// https://syzkaller.appspot.com/bug?id=90cd06695bd4650a5228385b4b02f370ef9c219f
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

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

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 long syz_mount_image(long fsarg, long dir, unsigned long size,
                            unsigned long nsegs, long segments, long flags,
                            long optsarg)
{
  char loopname[64], fs[32], opts[256];
  int loopfd, err = 0, res = -1;
  unsigned long i;
  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_mount_image", 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;
    }
  }
  mkdir((char*)dir, 0777);
  memset(fs, 0, sizeof(fs));
  strncpy(fs, (char*)fsarg, sizeof(fs) - 1);
  memset(opts, 0, sizeof(opts));
  strncpy(opts, (char*)optsarg, 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");
  }
  if (mount(loopname, (char*)dir, fs, flags, opts)) {
    err = errno;
    goto error_clear_loop;
  }
  res = 0;
error_clear_loop:
  ioctl(loopfd, LOOP_CLR_FD, 0);
error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return res;
}

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

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  long res = 0;
  memcpy((void*)0x20000000, "/dev/kvm", 9);
  res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000000, 0, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_ioctl, r[0], 0xae01, 0);
  if (res != -1)
    r[1] = res;
  res = syscall(__NR_ioctl, r[1], 0xae41, 0);
  if (res != -1)
    r[2] = res;
  *(uint32_t*)0x20000300 = 0;
  *(uint32_t*)0x20000304 = 0;
  *(uint64_t*)0x20000308 = 0;
  *(uint64_t*)0x20000310 = 0;
  *(uint64_t*)0x20000318 = 0;
  *(uint64_t*)0x20000320 = 0;
  *(uint8_t*)0x20000328 = 0;
  *(uint8_t*)0x20000329 = 0;
  *(uint8_t*)0x2000032a = 0;
  *(uint8_t*)0x2000032b = 0;
  *(uint8_t*)0x2000032c = 0;
  *(uint8_t*)0x2000032d = 0;
  *(uint8_t*)0x2000032e = 0;
  *(uint8_t*)0x2000032f = 0;
  *(uint8_t*)0x20000330 = 0;
  *(uint8_t*)0x20000331 = 0;
  *(uint8_t*)0x20000332 = 0;
  *(uint8_t*)0x20000333 = 0;
  *(uint8_t*)0x20000334 = 0;
  *(uint8_t*)0x20000335 = 0;
  *(uint8_t*)0x20000336 = 0;
  *(uint8_t*)0x20000337 = 0;
  *(uint8_t*)0x20000338 = 0;
  *(uint8_t*)0x20000339 = 0;
  *(uint8_t*)0x2000033a = 0;
  *(uint8_t*)0x2000033b = 0;
  *(uint8_t*)0x2000033c = 0;
  *(uint8_t*)0x2000033d = 0;
  *(uint8_t*)0x2000033e = 0;
  *(uint8_t*)0x2000033f = 0;
  *(uint8_t*)0x20000340 = 0;
  *(uint8_t*)0x20000341 = 0;
  *(uint8_t*)0x20000342 = 0;
  *(uint8_t*)0x20000343 = 0;
  *(uint8_t*)0x20000344 = 0;
  *(uint8_t*)0x20000345 = 0;
  *(uint8_t*)0x20000346 = 0;
  *(uint8_t*)0x20000347 = 0;
  *(uint8_t*)0x20000348 = 0;
  *(uint8_t*)0x20000349 = 0;
  *(uint8_t*)0x2000034a = 0;
  *(uint8_t*)0x2000034b = 0;
  *(uint8_t*)0x2000034c = 0;
  *(uint8_t*)0x2000034d = 0;
  *(uint8_t*)0x2000034e = 0;
  *(uint8_t*)0x2000034f = 0;
  *(uint8_t*)0x20000350 = 0;
  *(uint8_t*)0x20000351 = 0;
  *(uint8_t*)0x20000352 = 0;
  *(uint8_t*)0x20000353 = 0;
  *(uint8_t*)0x20000354 = 0;
  *(uint8_t*)0x20000355 = 0;
  *(uint8_t*)0x20000356 = 0;
  *(uint8_t*)0x20000357 = 0;
  *(uint8_t*)0x20000358 = 0;
  *(uint8_t*)0x20000359 = 0;
  *(uint8_t*)0x2000035a = 0;
  *(uint8_t*)0x2000035b = 0;
  *(uint8_t*)0x2000035c = 0;
  *(uint8_t*)0x2000035d = 0;
  *(uint8_t*)0x2000035e = 0;
  *(uint8_t*)0x2000035f = 0;
  *(uint8_t*)0x20000360 = 0;
  *(uint8_t*)0x20000361 = 0;
  *(uint8_t*)0x20000362 = 0;
  *(uint8_t*)0x20000363 = 0;
  *(uint8_t*)0x20000364 = 0;
  *(uint8_t*)0x20000365 = 0;
  *(uint8_t*)0x20000366 = 0;
  *(uint8_t*)0x20000367 = 0;
  syscall(__NR_ioctl, r[2], 0x4080aebf, 0x20000300);
  memcpy((void*)0x200000c0, "ext3", 5);
  memcpy((void*)0x200001c0, "./file0", 8);
  *(uint64_t*)0x20000040 = 0x20000300;
  *(uint64_t*)0x20000048 = 0;
  *(uint64_t*)0x20000050 = 0x400;
  *(uint8_t*)0x20000000 = 0;
  syz_mount_image(0x200000c0, 0x200001c0, 0, 1, 0x20000040, 0, 0x20000000);
  return 0;
}