// https://syzkaller.appspot.com/bug?id=cd8b9cfe50a0bf36ee19eda2d7e2e06843dfbeaf
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/usb/ch9.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;
}

#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_EP0_READ _IOWR('U', 2, struct usb_fuzzer_event)
#define USB_FUZZER_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_fuzzer_ep_io)
#define USB_FUZZER_IOCTL_EP_ENABLE _IOW('U', 4, struct usb_endpoint_descriptor)
#define USB_FUZZER_IOCTL_EP_WRITE _IOW('U', 6, struct usb_fuzzer_ep_io)
#define USB_FUZZER_IOCTL_EP_READ _IOWR('U', 7, struct usb_fuzzer_ep_io)
#define USB_FUZZER_IOCTL_CONFIGURE _IO('U', 8)
#define USB_FUZZER_IOCTL_VBUS_DRAW _IOW('U', 9, 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_ep0_read(int fd, struct usb_fuzzer_event* event)
{
  return ioctl(fd, USB_FUZZER_IOCTL_EP0_READ, 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_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 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, bool* done)
{
  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 && descs->strs_len > 0) {
          str_idx = descs->strs_len - 1;
        }
        *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;
    case USB_REQ_SET_CONFIGURATION:
      *response_length = 0;
      *response_data = NULL;
      *done = true;
      return true;
    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)
{
  int64_t speed = a0;
  int64_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_ep0_read(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;
    response_found = lookup_connect_response(
        descs, &index, &event.ctrl, &response_data, &response_length, &done);
    if (!response_found) {
      return -1;
    }
    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;
    response.inner.length = response_length;
    if (response_data)
      memcpy(&response.data[0], response_data, response_length);
    if (event.ctrl.wLength < response.inner.length)
      response.inner.length = event.ctrl.wLength;
    rv = usb_fuzzer_ep0_write(fd, (struct usb_fuzzer_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*)0x20000280,
         "\x12\x01\x10\x01\x61\xb2\x13\x10\xf3\x0c\x75\x93\xc1\xf6\x05\x05\xce"
         "\x01\x09\x02\x27\x00\x01\x01\xa9\xf0\x06\x09\x04\x28\x00\x02\x4a\x7d"
         "\x9a\xff\x09\x05\x0b\x00\x7f\x00\x01\xd1\x00\x03\x11\x65\x09\x05\x0b"
         "\x10\x00\x02\xbd\x00\x59\xec\xcc\xc0\xa0\x93\xb4\xa5\x1d\x7e\x59\x4a"
         "\xb7\x85\x05\xcb\x7f\x1a\xa7\x77\xf2\x7d\x22\x45\x45\x15\x84\xba\xc4"
         "\xe2\x01\x06\x43\x06\x47\x32\x47\x9e\xa1\x46\x8d\xb0\x62\x23\x96\x2b"
         "\xc4\x23\x68\x3b\x5a\xa6\x73\xad\x17\x2f\x5b\x30\x42\xab\x04\xc7\x39"
         "\x48\xbb\x01",
         122);
  *(uint32_t*)0x20000240 = 0xa;
