>Number:         35463
>Category:       kern
>Synopsis:       union fs: usermount issue
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Mon Jan 22 12:05:00 +0000 2007
>Originator:     Denis Lagno
>Release:        4.99.8
>Organization:
>Environment:
NetBSD flam.gado 4.99.8 NetBSD 4.99.8 (FLAM) #0: Sat Jan 20 00:34:40 MSK 2007  dina@flam.gado:/volatile/worksrc/netbsd-current/obj/sys/arch/i386/compile/FLAM i386
>Description:
I have following line in /etc/fstab:

/var/src/repo/netbsd-current/src /var/worksrc/netbsd-current/src union rw,noauto,-b

# stat /var/src/repo/netbsd-current/src
5404 3243524 drwxrwxr-x 24 dina wheel 13209636 512 "Jan 22 14:53:46 2007" "Jan 22 02:02:06 2007" "Jan 22 02:02:54 2007" "Jan  1 03:00:00 1970" 16384 4 0 /var/src/repo/netbsd-current/src

# stat /var/worksrc/netbsd-current/src 
5404 2965504 drwxrwxr-x 2 dina wheel 12077760 512 "Jan 22 14:24:30 2007" "Jan 22 14:24:32 2007" "Jan 22 14:24:56 2007" "Jan  1 03:00:00 1970" 16384 4 0 /var/worksrc/netbsd-current/src

# sysctl vfs.generic.usermount            
vfs.generic.usermount = 1

However when user (owner of corresponding directories) tries to mount it, he gets:

$ id
uid=1025(dina) gid=333(folk) groups=0(wheel),5(operator),9(wsrc),20(staff),100(users),333(folk),335(audio),336(floppy)
$ mount /var/src/repo/netbsd-current/src
mount_union: "/var/src/repo/netbsd-current/src" is a relative path.
mount_union: using "/volatile/src/repo/netbsd-current/src" instead.
mount_union: /volatile/src/repo/netbsd-current/src on /volatile/worksrc/netbsd-current/src: Operation not permitted

(This worked in netbsd <= 4.99.3)

Superuser can mount:

# mount /var/src/repo/netbsd-current/src
mount_union: "/var/src/repo/netbsd-current/src" is a relative path.
mount_union: using "/volatile/src/repo/netbsd-current/src" instead.

>How-To-Repeat:

>Fix: