// https://syzkaller.appspot.com/bug?id=3972554833ffd5c0897b312d8e2749ecbca4770d
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <signal.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/prctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/genetlink.h>
#include <linux/if_addr.h>
#include <linux/if_link.h>
#include <linux/in6.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/usb/ch9.h>
#include <linux/veth.h>

unsigned long long procid;

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

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

struct nlmsg {
  char* pos;
  int nesting;
  struct nlattr* nested[8];
  char buf[1024];
};

static struct nlmsg nlmsg;

static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
                         const void* data, int size)
{
  memset(nlmsg, 0, sizeof(*nlmsg));
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_type = typ;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
  memcpy(hdr + 1, data, size);
  nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
}

static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data,
                         int size)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_len = sizeof(*attr) + size;
  attr->nla_type = typ;
  memcpy(attr + 1, data, size);
  nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}

static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type,
                            int* reply_len)
{
  if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
    exit(1);
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
  struct sockaddr_nl addr;
  memset(&addr, 0, sizeof(addr));
  addr.nl_family = AF_NETLINK;
  unsigned n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0,
                      (struct sockaddr*)&addr, sizeof(addr));
  if (n != hdr->nlmsg_len)
    exit(1);
  n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  if (hdr->nlmsg_type == NLMSG_DONE) {
    *reply_len = 0;
    return 0;
  }
  if (n < sizeof(struct nlmsghdr))
    exit(1);
  if (reply_len && hdr->nlmsg_type == reply_type) {
    *reply_len = n;
    return 0;
  }
  if (n < sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))
    exit(1);
  if (hdr->nlmsg_type != NLMSG_ERROR)
    exit(1);
  return -((struct nlmsgerr*)(hdr + 1))->error;
}

static int netlink_send(struct nlmsg* nlmsg, int sock)
{
  return netlink_send_ext(nlmsg, sock, 0, NULL);
}

static int netlink_next_msg(struct nlmsg* nlmsg, unsigned int offset,
                            unsigned int total_len)
{
  struct nlmsghdr* hdr = (struct nlmsghdr*)(nlmsg->buf + offset);
  if (offset == total_len || offset + hdr->nlmsg_len > total_len)
    return -1;
  return hdr->nlmsg_len;
}

static void netlink_device_change(struct nlmsg* nlmsg, int sock,
                                  const char* name, bool up, const char* master,
                                  const void* mac, int macsize,
                                  const char* new_name)
{
  struct ifinfomsg hdr;
  memset(&hdr, 0, sizeof(hdr));
  if (up)
    hdr.ifi_flags = hdr.ifi_change = IFF_UP;
  hdr.ifi_index = if_nametoindex(name);
  netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr));
  if (new_name)
    netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name));
  if (master) {
    int ifindex = if_nametoindex(master);
    netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex));
  }
  if (macsize)
    netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize);
  int err = netlink_send(nlmsg, sock);
  (void)err;
}

const int kInitNetNsFd = 239;

#define DEVLINK_FAMILY_NAME "devlink"

#define DEVLINK_CMD_PORT_GET 5
#define DEVLINK_CMD_RELOAD 37
#define DEVLINK_ATTR_BUS_NAME 1
#define DEVLINK_ATTR_DEV_NAME 2
#define DEVLINK_ATTR_NETDEV_NAME 7
#define DEVLINK_ATTR_NETNS_FD 138

static int netlink_devlink_id_get(struct nlmsg* nlmsg, int sock)
{
  struct genlmsghdr genlhdr;
  struct nlattr* attr;
  int err, n;
  uint16_t id = 0;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = CTRL_CMD_GETFAMILY;
  netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, DEVLINK_FAMILY_NAME,
               strlen(DEVLINK_FAMILY_NAME) + 1);
  err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n);
  if (err) {
    return -1;
  }
  attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN +
                          NLMSG_ALIGN(sizeof(genlhdr)));
  for (; (char*)attr < nlmsg->buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
      id = *(uint16_t*)(attr + 1);
      break;
    }
  }
  if (!id) {
    return -1;
  }
  recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); /* recv ack */
  return id;
}

