vboxsf: files with illegal (:) characters truncated on host's NTFS shared folder / results in data loss

[baitisj]

Moving a file from a Linux guest filesystem that is tolerant of e.g. the colon character (:) in a filename, to a Windows-hosted NTFS filesystem using vboxsf results in truncation (DATA LOSS) and odd naming behavior.

Steps to reproduce:

1. Create a file on a Linux filesystem in a guest; e.g.

   # dd if=/dev/random of='/tmp/1mega:byte' bs=1M count=1
   

2. Mount NTFS shared folder:

   # mount -t vboxsf SHARE /mnt
   

3. Move file to vboxsf shared filesystem

   # mv '/tmp/1mega:byte' /mnt
   

RESULT:

a file in /mnt of zero size and truncated filename

# du /mnt/1mega
0       /mnt/1mega

# du '/tmp/1mega:byte'
du: cannot access '/tmp/1mega:byte': no such file or directory

EXPECTED RESULT:

An error that does not result in the truncation of the /tmp/1mega:byte file in the above example OR a renaming of the file in /mnt, along with preservation of the contents of the file.