// https://syzkaller.appspot.com/bug?id=c58de4d8bcb9f8398b6e7317fe3ea58da3b78d3c
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.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;

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;
}

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);

  memcpy((void*)0x20000040, "reiserfs\000", 9);
  memcpy((void*)0x20000100, "./file0\000", 8);
  *(uint64_t*)0x20000140 = 0x200002c0;
  memcpy((void*)0x200002c0,
         "\x00\x40\x00\x00\xec\x1f\x00\x00\x13\x20\x00\x00\x12\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x20\x00\x00\xca\x3e\x00\x00\x73\x56\x4d\x38\x84\x03"
         "\x00\x00\x1e\x00\x00\x00\x00\x00\x00\x00\x00\x10\xec\x03\x02\x00\x01"
         "\x00\x52\x65\x49\x73\x45\x72\x46\x73\x00\xc3\x95\xa5\xe4\x00\x00\x00"
         "\x02\x00\x01\x00\x00\x00\x00\x00\x01\x00\x00\x00\x03\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x02\x73\x00\x01\x00\x16\x00\x3b\xc1"
         "\x65\x5f\x00\x4e\xed\x62\x28\x0c\xde\xe5\xf7\xe2\xeb\x46\xa1\xc2\xe0"
         "\xe3\x4b\x90\x6b\x7b\xfd\x58\x1b\x92\x4f\x23\xe7\xcf\xaa\xcd\xb5\x46"
         "\xf4\xe9\x53\x99\x4b\xc9\xe9\x4f\x68\x08\x9b\x31\x7f\xc4\x97\x9e\xf8"
         "\x65\xaf\x0f\x38\xdd\x50\xba\x5b\x8c\x1f\x5a\xcd\xac\xb8\xd9\xbf\x77"
         "\xba\x85\x83\xe1\x3d\x58\xc3\x83\x8f\x12\x6c\x36\x8e\x65\xfc\x86\xf7"
         "\xf2\x11\xe6\x75\x61\x81\x50\xfd\x00\x00\x3d\xa2\x31\x00\x97\xa9\x9a"
         "\xe0\xb4\x3a\x3b\x19\xbf\x75\x8b\x4c\x73\x45\x84\x38\x12\xe3\x4c\x2b"
         "\xbd\xf3\x61\x24\xdc\xbd\xc4\xbf\x85\x68\x11\xbf\x01\xdc\x4c\x22\x41"
         "\x3e\x0c\xb7\x35\xd5\x17\xd0\x13\xb8\x3a\x9f\x37\xc0\x87\x39\x0e\x96"
         "\xee\xe2\xb3\x89\x6a",
         277);
  *(uint64_t*)0x20000148 = 0x115;
  *(uint64_t*)0x20000150 = 0x10000;
  *(uint64_t*)0x20000158 = 0;
  *(uint64_t*)0x20000160 = 0;
  *(uint64_t*)0x20000168 = 0x11000;
  *(uint64_t*)0x20000170 = 0;
  *(uint64_t*)0x20000178 = 0;
  *(uint64_t*)0x20000180 = 0x11800;
  *(uint64_t*)0x20000188 = 0;
  *(uint64_t*)0x20000190 = 0;
  *(uint64_t*)0x20000198 = 0x2012000;
  *(uint64_t*)0x200001a0 = 0x20010f00;
  memcpy((void*)0x20010f00,
         "\x01\x00\x02\x00\x75\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x20\x00\xe0\x0f\x00\xc9\x01\x00\x00"
         "\x00\x02\x00\x00\x00\x01\x00\x00\x00\xf4\x01\x00\x00\x02\x00\x23\x00"
         "\xbd\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         96);
  *(uint64_t*)0x200001a8 = 0x60;
  *(uint64_t*)0x200001b0 = 0x2013000;
  *(uint64_t*)0x200001b8 = 0;
  *(uint64_t*)0x200001c0 = 0;
  *(uint64_t*)0x200001c8 = 0x2013fa0;
  *(uint8_t*)0x20011100 = 0;
  syz_mount_image(0x20000040, 0x20000100, 0x4000000, 6, 0x20000140, 0,
                  0x20011100);
  return 0;
}