static void netlink_devlink_netns_move(const char* bus_name,
                                       const char* dev_name, int netns_fd)
{
  struct genlmsghdr genlhdr;
  int sock;
  int id, err;
  sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (sock == -1)
    exit(1);
  id = netlink_devlink_id_get(&nlmsg, sock);
  if (id == -1)
    goto error;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = DEVLINK_CMD_RELOAD;
  netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1);
  netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1);
  netlink_attr(&nlmsg, DEVLINK_ATTR_NETNS_FD, &netns_fd, sizeof(netns_fd));
  err = netlink_send(&nlmsg, sock);
  if (err) {
  }
error:
  close(sock);
}

static struct nlmsg nlmsg2;

static void initialize_devlink_ports(const char* bus_name, const char* dev_name,
                                     const char* netdev_prefix)
{
  struct genlmsghdr genlhdr;
  int len, total_len, id, err, offset;
  uint16_t netdev_index;
  int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (sock == -1)
    exit(1);
  int rtsock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
  if (rtsock == -1)
    exit(1);
  id = netlink_devlink_id_get(&nlmsg, sock);
  if (id == -1)
    goto error;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = DEVLINK_CMD_PORT_GET;
  netlink_init(&nlmsg, id, NLM_F_DUMP, &genlhdr, sizeof(genlhdr));
  netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1);
  netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1);
  err = netlink_send_ext(&nlmsg, sock, id, &total_len);
  if (err) {
    goto error;
  }
  offset = 0;
  netdev_index = 0;
  while ((len = netlink_next_msg(&nlmsg, offset, total_len)) != -1) {
    struct nlattr* attr = (struct nlattr*)(nlmsg.buf + offset + NLMSG_HDRLEN +
                                           NLMSG_ALIGN(sizeof(genlhdr)));
    for (; (char*)attr < nlmsg.buf + offset + len;
         attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
      if (attr->nla_type == DEVLINK_ATTR_NETDEV_NAME) {
        char* port_name;
        char netdev_name[IFNAMSIZ];
        port_name = (char*)(attr + 1);
        snprintf(netdev_name, sizeof(netdev_name), "%s%d", netdev_prefix,
                 netdev_index);
        netlink_device_change(&nlmsg2, rtsock, port_name, true, 0, 0, 0,
                              netdev_name);
        break;
      }
    }
    offset += len;
    netdev_index++;
  }
error:
  close(rtsock);
  close(sock);
}

static void initialize_devlink_pci(void)
{
  int netns = open("/proc/self/ns/net", O_RDONLY);
  if (netns == -1)
    exit(1);
  int ret = setns(kInitNetNsFd, 0);
  if (ret == -1)
    exit(1);
  netlink_devlink_netns_move("pci", "0000:00:10.0", netns);
  ret = setns(netns, 0);
  if (ret == -1)
    exit(1);
  close(netns);
  initialize_devlink_ports("pci", "0000:00:10.0", "netpci");
}

#define MAX_FDS 30

#define USB_MAX_IFACE_NUM 4
#define USB_MAX_EP_NUM 32

struct usb_iface_index {
  struct usb_interface_descriptor* iface;
  uint8_t bInterfaceNumber;
  uint8_t bAlternateSetting;
  uint8_t bInterfaceClass;
  struct usb_endpoint_descriptor eps[USB_MAX_EP_NUM];
  int eps_num;
};

struct usb_device_index {
  struct usb_device_descriptor* dev;
  struct usb_config_descriptor* config;
  uint8_t bDeviceClass;
  uint8_t bMaxPower;
  int config_length;
  struct usb_iface_index ifaces[USB_MAX_IFACE_NUM];
  int ifaces_num;
  int iface_cur;
};

