// https://syzkaller.appspot.com/bug?id=ba67ab2d27477dad7db5b960530d0e4fb60a722e
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#include <linux/usb/ch9.h>

unsigned long long procid;

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

#define USB_DEBUG 0

#define USB_MAX_EP_NUM 32

struct usb_device_index {
  struct usb_device_descriptor* dev;
  struct usb_config_descriptor* config;
  unsigned config_length;
  struct usb_interface_descriptor* iface;
  struct usb_endpoint_descriptor* eps[USB_MAX_EP_NUM];
  unsigned eps_num;
};

static bool parse_usb_descriptor(char* buffer, size_t length,
                                 struct usb_device_index* index)
{
  if (length <
      sizeof(*index->dev) + sizeof(*index->config) + sizeof(*index->iface))
    return false;
  index->dev = (struct usb_device_descriptor*)buffer;
  index->config = (struct usb_config_descriptor*)(buffer + sizeof(*index->dev));
  index->config_length = length - sizeof(*index->dev);
  index->iface =
      (struct usb_interface_descriptor*)(buffer + sizeof(*index->dev) +
                                         sizeof(*index->config));
  index->eps_num = 0;
  size_t offset = 0;
  while (true) {
    if (offset + 1 >= length)
      break;
    uint8_t desc_length = buffer[offset];
    uint8_t desc_type = buffer[offset + 1];
    if (desc_length <= 2)
      break;
    if (offset + desc_length > length)
      break;
    if (desc_type == USB_DT_ENDPOINT) {
      index->eps[index->eps_num] =
          (struct usb_endpoint_descriptor*)(buffer + offset);
      index->eps_num++;
    }
    if (index->eps_num == USB_MAX_EP_NUM)
      break;
    offset += desc_length;
  }
  return true;
}

enum usb_fuzzer_event_type {
  USB_FUZZER_EVENT_INVALID,
  USB_FUZZER_EVENT_CONNECT,
  USB_FUZZER_EVENT_DISCONNECT,
  USB_FUZZER_EVENT_SUSPEND,
  USB_FUZZER_EVENT_RESUME,
  USB_FUZZER_EVENT_CONTROL,
};

struct usb_fuzzer_event {
  uint32_t type;
  uint32_t length;
  char data[0];
};

struct usb_fuzzer_init {
  uint64_t speed;
  const char* driver_name;
  const char* device_name;
};

struct usb_fuzzer_ep_io {
  uint16_t ep;
  uint16_t flags;
  uint32_t length;
  char data[0];
};

#define USB_FUZZER_IOCTL_INIT _IOW('U', 0, struct usb_fuzzer_init)
#define USB_FUZZER_IOCTL_RUN _IO('U', 1)
#define USB_FUZZER_IOCTL_EVENT_FETCH _IOR('U', 2, struct usb_fuzzer_event)
#define USB_FUZZER_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_fuzzer_ep_io)
#define USB_FUZZER_IOCTL_EP0_READ _IOWR('U', 4, struct usb_fuzzer_ep_io)
#define USB_FUZZER_IOCTL_EP_ENABLE _IOW('U', 5, struct usb_endpoint_descriptor)
#define USB_FUZZER_IOCTL_EP_WRITE _IOW('U', 7, struct usb_fuzzer_ep_io)
#define USB_FUZZER_IOCTL_EP_READ _IOWR('U', 8, struct usb_fuzzer_ep_io)
#define USB_FUZZER_IOCTL_CONFIGURE _IO('U', 9)
#define USB_FUZZER_IOCTL_VBUS_DRAW _IOW('U', 10, uint32_t)

int usb_fuzzer_open()
{
  return open("/sys/kernel/debug/usb-fuzzer", O_RDWR);
}

int usb_fuzzer_init(int fd, uint32_t speed, const char* driver,
                    const char* device)
{
  struct usb_fuzzer_init arg;
  arg.speed = speed;
  arg.driver_name = driver;
  arg.device_name = device;
  return ioctl(fd, USB_FUZZER_IOCTL_INIT, &arg);
}

int usb_fuzzer_run(int fd)
{
  return ioctl(fd, USB_FUZZER_IOCTL_RUN, 0);
}

int usb_fuzzer_event_fetch(int fd, struct usb_fuzzer_event* event)
{
  return ioctl(fd, USB_FUZZER_IOCTL_EVENT_FETCH, event);
}

