// https://syzkaller.appspot.com/bug?id=af7713629fbe551d065b848548842f4afc48a981
// 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/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>

#ifndef __NR_connect
#define __NR_connect 362
#endif
#ifndef __NR_mkdirat
#define __NR_mkdirat 296
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_mount
#define __NR_mount 21
#endif
#ifndef __NR_openat
#define __NR_openat 295
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#ifndef __NR_write
#define __NR_write 4
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

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;
}

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 (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  mkdirat arguments: [
  //    fd: fd_dir (resource)
  //    path: ptr[in, buffer] {
  //      buffer: {2e 2f 6e 66 73 64 00} (length 0x7)
  //    }
  //    mode: open_mode = 0x1ff (4 bytes)
  //  ]
  memcpy((void*)0x80000040, "./nfsd\000", 7);
  syscall(
      __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x80000040,
      /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
      0x1ff);
  //  socket$inet_udp arguments: [
  //    domain: const = 0x2 (4 bytes)
  //    type: const = 0x2 (4 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_udp
  syscall(__NR_socket, /*domain=*/2, /*type=*/2, /*proto=*/0);
  //  mount arguments: [
  //    src: nil
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 2f 6e 66 73 64 00} (length 0x7)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {6e 66 73 64 00} (length 0x5)
  //    }
  //    flags: mount_flags = 0x0 (4 bytes)
  //    data: nil
  //  ]
  memcpy((void*)0x800000c0, "./nfsd\000", 7);
  memcpy((void*)0x80000100, "nfsd\000", 5);
  syscall(__NR_mount, /*src=*/0, /*dst=*/0x800000c0, /*type=*/0x80000100,
          /*flags=*/0, /*data=*/0);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 6e 66 73 64 2f 70 6f 72 74 6c 69 73 74 00} (length
  //      0x10)
  //    }
  //    flags: open_flags = 0x1 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x80000200, "./nfsd/portlist\000", 16);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x80000200,
                /*flags=O_WRONLY*/ 1, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  write arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {33} (length 0x1)
  //    }
  //    count: len = 0x1 (4 bytes)
  //  ]
  memset((void*)0x80000240, 51, 1);
  syscall(__NR_write, /*fd=*/(intptr_t)r[0], /*buf=*/0x80000240, /*count=*/1);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 6e 66 73 64 2f 76 65 72 73 69 6f 6e 73 00} (length
  //      0x10)
  //    }
  //    flags: open_flags = 0x1 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x80000180, "./nfsd/versions\000", 16);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x80000180,
                /*flags=O_WRONLY*/ 1, /*mode=*/0);
  if (res != -1)
    r[1] = res;
  //  write arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {2d 32 20 2d 33 0a} (length 0x6)
  //    }
  //    count: len = 0x6 (4 bytes)
  //  ]
  memcpy((void*)0x800001c0, "-2 -3\n", 6);
  syscall(__NR_write, /*fd=*/(intptr_t)r[1], /*buf=*/0x800001c0, /*count=*/6);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 6e 66 73 64 2f 70 6f 72 74 6c 69 73 74 00} (length
  //      0x10)
  //    }
  //    flags: open_flags = 0x1 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x80000200, "./nfsd/portlist\000", 16);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x80000200,
                /*flags=O_WRONLY*/ 1, /*mode=*/0);
  if (res != -1)
    r[2] = res;
  //  write arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {33} (length 0x1)
  //    }
  //    count: len = 0x1 (4 bytes)
  //  ]
  memset((void*)0x80000240, 51, 1);
  syscall(__NR_write, /*fd=*/(intptr_t)r[2], /*buf=*/0x80000240, /*count=*/1);
  //  connect$inet arguments: [
  //    fd: sock_in (resource)
  //    addr: ptr[in, sockaddr_in] {
  //      sockaddr_in {
  //        family: const = 0x2 (2 bytes)
  //        port: int16be = 0x4e20 (2 bytes)
  //        addr: union ipv4_addr {
  //          dev: ipv4_addr_t[netdev_addr_id] {
  //            a0: const = 0xac (1 bytes)
  //            a1: const = 0x14 (1 bytes)
  //            a2: const = 0x14 (1 bytes)
  //            a3: int8 = 0x18 (1 bytes)
  //          }
  //        }
  //        pad = 0x0 (8 bytes)
  //      }
  //    }
  //    addrlen: len = 0x10 (4 bytes)
  //  ]
  *(uint16_t*)0x80000000 = 2;
  *(uint16_t*)0x80000002 = htobe16(0x4e20);
  *(uint8_t*)0x80000004 = 0xac;
  *(uint8_t*)0x80000005 = 0x14;
  *(uint8_t*)0x80000006 = 0x14;
  *(uint8_t*)0x80000007 = 0x18;
  syscall(__NR_connect, /*fd=*/(intptr_t)-1, /*addr=*/0x80000000,
          /*addrlen=*/0x10);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x7ffff000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x80000000, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x81000000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}