mirror of
https://github.com/reactos/syzkaller.git
synced 2024-11-23 11:29:46 +00:00
821 lines
25 KiB
C
821 lines
25 KiB
C
// Copyright 2020 syzkaller project authors. All rights reserved.
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// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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// This file is shared between executor and csource package.
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// Generic parts of implementation of syz_usb_* pseudo-syscalls.
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#define USB_MAX_IFACE_NUM 4
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#define USB_MAX_EP_NUM 32
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#define USB_MAX_FDS 6
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struct usb_endpoint_index {
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// Copy of the endpoint descriptor:
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struct usb_endpoint_descriptor desc;
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// Raw Gadget endpoint handle used for this endpoint (Linux only):
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int handle;
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};
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struct usb_iface_index {
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// Pointer to where the original interface descriptor is stored:
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struct usb_interface_descriptor* iface;
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// Cached copied of some of the interface attributes:
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uint8 bInterfaceNumber;
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uint8 bAlternateSetting;
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uint8 bInterfaceClass;
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// Endpoint indexes:
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struct usb_endpoint_index eps[USB_MAX_EP_NUM];
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int eps_num;
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};
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struct usb_device_index {
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// Pointer to where the original descriptors are stored:
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struct usb_device_descriptor* dev;
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struct usb_config_descriptor* config;
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// Cached copied of some of the device attributes:
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uint8 bDeviceClass;
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uint8 bMaxPower;
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// Config and interface attributes/indexes:
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int config_length;
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struct usb_iface_index ifaces[USB_MAX_IFACE_NUM];
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int ifaces_num;
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int iface_cur;
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};
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struct usb_info {
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int fd;
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struct usb_device_index index;
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};
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static struct usb_info usb_devices[USB_MAX_FDS];
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static int usb_devices_num;
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static bool parse_usb_descriptor(const char* buffer, size_t length, struct usb_device_index* index)
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{
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if (length < sizeof(*index->dev) + sizeof(*index->config))
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return false;
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memset(index, 0, sizeof(*index));
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index->dev = (struct usb_device_descriptor*)buffer;
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index->config = (struct usb_config_descriptor*)(buffer + sizeof(*index->dev));
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index->bDeviceClass = index->dev->bDeviceClass;
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index->bMaxPower = index->config->bMaxPower;
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index->config_length = length - sizeof(*index->dev);
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index->iface_cur = -1;
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size_t offset = 0;
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while (true) {
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if (offset + 1 >= length)
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break;
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uint8 desc_length = buffer[offset];
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uint8 desc_type = buffer[offset + 1];
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if (desc_length <= 2)
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break;
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if (offset + desc_length > length)
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break;
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if (desc_type == USB_DT_INTERFACE && index->ifaces_num < USB_MAX_IFACE_NUM) {
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struct usb_interface_descriptor* iface = (struct usb_interface_descriptor*)(buffer + offset);
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debug("parse_usb_descriptor: found interface #%u (%d, %d) at %p\n",
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index->ifaces_num, iface->bInterfaceNumber, iface->bAlternateSetting, iface);
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index->ifaces[index->ifaces_num].iface = iface;
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index->ifaces[index->ifaces_num].bInterfaceNumber = iface->bInterfaceNumber;
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index->ifaces[index->ifaces_num].bAlternateSetting = iface->bAlternateSetting;
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index->ifaces[index->ifaces_num].bInterfaceClass = iface->bInterfaceClass;
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index->ifaces_num++;
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}
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if (desc_type == USB_DT_ENDPOINT && index->ifaces_num > 0) {
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struct usb_iface_index* iface = &index->ifaces[index->ifaces_num - 1];
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debug("parse_usb_descriptor: found endpoint #%u at %p\n", iface->eps_num, buffer + offset);
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if (iface->eps_num < USB_MAX_EP_NUM) {
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memcpy(&iface->eps[iface->eps_num].desc, buffer + offset, sizeof(iface->eps[iface->eps_num].desc));
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iface->eps_num++;
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}
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}
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offset += desc_length;
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}
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return true;
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}
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// add_usb_index() and lookup_usb_index() helper functions allow to store and lookup per-device metadata
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// associated with a file descriptor that is used to comminicate with a particular emulated device.