int usb_fuzzer_ep0_write(int fd, struct usb_fuzzer_ep_io* io)
{
  return ioctl(fd, USB_FUZZER_IOCTL_EP0_WRITE, io);
}

int usb_fuzzer_ep0_read(int fd, struct usb_fuzzer_ep_io* io)
{
  return ioctl(fd, USB_FUZZER_IOCTL_EP0_READ, io);
}

int usb_fuzzer_ep_write(int fd, struct usb_fuzzer_ep_io* io)
{
  return ioctl(fd, USB_FUZZER_IOCTL_EP_WRITE, io);
}

int usb_fuzzer_ep_read(int fd, struct usb_fuzzer_ep_io* io)
{
  return ioctl(fd, USB_FUZZER_IOCTL_EP_READ, io);
}

int usb_fuzzer_ep_enable(int fd, struct usb_endpoint_descriptor* desc)
{
  return ioctl(fd, USB_FUZZER_IOCTL_EP_ENABLE, desc);
}

int usb_fuzzer_configure(int fd)
{
  return ioctl(fd, USB_FUZZER_IOCTL_CONFIGURE, 0);
}

int usb_fuzzer_vbus_draw(int fd, uint32_t power)
{
  return ioctl(fd, USB_FUZZER_IOCTL_VBUS_DRAW, power);
}

#define USB_MAX_PACKET_SIZE 1024

struct usb_fuzzer_control_event {
  struct usb_fuzzer_event inner;
  struct usb_ctrlrequest ctrl;
  char data[USB_MAX_PACKET_SIZE];
};

struct usb_fuzzer_ep_io_data {
  struct usb_fuzzer_ep_io inner;
  char data[USB_MAX_PACKET_SIZE];
};

struct vusb_connect_string_descriptor {
  uint32_t len;
  char* str;
} __attribute__((packed));

struct vusb_connect_descriptors {
  uint32_t qual_len;
  char* qual;
  uint32_t bos_len;
  char* bos;
  uint32_t strs_len;
  struct vusb_connect_string_descriptor strs[0];
} __attribute__((packed));

static const char* default_string = "syzkaller";

static bool lookup_connect_response(struct vusb_connect_descriptors* descs,
                                    struct usb_device_index* index,
                                    struct usb_ctrlrequest* ctrl,
                                    char** response_data,
                                    uint32_t* response_length)
{
  uint8_t str_idx;
  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_t)ctrl->wValue;
        if (str_idx >= descs->strs_len) {
          *response_data = (char*)default_string;
          *response_length = strlen(default_string);
        } else {
          *response_data = descs->strs[str_idx].str;
          *response_length = descs->strs[str_idx].len;
        }
        return true;
      case USB_DT_BOS:
        *response_data = descs->bos;
        *response_length = descs->bos_len;
        return true;
      case USB_DT_DEVICE_QUALIFIER:
        *response_data = descs->qual;
        *response_length = descs->qual_len;
        return true;
      default:
        exit(1);
        return false;
      }
      break;
    default:
      exit(1);
      return false;
    }
    break;
  default:
    exit(1);
    return false;
  }
  return false;
}