static bool parse_usb_descriptor(char* buffer, size_t length,
                                 struct usb_device_index* index)
{
  if (length < sizeof(*index->dev) + sizeof(*index->config))
    return false;
  memset(index, 0, sizeof(*index));
  index->dev = (struct usb_device_descriptor*)buffer;
  index->config = (struct usb_config_descriptor*)(buffer + sizeof(*index->dev));
  index->bDeviceClass = index->dev->bDeviceClass;
  index->bMaxPower = index->config->bMaxPower;
  index->config_length = length - sizeof(*index->dev);
  index->iface_cur = -1;
  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_INTERFACE &&
        index->ifaces_num < USB_MAX_IFACE_NUM) {
      struct usb_interface_descriptor* iface =
          (struct usb_interface_descriptor*)(buffer + offset);
      index->ifaces[index->ifaces_num].iface = iface;
      index->ifaces[index->ifaces_num].bInterfaceNumber =
          iface->bInterfaceNumber;
      index->ifaces[index->ifaces_num].bAlternateSetting =
          iface->bAlternateSetting;
      index->ifaces[index->ifaces_num].bInterfaceClass = iface->bInterfaceClass;
      index->ifaces_num++;
    }
    if (desc_type == USB_DT_ENDPOINT && index->ifaces_num > 0) {
      struct usb_iface_index* iface = &index->ifaces[index->ifaces_num - 1];
      if (iface->eps_num < USB_MAX_EP_NUM) {
        memcpy(&iface->eps[iface->eps_num], buffer + offset,
               sizeof(iface->eps[iface->eps_num]));
        iface->eps_num++;
      }
    }
    offset += desc_length;
  }
  return true;
}

struct usb_raw_init {
  __u64 speed;
  const __u8* driver_name;
  const __u8* device_name;
};

enum usb_raw_event_type {
  USB_RAW_EVENT_INVALID,
  USB_RAW_EVENT_CONNECT,
  USB_RAW_EVENT_CONTROL,
};

struct usb_raw_event {
  __u32 type;
  __u32 length;
  __u8 data[0];
};

struct usb_raw_ep_io {
  __u16 ep;
  __u16 flags;
  __u32 length;
  __u8 data[0];
};

#define USB_RAW_IOCTL_INIT _IOW('U', 0, struct usb_raw_init)
#define USB_RAW_IOCTL_RUN _IO('U', 1)
#define USB_RAW_IOCTL_EVENT_FETCH _IOR('U', 2, struct usb_raw_event)
#define USB_RAW_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_EP0_READ _IOWR('U', 4, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_EP_ENABLE _IOW('U', 5, struct usb_endpoint_descriptor)
#define USB_RAW_IOCTL_EP_DISABLE _IOW('U', 6, __u32)
#define USB_RAW_IOCTL_EP_WRITE _IOW('U', 7, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_EP_READ _IOWR('U', 8, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_CONFIGURE _IO('U', 9)
#define USB_RAW_IOCTL_VBUS_DRAW _IOW('U', 10, __u32)

static int usb_raw_open()
{
  return open("/dev/raw-gadget", O_RDWR);
}

static int usb_raw_init(int fd, uint32_t speed, const char* driver,
                        const char* device)
{
  struct usb_raw_init arg;
  arg.speed = speed;
  arg.driver_name = (const __u8*)driver;
  arg.device_name = (const __u8*)device;
  return ioctl(fd, USB_RAW_IOCTL_INIT, &arg);
}

static int usb_raw_run(int fd)
{
  return ioctl(fd, USB_RAW_IOCTL_RUN, 0);
}

static int usb_raw_event_fetch(int fd, struct usb_raw_event* event)
{
  return ioctl(fd, USB_RAW_IOCTL_EVENT_FETCH, event);
}

static int usb_raw_ep0_write(int fd, struct usb_raw_ep_io* io)
{
  return ioctl(fd, USB_RAW_IOCTL_EP0_WRITE, io);
}

static int usb_raw_ep0_read(int fd, struct usb_raw_ep_io* io)
{
  return ioctl(fd, USB_RAW_IOCTL_EP0_READ, io);
}

static int usb_raw_ep_enable(int fd, struct usb_endpoint_descriptor* desc)
{
  return ioctl(fd, USB_RAW_IOCTL_EP_ENABLE, desc);
}

static int usb_raw_ep_disable(int fd, int ep)
{
  return ioctl(fd, USB_RAW_IOCTL_EP_DISABLE, ep);
}

static int usb_raw_configure(int fd)
{
  return ioctl(fd, USB_RAW_IOCTL_CONFIGURE, 0);
}

static int usb_raw_vbus_draw(int fd, uint32_t power)
{
  return ioctl(fd, USB_RAW_IOCTL_VBUS_DRAW, power);
}