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static struct usb_device_index* add_usb_index(int fd, const char* dev, size_t dev_len)
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{
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int i = __atomic_fetch_add(&usb_devices_num, 1, __ATOMIC_RELAXED);
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if (i >= USB_MAX_FDS)
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return NULL;
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if (!parse_usb_descriptor(dev, dev_len, &usb_devices[i].index))
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return NULL;
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__atomic_store_n(&usb_devices[i].fd, fd, __ATOMIC_RELEASE);
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return &usb_devices[i].index;
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}
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static struct usb_device_index* lookup_usb_index(int fd)
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{
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int i;
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for (i = 0; i < USB_MAX_FDS; i++) {
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if (__atomic_load_n(&usb_devices[i].fd, __ATOMIC_ACQUIRE) == fd) {
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return &usb_devices[i].index;
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}
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}
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return NULL;
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}
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#if USB_DEBUG
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#include <linux/hid.h>
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#include <linux/usb/audio.h>
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#include <linux/usb/cdc.h>
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#include <linux/usb/ch11.h>
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#include <linux/usb/ch9.h>
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// drivers/usb/class/usblp.c
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#define USBLP_REQ_GET_ID 0x00
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#define USBLP_REQ_GET_STATUS 0x01
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#define USBLP_REQ_RESET 0x02
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const char* usb_class_to_string(unsigned value)
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{
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switch (value) {
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case USB_CLASS_PER_INTERFACE:
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return "USB_CLASS_PER_INTERFACE";
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case USB_CLASS_AUDIO:
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return "USB_CLASS_AUDIO";
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case USB_CLASS_COMM:
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return "USB_CLASS_COMM";
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case USB_CLASS_HID:
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return "USB_CLASS_HID";
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case USB_CLASS_PHYSICAL:
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return "USB_CLASS_PHYSICAL";
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case USB_CLASS_STILL_IMAGE:
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return "USB_CLASS_STILL_IMAGE";
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case USB_CLASS_PRINTER:
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return "USB_CLASS_PRINTER";
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case USB_CLASS_MASS_STORAGE:
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return "USB_CLASS_MASS_STORAGE";
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case USB_CLASS_HUB:
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return "USB_CLASS_HUB";
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case USB_CLASS_CDC_DATA:
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return "USB_CLASS_CDC_DATA";
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case USB_CLASS_CSCID:
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return "USB_CLASS_CSCID";
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case USB_CLASS_CONTENT_SEC:
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return "USB_CLASS_CONTENT_SEC";
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case USB_CLASS_VIDEO:
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return "USB_CLASS_VIDEO";
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case USB_CLASS_WIRELESS_CONTROLLER:
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return "USB_CLASS_WIRELESS_CONTROLLER";
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case USB_CLASS_MISC:
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return "USB_CLASS_MISC";
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case USB_CLASS_APP_SPEC:
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return "USB_CLASS_APP_SPEC";
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case USB_CLASS_VENDOR_SPEC:
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return "USB_CLASS_VENDOR_SPEC";
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}
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return "unknown";
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}
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// A helper function that allows to see what kind of device is being emulated.
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// Useful for debugging.
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static void analyze_usb_device(struct usb_device_index* index)
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{
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debug("analyze_usb_device: idVendor = %04x\n", (unsigned)index->dev->idVendor);
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debug("analyze_usb_device: idProduct = %04x\n", (unsigned)index->dev->idProduct);
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debug("analyze_usb_device: bDeviceClass = %x (%s)\n", (unsigned)index->dev->bDeviceClass,
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usb_class_to_string(index->dev->bDeviceClass));
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debug("analyze_usb_device: bDeviceSubClass = %x\n", (unsigned)index->dev->bDeviceSubClass);
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debug("analyze_usb_device: bDeviceProtocol = %x\n", (unsigned)index->dev->bDeviceProtocol);
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for (int i = 0; i < index->ifaces_num; i++) {
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struct usb_interface_descriptor* iface = index->ifaces[i].iface;
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debug("analyze_usb_device: interface #%d:\n", i);
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debug("analyze_usb_device: bInterfaceClass = %x (%s)\n", (unsigned)iface->bInterfaceClass,
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usb_class_to_string(iface->bInterfaceClass));
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debug("analyze_usb_device: bInterfaceSubClass = %x\n", (unsigned)iface->bInterfaceSubClass);
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debug("analyze_usb_device: bInterfaceProtocol = %x\n", (unsigned)iface->bInterfaceProtocol);
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}
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}
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static bool analyze_control_request_standard(struct usb_device_index* index, struct usb_ctrlrequest* ctrl)
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{
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uint8 bDeviceClass = index->bDeviceClass;
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uint8 bInterfaceClass = index->ifaces[index->iface_cur].bInterfaceClass;
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// For some reason HID class GET_DESCRIPTOR requests are STANDARD.
