sys/linux: add basic examples of vusb variants

This change is the first step in addressing issue [1].

Despite syzkaller's best efforts, some usb drivers are proving
resistant to attempts to probe them. Specifically, crafted
devices are not accurate enough to bypass checks in probe().
These checks mostly deal with usb interfaces and endpoints.

One way to address this issue is to define syz_connect_* calls
variants to help syzkaller succeed probing by describing in detail
various device attributes.

Start by describing such calls for select drivers, each representing
its own category of sorts. At the moment, code coverage for these
drivers is unimpressive:

- rtl8150
Used to succeed probing until a better usb endpoint check was implemented.

- sierra_net
Same as rtl8150. Depends on usbnet API for bind() and usb ep checks.

- lan78xx
Requires numerous control requests between driver and device DURING probe.
Extra descriptions are helpful but are not enough to fully complete
probing process.

Also, add a seed for each such example.

This is only a stepping stone to improve usb fuzzing results and most
likely will be subject to change in the future.

[1] https://github.com/google/syzkaller/issues/6206

1 files changed, 19 insertions, 0 deletions

diff --git a/sys/linux/vusb.txt.const b/sys/linux/vusb.txt.const
index 5eb8cfe6f..b707e8dc4 100644
--- a/sys/linux/vusb.txt.const
+++ b/sys/linux/vusb.txt.const
@@ -73,6 +73,14 @@ HUB_CHAR_PORTIND = 128
 HUB_CHAR_TTTT = 96
 HUB_STATUS_LOCAL_POWER = 1
 HUB_STATUS_OVERCURRENT = 2
+LAN78XX_REG_TYPE_IN = 192
+LAN78XX_REG_TYPE_OUT = 64
+RTL8150_REQT_READ = 192
+RTL8150_REQT_WRITE = 64
+RTL8150_REQ_GET_REGS = 5
+RTL8150_REQ_SET_REGS = 5
+SIERRA_CMD_TYPE_IN = 161
+SIERRA_CMD_TYPE_OUT = 33
 UAC1_EXTENSION_UNIT = 8
 UAC1_PROCESSING_UNIT = 7
 UAC_AS_GENERAL = 1
@@ -162,6 +170,7 @@ USB_CDC_COUNTRY_TYPE = 7
 USB_CDC_DMM_TYPE = 20
 USB_CDC_ETHERNET_TYPE = 15
 USB_CDC_GET_CRC_MODE = 137
+USB_CDC_GET_ENCAPSULATED_RESPONSE = 1
 USB_CDC_GET_MAX_DATAGRAM_SIZE = 135
 USB_CDC_GET_NTB_FORMAT = 131
 USB_CDC_GET_NTB_INPUT_SIZE = 133
@@ -181,6 +190,7 @@ USB_CDC_NCM_TYPE = 26
 USB_CDC_NETWORK_TERMINAL_TYPE = 10
 USB_CDC_OBEX_TYPE = 21
 USB_CDC_PROTO_NONE = 0
+USB_CDC_SEND_ENCAPSULATED_COMMAND = 0
 USB_CDC_SUBCLASS_ETHERNET = 6
 USB_CDC_SUBCLASS_NCM = 13
 USB_CDC_UNION_TYPE = 6
@@ -235,6 +245,7 @@ USB_ENDPOINT_ATH9K_BULK_OUT_ADDRESS = 1
 USB_ENDPOINT_ATH9K_INT_ATTRIBUTES = 3
 USB_ENDPOINT_ATH9K_INT_IN_ADDRESS = 131
 USB_ENDPOINT_ATH9K_INT_OUT_ADDRESS = 4
+USB_ENDPOINT_BULK_ATTR = 2
 USB_ENDPOINT_CDC_ECM_DATA_ATTRIBUTES = 2
 USB_ENDPOINT_CDC_ECM_IN_ADDRESS = 130
 USB_ENDPOINT_CDC_ECM_NOTIFY_ADDRESS = 129
@@ -245,6 +256,7 @@ USB_ENDPOINT_HID_IN_ADDRESS = 129
 USB_ENDPOINT_HID_OUT_ADDRESS = 2
 USB_ENDPOINT_INTR_NOTIFICATION = 16
 USB_ENDPOINT_INTR_PERIODIC = 0
+USB_ENDPOINT_INT_ATTR = 3
 USB_ENDPOINT_PRINTER_ATTRIBUTES = 2
 USB_ENDPOINT_PRINTER_IN_ADDRESS = 130
 USB_ENDPOINT_PRINTER_OUT_ADDRESS = 1
@@ -265,6 +277,9 @@ USB_EXT_PORT_STAT_RX_LANES = 3840
 USB_EXT_PORT_STAT_RX_SPEED_ID = 15
 USB_EXT_PORT_STAT_TX_LANES = 61440
 USB_EXT_PORT_STAT_TX_SPEED_ID = 240
+USB_FIXED_ENDPOINT_BULK_IN_ADDR = 129
+USB_FIXED_ENDPOINT_BULK_OUT_ADDR = 2
+USB_FIXED_ENDPOINT_INT_IN_ADDR = 131
 USB_FULL_SPEED_OPERATION = 2
 USB_HIGH_SPEED_OPERATION = 4
 USB_HUB_PORTS_BITS = 4
@@ -297,6 +312,7 @@ USB_PORT_STAT_SPEED_5GBPS = 0
 USB_PORT_STAT_SUSPEND = 4
 USB_PORT_STAT_TEST = 2048
 USB_PTM_CAP_TYPE = 11
+USB_RECIP_DEVICE = 0
 USB_REQ_CLEAR_FEATURE = 1
 USB_REQ_GET_BATTERY_STATUS = 21
 USB_REQ_GET_CONFIGURATION = 8
@@ -366,6 +382,9 @@ USB_SUBCLASS_VENDOR_SPEC = 255
 USB_TYPE_CLASS = 32
 USB_TYPE_STANDARD = 0
 USB_TYPE_VENDOR = 64
+USB_VENDOR_REQUEST_GET_STATS = 162
+USB_VENDOR_REQUEST_READ_REGISTER = 161
+USB_VENDOR_REQUEST_WRITE_REGISTER = 160
 USB_WIRELESS_BEACON_DIRECTED = 8
 USB_WIRELESS_BEACON_MASK = 12
 USB_WIRELESS_BEACON_NONE = 12