[Bug 225389] mount_msdosfs: msdosfs_iconv: Operation not permitted

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225389

            Bug ID: 225389
           Summary: mount_msdosfs: msdosfs_iconv: Operation not permitted
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: aeuii at posteo.de

"mount_msdosfs: msdosfs_iconv: Operation not permitted" occurs when mounting
mounting msdosfs with flags "-L=en_GB.UTF-8".

I confirmed can confirm it on 11.1-RELEASE-p6 and in a VirtualBox using
FreeBSD-11.1-RELEASE-amd64.vhd image.

Environment and steps to reproduce:

% uname -a
FreeBSD myhost 11.1-RELEASE-p4 FreeBSD 11.1-RELEASE-p4 #0: Tue Nov 14 06:12:40
UTC 2017     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC 
amd64


% locale
LANG=en_GB.UTF-8
LC_CTYPE="en_GB.UTF-8"
LC_COLLATE="en_GB.UTF-8"
LC_TIME="en_GB.UTF-8"
LC_NUMERIC="en_GB.UTF-8"
LC_MONETARY="en_GB.UTF-8"
LC_MESSAGES="en_GB.UTF-8"
LC_ALL=en_GB.UTF-8


% cat /boot/loader.conf | grep iconv
msdosfs_iconv_load="YES"
libiconv_load="YES"


% cat /etc/fstab | grep UTF-8
/dev/da1        /home/myuser/mnt/u0      msdosfs
rw,noauto,noexec,-L=en_GB.UTF-8,-m=600,-M=700   0       0
/dev/da1s1      /home/myuser/mnt/u1      msdosfs
rw,noauto,noexec,-L=en_GB.UTF-8,-m=600,-M=700   0       0


% sysctl vfs.usermount
vfs.usermount: 1



% cat /etc/rc.conf | grep kiconv
kiconv_preload="YES"
kiconv_local_charset="UTF-8"
kiconv_foreign_charset="UTF-16BE UTF-8"
kiconv_fstypes="msdosfs"


% pkg info|grep kiconv
kiconvtool-0.98                Tool to preload kernel iconv charset tables



** initially loaded tables

% kiconvtool -d
UTF-8 -> UTF-16BE
UTF-16BE -> UTF-8


** try to mount as a regular user

% mount /home/user/mnt/u1
mount_msdosfs: msdosfs_iconv: Operation not permitted



** mount fs as root

# mount /home/user/mnt/u1
# umount /home/user/mnt/u1


** tables after root mounted the fs

% kiconvtool -d
UTF-8 -> UTF-16BE
UTF-16BE -> UTF-8
UTF-8 -> _wctype


** now a regular user can mount too

% mount /home/user/mnt/u1

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