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if (bDeviceClass == USB_CLASS_HID || bInterfaceClass == USB_CLASS_HID) {
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switch (ctrl->bRequest) {
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case USB_REQ_GET_DESCRIPTOR:
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debug("analyze_control_request: req = USB_REQ_GET_DESCRIPTOR\n");
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switch (ctrl->wValue >> 8) {
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case HID_DT_HID:
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debug("analyze_control_request: desc = HID_DT_HID\n");
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return true;
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case HID_DT_REPORT:
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debug("analyze_control_request: desc = HID_DT_REPORT\n");
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return true;
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case HID_DT_PHYSICAL:
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debug("analyze_control_request: desc = HID_DT_PHYSICAL\n");
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return false;
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}
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}
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// Fallthrough to lookup normal STANDARD requests.
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}
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switch (ctrl->bRequest) {
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case USB_REQ_GET_DESCRIPTOR:
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debug("analyze_control_request: req = USB_REQ_GET_DESCRIPTOR\n");
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switch (ctrl->wValue >> 8) {
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case USB_DT_DEVICE:
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debug("analyze_control_request: desc = USB_DT_DEVICE\n");
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return true;
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case USB_DT_CONFIG:
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debug("analyze_control_request: desc = USB_DT_CONFIG, index = %d\n", (int)(ctrl->wValue & 0xff));
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return true;
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case USB_DT_STRING:
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debug("analyze_control_request: desc = USB_DT_STRING\n");
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return true;
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case USB_DT_INTERFACE:
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debug("analyze_control_request: desc = USB_DT_INTERFACE\n");
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break;
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case USB_DT_ENDPOINT:
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debug("analyze_control_request: desc = USB_DT_ENDPOINT\n");
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break;
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case USB_DT_DEVICE_QUALIFIER:
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debug("analyze_control_request: desc = USB_DT_DEVICE_QUALIFIER\n");
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return true;
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case USB_DT_OTHER_SPEED_CONFIG:
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debug("analyze_control_request: desc = USB_DT_OTHER_SPEED_CONFIG\n");
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break;
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case USB_DT_INTERFACE_POWER:
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debug("analyze_control_request: desc = USB_DT_INTERFACE_POWER\n");
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break;
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case USB_DT_OTG:
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debug("analyze_control_request: desc = USB_DT_OTG\n");
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break;
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case USB_DT_DEBUG:
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debug("analyze_control_request: desc = USB_DT_DEBUG\n");
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break;
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case USB_DT_INTERFACE_ASSOCIATION:
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debug("analyze_control_request: desc = USB_DT_INTERFACE_ASSOCIATION\n");
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break;
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case USB_DT_SECURITY:
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debug("analyze_control_request: desc = USB_DT_SECURITY\n");
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break;
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case USB_DT_KEY:
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debug("analyze_control_request: desc = USB_DT_KEY\n");
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break;
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case USB_DT_ENCRYPTION_TYPE:
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debug("analyze_control_request: desc = USB_DT_ENCRYPTION_TYPE\n");
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break;
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case USB_DT_BOS:
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debug("analyze_control_request: desc = USB_DT_BOS\n");
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return true;
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case USB_DT_DEVICE_CAPABILITY:
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debug("analyze_control_request: desc = USB_DT_DEVICE_CAPABILITY\n");
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break;
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case USB_DT_WIRELESS_ENDPOINT_COMP:
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debug("analyze_control_request: desc = USB_DT_WIRELESS_ENDPOINT_COMP\n");
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break;
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case USB_DT_WIRE_ADAPTER:
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debug("analyze_control_request: desc = USB_DT_WIRE_ADAPTER\n");
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break;
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case USB_DT_RPIPE:
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debug("analyze_control_request: desc = USB_DT_RPIPE\n");
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break;
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case USB_DT_CS_RADIO_CONTROL:
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debug("analyze_control_request: desc = USB_DT_CS_RADIO_CONTROL\n");
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break;
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case USB_DT_PIPE_USAGE:
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debug("analyze_control_request: desc = USB_DT_PIPE_USAGE\n");
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break;
