// https://syzkaller.appspot.com/bug?id=af3a0728c8cbf6903ec2b0836441287cced00c1c
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <linux/loop.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/stat.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  struct sigaction sa;

  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

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

extern unsigned long long procid;

struct fs_image_segment {
  void* data;
  uintptr_t size;
  uintptr_t offset;
};

#define IMAGE_MAX_SEGMENTS 4096
#define IMAGE_MAX_SIZE (129 << 20)

#define SYZ_memfd_create 319

static uintptr_t syz_read_part_table(uintptr_t size, uintptr_t nsegs,
                                     uintptr_t segments)
{
  char loopname[64], linkname[64];
  int loopfd, err = 0, res = -1;
  uintptr_t i, j;
  struct fs_image_segment* segs = (struct fs_image_segment*)segments;

  if (nsegs > IMAGE_MAX_SEGMENTS)
    nsegs = IMAGE_MAX_SEGMENTS;
  for (i = 0; i < nsegs; i++) {
    if (segs[i].size > IMAGE_MAX_SIZE)
      segs[i].size = IMAGE_MAX_SIZE;
    segs[i].offset %= IMAGE_MAX_SIZE;
    if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size)
      segs[i].offset = IMAGE_MAX_SIZE - segs[i].size;
    if (size < segs[i].offset + segs[i].offset)
      size = segs[i].offset + segs[i].offset;
  }
  if (size > IMAGE_MAX_SIZE)
    size = IMAGE_MAX_SIZE;
  int memfd = syscall(SYZ_memfd_create, "syz_read_part_table", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (ftruncate(memfd, size)) {
    err = errno;
    goto error_close_memfd;
  }
  for (i = 0; i < nsegs; i++) {
    if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) {
    }
  }
  snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
  loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    err = errno;
    goto error_close_memfd;
  }
  if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
    if (errno != EBUSY) {
      err = errno;
      goto error_close_loop;
    }
    ioctl(loopfd, LOOP_CLR_FD, 0);
    usleep(1000);
    if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
      err = errno;
      goto error_close_loop;
    }
  }
  struct loop_info64 info;
  if (ioctl(loopfd, LOOP_GET_STATUS64, &info)) {
    err = errno;
    goto error_clear_loop;
  }
  info.lo_flags |= LO_FLAGS_PARTSCAN;
  if (ioctl(loopfd, LOOP_SET_STATUS64, &info)) {
    err = errno;
    goto error_clear_loop;
  }
  res = 0;
  for (i = 1, j = 0; i < 8; i++) {
    snprintf(loopname, sizeof(loopname), "/dev/loop%llup%d", procid, (int)i);
    struct stat statbuf;
    if (stat(loopname, &statbuf) == 0) {
      snprintf(linkname, sizeof(linkname), "./file%d", (int)j++);
      if (symlink(loopname, linkname)) {
      }
    }
  }
error_clear_loop:
  ioctl(loopfd, LOOP_CLR_FD, 0);
error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return res;
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 160 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

int wait_for_loop(int pid)
{
  if (pid < 0)
    fail("sandbox fork failed");
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  loop();
  doexit(1);
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (__atomic_load_n(&running, __ATOMIC_RELAXED))
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

