1.\" 2.\" Copyright (c) 2004 Alfred Perlstein 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 19.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 21.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 22.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.Dd April 2, 2004 27.Dt VFS_SUSER 9 28.Os 29.Sh NAME 30.Nm vfs_suser 31.Nd check if credentials have superuser privileges for a mount point 32.Sh SYNOPSIS 33.In sys/param.h 34.In sys/systm.h 35.In sys/mount.h 36.Ft int 37.Fn vfs_suser "struct mount *mp" "struct thread *td" 38.Sh DESCRIPTION 39The 40.Fn vfs_suser 41function checks if the credentials given include superuser powers 42for the given mount point. 43It will check to see if the thread 44passed in has the same credentials as the user that mounted the 45file system. 46If so, it returns 0, otherwise it returns what 47.Xr priv_check 9 48would have returned. 49.Sh RETURN VALUES 50The 51.Fn vfs_suser 52function returns 0 if the user has superuser powers and 53.Er EPERM 54otherwise. 55This is the 56.Em reverse logic 57of some other implementations of 58.Fn suser 59in which a TRUE response indicates superuser powers. 60.Sh SEE ALSO 61.Xr chroot 2 , 62.Xr jail 2 63.Sh HISTORY 64The 65.Fn vfs_suser 66function was introduced in 67.Fx 5.2 . 68.Sh AUTHORS 69This manual page was written by 70.An Alfred Perlstein . 71