// 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*)0x20000040, "gfs2", 5);
  memcpy((void*)0x20000080, "./file0", 8);
  *(uint64_t*)0x20000200 = 0x200000c0;
  *(uint64_t*)0x20000208 = 0;
  *(uint64_t*)0x20000210 = 1;
  *(uint64_t*)0x20000218 = 0x20000100;
  *(uint64_t*)0x20000220 = 0;
  *(uint64_t*)0x20000228 = 0xfffffffffffffffe;
  *(uint64_t*)0x20000230 = 0x20000140;
  *(uint64_t*)0x20000238 = 0;
  *(uint64_t*)0x20000240 = 0xfbb3;
  *(uint64_t*)0x20000248 = 0x20000180;
  *(uint64_t*)0x20000250 = 0;
  *(uint64_t*)0x20000258 = 0x62;
  memcpy((void*)0x200003c0,
         "\x6e\x6f\x72\x67\x72\x70\x6c\x76\x62\x2c\x6e\x6f\x64\x69\x73\x63\x61"
         "\x72\x64\x2c\x65\x72\x72\x6f\x72\x73\x3d\x77\x69\x74\x68\x64\x72\x61"
         "\x77\x2c\x6e\x6f\x62\x61\x72\x72\x69\x65\x72\x2c\x6c\x6f\x63\x6b\x70"
         "\x72\x6f\x74\x6f\x3d\x6c\x6f\x63\x6b\x5f\x6e\x6f\x6c\x6f\x63\x6b\x2c"
         "\x64\x69\x73\x63\x61\x72\x64\x2c\x75\x70\x67\x72\x61\x64\x65\x2c\x73"
         "\x74\x61\x74\x66\x73\x5f\x71\x75\x61\x6e\x74\x75\x6d\x3d\x36\x37\x38"
         "\x35\x2c\x6e\x6f\x71\x75\x6f\x74\x61\x2c\x6c\x6f\x63\x6b\x74\x61\x62"
         "\x6c\x65\x3d\x2f\x64\x65\x76\x2f\x64\x73\x70\x23\x00\x2c\x00\x7b\xd2"
         "\x1b\x06\xfb\x74\x85\xd2\x76\x6c\x50\xce\xfe\x66\x9e\x84\x9c\x16\xc3"
         "\xb3\xee\x0c\xca\x8b\xcb\x2a\xd5\x55\x03\x0c\x12\x92\x96\xb7\xeb",
         169);
  syz_mount_image(0x20000040, 0x20000080, 0, 4, 0x20000200, 2, 0x200003c0);
}

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;
}