// https://syzkaller.appspot.com/bug?id=b53d789b93ee44038efb6c5619d323e9ea8df76a
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#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/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

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;
}

const int kInitNetNsFd = 201;

static long syz_open_pts(volatile long a0, volatile long a1)
{
  int ptyno = 0;
  if (ioctl(a0, TIOCGPTN, &ptyno))
    return -1;
  char buf[128];
  sprintf(buf, "/dev/pts/%d", ptyno);
  return open(buf, a1, 0);
}

static long syz_init_net_socket(volatile long domain, volatile long type,
                                volatile long proto)
{
  return syscall(__NR_socket, domain, type, proto);
}

static void setup_sysctl()
{
  int cad_pid = fork();
  if (cad_pid < 0)
    exit(1);
  if (cad_pid == 0) {
    for (;;)
      sleep(100);
  }
  char tmppid[32];
  snprintf(tmppid, sizeof(tmppid), "%d", cad_pid);
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/sys/kernel/debug/failslab/task-filter", "Y"},
      {"/sys/kernel/debug/fail_page_alloc/task-filter", "Y"},
      {"/sys/kernel/debug/fail_futex/task-filter", "Y"},
      {"/sys/kernel/debug/fail_usercopy/task-filter", "Y"},
      {"/sys/kernel/debug/fail_make_request/task-filter", "Y"},
      {"/sys/kernel/debug/fail_io_timeout/task-filter", "Y"},
      {"/sys/kernel/debug/fail_iommufd/task-filter", "Y"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", tmppid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data)) {
    }
  }
  kill(cad_pid, SIGKILL);
  while (waitpid(cad_pid, NULL, 0) != cad_pid)
    ;
}

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

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*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=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  setup_sysctl();
  const char* reason;
  (void)reason;
  use_temporary_dir();
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$ptmx arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 70 74 6d 78 00} (length 0xa)
  //    }
  //    flags: open_flags = 0x2 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_tty
  memcpy((void*)0x200000000040, "/dev/ptmx\000", 10);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x200000000040ul, /*flags=O_RDWR*/ 2, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  ioctl$TIOCSPTLCK arguments: [
  //    fd: fd_tty (resource)
  //    cmd: const = 0x40045431 (4 bytes)
  //    arg: ptr[in, int32] {
  //      int32 = 0x0 (4 bytes)
  //    }
  //  ]
  *(uint32_t*)0x200000000080 = 0;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x40045431,
          /*arg=*/0x200000000080ul);
  //  syz_open_pts arguments: [
  //    fd: fd_tty (resource)
  //    flags: open_flags = 0x2 (8 bytes)
  //  ]
  //  returns fd_tty
  res = -1;
  res = syz_open_pts(/*fd=*/r[0], /*flags=O_RDWR*/ 2);
  if (res != -1)
    r[1] = res;
  //  ioctl$TIOCSETD arguments: [
  //    fd: fd_tty (resource)
  //    cmd: const = 0x5423 (4 bytes)
  //    arg: ptr[in, int32] {
  //      int32 = 0x11 (4 bytes)
  //    }
  //  ]
  *(uint32_t*)0x200000000100 = 0x11;
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x5423, /*arg=*/0x200000000100ul);
  //  syz_init_net_socket$llc arguments: [
  //    domain: const = 0x1a (8 bytes)
  //    type: llc_socket_type = 0x2 (8 bytes)
  //    proto: const = 0x0 (8 bytes)
  //  ]
  //  returns sock_llc
  res = -1;
  res =
      syz_init_net_socket(/*domain=*/0x1a, /*type=SOCK_DGRAM*/ 2, /*proto=*/0);
  if (res != -1)
    r[2] = res;
  //  ioctl arguments: [
  //    fd: fd (resource)
  //    cmd: int32 = 0x8914 (4 bytes)
  //    arg: ptr[in, buffer] {
  //      buffer: {63 61 6e 30 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00
  //      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00} (length
  //      0x28)
  //    }
  //  ]
  memcpy((void*)0x200000000200,
         "\x63\x61\x6e\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00",
         40);
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x8914, /*arg=*/0x200000000200ul);
  //  write arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {65 31 61 0d} (length 0x4)
  //    }
  //    count: len = 0x4 (8 bytes)
  //  ]
  memcpy((void*)0x200000000300, "e1a\r", 4);
  syscall(__NR_write, /*fd=*/r[0], /*buf=*/0x200000000300ul, /*count=*/4ul);
  return 0;
}