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case USB_DT_SS_ENDPOINT_COMP:
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debug("analyze_control_request: desc = USB_DT_SS_ENDPOINT_COMP\n");
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break;
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case USB_DT_SSP_ISOC_ENDPOINT_COMP:
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debug("analyze_control_request: desc = USB_DT_SSP_ISOC_ENDPOINT_COMP\n");
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break;
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default:
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debug("analyze_control_request: desc = unknown = 0x%x\n", (int)(ctrl->wValue >> 8));
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break;
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}
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break;
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case USB_REQ_GET_STATUS:
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debug("analyze_control_request: req = USB_REQ_GET_STATUS\n");
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break;
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case USB_REQ_CLEAR_FEATURE:
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debug("analyze_control_request: req = USB_REQ_CLEAR_FEATURE\n");
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break;
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case USB_REQ_SET_FEATURE:
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debug("analyze_control_request: req = USB_REQ_SET_FEATURE\n");
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break;
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case USB_REQ_GET_CONFIGURATION:
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debug("analyze_control_request: req = USB_REQ_GET_CONFIGURATION\n");
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return true;
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case USB_REQ_SET_CONFIGURATION:
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debug("analyze_control_request: req = USB_REQ_SET_CONFIGURATION\n");
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break;
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case USB_REQ_GET_INTERFACE:
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debug("analyze_control_request: req = USB_REQ_GET_INTERFACE\n");
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return true;
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case USB_REQ_SET_INTERFACE:
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debug("analyze_control_request: req = USB_REQ_SET_INTERFACE\n");
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break;
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default:
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debug("analyze_control_request: req = unknown = 0x%x\n", (int)ctrl->bRequest);
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break;
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}
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return false;
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}
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static bool analyze_control_request_class(struct usb_device_index* index, struct usb_ctrlrequest* ctrl)
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{
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uint8 bDeviceClass = index->bDeviceClass;
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uint8 bInterfaceClass = index->ifaces[index->iface_cur].bInterfaceClass;
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if (bDeviceClass == USB_CLASS_HID || bInterfaceClass == USB_CLASS_HID) {
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switch (ctrl->bRequest) {
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case HID_REQ_GET_REPORT:
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debug("analyze_control_request: req = HID_REQ_GET_REPORT\n");
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return true;
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case HID_REQ_GET_IDLE:
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debug("analyze_control_request: req = HID_REQ_GET_IDLE\n");
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break;
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case HID_REQ_GET_PROTOCOL:
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debug("analyze_control_request: req = HID_REQ_GET_PROTOCOL\n");
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return true;
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case HID_REQ_SET_REPORT:
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debug("analyze_control_request: req = HID_REQ_SET_REPORT\n");
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break;
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case HID_REQ_SET_IDLE:
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debug("analyze_control_request: req = HID_REQ_SET_IDLE\n");
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break;
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case HID_REQ_SET_PROTOCOL:
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debug("analyze_control_request: req = HID_REQ_SET_PROTOCOL\n");
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break;
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}
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}
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if (bDeviceClass == USB_CLASS_AUDIO || bInterfaceClass == USB_CLASS_AUDIO) {
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switch (ctrl->bRequest) {
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case UAC_SET_CUR:
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debug("analyze_control_request: req = UAC_SET_CUR\n");
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break;
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case UAC_GET_CUR:
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debug("analyze_control_request: req = UAC_GET_CUR\n");
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return true;
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case UAC_SET_MIN:
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debug("analyze_control_request: req = UAC_SET_MIN\n");
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break;
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case UAC_GET_MIN:
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debug("analyze_control_request: req = UAC_GET_MIN\n");
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return true;
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case UAC_SET_MAX:
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debug("analyze_control_request: req = UAC_SET_MAX\n");
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break;
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case UAC_GET_MAX:
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debug("analyze_control_request: req = UAC_GET_MAX\n");
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return true;
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case UAC_SET_RES:
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debug("analyze_control_request: req = UAC_SET_RES\n");