#define MAX_USB_FDS 6

struct usb_info {
  int fd;
  struct usb_device_index index;
};

static struct usb_info usb_devices[MAX_USB_FDS];
static int usb_devices_num;

static struct usb_device_index* add_usb_index(int fd, char* dev, size_t dev_len)
{
  int i = __atomic_fetch_add(&usb_devices_num, 1, __ATOMIC_RELAXED);
  if (i >= MAX_USB_FDS)
    return NULL;
  int rv = 0;
  rv = parse_usb_descriptor(dev, dev_len, &usb_devices[i].index);
  if (!rv)
    return NULL;
  __atomic_store_n(&usb_devices[i].fd, fd, __ATOMIC_RELEASE);
  return &usb_devices[i].index;
}

static struct usb_device_index* lookup_usb_index(int fd)
{
  int i;
  for (i = 0; i < MAX_USB_FDS; i++) {
    if (__atomic_load_n(&usb_devices[i].fd, __ATOMIC_ACQUIRE) == fd) {
      return &usb_devices[i].index;
    }
  }
  return NULL;
}

static void set_interface(int fd, int n)
{
  struct usb_device_index* index = lookup_usb_index(fd);
  int ep;
  if (!index)
    return;
  if (index->iface_cur >= 0 && index->iface_cur < index->ifaces_num) {
    for (ep = 0; ep < index->ifaces[index->iface_cur].eps_num; ep++) {
      int rv = usb_raw_ep_disable(fd, ep);
      if (rv < 0) {
      } else {
      }
    }
  }
  if (n >= 0 && n < index->ifaces_num) {
    for (ep = 0; ep < index->ifaces[n].eps_num; ep++) {
      int rv = usb_raw_ep_enable(fd, &index->ifaces[n].eps[ep]);
      if (rv < 0) {
      } else {
      }
    }
    index->iface_cur = n;
  }
}

static int configure_device(int fd)
{
  struct usb_device_index* index = lookup_usb_index(fd);
  if (!index)
    return -1;
  int rv = usb_raw_vbus_draw(fd, index->bMaxPower);
  if (rv < 0) {
    return rv;
  }
  rv = usb_raw_configure(fd);
  if (rv < 0) {
    return rv;
  }
  set_interface(fd, 0);
  return 0;
}

#define USB_MAX_PACKET_SIZE 1024

struct usb_raw_control_event {
  struct usb_raw_event inner;
  struct usb_ctrlrequest ctrl;
  char data[USB_MAX_PACKET_SIZE];
};

struct usb_raw_ep_io_data {
  struct usb_raw_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[] = {8, USB_DT_STRING, 's', 0, 'y', 0, 'z', 0};

static const char default_lang_id[] = {4, USB_DT_STRING, 0x09, 0x04};

