Practicum Status Update Week 5

Sorry for that video being so poorly embedded in this wordpress instance. You might want to try to download the video directly.

So yeah, we can potentially filter USB packets by now, which allows us in-place fuzzing. But that’s cumbersome because we need to have a device attached to the host. So the goal must be to be able to do USB communication without a device being attached to the host but with a program that emulates the USB device in question.

    int interface = atoi(argv[1]);
    fd = open("/dev/bus/usb/002/006", O_RDWR);
    result = ioctl(fd, USBDEVFS_RELEASEINTERFACE, &interface);
    //result = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &interface);
    printf("Result: %d, errno: %d %s\n", result, errno, strerror(errno));

and fails with Invalid Argument for RELEASE or for CLAIM with -EINVAL (Invalid Argument) or -ENOENT (No such file or directory). I have no idea what I am doing wrong. So if you do, please tell me 😛
Oh, and these ioctls are not exported to Python I think. At least I couldn’t find the correct ioctl number for USBDEVFS_CLAIMINTERFACE without progamming a tiny C program to print it out for me.