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break;
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case UAC_GET_RES:
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debug("analyze_control_request: req = UAC_GET_RES\n");
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return true;
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case UAC_SET_MEM:
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debug("analyze_control_request: req = UAC_SET_MEM\n");
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break;
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case UAC_GET_MEM:
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debug("analyze_control_request: req = UAC_GET_MEM\n");
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return true;
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}
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}
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if (bDeviceClass == USB_CLASS_PRINTER || bInterfaceClass == USB_CLASS_PRINTER) {
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switch (ctrl->bRequest) {
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case USBLP_REQ_GET_ID:
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debug("analyze_control_request: req = USBLP_REQ_GET_ID\n");
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return true;
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case USBLP_REQ_GET_STATUS:
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debug("analyze_control_request: req = USBLP_REQ_GET_STATUS\n");
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return true;
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case USBLP_REQ_RESET:
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debug("analyze_control_request: req = USBLP_REQ_RESET\n");
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break;
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}
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}
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if (bDeviceClass == USB_CLASS_HUB || bInterfaceClass == USB_CLASS_HUB) {
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switch (ctrl->bRequest) {
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case USB_REQ_GET_DESCRIPTOR:
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switch (ctrl->wValue >> 8) {
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case USB_DT_HUB:
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debug("analyze_control_request: desc = USB_DT_HUB\n");
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return true;
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case USB_DT_SS_HUB:
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debug("analyze_control_request: desc = USB_DT_SS_HUB\n");
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return true;
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}
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case USB_REQ_GET_STATUS:
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debug("analyze_control_request: req = USB_REQ_GET_STATUS\n");
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return true;
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case HUB_SET_DEPTH:
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debug("analyze_control_request: req = HUB_SET_DEPTH\n");
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break;
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}
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}
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if (bInterfaceClass == USB_CLASS_COMM) {
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switch (ctrl->bRequest) {
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case USB_CDC_SEND_ENCAPSULATED_COMMAND:
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debug("analyze_control_request: req = USB_CDC_SEND_ENCAPSULATED_COMMAND\n");
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break;
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case USB_CDC_GET_ENCAPSULATED_RESPONSE:
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debug("analyze_control_request: req = USB_CDC_GET_ENCAPSULATED_RESPONSE\n");
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break;
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case USB_CDC_REQ_SET_LINE_CODING:
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debug("analyze_control_request: req = USB_CDC_REQ_SET_LINE_CODING\n");
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break;
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case USB_CDC_REQ_GET_LINE_CODING:
|
|
debug("analyze_control_request: req = USB_CDC_REQ_GET_LINE_CODING\n");
|
|
break;
|
|
case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
|
|
debug("analyze_control_request: req = USB_CDC_REQ_SET_CONTROL_LINE_STATE\n");
|
|
break;
|
|
case USB_CDC_REQ_SEND_BREAK:
|
|
debug("analyze_control_request: req = USB_CDC_REQ_SEND_BREAK\n");
|
|
break;
|
|
case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
|
|
debug("analyze_control_request: req = USB_CDC_SET_ETHERNET_MULTICAST_FILTERS\n");
|
|
break;
|
|
case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
|
|
debug("analyze_control_request: req = USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER\n");
|
|
break;
|
|
case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
|
|
debug("analyze_control_request: req = USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER\n");
|
|
break;
|
|
case USB_CDC_SET_ETHERNET_PACKET_FILTER:
|
|
debug("analyze_control_request: req = USB_CDC_SET_ETHERNET_PACKET_FILTER\n");
|
|
break;
|
|
case USB_CDC_GET_ETHERNET_STATISTIC:
|
|
debug("analyze_control_request: req = USB_CDC_GET_ETHERNET_STATISTIC\n");
|
|
break;
|
|
case USB_CDC_GET_NTB_PARAMETERS:
|
|
debug("analyze_control_request: req = USB_CDC_GET_NTB_PARAMETERS\n");
|
|
return true;
|
|
case USB_CDC_GET_NET_ADDRESS:
|
|
debug("analyze_control_request: req = USB_CDC_GET_NET_ADDRESS\n");
|
|
break;
|
|
case USB_CDC_SET_NET_ADDRESS:
|
|
debug("analyze_control_request: req = USB_CDC_SET_NET_ADDRESS\n");
|
|
break;
|
|
case USB_CDC_GET_NTB_FORMAT:
|
|
debug("analyze_control_request: req = USB_CDC_GET_NTB_FORMAT\n");
|
|
return true;
|
|
case USB_CDC_SET_NTB_FORMAT:
|
|
debug("analyze_control_request: req = USB_CDC_SET_NTB_FORMAT\n");
|
|
break;
|
|
case USB_CDC_GET_NTB_INPUT_SIZE:
|
|
debug("analyze_control_request: req = USB_CDC_GET_NTB_INPUT_SIZE\n");
|
|
return true;
|
|
case USB_CDC_SET_NTB_INPUT_SIZE:
|
|
debug("analyze_control_request: req = USB_CDC_SET_NTB_INPUT_SIZE\n");
|
|
break;
|
|
case USB_CDC_GET_MAX_DATAGRAM_SIZE:
|
|
debug("analyze_control_request: req = USB_CDC_GET_MAX_DATAGRAM_SIZE\n");
|
|
return true;
|
|
case USB_CDC_SET_MAX_DATAGRAM_SIZE:
|
|
debug("analyze_control_request: req = USB_CDC_SET_MAX_DATAGRAM_SIZE\n");
|
|
break;
|
|
case USB_CDC_GET_CRC_MODE:
|
|
debug("analyze_control_request: req = USB_CDC_GET_CRC_MODE\n");
|
|
return true;
|
|
case USB_CDC_SET_CRC_MODE:
|
|
debug("analyze_control_request: req = USB_CDC_SET_CRC_MODE\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool analyze_control_request_vendor(struct usb_device_index* index, struct usb_ctrlrequest* ctrl)
|
|
{
|
|
// Ignore vendor requests for now.
