// https://syzkaller.appspot.com/bug?id=48657bf50b05ace29c310fc9c45915d7e4a7b4b0
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.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 <unistd.h>

#include <linux/loop.h>

static unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

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;
}

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

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

#define sys_memfd_create 319

static unsigned long fs_image_segment_check(unsigned long size,
                                            unsigned long nsegs,
                                            struct fs_image_segment* segs)
{
  if (nsegs > IMAGE_MAX_SEGMENTS)
    nsegs = IMAGE_MAX_SEGMENTS;
  for (size_t 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;
  return size;
}
static int setup_loop_device(long unsigned size, long unsigned nsegs,
                             struct fs_image_segment* segs,
                             const char* loopname, int* memfd_p, int* loopfd_p)
{
  int err = 0, loopfd = -1;
  size = fs_image_segment_check(size, nsegs, segs);
  int memfd = syscall(sys_memfd_create, "syzkaller", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (ftruncate(memfd, size)) {
    err = errno;
    goto error_close_memfd;
  }
  for (size_t i = 0; i < nsegs; i++) {
    if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) {
    }
  }
  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;
    }
  }
  *memfd_p = memfd;
  *loopfd_p = loopfd;
  return 0;

error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return -1;
}

static long syz_mount_image(volatile long fsarg, volatile long dir,
                            volatile unsigned long size,
                            volatile unsigned long nsegs,
                            volatile long segments, volatile long flags,
                            volatile long optsarg)
{
  struct fs_image_segment* segs = (struct fs_image_segment*)segments;
  int res = -1, err = 0, loopfd = -1, memfd = -1, need_loop_device = !!segs;
  char* mount_opts = (char*)optsarg;
  char* target = (char*)dir;
  char* fs = (char*)fsarg;
  char* source = NULL;
  char loopname[64];
  if (need_loop_device) {
    memset(loopname, 0, sizeof(loopname));
    snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
    if (setup_loop_device(size, nsegs, segs, loopname, &memfd, &loopfd) == -1)
      return -1;
    source = loopname;
  }
  mkdir(target, 0777);
  char opts[256];
  memset(opts, 0, sizeof(opts));
  if (strlen(mount_opts) > (sizeof(opts) - 32)) {
  }
  strncpy(opts, mount_opts, sizeof(opts) - 32);
  if (strcmp(fs, "iso9660") == 0) {
    flags |= MS_RDONLY;
  } else if (strncmp(fs, "ext", 3) == 0) {
    if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0)
      strcat(opts, ",errors=continue");
  } else if (strcmp(fs, "xfs") == 0) {
    strcat(opts, ",nouuid");
  }
  res = mount(source, target, fs, flags, opts);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  res = open(target, O_RDONLY | O_DIRECTORY);
  if (res == -1) {
    err = errno;
  }

error_clear_loop:
  if (need_loop_device) {
    ioctl(loopfd, LOOP_CLR_FD, 0);
    close(loopfd);
    close(memfd);
  }
  errno = err;
  return res;
}

static void setup_sysctl()
{
  static 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_enable", "1"},
      {"/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/net/ipv4/ping_group_range", "0 65535"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/nr_overcommit_hugepages", "4"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data))
      printf("write to %s failed: %s\n", files[i].name, strerror(errno));
  }
}