static bool lookup_connect_response(int fd,
                                    struct vusb_connect_descriptors* descs,
                                    struct usb_ctrlrequest* ctrl,
                                    char** response_data,
                                    uint32_t* response_length)
{
  struct usb_device_index* index = lookup_usb_index(fd);
  uint8_t 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_t)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) {
          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:
        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;
  }
  int fd = usb_raw_open();
  if (fd < 0) {
    return fd;
  }
  if (fd >= MAX_FDS) {
    close(fd);
    return -1;
  }
  struct usb_device_index* index = add_usb_index(fd, dev, dev_len);
  if (!index) {
    return -1;
  }
  char device[32];
  sprintf(&device[0], "dummy_udc.%llu", procid);
  int rv = usb_raw_init(fd, speed, "dummy_udc", &device[0]);
  if (rv < 0) {
    return rv;
  }
  rv = usb_raw_run(fd);
  if (rv < 0) {
    return rv;
  }
  bool done = false;
  while (!done) {
    struct usb_raw_control_event event;
    event.inner.type = 0;
    event.inner.length = sizeof(event.ctrl);
    rv = usb_raw_event_fetch(fd, (struct usb_raw_event*)&event);
    if (rv < 0) {
      return rv;
    }
    if (event.inner.type != USB_RAW_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(
          fd, descs, &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 = configure_device(fd);
      if (rv < 0) {
        return rv;
      }
    }
    struct usb_raw_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_raw_ep0_write(fd, (struct usb_raw_ep_io*)&response);
    } else {
      rv = usb_raw_ep0_read(fd, (struct usb_raw_ep_io*)&response);
    }
    if (rv < 0) {
      return rv;
    }
  }
  sleep_ms(200);
  return fd;
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

