// https://syzkaller.appspot.com/bug?id=7da74c5a75a1d5521547d6fbb22f65a7c7d3b89f
// 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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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>

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;
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;
  size_t i = 0;
  for (; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];
  if (length & 1)
    csum->acc += le16toh((uint16_t)data[length - 1]);
  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

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;
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int 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 = 0;
  for (;; 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 < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x20000000, "/dev/net/tun\000", 13);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000000ul,
                /*flags=*/0x40241ul, /*mode=*/0ul);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20000200, "syzkaller1\000\000\000\000\000\000", 16);
  *(uint16_t*)0x20000210 = 0xc201;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x400454ca, /*arg=*/0x20000200ul);
  res = syscall(__NR_socket, /*domain=*/2ul, /*type=*/0xaul, /*proto=*/2);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x20000180, "syzkaller1\000\000\000\000\000\000", 16);
  *(uint8_t*)0x20000190 = 1;
  *(uint8_t*)0x20000191 = 0x80;
  *(uint8_t*)0x20000192 = 0xc2;
  *(uint8_t*)0x20000193 = 0;
  *(uint8_t*)0x20000194 = 0;
  *(uint8_t*)0x20000195 = 0;
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x8914, /*arg=*/0x20000180ul);
  *(uint16_t*)0x20002300 = 0;
  *(uint16_t*)0x20002302 = htobe16(0x11);
  *(uint8_t*)0x20002304 = 0;
  *(uint8_t*)0x20002305 = 0;
  *(uint16_t*)0x20002306 = 0;
  *(uint16_t*)0x20002308 = 0;
  *(uint16_t*)0x2000230a = 0;
  *(uint16_t*)0x2000230c = 0;
  STORE_BY_BITMASK(uint8_t, , 0x2000230e, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x2000230e, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x2000230f, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, , 0x2000230f, 0, 2, 6);
  *(uint16_t*)0x20002310 = htobe16(0x58);
  *(uint16_t*)0x20002312 = htobe16(0);
  *(uint16_t*)0x20002314 = htobe16(0);
  *(uint8_t*)0x20002316 = 0;
  *(uint8_t*)0x20002317 = 0x2f;
  *(uint16_t*)0x20002318 = htobe16(0);
  *(uint32_t*)0x2000231a = htobe32(0);
  *(uint8_t*)0x2000231e = 0xac;
  *(uint8_t*)0x2000231f = 0x1e;
  *(uint8_t*)0x20002320 = 0;
  *(uint8_t*)0x20002321 = 1;
  STORE_BY_BITMASK(uint16_t, , 0x20002322, 0, 0, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20002322, 0, 1, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20002322, 1, 2, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20002322, 0, 3, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20002322, 0, 4, 4);
  STORE_BY_BITMASK(uint16_t, , 0x20002323, 0, 0, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20002323, 0, 1, 4);
  STORE_BY_BITMASK(uint16_t, , 0x20002323, 1, 5, 3);
  *(uint16_t*)0x20002324 = htobe16(0x880b);
  *(uint16_t*)0x20002326 = htobe16(0);
  *(uint16_t*)0x20002328 = htobe16(0);
  STORE_BY_BITMASK(uint16_t, , 0x2000232a, 0, 0, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000232a, 0, 1, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000232a, 0, 2, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000232a, 0, 3, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000232a, 0, 4, 9);
  STORE_BY_BITMASK(uint16_t, , 0x2000232b, 0, 5, 3);
  *(uint16_t*)0x2000232c = htobe16(0x800);
  STORE_BY_BITMASK(uint16_t, , 0x2000232e, 0, 0, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000232e, 0, 1, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000232e, 0, 2, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000232e, 0, 3, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000232e, 0, 4, 9);
  STORE_BY_BITMASK(uint16_t, , 0x2000232f, 0, 5, 3);
  *(uint16_t*)0x20002330 = htobe16(0x86dd);
  *(uint16_t*)0x20002332 = 8;
  *(uint16_t*)0x20002334 = htobe16(0x88be);
  *(uint32_t*)0x20002336 = htobe32(0);
  STORE_BY_BITMASK(uint8_t, , 0x2000233a, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x2000233a, 1, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x2000233b, 0, 0, 8);
  STORE_BY_BITMASK(uint8_t, , 0x2000233c, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, , 0x2000233c, 0, 2, 1);
  STORE_BY_BITMASK(uint8_t, , 0x2000233c, 0, 3, 2);
  STORE_BY_BITMASK(uint8_t, , 0x2000233c, 0, 5, 3);
  STORE_BY_BITMASK(uint8_t, , 0x2000233d, 0, 0, 8);
  *(uint32_t*)0x2000233e = 1;
  *(uint32_t*)0x20002342 = htobe32(0);
  *(uint16_t*)0x20002346 = 8;
  *(uint16_t*)0x20002348 = htobe16(0x22eb);
  *(uint32_t*)0x2000234a = htobe32(0);
  STORE_BY_BITMASK(uint8_t, , 0x2000234e, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x2000234e, 2, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x2000234f, 0, 0, 8);
  STORE_BY_BITMASK(uint8_t, , 0x20002350, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, , 0x20002350, 0, 2, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20002350, 0, 3, 2);
  STORE_BY_BITMASK(uint8_t, , 0x20002350, 0, 5, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20002351, 0, 0, 8);
  *(uint32_t*)0x20002352 = 2;
  *(uint32_t*)0x20002356 = htobe32(0);
  *(uint16_t*)0x2000235a = htobe16(0);
  STORE_BY_BITMASK(uint8_t, , 0x2000235c, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, , 0x2000235c, 0, 2, 5);
  STORE_BY_BITMASK(uint8_t, , 0x2000235c, 0, 7, 1);
  STORE_BY_BITMASK(uint8_t, , 0x2000235d, 0, 0, 1);
  STORE_BY_BITMASK(uint8_t, , 0x2000235d, 0, 1, 2);
  STORE_BY_BITMASK(uint8_t, , 0x2000235d, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x2000235d, 0, 4, 1);
  *(uint16_t*)0x2000235e = 8;
  *(uint16_t*)0x20002360 = htobe16(0x6558);
  *(uint32_t*)0x20002362 = htobe32(0);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x2000230e, 20);
  *(uint16_t*)0x20002318 = csum_inet_digest(&csum_1);
  syscall(__NR_write, /*fd=*/r[0], /*buf=*/0x20002300ul, /*count=*/0x66ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  loop();
  return 0;
}