|
|
return true;
|
|
}
|
|
|
|
// A helper function that prints a request in readable form and returns whether descriptions for this
|
|
// request exist. Needs to be updated manually when new descriptions are added. Useful for debugging.
|
|
static void analyze_control_request(int fd, struct usb_ctrlrequest* ctrl)
|
|
{
|
|
struct usb_device_index* index = lookup_usb_index(fd);
|
|
|
|
if (!index)
|
|
return;
|
|
|
|
switch (ctrl->bRequestType & USB_TYPE_MASK) {
|
|
case USB_TYPE_STANDARD:
|
|
debug("analyze_control_request: type = USB_TYPE_STANDARD\n");
|
|
if (analyze_control_request_standard(index, ctrl))
|
|
return;
|
|
break;
|
|
case USB_TYPE_CLASS:
|
|
debug("analyze_control_request: type = USB_TYPE_CLASS\n");
|
|
if (analyze_control_request_class(index, ctrl))
|
|
return;
|
|
break;
|
|
case USB_TYPE_VENDOR:
|
|
debug("analyze_control_request: type = USB_TYPE_VENDOR\n");
|
|
if (analyze_control_request_vendor(index, ctrl))
|
|
return;
|
|
break;
|
|
}
|
|
|
|
if (ctrl->bRequestType & USB_DIR_IN) {
|
|
char message[128];
|
|
debug("analyze_control_request: unknown control request\n");
|
|
snprintf(&message[0], sizeof(message), "BUG: unknown control request (0x%x, 0x%x, 0x%x, 0x%x, %d)",
|
|
ctrl->bRequestType, ctrl->bRequest, ctrl->wValue, ctrl->wIndex, ctrl->wLength);
|
|
write_file("/dev/kmsg", &message[0]);
|
|
}
|
|
}
|
|
|
|
#endif // USB_DEBUG
|
|
|
|
struct vusb_connect_string_descriptor {
|
|
uint32 len;
|
|
char* str;
|
|
} __attribute__((packed));
|
|
|
|
struct vusb_connect_descriptors {
|
|
uint32 qual_len;
|
|
char* qual;
|
|
uint32 bos_len;
|
|
char* bos;
|
|
uint32 strs_len;
|
|
struct vusb_connect_string_descriptor strs[0];
|
|
} __attribute__((packed));
|
|
|
|
static const char default_string[] = {
|
|
8, USB_DT_STRING,
|
|
's', 0, 'y', 0, 'z', 0 // UTF16-encoded "syz"
|
|
};
|
|
|
|
static const char default_lang_id[] = {
|
|
4, USB_DT_STRING,
|
|
0x09, 0x04 // English (United States)
|
|
};
|
|
|
|
// lookup_connect_response_in() is a helper function that returns a response to a USB IN request
|
|
// based on syzkaller-generated arguments provided to syz_usb_connect* pseudo-syscalls. The data
|
|
// and its length to be used as a response are returned in *response_data and *response_length.
|
|
// The return value of this function lookup_connect_response_inindicates whether the request is known to syzkaller.
