// https://syzkaller.appspot.com/bug?id=9e2db8bd054656b161347fe5d2af68dc04283d25
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    unsigned long nb = a1;
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(nb % 10);
      nb /= 10;
    }
    return open(buf, a2 & ~O_CREAT, 0);
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  memfd_create arguments: [
  //    name: ptr[in, buffer] {
  //      buffer: {73 79 7a 6b 61 6c 6c 65 72 00} (length 0xa)
  //    }
  //    flags: memfd_flags = 0x0 (8 bytes)
  //  ]
  //  returns fd_memfd
  memcpy((void*)0x200000000000, "syzkaller\000", 10);
  res = syscall(__NR_memfd_create, /*name=*/0x200000000000ul, /*flags=*/0ul);
  if (res != -1)
    r[0] = res;
  //  ftruncate arguments: [
  //    fd: fd (resource)
  //    len: intptr = 0x10000 (8 bytes)
  //  ]
  syscall(__NR_ftruncate, /*fd=*/r[0], /*len=*/0x10000ul);
  //  pwrite64 arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {80 00 00 00 80 00 00 00 01 00 00 00 00 10 00 00 00 04 00 00
  //      04 00 00 00 05 00 00 00} (length 0x1c)
  //    }
  //    count: len = 0x1c (8 bytes)
  //    pos: intptr = 0x2024 (8 bytes)
  //  ]
  memcpy((void*)0x200000001020,
         "\x80\x00\x00\x00\x80\x00\x00\x00\x01\x00\x00\x00\x00\x10\x00\x00\x00"
         "\x04\x00\x00\x04\x00\x00\x00\x05\x00\x00\x00",
         28);
  syscall(__NR_pwrite64, /*fd=*/r[0], /*buf=*/0x200000001020ul,
          /*count=*/0x1cul, /*pos=*/0x2024ul);
  //  pwrite64 arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {00 08 00 00 00 00 00 00 00 00 00 00 00 04} (length 0xe)
  //    }
  //    count: len = 0xe (8 bytes)
  //    pos: intptr = 0x2068 (8 bytes)
  //  ]
  memcpy((void*)0x200000001060,
         "\x00\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x04", 14);
  syscall(__NR_pwrite64, /*fd=*/r[0], /*buf=*/0x200000001060ul, /*count=*/0xeul,
          /*pos=*/0x2068ul);
  //  pwrite64 arguments: [
  //    fd: fd (resource)
  //    buf: nil
  //    count: len = 0x0 (8 bytes)
  //    pos: intptr = 0x2098 (8 bytes)
  //  ]
  syscall(__NR_pwrite64, /*fd=*/r[0], /*buf=*/0ul, /*count=*/0ul,
          /*pos=*/0x2098ul);
  //  pwrite64 arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {54 19 01 00 54 19 01 00 54 19 01 00 54 19 01 00 54 19 01 00}
  //      (length 0x14)
  //    }
  //    count: len = 0x14 (8 bytes)
  //    pos: intptr = 0x2554 (8 bytes)
  //  ]
  memcpy((void*)0x2000000010e0,
         "\x54\x19\x01\x00\x54\x19\x01\x00\x54\x19\x01\x00\x54\x19\x01\x00\x54"
         "\x19\x01\x00",
         20);
  syscall(__NR_pwrite64, /*fd=*/r[0], /*buf=*/0x2000000010e0ul,
          /*count=*/0x14ul, /*pos=*/0x2554ul);
  //  syz_open_dev$loop arguments: [
  //    dev: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 6c 6f 6f 70 23 00} (length 0xb)
  //    }
  //    id: intptr = 0x0 (8 bytes)
  //    flags: open_flags = 0x2 (8 bytes)
  //  ]
  //  returns fd_loop
  memcpy((void*)0x200000002000, "/dev/loop#\000", 11);
  res = -1;
  res = syz_open_dev(/*dev=*/0x200000002000, /*id=*/0, /*flags=O_RDWR*/ 2);
  if (res != -1)
    r[1] = res;
  //  ioctl$LOOP_SET_FD arguments: [
  //    fd: fd_loop (resource)
  //    cmd: const = 0x4c00 (4 bytes)
  //    arg: fd (resource)
  //  ]
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x4c00, /*arg=*/r[0]);
  //  mkdirat arguments: [
  //    fd: fd_dir (resource)
  //    path: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
  //    }
  //    mode: open_mode = 0x1ff (8 bytes)
  //  ]
  memcpy((void*)0x200000003000, "./mnt\000", 6);
  syscall(
      __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000003000ul,
      /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
      0x1fful);
  //  mount arguments: [
  //    src: ptr[in, blockdev_filename] {
  //      union blockdev_filename {
  //        loop: loop_filename {
  //          prefix: buffer: {2f 64 65 76 2f 6c 6f 6f 70} (length 0x9)
  //          id: proc = 0x0 (1 bytes)
  //          z: const = 0x0 (1 bytes)
  //        }
  //      }
  //    }
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {75 66 73 00} (length 0x4)
  //    }
  //    flags: mount_flags = 0x0 (8 bytes)
  //    data: nil
  //  ]
  memcpy((void*)0x200000000040, "/dev/loop", 9);
  *(uint8_t*)0x200000000049 = 0x30;
  *(uint8_t*)0x20000000004a = 0;
  memcpy((void*)0x200000003000, "./mnt\000", 6);
  memcpy((void*)0x200000004000, "ufs\000", 4);
  syscall(__NR_mount, /*src=*/0x200000000040ul, /*dst=*/0x200000003000ul,
          /*type=*/0x200000004000ul, /*flags=*/0ul, /*data=*/0ul);
  return 0;
}