static volatile long syz_usb_connect(volatile long a0, volatile long a1,
                                     volatile long a2, volatile long a3)
{
  uint64_t speed = a0;
  uint64_t dev_len = a1;
  char* dev = (char*)a2;
  struct vusb_connect_descriptors* descs = (struct vusb_connect_descriptors*)a3;
  if (!dev) {
    return -1;
  }
  struct usb_device_index index;
  memset(&index, 0, sizeof(index));
  int rv = 0;
  rv = parse_usb_descriptor(dev, dev_len, &index);
  if (!rv) {
    return rv;
  }
  int fd = usb_fuzzer_open();
  if (fd < 0) {
    return fd;
  }
  char device[32];
  sprintf(&device[0], "dummy_udc.%llu", procid);
  rv = usb_fuzzer_init(fd, speed, "dummy_udc", &device[0]);
  if (rv < 0) {
    return rv;
  }
  rv = usb_fuzzer_run(fd);
  if (rv < 0) {
    return rv;
  }
  bool done = false;
  while (!done) {
    struct usb_fuzzer_control_event event;
    event.inner.type = 0;
    event.inner.length = sizeof(event.ctrl);
    rv = usb_fuzzer_event_fetch(fd, (struct usb_fuzzer_event*)&event);
    if (rv < 0) {
      return rv;
    }
    if (event.inner.type != USB_FUZZER_EVENT_CONTROL)
      continue;
    bool response_found = false;
    char* response_data = NULL;
    uint32_t response_length = 0;
    if (event.ctrl.bRequestType & USB_DIR_IN) {
      response_found = lookup_connect_response(
          descs, &index, &event.ctrl, &response_data, &response_length);
      if (!response_found) {
        return -1;
      }
    } else {
      if ((event.ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD ||
          event.ctrl.bRequest != USB_REQ_SET_CONFIGURATION) {
        exit(1);
        return -1;
      }
      done = true;
    }
    if (done) {
      rv = usb_fuzzer_vbus_draw(fd, index.config->bMaxPower);
      if (rv < 0) {
        return rv;
      }
      rv = usb_fuzzer_configure(fd);
      if (rv < 0) {
        return rv;
      }
      unsigned ep;
      for (ep = 0; ep < index.eps_num; ep++) {
        rv = usb_fuzzer_ep_enable(fd, index.eps[ep]);
        if (rv < 0) {
        } else {
        }
      }
    }
    struct usb_fuzzer_ep_io_data response;
    response.inner.ep = 0;
    response.inner.flags = 0;
    if (response_length > sizeof(response.data))
      response_length = 0;
    if (event.ctrl.wLength < response_length)
      response_length = event.ctrl.wLength;
    response.inner.length = response_length;
    if (response_data)
      memcpy(&response.data[0], response_data, response_length);
    else
      memset(&response.data[0], 0, response_length);
    if (event.ctrl.bRequestType & USB_DIR_IN) {
      rv = usb_fuzzer_ep0_write(fd, (struct usb_fuzzer_ep_io*)&response);
    } else {
      rv = usb_fuzzer_ep0_read(fd, (struct usb_fuzzer_ep_io*)&response);
    }
    if (rv < 0) {
      return rv;
    }
  }
  sleep_ms(200);
  return fd;
}

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);