|
|
|
|
static bool lookup_connect_response_in(int fd, const struct vusb_connect_descriptors* descs,
|
|
const struct usb_ctrlrequest* ctrl,
|
|
char** response_data, uint32* response_length)
|
|
{
|
|
struct usb_device_index* index = lookup_usb_index(fd);
|
|
uint8 str_idx;
|
|
|
|
if (!index)
|
|
return false;
|
|
|
|
switch (ctrl->bRequestType & USB_TYPE_MASK) {
|
|
case USB_TYPE_STANDARD:
|
|
switch (ctrl->bRequest) {
|
|
case USB_REQ_GET_DESCRIPTOR:
|
|
switch (ctrl->wValue >> 8) {
|
|
case USB_DT_DEVICE:
|
|
*response_data = (char*)index->dev;
|
|
*response_length = sizeof(*index->dev);
|
|
return true;
|
|
case USB_DT_CONFIG:
|
|
*response_data = (char*)index->config;
|
|
*response_length = index->config_length;
|
|
return true;
|
|
case USB_DT_STRING:
|
|
str_idx = (uint8)ctrl->wValue;
|
|
if (descs && str_idx < descs->strs_len) {
|
|
*response_data = descs->strs[str_idx].str;
|
|
*response_length = descs->strs[str_idx].len;
|
|
return true;
|
|
}
|
|
if (str_idx == 0) {
|
|
*response_data = (char*)&default_lang_id[0];
|
|
*response_length = default_lang_id[0];
|
|
return true;
|
|
}
|
|
*response_data = (char*)&default_string[0];
|
|
*response_length = default_string[0];
|
|
return true;
|
|
case USB_DT_BOS:
|
|
*response_data = descs->bos;
|
|
*response_length = descs->bos_len;
|
|
return true;
|
|
case USB_DT_DEVICE_QUALIFIER:
|
|
if (!descs->qual) {
|
|
// Fill in DEVICE_QUALIFIER based on DEVICE if not provided.
|
|
struct usb_qualifier_descriptor* qual =
|
|
(struct usb_qualifier_descriptor*)response_data;
|
|
qual->bLength = sizeof(*qual);
|
|
qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
|
|
qual->bcdUSB = index->dev->bcdUSB;
|
|
qual->bDeviceClass = index->dev->bDeviceClass;
|
|
qual->bDeviceSubClass = index->dev->bDeviceSubClass;
|
|
qual->bDeviceProtocol = index->dev->bDeviceProtocol;
|
|
qual->bMaxPacketSize0 = index->dev->bMaxPacketSize0;
|
|
qual->bNumConfigurations = index->dev->bNumConfigurations;
|
|
qual->bRESERVED = 0;
|
|
*response_length = sizeof(*qual);
|
|
return true;
|
|
}
|
|
*response_data = descs->qual;
|
|
*response_length = descs->qual_len;
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
debug("lookup_connect_response_in: unknown request");
|
|
return false;
|
|
}
|
|
|
|
// lookup_connect_response_out() functions process a USB OUT request and return in *done
|
|
// whether this is the last request that must be handled by syz_usb_connect* pseudo-syscalls.
|
|
|
|
typedef bool (*lookup_connect_out_response_t)(int fd, const struct vusb_connect_descriptors* descs,
|
|
const struct usb_ctrlrequest* ctrl, bool* done);
|
|
|
|
#if SYZ_EXECUTOR || __NR_syz_usb_connect
|
|
static bool lookup_connect_response_out_generic(int fd, const struct vusb_connect_descriptors* descs,
|
|
const struct usb_ctrlrequest* ctrl, bool* done)
|
|
{
|
|
switch (ctrl->bRequestType & USB_TYPE_MASK) {
|
|
case USB_TYPE_STANDARD:
|
|
switch (ctrl->bRequest) {
|
|
case USB_REQ_SET_CONFIGURATION:
|
|
*done = true;
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
debug("lookup_connect_response_out: unknown request");
|
|
return false;
|
|
}
|
|
#endif // SYZ_EXECUTOR || __NR_syz_usb_connect
|
|
|
|
#if GOOS_linux && (SYZ_EXECUTOR || __NR_syz_usb_connect_ath9k)
|
|
|
|
// drivers/net/wireless/ath/ath9k/hif_usb.h
|
|
#define ATH9K_FIRMWARE_DOWNLOAD 0x30
|
|
#define ATH9K_FIRMWARE_DOWNLOAD_COMP 0x31
|
|
|
|
static bool lookup_connect_response_out_ath9k(int fd, const struct vusb_connect_descriptors* descs,
|
|
