// https://syzkaller.appspot.com/bug?id=32138d305228021f6e5d00db0a1e24281edcb9d7
// 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_bind
#define __NR_bind 200
#endif
#ifndef __NR_connect
#define __NR_connect 203
#endif
#ifndef __NR_listen
#define __NR_listen 201
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_sendto
#define __NR_sendto 206
#endif
#ifndef __NR_setsockopt
#define __NR_setsockopt 208
#endif
#ifndef __NR_socket
#define __NR_socket 198
#endif
#ifndef __NR_write
#define __NR_write 64
#endif

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

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  socket$inet6 arguments: [
  //    domain: const = 0xa (8 bytes)
  //    type: socket_type = 0x6 (8 bytes)
  //    proto: int32 = 0x0 (4 bytes)
  //  ]
  //  returns sock_in6
  res = syscall(__NR_socket, /*domain=*/0xaul, /*type=SOCK_DCCP*/ 6ul,
                /*proto=*/0);
  if (res != -1)
    r[0] = res;
  //  bind$inet6 arguments: [
  //    fd: sock_in6 (resource)
  //    addr: ptr[in, sockaddr_in6] {
  //      sockaddr_in6 {
  //        family: const = 0xa (2 bytes)
  //        port: int16be = 0x4e20 (2 bytes)
  //        flow: int32be = 0x0 (4 bytes)
  //        addr: union ipv6_addr {
  //          rand_addr: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00} (length 0x10)
  //        }
  //        scope: int32 = 0x0 (4 bytes)
  //      }
  //    }
  //    addrlen: len = 0x1c (8 bytes)
  //  ]
  *(uint16_t*)0x20000000 = 0xa;
  *(uint16_t*)0x20000002 = htobe16(0x4e20);
  *(uint32_t*)0x20000004 = htobe32(0);
  memset((void*)0x20000008, 0, 16);
  *(uint32_t*)0x20000018 = 0;
  syscall(__NR_bind, /*fd=*/r[0], /*addr=*/0x20000000ul, /*addrlen=*/0x1cul);
  //  listen arguments: [
  //    fd: sock (resource)
  //    backlog: int32 = 0x101 (4 bytes)
  //  ]
  syscall(__NR_listen, /*fd=*/r[0], /*backlog=*/0x101);
  //  socket$inet_dccp arguments: [
  //    domain: const = 0x2 (8 bytes)
  //    type: const = 0x6 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_dccp
  res = syscall(__NR_socket, /*domain=*/2ul, /*type=*/6ul, /*proto=*/0);
  if (res != -1)
    r[1] = res;
  //  setsockopt arguments: [
  //    fd: sock (resource)
  //    level: int32 = 0x10d (4 bytes)
  //    optname: int32 = 0x800000000d (4 bytes)
  //    optval: ptr[in, buffer] {
  //      buffer: {03} (length 0x1)
  //    }
  //    optlen: len = 0x1 (8 bytes)
  //  ]
  memset((void*)0x201c9fff, 3, 1);
  syscall(__NR_setsockopt, /*fd=*/r[1], /*level=*/0x10d, /*optname=*/0xd,
          /*optval=*/0x201c9ffful, /*optlen=*/1ul);
  //  connect$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 {
  //          loopback: const = 0x7f000001 (4 bytes)
  //        }
  //        pad = 0x0 (8 bytes)
  //      }
  //    }
  //    addrlen: len = 0x10 (8 bytes)
  //  ]
  *(uint16_t*)0x20000080 = 2;
  *(uint16_t*)0x20000082 = htobe16(0x4e20);
  *(uint32_t*)0x20000084 = htobe32(0x7f000001);
  syscall(__NR_connect, /*fd=*/r[1], /*addr=*/0x20000080ul, /*addrlen=*/0x10ul);
  //  write$binfmt_script arguments: [
  //    fd: fd_binfmt (resource)
  //    data: ptr[in, binfmt_script] {
  //      binfmt_script {
  //        hdr: buffer: {23 21 20} (length 0x3)
  //        bin: buffer: {2e 2f 66 69 6c 65 30} (length 0x7)
  //        args: array[binfmt_script_arg] {
  //        }
  //        nl: const = 0xa (1 bytes)
  //        data: buffer: {} (length 0x0)
  //      }
  //    }
  //    len: bytesize = 0xb (8 bytes)
  //  ]
  memcpy((void*)0x200000c0, "#! ", 3);
  memcpy((void*)0x200000c3, "./file0", 7);
  *(uint8_t*)0x200000ca = 0xa;
  syscall(__NR_write, /*fd=*/r[1], /*data=*/0x200000c0ul, /*len=*/0xbul);
  for (int i = 0; i < 64; i++) {
    syscall(__NR_write, /*fd=*/r[1], /*data=*/0x200000c0ul, /*len=*/0xbul);
  }
  //  sendto$inet arguments: [
  //    fd: sock_in (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {2b} (length 0x1)
  //    }
  //    len: len = 0x1 (8 bytes)
  //    f: send_flags = 0x0 (8 bytes)
  //    addr: nil
  //    addrlen: len = 0x0 (8 bytes)
  //  ]
  memset((void*)0x20000780, 43, 1);
  syscall(__NR_sendto, /*fd=*/r[1], /*buf=*/0x20000780ul, /*len=*/1ul,
          /*f=*/0ul, /*addr=*/0ul, /*addrlen=*/0ul);
  for (int i = 0; i < 64; i++) {
    syscall(__NR_sendto, /*fd=*/r[1], /*buf=*/0x20000780ul, /*len=*/1ul,
            /*f=*/0ul, /*addr=*/0ul, /*addrlen=*/0ul);
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}