Re: mount_ntfs(8) -u/-g problem?

On Wed, Aug 17, 2022 at 03:52:36PM -0400, Michael W. Lucas wrote:

> Hi,
>
> I'm running:
>
> OpenBSD victim.blackhelicopters.org 7.2 GENERIC.MP#640 amd64
>
> According to mount_ntfs(8), -u and -g let you set UID and GID of
> mounted filesystems. Took an NTFS USB drive, plugged it in, mounted
> it, and checked ownership.
>
> # mount_ntfs -u mwlucas -g mwlucas /dev/sd4i /mnt/
> # ls -lai /mnt/
> total 107
> 4 -rwxr-xr-x 1 root wheel 2560 Dec 31 1600 $AttrDef
> 8 -rwxr-xr-x 1 root wheel 0 Dec 31 1600 $BadClus
> 6 -rwxr-xr-x 1 root wheel 32768 Dec 31 1600 $Bitmap
> 7 -rwxr-xr-x 1 root wheel 0 Dec 31 1600 $Boot
> 11 drwxr-xr-x 1 root wheel 0 Aug 17 15:05 $Extend
> 2 -rwxr-xr-x 1 root wheel 0 Dec 31 1600 $LogFile
> 1 -rwxr-xr-x 1 root wheel 0 Dec 31 1600 $MFTMirr
> 9 -rwxr-xr-x 1 root wheel 0 Aug 17 15:05 $Secure
> 10 -rwxr-xr-x 1 root wheel 131072 Dec 31 1600 $UpCase
> 3 -rwxr-xr-x 1 root wheel 0 Dec 31 1600 $Volume
> 5 drwxr-xr-x 1 root wheel 0 Dec 31 1600 .
> 2 drwxr-xr-x 15 root wheel 512 Aug 16 13:02 ..
> 36 drwxr-xr-x 1 root wheel 0 Aug 17 15:05 System Volume Information
> 38 -rwxr-xr-x 1 root wheel 111496224 Aug 17 13:35 VirtualBox-6.1.36-152435-Win.exe
>
> If I create /tmp/mnt owned by mwlucas:mwlucas and mount there,
> ownership of the mount point is changed to root:wheel and the files
> are owned by root.
>
> # chown mwlucas:mwlucas /tmp/mnt
> ls -lai /tmp/
> total 1
> 2 drwxrwxrwt 9 root wheel 512 Aug 17 15:42 .
> 2 drwxr-xr-x 15 root wheel 512 Aug 16 13:02 ..
> 25920 drwxrwxrwt 2 root wheel 512 Aug 16 13:02 .ICE-unix
> 388800 drwxrwxrwt 2 root wheel 512 Aug 16 13:02 .X11-unix
> 77760 drwxr-xr-x 2 mwlucas mwlucas 512 Aug 17 15:42 mnt
> 259200 drwxr-xr-x 2 root wheel 512 Aug 16 13:02 sndio
> ...
>
> # mount_ntfs -u mwlucas -g mwlucas /dev/sd4i /tmp/mnt/
>
> # ls -lai /tmp/mnt/
> total 107
> 4 -rwxr-xr-x 1 root wheel 2560 Dec 31 1600 $AttrDef
> 8 -rwxr-xr-x 1 root wheel 0 Dec 31 1600 $BadClus
> 6 -rwxr-xr-x 1 root wheel 32768 Dec 31 1600 $Bitmap
> 7 -rwxr-xr-x 1 root wheel 0 Dec 31 1600 $Boot
> 11 drwxr-xr-x 1 root wheel 0 Aug 17 15:05 $Extend
> ...
>
> Am I doing something wrong here, or did I find a bug?

-g and -u only accept numeric ids. So at least a documentation issue.

-Otto
>
> FWIW, mount_msdos -u and -g assigns ownership.
>
> Thanks,
> ==ml
>
>
>
> --
> Michael W. Lucas https://mwl.io/
> author of: Absolute OpenBSD, SSH Mastery, git commit murder,
> Absolute FreeBSD, Immortal Clay, Prohibition Orcs, etc, etc, etc...
> ### New books: TLS Mastery, the Networknomicon, $ git sync murder ###
>