Subject: Non-root users mounting a file system?
To: None <current-users@netbsd.org>
From: Paul Goyette <paul@whooppee.com>
List: current-users
Date: 02/20/2007 13:55:45
Folks,
I've made all the necessary permission changes on the mount point as
well as the /dev/{,r}cgd* devices and the /etc/cgd directory (and its
files), but I still cannot seem to have a non-root user, even a member
of group wheel, mount the filesystem. The cgdconfig succeeds, and I
am positive the vfs.generic.usermount is set, yet still I get this:
quicky:paul {105} sysctl vfs.generic.usermount
vfs.generic.usermount = 1
quicky:paul {106} mount /dev/cgd0a /pics
mount_ffs: /dev/cgd0a on /pics: Operation not permitted
quicky:paul {107}
I suspect that this is a result of some flag checks being done in
secmodel_bsd44_suser.c but I don't know enough to understand what these
checks are doing or how to make them succeed.
case KAUTH_REQ_SYSTEM_MOUNT_NEW:
if (isroot)
result = KAUTH_RESULT_ALLOW;
else if (dovfsusermount) {
struct vnode *vp = arg1;
u_long flags = (u_long)arg2;
if (!(flags & MNT_NODEV) ||
!(flags & MNT_NOSUID))
break;
if ((vp->v_mount->mnt_flag & MNT_NOEXEC) &&
!(flags & MNT_NOEXEC))
break;
result = KAUTH_RESULT_ALLOW;
}
break;
----------------------------------------------------------------------
| Paul Goyette | PGP DSS Key fingerprint: | E-mail addresses: |
| Network Engineer | FA29 0E3B 35AF E8AE 6651 | paul@whooppee.com |
| | 0786 F758 55DE 53BA 7731 | pgoyette@juniper.net |
----------------------------------------------------------------------