  memcpy(
      (void*)0x20000400,
      "\x12\x01\x00\x00\x00\x00\x00\x20\x6d\x04\x1c\xc7\x40\x00\x00\x00\x00\x01"
      "\x09\x02\x24\x00\x01\x00\x00\xa0\x00\x09\x04\x00\x00\x09\x03\x01\x01\x00"
      "\x09\x21\x00\x00\x00\x01\x22\x15\x00\x09\x05\x81\x03\x00\x00\x00\x00\x00"
      "\xee\xb4\x88\x8f\xff\xfc\x1f\xe0\x2d\xa3\x65\xa9\xc4\x6b\xcb\x5b\x6a\x6b"
      "\xb4\xd9\x37\x02\x99\x2a\x7d\x26\xce\xfe\x8b\x90\x61\x70\x1c\x3c\xcd\x35"
      "\x2d\x15\x83\x2b\xe2\x59\x85\x90\x20\x08\x5b\x4a\x55\x25\xda\xaa\xfd\xc4"
      "\x9f\x59\x66\xf9\x00\x63\x4c\x11\xc5\x62\x10\x23\x5d\xca\x74\xb0\x5a\xbe"
      "\xdf\x3b\x46\xe5\xd9\x29\x2b\x05\x00\xe1\x8c\x4a\x00\x00\x00\x00\x9c\xc7"
      "\x04\xcc\x79\x15\x55\x97\x94\x80\x5a\x7a\xb1\x3d\x44\x84\x90\xdb\xac\xf2"
      "\x68\xac\x24\x72\x3a\xcf\x3c\xa4\x84\x0a\xf0\x39\xb7\xf9\xb8\x36\xbd\xe4"
      "\x66\xbe\x4d\x32\x35\x99\x80\x1b\x61\xa4\xa4\xfd\x48\x44\xf9\xeb\xc1\xd2"
      "\xc0\x99\xd1\x74\x7d\x8a\x91\xb7\x62\xf8\x21\x02\x49\x1b\x72\x36\x20\xa3"
      "\xb8\x27\x0a\x84\x5f\xf9\xf1\xc3\xb2\x59\x2b\x1c\x7b\xf2\x32\x64\xe0\x73"
      "\x61\x9b\x76\x05\xc4\x6f\xe4\x0f\xa7\xc3\xf5\x04\xd8\xc8\xea\x34\xf3\xb2"
      "\x2e\x92\x00\x55\xf2\x4e\x2e\xb6\x78\xb7\x27\xfb\x1a\xc5\xfd\x57\x81\x44"
      "\xe9\x37\xfd\x37\xa0\xd3\xc6\x04\x6a\xbd\xe8\x52\x6b\x5f\xca\xf1\x31\xe7"
      "\xf4\x81\x2a\x08\x24\xfa\x5f\x4d\x83\x94\x8b\xa6\x68\xf5\x6a\xe3\xe8\x62"
      "\x0d\x99\xb9\xc1\xf7\x85\x82\x65\x28\x78\x50\x84\x94\xe0\xc4\x14\xf9\x8f"
      "\x00\x11\xe4\x80\x59\xb8\x75\x82\x9a\x88\x8f\xe1\x7b\x21\xdf\xa2\x20\x06"
      "\xeb\xc7\x72\x17\x4d\x01\x54\x90\xa6\x44\x73\xe4\xc9\x35\x70\x45\x01\x30"
      "\x1c\xf5\x2e\xd2\x74\x04\xac\x30\xd1\x8c\xbb\xee\xe2\x4d\x2b\x8f\x6e\x05"
      "\x9c\x28\x8d\x50\xcc\x67\xf3\x86\x7c\xe5\x40\x31\xe1\x90\x5d\xc7\xc5\xea"
      "\xa2\x6b\xe3\xf4\x42\xf0\x3b\x58\xa2\x86\xa0\xfd\xf0\xf9\xf5\x56\xb7\x2c"
      "\xe8\x9f\x13\xbc\xd8\xe8\x93\xda\x40\x0a\xd1\x31\x8d\x76\xa8\x62\xa7\x6f"
      "\xb7\xa1\x49\xaf\x39\x37\x9d\x9f\x4e\xdf\x33\xe0\x83\xb8\x26\x9d\xa2\x4c"
      "\xc9\xf0\x90\xff\xe7\xeb\x07\x8a\x60\x50\x1f\x47\x43\x95\x46\x5e\x68\x7f"
      "\x67\xcf\xef\x7b\xc9\x04\x42\xc4\x2d\x43\xd1\x08\x41\x3a\x24\xdc\x94\x25"
      "\xf0\xb3\x26\xc2\xf3\x75\x9c\xb7\x96\xfa\x6a\x86\x75\x57\x55\x08\x49\xb6"
      "\xc9\xc5\xa3\x4b\x7a\x64\x98\xeb\xd5\x0e\x4e\x0c\xe1\xda\x1d\x05\x8d\xeb"
      "\x3d\x42\x44\x73\x32\xcb\xbd\xe6\xec\xc1\x23\xcc\x2e\x4d\x4d\x3e\x50\x2b"
      "\xdd\xa0\xdb\xc9\x54\x78\xa0\x2c\xef\xc6\xdf\x24\x2c\xca\x03\x8f\xc4\x38"
      "\x36\x94\xde\x69\x8b\xec\xde\xeb\xdc\xe5\x9a\x82\xff\x59\x44\x83\x31\x9b"
      "\x51\xea\xed\xd1\x51\xc3\xf8\x9f\x28\x21\x22\x45\xf0\xc8\xa4\x1d\x0d\x95"
      "\x7b\x4c\x11\xb9\x04\xab\x8a\x11\x46\x43\x88\x31\x63\xb1\x68\x27\x5d\xc3"
      "\x8b\x0d\x9d\x64\xfc\xc9\xd1\x62\x3f\xcb\xf0\x7e\x5a\x33\x6a\x0f\x00\x00"
      "\x00\x00\x00\x00\x0a\x37\x25\x33\x11\x27\x6f\xf7\x04\x39\xc7\x6d\xef\xb6"
      "\x22\x9b\xb9\x59\xb0\x07\xf3\x41\xce\x76\x6c\x42\x91\x20\x98\x57\x70\x75"
      "\x9f\x34\xda\x7c\x1c\x5f\x0b\xbc\x9c\xac\xbf\x7f\xe7\x09\x00",
      681);
  syz_usb_connect(0, 0x36, 0x20000400, 0);
  return 0;
}