void execute_one(void)
{
  memcpy(
      (void*)0x20000900,
      "\x12\x01\x00\x00\x59\x56\xf3\x08\x40\x20\x02\xc6\x8e\x3e\x00\x00\x00\x01"
      "\x09\x02\x0d\x04\x02\xfc\x7f\x00\x00\x09\x04\x00\x81\x06\x4a\xe0\xe9\x3f"
      "\x09\x21\x31\x01\x08\x01\x22\x8e\x01\x09\x05\x84\x00\x8b\x01\x05\x01\x09"
      "\x95\x05\x25\x8d\xc3\xd3\xcc\xd2\x59\x4f\xfb\x00\xda\x9d\xd2\xf4\x06\x3a"
      "\x27\xa1\xce\xf8\x98\x83\xd2\xfc\x10\x96\xa0\x18\x47\xe1\xd0\x95\x71\x21"
      "\x0b\xc9\x65\xc8\xd6\xcd\x46\xd8\xa2\x2c\x6f\x59\x26\xc7\x4f\x19\x75\x4e"
      "\x71\xe4\x75\x92\x32\x05\xa9\x08\x1e\x80\x15\xcf\x0d\x23\x9b\x75\xf1\x82"
      "\xc0\xb9\x70\xb7\x5d\xec\xfc\xf9\x3b\xb3\x35\x8b\xf3\xa7\xd4\xd5\x55\x5a"
      "\x02\x6d\x21\x9b\xb8\x6d\x55\x4c\x4d\x78\x10\x94\xe1\x0c\x72\x06\x28\x4e"
      "\xe8\xf5\xd4\x96\xd3\xb5\xa6\xbc\x9d\xae\x4c\xe7\xeb\x16\x5f\xf5\x99\xcb"
      "\x97\xae\xa6\xb8\x78\xcf\x1c\x58\xde\x68\xd5\x98\xc6\x1a\x54\x3b\x63\x44"
      "\xbe\x12\xf0\x66\x5d\x07\x25\x01\x06\x05\x01\x00\x09\x05\x01\x10\x08\x02"
      "\x40\x20\x00\x09\x05\x08\x08\x33\x02\xb3\x3c\x89\x09\x05\x0c\x10\x3e\x00"
      "\x06\x01\x00\x09\x05\x02\x03\xb5\x02\x05\x08\x07\x68\x09\x22\xfb\x50\xd8"
      "\xd4\xf8\xa0\xd2\x31\x7b\xf9\x47\x0e\xd3\xce\x15\x45\x3b\x81\xbd\x12\xe3"
      "\x5b\x2c\xb2\x0e\x13\xf9\x4a\x44\x54\x02\x60\xc2\x7a\x58\x25\x82\xce\x94"
      "\x7f\x28\x67\x21\x95\x2c\xd6\x7f\x24\xa4\x8a\x89\xf5\xe8\x5e\xd5\x67\x45"
      "\x62\x51\x4f\x0c\x4d\xdf\x4a\xf1\xaf\xf9\x45\xc2\x05\x7d\x36\x63\x5c\x91"
      "\x6a\x1b\xe8\x38\x3a\xc2\xbf\xe5\x0c\xfd\xe5\xaa\xda\x69\xa1\x50\x64\xdf"
      "\xd5\x80\x08\x2a\xa5\x47\xd5\x27\xdb\xd3\x2a\x5b\xa6\x07\x25\x01\x01\x8d"
      "\xff\xff\x09\x05\x04\x02\xf3\x01\x6c\x0c\x01\x37\x24\xe1\x55\x63\xf4\x22"
      "\xc8\xfb\x3d\xfc\xe1\x62\xa0\x7c\x42\xcf\xc8\x5e\x79\x31\x05\xed\xb1\xb6"
      "\xf6\x17\xc4\xd0\x54\x43\x8c\x2f\xf3\x6d\x59\x7e\x08\x38\xd4\xc0\xda\xec"
      "\x0b\x77\x8b\x0f\x2d\xac\x92\x94\xb9\x8c\x96\x99\x08\x04\xb4\x01\x09\xff"
      "\xff\xff\x00\x09\x21\x09\x00\xea\x01\x22\x7f\x08\x09\x05\x05\x00\xbe\x02"
      "\x4d\xcb\x40\x07\x25\x01\x80\x01\x07\x00\x42\x26\xaf\x03\x65\xc2\x47\xa1"
      "\xf4\x28\x3b\x2f\x1c\x2f\x98\x28\xae\x79\x4f\xa4\x17\x76\x49\x5e\x38\x54"
      "\xef\x1b\xd8\xee\xc3\x6f\xc5\xf1\x56\xbb\xd7\x8e\xf2\x2f\x99\x5a\x9c\x5c"
      "\x29\x5b\xc1\x1c\x3c\xc1\x7d\x02\x65\x58\x7d\x61\x1a\x82\xa8\xff\xb1\x00"
      "\xa2\x6c\xb7\x86\x09\x05\x01\x02\x82\x01\x6e\x09\x1f\xe5\x06\xf3\x51\x53"
      "\x0a\xf7\x19\x5a\xf4\x29\x45\xcf\xda\x4d\x98\xfa\xbc\x0e\x66\xc5\xf2\x07"
      "\x46\x3a\xcb\xba\x69\x91\x18\x23\x8e\x72\xf8\x17\x1c\x71\xa4\x40\x37\xe9"
      "\x91\x07\xba\x09\xf6\x7d\x39\x87\xa3\x1c\x9a\x0f\x23\xf7\xb9\xdb\x95\x02"
