// https://syzkaller.appspot.com/bug?id=ae28a692910f2e066889b98c890adc67d88a4fda
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <sys/types.h>

#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/endian.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#ifndef SYS_inotify_add_watch_at
#define SYS_inotify_add_watch_at 593
#endif

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

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 void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      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)) {
  }
  //  rfork arguments: [
  //    flags: rfork_flags = 0x85000 (8 bytes)
  //  ]
  syscall(SYS_rfork, /*flags=RFTSIGZMB|RFSIGSHARE|RFCFDG*/ 0x85000ul);
  //  openat$bpf arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 62 70 66 00} (length 0x9)
  //    }
  //    flags: open_flags = 0x1 (8 bytes)
  //    mode: const = 0x0 (8 bytes)
  //  ]
  //  returns fd_bpf
  memcpy((void*)0x200000000000, "/dev/bpf\000", 9);
  res =
      syscall(SYS_openat, /*fd=*/0xffffffffffffff9cul,
              /*file=*/0x200000000000ul, /*flags=O_WRONLY*/ 1ul, /*mode=*/0ul);
  if (res != -1)
    r[0] = res;
  //  ioctl$BIOCSETF arguments: [
  //    fd: fd_bpf (resource)
  //    cmd: const = 0x80104267 (8 bytes)
  //    arg: nil
  //  ]
  syscall(SYS_ioctl, /*fd=*/r[0], /*cmd=*/0x80104267ul, /*arg=*/0ul);
  //  sysarch$I386_GET_IOPERM arguments: [
  //    cmd: const = 0x3 (8 bytes)
  //    args: nil
  //  ]
  syscall(SYS_sysarch, /*cmd=*/3ul, /*args=*/0ul);
  //  socket$inet6_udp arguments: [
  //    domain: const = 0x1c (8 bytes)
  //    type: const = 0x2 (8 bytes)
  //    proto: const = 0x0 (1 bytes)
  //  ]
  //  returns sock_udp6
  res = syscall(SYS_socket, /*domain=*/0x1cul, /*type=*/2ul, /*proto=*/0);
  if (res != -1)
    r[1] = res;
  //  setsockopt$inet6_IPV6_DSTOPTS arguments: [
  //    fd: sock_in6 (resource)
  //    level: const = 0x29 (4 bytes)
  //    optname: const = 0x32 (4 bytes)
  //    optval: ptr[inout, array[ANYUNION]] {
  //      array[ANYUNION] {
  //      }
  //    }
  //    optlen: len = 0x8 (8 bytes)
  //  ]
  syscall(SYS_setsockopt, /*fd=*/r[1], /*level=*/0x29, /*optname=*/0x32,
          /*optval=*/0x200000000300ul, /*optlen=*/8ul);
  //  mprotect arguments: [
  //    addr: VMA[0x800000]
  //    len: len = 0x800000 (8 bytes)
  //    prot: mmap_prot = 0x5 (8 bytes)
  //  ]
  syscall(SYS_mprotect, /*addr=*/0x200000000000ul, /*len=*/0x800000ul,
          /*prot=PROT_READ|PROT_EXEC*/ 5ul);
  //  inotify_add_watch_at arguments: [
  //    fd: fd_inotify (resource)
  //    dfd: fd_dir (resource)
  //    file: nil
  //    mask: inotify_mask = 0x2000000 (8 bytes)
  //  ]
  //  returns inotifydesc
  syscall(SYS_inotify_add_watch_at, /*fd=*/(intptr_t)-1, /*dfd=*/(intptr_t)-1,
          /*file=*/0ul, /*mask=IN_DONT_FOLLOW*/ 0x2000000ul);
  //  getsockopt$inet6_buf arguments: [
  //    fd: sock_in6 (resource)
  //    level: const = 0x29 (4 bytes)
  //    optname: inet6_option_types_buf = 0x32 (4 bytes)
  //    optval: ptr[out, buffer] {
  //      buffer: (DirOut)
  //    }
  //    optlen: ptr[inout, len] {
  //      len = 0x1000 (4 bytes)
  //    }
  //  ]
  *(uint32_t*)0x200000000000 = 0x1000;
  syscall(SYS_getsockopt, /*fd=*/r[1], /*level=*/0x29,
          /*optname=IPV6_DSTOPTS*/ 0x32, /*optval=*/0x200000001040ul,
          /*optlen=*/0x200000000000ul);
}
int main(void)
{
  syscall(SYS_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}