uint64_t r[1] = {0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  setup_sysctl();
  install_segv_handler();
  use_temporary_dir();
  intptr_t res = 0;
  NONFAILING(*(uint32_t*)0x20000380 = -1);
  NONFAILING(memcpy(
      (void*)0x20000388,
      "\xb1\x35\x47\x0b\x7a\xd3\x95\xaa\xde\xdb\x17\x43\xa2\x12\x92\xcf\xe9\xd6"
      "\x56\x31\xe4\xc2\xbe\xbe\xd4\xd4\xb5\x52\x28\x57\x17\xe7\x11\xcb\x87\x3f"
      "\x6d\x6c\x41\x69\x63\x8d\x51\xe6\x3c\xfd\x5f\xb9\xf9\x5f\x0c\xdb\xd3\xfc"
      "\x3c\xca\xcf\xbc\x47\x1e\x19\xaa\x03\xb8\xb3\xeb\x51\x73\x2e\x95\x9a\x35"
      "\x3b\x49\x8e\x96\x2f\xa4\xa2\xb4\x19\xa5\xd9\x9f\xad\x90\x86\xd5\xd7\xf7"
      "\xe2\xd0\x95\x1d\x39\x59\x41\xed\x61\x13\x25\x2f\xd4\x15\xcd\x2f\x41\xb2"
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      "\xdd\x19\xe4\x6e\x0c\x26\xed\x39\x2d\x47\xaa\x21\xe5\xa1\x97\x47\xcd\x9f"
      "\x05\xdc\xbd\xec\x17\x30\x0c\xe8\x09\xf7\x93\x72\x0e\x95\x15\xe4\x94\x93"
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      "\x05\xc1\x5e\xbd\x6b\x18\xc3\x6f\x60\x29\xe0\x9f\x19\x5c\x4e\xd9\xd8\x56"
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      "\x39\xdb\xad\x66\xb9\x56\x27\xc0\xf4\x9c\xd1\xf4\x91\xe0\x45\x23\xe6\xbb"
      "\x7b\xa4\x20\x35\x0e\xfd\xa1\x5a\xaa\x74\x0b\x9c\x8b\x80\x66\x86\x98\x35"
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      "\x91\x96\xa4\xf1\x37\xd7\x3b\x7c\x97\xb9\xf2\x09\xa3\x6b\x95\xb9\x11\x3d"
      "\x77\x41\x6b\x97\xd9\xc5\xa6\x97\x4a\xcd\xbc\xcd\xa0\xad\x94\x4c\xe5\x21"
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      "\xe0\x4c\x20\xda\xb9\xa7\xa5\xdb\x82\x7d\x1a\x1f\x80\x36\xc2\xd7\xbc\x35"
      "\x6c\x89\x5f\x67\x04\x82\xea\x51\xf6\xe9\x04\xf9\x46\x33\xb4\xe3\xa4\x99"
      "\x67\xb1\xe9\x76\x10\x1f\xb1\xbc\x7b\xde\xdc\x7e\xae\x51\x16\x17\xae\x3a"
      "\xc8\x79\x28\x6b\x1e\xff\x66\x40\xe9\xfa\xec\x72\x95\x5c\x7a\xd2\x96\xe0"
      "\x82\x5e\x40\x8b\xa2\x69\x0d\xd5\x01\xc1\x89\x81\x39\x95\xcd\x4d\x23\x5f"
      "\xcd\x91\x78\x8e\x58\x80\xe1\x8e\xa8\x26\xb9\x15\x58\x55\xfd\xdb\x30\x4f"
      "\x75\xc2\x8a\x19\x09\xd7\xd7\x43\x79\x79\x76\x5b\x4f\x80\xf8\x60\xa6\xc8"
      "\x87\x95\xc7\xd9\x51\xc0\x30\xf6\x38\x8d\xfd\x6f\xe7\xe1\x4f\x7f\x7a\x9c"
      "\xd0\x5d\x07\x9c\x6b\xdf\xb3\xdd\xa7\x66\x4f\x36\x6e\x28\xd2\x18\xc1\xc7"
      "\x65\x40\x77\xcd\x3b\xa7\xcb\xc5\x31\x07\x23\xb6\x8f\xb2\x47\xe1\x24\x0a"
      "\x23\x81\xe6\xeb\x9a\xcf\xf2\x5d\xfd\x2f\xf6\x1b\x27\xa2\x49\x62\x16\x6c"
      "\x15\xa6\x12\x24\x2b\x4e\x74\xfb\x54\x00\x23\x0e\x7e\x51\x2b\x4f\xf7\x88"
      "\x8a\xe2\x3f\xfc\x88\x72\x51\xc7\x87\xff\x0e\xd0\xca\xb2\x5f\xb5\xd9\xff"
      "\x7e\x42\xb9\x94\x4a\x91\x55\x89\x73\x0e\xb4\xdf\xcc\xec\xcb\xbc\x8a\xe8"
      "\x8a\x44\xb4\x61\xaf\x09\x64\x3f\xdc\x00\x75\xd9\x19\xef\x67\x01\x67\xdb"
      "\xb7\xb0\x10\x4b\xeb\xdf\x92\x4a\x25\x7a\xf6\x83\x9b\x30\x3d\x08\x81\x2f"
      "\x5f\x51\x7e\x3d\x02\x16\x01\x91\x72\x13\x1b\x1a\x88\x4b\xaf\x92\x6d\x67"
      "\x25\x2a\xec\xaf\x61\x3b\x59\xd2\x82\xe7\x5c\xb0\xe5\xde\xf7\x0a\xe2\x2c"
      "\x49\xd9\xce\x89\x49\xc1\xc4\x5a\xcb\x86\x8c\xc4\x8a\xcf\xb5\x7c\xb7\x78"
      "\x5c\x91\x04\x99\x88\x11\x18\x10\x4c\xa6\x6e\xab\xcc\xbb\x84\xb2\x10\xa4"