      "\x81\x8e\xb1\x96\x46\xa0\x63\x5a\x3c\xf3\x1c\x2d\xe2\x61\xf2\x5a\x2c\x31"
      "\x38\xd9\x0e\x4d\xec\x86\xcc\x8d\x31\x1d\xb7\x18\x6d\xd7\x63\x2d\xdd\x2a"
      "\xa6\xe3\x48\x9e\x12\x7f\xb8\xe9\x8d\xe4\xe2\xdc\xb4\x54\x62\x7e\xff\x56"
      "\x57\x16\x0a\xce\x86\xb9\x30\x75\x86\x46\xe4\x46\x1b\x16\x60\x26\x9b\xf6"
      "\xc2\x31\x22\xcf\x54\x83\xf9\x97\x93\x98\xd5\xe2\x06\x50\x92\x4a\x66\xe5"
      "\xa8\x6c\x03\x3b\x28\x5f\x41\x16\x99\x1d\xf2\xed\xf3\x27\x19\x27\xcb\x73"
      "\xd1\x9d\x91\x60\x21\xfc\x6b\x2f\xbc\x91\xad\x0f\x78\xfa\x0f\x94\xa2\x89"
      "\xef\xdb\x7d\x7e\x98\x44\xae\x10\x28\xe7\xbc\xab\x20\x3f\x69\x0c\xff\x2a"
      "\x8a\xec\xd3\x2e\xb1\x56\x6d\x7f\xb7\x56\x0e\xcf\x2f\x36\x0c\xc1\x56\x67"
      "\xb9\x3f\xdb\x73\xa8\x2b\xce\x46\x3e\x0e\xec\x60\xbb\xd9\x61\x24\x3c\x92"
      "\xe3\x59\x12\x10\x77\xae\x45\x1f\x00\xda\xb1\x1c\x72\x25\x45\x3b\x0b\xe4"
      "\x35\x2c\xd9\x08\xe7\x26\x92\xe3\x81\x40\xa2\x25\x85\x44\xb6\x32\xe0\x78"
      "\x22\x84\x99\x70\x1a\xf6\xb5\x20\xc2\x56\x62\xae\x66\x5a\xdd\x6e\x09\x05"
      "\x0e\x0a\xb8\x01\x00\x1f\x04\x07\x25\x01\x81\x80\x08\x00\x09\x05\x05\x08"
      "\x00\x04\x00\x01\x09\x09\x05\x80\x1c\xd8\x00\x00\x00\x01\x09\x05\x09\x10"
      "\x60\x00\x20\x02\x68\x07\x25\x01\x01\x01\x03\x00\x09\x05\x0f\x10\x66\x03"
      "\x00\x3f\x00\x09\x05\x01\x08\x03\x01\x01\x09\x00\x07\x25\x01\x01\x08\x06"
      "\x00\x8f\x31\xa4\xbf\x6e\x26\xf8\x76\x41\xf6\x03\x27\x8b\x78\x2f\xe2\x2a"
      "\x99\xeb\x8c\x0b\xb8\x3c\xe3\xcd\x04\xa4\xde\x1c\x58\x8d\xb3\xe3\xaf\x8d"
      "\x41\xa7\xc2\xdd\xea\xd2\x7f\xc6\x6e\x72\xa9\x11\xd2\x96\xb2\xf0\x2e\x7f"
      "\x1e\x60\x04\x69\x76\x72\x17\xa6\x9c\x9c\xcf\xa9\xe5\x53\xe4\x9f\x6c\xc9"
      "\x8c\x18\x81\x37\x31\xbf\x2f\x04\x6d\x99\x91\x5a\x6f\x40\x16\xbe\xbd\xdd"
      "\x8e\x76\x6e\x6f\x72\xd6\x48\x3c\x3b\x3f\x6e\x89\x08\xa9\x39\x4e\x0e\x74"
      "\xef\x25\x83\x5c\xc1\xea\x2d\x2d\x6f\xe6\x21\x35\x02\x39\xc2\xea\x88\x55"
      "\xa1\x69\xad\x27\xa3\xd8\x04\xe6\x91\x65\xdc\x30\x78\x1f\xcb\x96\x9f\xac"
      "\x09\x05\x00\x0c\xf0\x01\x07\x20\x92\x07\x25\x01\x82\x81\xab\x00\xbf\xeb"
      "\x2f\x75\x9c\x08\x33\x6a\x85\x67\x0c\xe7\x21\xd8\xb8\x1a\xe3\x81\x07\x84"
      "\x10\x5d\x94\xf8\xfe\x65\xb6\xac\x1e\x45\x0b\x6b\x2c\x13\x09\xde\xbf\x1a"
      "\x88\xd3\xdd\x72\x82\x52\x8f\xef\x66\xea\xa3\x93\x1d\xde\x10\x83\x46\xa2"
      "\xb1\x2c\xa9\xe4\x36\xee\xfc\x45\xc5\xab\x8f\xcb\x4f\xac\x5a\xd7\xc6\x93"
      "\x44\xe1\xda\x59\x3c\x85\x9f\xbe\x27\x0e\x66\x1c\x7c\x65\x50\x14\x47\x6d"
      "\x27\x17\xfe\x24\xb7\x22\x0d\xfb\xb3\x99\x27\x76\xcf\x2c\x30\x8f",
      1168);
  syz_usb_connect(0, 0x333, 0x20000900, 0);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0);
  loop();
  return 0;
}