (uintptr_t *)getsectiondata((const struct mach_header_64 *)UIKitHeader, "__DATA", "__bss", &size);
        for (int i = 0; i < size / sizeof(uintptr_t); i++) {
            Dl_info  info;
            dladdr(&ptr[i], &info);

            if (strcmp("__hasCachedDebuggingOverlayEnabled", info.dli_sname) == 0) {
                memset(info.dli_saddr, 255, sizeof(BOOL));
            }
            else if (strcmp("__cachedDebuggingOverlayEnabled", info.dli_sname) == 0) {
                NSLog(@"woot 2");
            }
            else if (strcmp("__UIGetDebuggingOverlayEnabledAssumingInternal.onceToken", info.dli_sname) == 0) {
                memset(info.dli_saddr, 255, sizeof(uintptr_t *));
                void * offset = info.dli_saddr + 8;
                memset(offset, 255, sizeof(uintptr_t *));
                memset(offset, 1, 1);
                
            }
            else if (strcmp("__isInternalDevice", info.dli_sname) == 0) {
                memset(info.dli_saddr, 255, sizeof(uintptr_t *));
            }
            else if (strcmp("UIDebuggingOverlayIsEnabled.onceToken", info.dli_sname) == 0) {
                memset(info.dli_saddr, 255, sizeof(uintptr_t *));
            }
            else if (strcmp("UIDebuggingOverlayIsEnabled.__overlayIsEnabled", info.dli_sname) == 0) {
                memset(info.dli_saddr, 255, sizeof(uintptr_t *));
            }
            else if (strcmp("__fetchedInternalDeviceOnceToken", info.dli_sname) == 0) {
                memset(info.dli_saddr, 255, sizeof(uintptr_t *));
            }
        }
    });
}