104 lines
4.0 KiB
Python
104 lines
4.0 KiB
Python
#! /usr/bin/python3 -sP
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# SPDX-License-Identifier: GPL-2.0
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# -*- coding: utf-8 -*-
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#
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# Copyright (c) 2021 Benjamin Tissoires <benjamin.tissoires@gmail.com>
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# Copyright (c) 2021 Red Hat, Inc.
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#
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# This is to ensure we don't crash when emulating USB devices
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from . import base
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import pytest
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import logging
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logger = logging.getLogger("hidtools.test.usb")
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class USBDev(base.UHIDTestDevice):
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# fmt: off
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report_descriptor = [
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0x05, 0x01, # .Usage Page (Generic Desktop) 0
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0x09, 0x02, # .Usage (Mouse) 2
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0xa1, 0x01, # .Collection (Application) 4
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0x09, 0x02, # ..Usage (Mouse) 6
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0xa1, 0x02, # ..Collection (Logical) 8
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0x09, 0x01, # ...Usage (Pointer) 10
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0xa1, 0x00, # ...Collection (Physical) 12
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0x05, 0x09, # ....Usage Page (Button) 14
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0x19, 0x01, # ....Usage Minimum (1) 16
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0x29, 0x03, # ....Usage Maximum (3) 18
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0x15, 0x00, # ....Logical Minimum (0) 20
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0x25, 0x01, # ....Logical Maximum (1) 22
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0x75, 0x01, # ....Report Size (1) 24
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0x95, 0x03, # ....Report Count (3) 26
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0x81, 0x02, # ....Input (Data,Var,Abs) 28
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0x75, 0x05, # ....Report Size (5) 30
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0x95, 0x01, # ....Report Count (1) 32
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0x81, 0x03, # ....Input (Cnst,Var,Abs) 34
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0x05, 0x01, # ....Usage Page (Generic Desktop) 36
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0x09, 0x30, # ....Usage (X) 38
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0x09, 0x31, # ....Usage (Y) 40
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0x15, 0x81, # ....Logical Minimum (-127) 42
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0x25, 0x7f, # ....Logical Maximum (127) 44
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0x75, 0x08, # ....Report Size (8) 46
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0x95, 0x02, # ....Report Count (2) 48
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0x81, 0x06, # ....Input (Data,Var,Rel) 50
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0xc0, # ...End Collection 52
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0xc0, # ..End Collection 53
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0xc0, # .End Collection 54
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]
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# fmt: on
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def __init__(self, name=None, input_info=None):
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super().__init__(
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name, "Mouse", input_info=input_info, rdesc=USBDev.report_descriptor
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)
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# skip witing for udev events, it's likely that the report
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# descriptor is wrong
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def is_ready(self):
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return True
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# we don't have an evdev node here, so paper over
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# the checks
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def get_evdev(self, application=None):
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return "OK"
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class TestUSBDevice(base.BaseTestCase.TestUhid):
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"""
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Test class to test if an emulated USB device crashes
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the kernel.
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"""
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# conftest.py is generating the following fixture:
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#
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# @pytest.fixture(params=[('modulename', 1, 2)])
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# def usbVidPid(self, request):
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# return request.param
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@pytest.fixture()
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def new_uhdev(self, usbVidPid, request):
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self.module, self.vid, self.pid = usbVidPid
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self._load_kernel_module(None, self.module)
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return USBDev(input_info=(3, self.vid, self.pid))
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def test_creation(self):
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"""
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inject the USB dev through uhid and immediately see if there is a crash:
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uhid can create a USB device with the BUS_USB bus, and some
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drivers assume that they can then access USB related structures
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when they are actually provided a uhid device. This leads to
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a crash because those access result in a segmentation fault.
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The kernel should not crash on any (random) user space correct
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use of its API. So run through all available modules and declared
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devices to see if we can generate a uhid device without a crash.
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The test is empty as the fixture `check_taint` is doing the job (and
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honestly, when the kernel crashes, the whole machine freezes).
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"""
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assert True
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