const struct usb_ctrlrequest* ctrl, bool* done)
|
|
{
|
|
switch (ctrl->bRequestType & USB_TYPE_MASK) {
|
|
case USB_TYPE_STANDARD:
|
|
switch (ctrl->bRequest) {
|
|
case USB_REQ_SET_CONFIGURATION:
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case USB_TYPE_VENDOR:
|
|
switch (ctrl->bRequest) {
|
|
case ATH9K_FIRMWARE_DOWNLOAD:
|
|
return true;
|
|
case ATH9K_FIRMWARE_DOWNLOAD_COMP:
|
|
*done = true;
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
debug("lookup_connect_response_out_ath9k: unknown request");
|
|
return false;
|
|
}
|
|
|
|
#endif // SYZ_EXECUTOR || __NR_syz_usb_connect_ath9k
|
|
|
|
#if GOOS_linux && (SYZ_EXECUTOR || __NR_syz_usb_control_io)
|
|
|
|
struct vusb_descriptor {
|
|
uint8 req_type;
|
|
uint8 desc_type;
|
|
uint32 len;
|
|
char data[0];
|
|
} __attribute__((packed));
|
|
|
|
struct vusb_descriptors {
|
|
uint32 len;
|
|
struct vusb_descriptor* generic;
|
|
struct vusb_descriptor* descs[0];
|
|
} __attribute__((packed));
|
|
|
|
struct vusb_response {
|
|
uint8 type;
|
|
uint8 req;
|
|
uint32 len;
|
|
char data[0];
|
|
} __attribute__((packed));
|
|
|
|
struct vusb_responses {
|
|
uint32 len;
|
|
struct vusb_response* generic;
|
|
struct vusb_response* resps[0];
|
|
} __attribute__((packed));
|
|
|
|
// lookup_control_response() is a helper function that returns a response to a USB IN request based
|
|
// on syzkaller-generated arguments provided to syz_usb_control_io* pseudo-syscalls. The data and its
|
|
// length to be used as a response are returned in *response_data and *response_length. The return
|
|
// value of this function indicates whether the response for this request is provided in
|
|
// syz_usb_control_io* arguments.
|
|
|
|
static bool lookup_control_response(const struct vusb_descriptors* descs, const struct vusb_responses* resps,
|
|
struct usb_ctrlrequest* ctrl, char** response_data, uint32* response_length)
|
|
{
|
|
int descs_num = 0;
|
|
int resps_num = 0;
|
|
|
|
if (descs)
|
|
descs_num = (descs->len - offsetof(struct vusb_descriptors, descs)) / sizeof(descs->descs[0]);
|
|
if (resps)
|
|
resps_num = (resps->len - offsetof(struct vusb_responses, resps)) / sizeof(resps->resps[0]);
|
|
|
|
uint8 req = ctrl->bRequest;
|
|
uint8 req_type = ctrl->bRequestType & USB_TYPE_MASK;
|
|
uint8 desc_type = ctrl->wValue >> 8;
|
|
|
|
if (req == USB_REQ_GET_DESCRIPTOR) {
|
|
int i;
|
|
|
|
for (i = 0; i < descs_num; i++) {
|
|
struct vusb_descriptor* desc = descs->descs[i];
|
|
if (!desc)
|
|
continue;
|
|
if (desc->req_type == req_type && desc->desc_type == desc_type) {
|
|
*response_length = desc->len;
|
|
if (*response_length != 0)
|
|
*response_data = &desc->data[0];
|
|
else
|
|
*response_data = NULL;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
if (descs && descs->generic) {
|
|
*response_data = &descs->generic->data[0];
|
|
*response_length = descs->generic->len;
|
|
return true;
|
|
}
|
|
} else {
|
|
int i;
|
|
|
|
for (i = 0; i < resps_num; i++) {
|
|
struct vusb_response* resp = resps->resps[i];
|
|
if (!resp)
|
|
continue;
|
|
if (resp->type == req_type && resp->req == req) {
|
|
*response_length = resp->len;
|
|
if (*response_length != 0)
|
|
*response_data = &resp->data[0];
|
|
else
|
|
*response_data = NULL;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
if (resps && resps->generic) {
|
|
*response_data = &resps->generic->data[0];
|
|
*response_length = resps->generic->len;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
#endif // SYZ_EXECUTOR || __NR_syz_usb_control_io
|