  *(uint64_t*)0x20000244 = 0x20000040;
  *(uint8_t*)0x20000040 = 0xa;
  *(uint8_t*)0x20000041 = 6;
  *(uint16_t*)0x20000042 = 0x310;
  *(uint8_t*)0x20000044 = 5;
  *(uint8_t*)0x20000045 = 1;
  *(uint8_t*)0x20000046 = -1;
  *(uint8_t*)0x20000047 = 0x20;
  *(uint8_t*)0x20000048 = 0x81;
  *(uint8_t*)0x20000049 = 0;
  *(uint32_t*)0x2000024c = 0xa2;
  *(uint64_t*)0x20000250 = 0x20000100;
  *(uint8_t*)0x20000100 = 5;
  *(uint8_t*)0x20000101 = 0xf;
  *(uint16_t*)0x20000102 = 0xa2;
  *(uint8_t*)0x20000104 = 2;
  *(uint8_t*)0x20000105 = 0x9a;
  *(uint8_t*)0x20000106 = 0x10;
  *(uint8_t*)0x20000107 = 3;
  memcpy((void*)0x20000108,
         "\x88\x77\x85\x47\xb9\xb9\x40\xad\x24\x95\x50\x46\x79\x73\x4e\x66\x39"
         "\xd1\x3d\xae\x0f\x83\x02\x12\xb7\xc6\xa0\xb4\x2c\xe7\xce\x68\xf8\x57"
         "\x2b\x15\x9a\x9d\x48\x32\xf8\x5a\x64\xf5\x39\x98\x10\x57\xe7\x30\x22"
         "\xf9\x63\x07\x2f\xa9\x7f\x1a\x17\x72\xdc\xaf\x32\x59\xcb\xe4\x2d\x7a"
         "\x9b\xb3\x03\xff\x08\x04\x2b\x6a\x6d\xb2\x78\xba\xaf\xdc\xda\xbe\x1e"
         "\xbb\x2c\x6e\x7c\xf2\xbb\xa5\x96\xb7\x72\x93\xdc\xf5\x52\x01\xd1\xe3"
         "\xa1\x31\x21\x75\xef\x29\xe0\xa0\xca\xa9\x3d\x67\x40\x30\xf1\xf9\x23"
         "\x17\x9e\x09\xf6\x3e\xca\x06\xf6\xbe\xb3\x3c\xb2\x36\x17\x0a\x92\xdc"
         "\x66\x6d\xad\x76\x67\xac\xd2\xef\x16\x99\xb3\xb4\x78\x74\x3d",
         151);
  *(uint8_t*)0x2000019f = 3;
  *(uint8_t*)0x200001a0 = 0x10;
  *(uint8_t*)0x200001a1 = 0xb;
  *(uint32_t*)0x20000258 = 2;
  *(uint32_t*)0x2000025c = 0x7c;
  *(uint64_t*)0x20000260 = 0x200001c0;
  *(uint8_t*)0x200001c0 = 0x7c;
  *(uint8_t*)0x200001c1 = 3;
  *(uint16_t*)0x200001c2 = 0x6c3f;
  memcpy((void*)0x200001c4,
         "\xaf\x71\xbf\x18\xe9\xcd\xab\x6a\x60\xab\x9a\xd8\xef\xa2\x5c\xa7\xe6"
         "\x81\xc4\x43\xd3\x81\x62\xbd\xec\x03\x0a\xcd\x8c\x42\x4a\x35\x91\xeb"
         "\x4f\xac\xd0\x01\xc9\x82\xa5\x73\x37\xc3\x6c\x45\x62\x3e\xb9\xe3\x67"
         "\x83\x9f\x32\xcf\x14\xce\x6d\xd9\x1a\x98\xd9\x0d\x9d\xb0\x8c\x00\x9a"
         "\xb6\x23\x5a\xd8\x1a\x9a\x8e\xc9\x37\xa8\x12\x61\x53\xda\x7e\x21\xba"
         "\x6e\xeb\x2f\xa7\x53\xbd\xb7\x29\x87\xd1\x64\x3c\xbe\xee\xa7\xe1\x12"
         "\x9a\xf7\xa9\x9a\x72\xc9\x4e\x41\x72\x0f\x87\xaf\xf2\xf2\x73\x3b\x06"
         "\x44",
         120);
  *(uint32_t*)0x20000268 = 0x24;
  *(uint64_t*)0x2000026c = 0x20000080;
  *(uint8_t*)0x20000080 = 0x24;
  *(uint8_t*)0x20000081 = 3;
  *(uint16_t*)0x20000082 = 0x1426;
  memcpy((void*)0x20000084, "\x9d\x05\x16\xb3\xf6\xa4\xe3\xd4\x68\x30\xca\xe9"
                            "\x4a\xad\x49\x32\xec\xcc\x6d\x64\xe4\x96\xf7\x31"
                            "\xc5\x7c\xd2\x23\xd4\x23\x8a\xd2",
         32);
  syz_usb_connect(7, 0x39, 0x20000280, 0x20000240);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}