uint64_t r[6] = {
    0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0x0,
    0xffffffffffffffff};
unsigned long long procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    NONFAILING(memcpy((void*)0x20000000, "/dev/full", 10));
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000000, 0x28000, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    syscall(__NR_ioctl, r[0], 0x4b34, 0x401);
    break;
  case 2:
    syscall(__NR_ioctl, r[0], 0x4b65, 0x2000000000);
    break;
  case 3:
    res = syscall(__NR_socketpair, 9, 0x800, 2, 0x20000040);
    if (res != -1) {
      NONFAILING(r[1] = *(uint32_t*)0x20000040);
      NONFAILING(r[2] = *(uint32_t*)0x20000044);
    }
    break;
  case 4:
    syscall(__NR_ioctl, r[0], 0x4b64, 0x20000080);
    break;
  case 5:
    NONFAILING(memcpy(
        (void*)0x200000c0,
        "\x69\x13\x10\x66\x7b\xe5\xef\x88\x6a\x50\xc5\xd3\xc1\xfc\x67\x2e",
        16));
    syscall(__NR_setsockopt, r[0], 6, 0x21, 0x200000c0, 0x10);
    break;
  case 6:
    NONFAILING(memcpy((void*)0x20000100, "./file0", 8));
    syscall(__NR_readlink, 0x20000100, 0x20000140, 0x1000);
    break;
  case 7:
    NONFAILING(*(uint32_t*)0x20001180 = 0x14);
    syscall(__NR_getsockopt, r[2], 6, 0x1d, 0x20001140, 0x20001180);
    break;
  case 8:
    NONFAILING(*(uint32_t*)0x200011c0 = 0xf7);
    syscall(__NR_ioctl, r[1], 0x5418, 0x200011c0);
    break;
  case 9:
    syscall(__NR_ioctl, r[1], 0x4b65, 0x3f);
    break;
  case 10:
    syscall(__NR_ioctl, r[0], 0x4b30, 7);
    break;
  case 11:
    syscall(__NR_flistxattr, r[1], 0x20001200, 0x1000);
    break;
  case 12:
    res = syscall(__NR_semget, 0, 0, 0x20);
    if (res != -1)
      r[3] = res;
    break;
  case 13:
    NONFAILING(*(uint16_t*)0x20002200 = 0x3f);
    NONFAILING(*(uint16_t*)0x20002202 = 1);
    NONFAILING(*(uint16_t*)0x20002204 = 4);
    syscall(__NR_semctl, r[3], 0, 0x11, 0x20002200);
    break;
  case 14:
    syscall(__NR_ioctl, r[1], 0x4b64, 0x20002240);
    break;
  case 15:
    NONFAILING(memcpy((void*)0x20002280, "./file1", 8));
    NONFAILING(memcpy((void*)0x200022c0, "./file0", 8));
    syscall(__NR_symlink, 0x20002280, 0x200022c0);
    break;
  case 16:
    NONFAILING(*(uint64_t*)0x20003740 = 0x20002300);
    NONFAILING(*(uint64_t*)0x20003748 = 0);
    NONFAILING(*(uint64_t*)0x20003750 = 1);
    NONFAILING(*(uint64_t*)0x20003758 = 0x200023c0);
    NONFAILING(*(uint64_t*)0x20003760 = 0);
    NONFAILING(*(uint64_t*)0x20003768 = 0x8000);
    NONFAILING(*(uint64_t*)0x20003770 = 0x20002440);
    NONFAILING(*(uint64_t*)0x20003778 = 0);
    NONFAILING(*(uint64_t*)0x20003780 = 3);
    NONFAILING(*(uint64_t*)0x20003788 = 0x200024c0);
    NONFAILING(*(uint64_t*)0x20003790 = 0);
    NONFAILING(*(uint64_t*)0x20003798 = 0x1f);
    NONFAILING(*(uint64_t*)0x200037a0 = 0x20002540);
    NONFAILING(*(uint64_t*)0x200037a8 = 0);
    NONFAILING(*(uint64_t*)0x200037b0 = 0x10000);
    NONFAILING(*(uint64_t*)0x200037b8 = 0x20002640);
    NONFAILING(*(uint64_t*)0x200037c0 = 0);
    NONFAILING(*(uint64_t*)0x200037c8 = 0xfffffffffffffff9);
    NONFAILING(*(uint64_t*)0x200037d0 = 0x20003640);
    NONFAILING(*(uint64_t*)0x200037d8 = 0);
    NONFAILING(*(uint64_t*)0x200037e0 = 0xffffffffffffff01);
    syz_read_part_table(0x5f27ecd0, 7, 0x20003740);
    break;
  case 17:
    res = syscall(__NR_ioctl, r[1], 0x8904, 0x20003800);
    if (res != -1)
      NONFAILING(r[4] = *(uint32_t*)0x20003800);
    break;
  case 18:
    syscall(__NR_fcntl, r[0], 8, r[4]);
    break;
  case 19:
    syscall(__NR_ioctl, r[0], 0x5428);
    break;
  case 20:
    NONFAILING(*(uint16_t*)0x20003840 = 0);
    NONFAILING(*(uint16_t*)0x20003842 = 9);
    NONFAILING(*(uint16_t*)0x20003844 = 1);
    syscall(__NR_ioctl, r[1], 0x5609, 0x20003840);
    break;
  case 21:
    NONFAILING(memcpy((void*)0x20003880, "/dev/ptmx", 10));
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20003880, 0x40000, 0);
    if (res != -1)
      r[5] = res;
    break;
  case 22:
    syscall(__NR_read, r[5], 0x200038c0, 0x83);
    break;
  }
}

void loop()
{
  execute(23);
  collide = 1;
  execute(23);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  use_temporary_dir();
  do_sandbox_none();
  return 0;
}