// https://syzkaller.appspot.com/bug?id=ac7d83330e5b421283436e44cb7e186da15b8f9c
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/loop.h>
#include <stdint.h>
#include <stdio.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>

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 (32 << 20)

#define SYZ_memfd_create 319

static uintptr_t syz_mount_image(uintptr_t fs, uintptr_t dir, uintptr_t size,
                                 uintptr_t nsegs, uintptr_t segments,
                                 uintptr_t flags, uintptr_t opts)
{
  char loopname[64];
  int loopfd, err = 0, res = -1;
  uintptr_t 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);
  if (strcmp((char*)fs, "iso9660") == 0)
    flags |= MS_RDONLY;
  if (mount(loopname, (char*)dir, (char*)fs, flags, (char*)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;
}

static void execute_one();
extern unsigned long long procid;

void loop()
{
  while (1) {
    execute_one();
  }
}

unsigned long long procid;
void execute_one()
{
  memcpy((void*)0x20000140, "gfs2", 5);
  memcpy((void*)0x20000180, "./file0", 8);
  *(uint64_t*)0x20000580 = 0x200001c0;
  *(uint64_t*)0x20000588 = 0;
  *(uint64_t*)0x20000590 = 0x1ff;
  *(uint64_t*)0x20000598 = 0x200002c0;
  *(uint64_t*)0x200005a0 = 0;
  *(uint64_t*)0x200005a8 = 0;
  *(uint64_t*)0x200005b0 = 0x20000300;
  *(uint64_t*)0x200005b8 = 0;
  *(uint64_t*)0x200005c0 = 5;
  *(uint64_t*)0x200005c8 = 0x20000380;
  *(uint64_t*)0x200005d0 = 0;
  *(uint64_t*)0x200005d8 = 0xffff;
  *(uint64_t*)0x200005e0 = 0x20000400;
  *(uint64_t*)0x200005e8 = 0;
  *(uint64_t*)0x200005f0 = 3;
  *(uint64_t*)0x200005f8 = 0x20000440;
  *(uint64_t*)0x20000600 = 0;
  *(uint64_t*)0x20000608 = 8;
  *(uint64_t*)0x20000610 = 0x20000480;
  *(uint64_t*)0x20000618 = 0;
  *(uint64_t*)0x20000620 = 0x8000;
  memcpy((void*)0x20000640, "lockproto=dlm", 13);
  *(uint8_t*)0x2000064d = 0x2c;
  memcpy((void*)0x2000064e, "upgrade", 7);
  *(uint8_t*)0x20000655 = 0x2c;
  memcpy((void*)0x20000656, "localcaching", 12);
  *(uint8_t*)0x20000662 = 0x2c;
  memcpy((void*)0x20000663, "locktable", 9);
  *(uint8_t*)0x2000066c = 0x3d;
  memcpy((void*)0x2000066d, "vfat", 5);
  *(uint8_t*)0x20000672 = 0x2c;
  memcpy((void*)0x20000673, "noloccookie", 11);
  *(uint8_t*)0x2000067e = 0x2c;
  memcpy((void*)0x2000067f, "data=writeback", 14);
  *(uint8_t*)0x2000068d = 0x2c;
  memcpy((void*)0x2000068e, "errors=withdraw", 15);
  *(uint8_t*)0x2000069d = 0x2c;
  memcpy((void*)0x2000069e, "norecovery", 10);
  *(uint8_t*)0x200006a8 = 0x2c;
  memcpy((void*)0x200006a9, "quota=account", 13);
  *(uint8_t*)0x200006b6 = 0x2c;
  memcpy((void*)0x200006b7, "ignore_local_fs", 15);
  *(uint8_t*)0x200006c6 = 0x2c;
  *(uint8_t*)0x200006c7 = 0;
  syz_mount_image(0x20000140, 0x20000180, 0, 7, 0x20000580, 0x841, 0x20000640);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}