      "\x95\x77\xec\xb9\x50\x24\x4d\x5a\xef\x05\xc9\x84\xd1\x51\x41\x6d\x8e\x77"
      "\x9a\xcd\xe6\x61\x65\x36\x4c\xc7\xf5\xb1\xf3\x9c\xa5\x4f\x58\x94\xde\x7f"
      "\x1a\xef",
      4088));
  syscall(__NR_ioctl, -1, 0x5000940a, 0x20000380ul);
  NONFAILING(memcpy((void*)0x200002c0, "squashfs\000", 9));
  NONFAILING(memcpy((void*)0x200000c0, "./file0\000", 8));
  NONFAILING(*(uint64_t*)0x20000200 = 0x20010000);
  NONFAILING(memcpy(
      (void*)0x20010000,
      "\x68\x73\x71\x73\x07\x00\x00\x00\x91\x1d\x67\x5f\x00\x10\x00\x00\x07\x00"
      "\x00\x00\x01\x00\x0c\x00\xe0\x00\x02\x00\x04\x00\x00\x00\x1a\x01\x00\x00"
      "\x00\x00\x00\x00\xf5\x01\x00\x00\x00\x00\x00\x00\xa4\x01\x00\x00\x00\x00"
      "\x00\x00\xdd\x01\x00\x00\x00\x00\x00\x00\x81\x00\x00\x00\x00\x00\x00\x00"
      "\x15\x01\x00\x00\x00\x00\x00\x00\x6c\x01\x00\x00\x00\x00\x00\x00\x92\x01"
      "\x00\x00\x00\x00\x00\x00\x78\xda\x2b\xae\xac\xca\x4e\xcc\xc9\x49\x2d\x2a"
      "\xa6\x1d\xa3\x98\x0e\x76\x8c\x32\x46\x19\xa3\x8c\xa1\xc6\x40\x70\x01\x34"
      "\x43\xf4\x14\x92\x00\x78\xda\x63\x62\x78\xcb\xc8\xc0\xc0\xc8\x30\x51\x36"
      "\x3d\x1e\xc8\x40\x01\x29\x40\xcc\x84\x24\xcf\x8c\x26\x27\xc5\xc2\xc0\xc0"
      "\xcc\xf0\x1f\x2e\x0f\xe4\x32\x80\xcc\x50\x03\x62\xfd\x92\xdc\x02\xfd\xe2"
      "\xca\x2a\xdd\xcc\xdc\xc4\xf4\xd4\xf4\xd4\x3c\x13\x43\x4b\x73\x73\x33\x63"
      "\x4b\x23\xfd\xb4\xcc\x9c\x54\x03\x08\xc9\x88\x64\x3a\x13\xd4\x64\x10\xad"
      "\x09\xc4\xec\x40\xcc\x89\x24\xcf\x8a\x64\x3b\x17\x9a\x4b\x61\x2e\xaf\x63"
      "\x81\xd0\xc8\xfa\xd8\x80\xfc\x04\xa8\xbc\x86\x32\xaa\x3e\x90\x5d\xff\x81"
      "\x80\x01\x89\x46\x98\x79\x00\x6e\x06\x3b\x54\x0c\x14\x02\x21\x40\xff\x71"
      "\x00\x69\x00\x62\xdd\x28\x25\x45\x00\x78\xda\x63\x64\x80\x00\x66\x20\x56"
      "\x00\x62\x26\x06\x16\x86\xb4\xcc\x9c\x54\x03\x07\x06\x46\xa0\x20\x84\x63"
      "\xc8\x02\x55\xc5\x08\xa5\x99\x18\x38\xc0\x12\x7a\xc9\xf9\x39\x29\x75\x40"
      "\x61\x46\x98\xb6\x79\x40\x06\xcc\x0c\xc3\x6b\x0c\xac\x70\x8e\x11\x32\xc7"
      "\x18\x04\x38\xd7\x11\xc7\x0e\x00\x78\xda\x4b\x60\x80\x00\x45\x28\x0d\x00"
      "\x07\x18\x00\x82\x5c\x01\x00\x00\x00\x00\x00\x00\x1c\x00\x78\xda\x63\x60"
      "\x80\x80\x3a\x28\xad\x00\xa5\x1d\xa0\xf4\x3c\x28\x7d\x0d\x4a\x4b\x31\x42"
      "\x68\x00\x41\xdf\x02\x6e\x74\x01\x00\x00\x00\x00\x00\x00\x08\x80\x5c\xf9"
      "\x01\x00\x53\x5f\x01\x00\x9a\x01\x00\x00\x00\x00\x00\x00\x1d\x00\x78\xda"
      "\x63\x60\x60\x63\xa8\x48\x2c\x29\x29\x32\x64\x63\x60\x80\xb2\x18\x60\x62"
      "\x46\x70\x31\x23\x00\xb5\xbc\x09\xab\x10\x80\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x02\x00\x00\x00\x24\x00\x00\x00\xac\x01\x00\x00\x00\x00\x00\x00"
      "\x01",
      486));
  NONFAILING(*(uint64_t*)0x20000208 = 0x1e6);
  NONFAILING(*(uint64_t*)0x20000210 = 0);
  NONFAILING(syz_mount_image(0x200002c0, 0x200000c0, 0xa0000000001f5, 1,
                             0x20000200, 0x200040, 0x20010200));
  NONFAILING(memcpy((void*)0x20000140, "./file0\000", 8));
  res = syscall(__NR_open, 0x20000140ul, 0ul, 0ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(
      memcpy((void*)0x200003c0, "\x09\x00\x00\x00\x01\x00\x00\x00\x10", 9));
  syscall(__NR_open_by_handle_at, r[0], 0x200003c0ul, 0ul);
  return 0;
}