2004-07-09 22:33:43 +00:00
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.\"
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.\" Copyright (c) 2004 Alfred Perlstein
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 2, 2004
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.Dt VFS_SUSER 9
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.Os
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.Sh NAME
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.Nm vfs_suser
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.Nd check if credentials have superuser privileges for a mount point
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/systm.h
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.In sys/mount.h
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.Ft int
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2005-01-14 10:53:55 +00:00
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.Fn vfs_suser "struct mount *mp" "struct thread *td"
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.Sh DESCRIPTION
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The
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.Fn vfs_suser
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2005-01-14 10:53:55 +00:00
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function checks if the credentials given include superuser powers
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2005-06-15 13:31:23 +00:00
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for the given mount point.
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2005-01-14 10:53:55 +00:00
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It will check to see if the thread
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2004-07-09 22:33:43 +00:00
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passed in has the same credentials as the user that mounted the
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2005-01-14 10:53:55 +00:00
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file system.
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If so, it returns 0, otherwise it returns what
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2004-07-09 22:33:43 +00:00
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.Xr suser 9
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would have returned.
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.Sh RETURN VALUES
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The
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.Fn vfs_suser
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2005-01-14 10:53:55 +00:00
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function returns 0 if the user has superuser powers and
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2004-07-09 22:33:43 +00:00
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.Er EPERM
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otherwise.
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This is the
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.Em reverse logic
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of some other implementations of
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.Fn suser
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in which a TRUE response indicates superuser powers.
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.Sh SEE ALSO
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.Xr chroot 2 ,
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.Xr jail 2 ,
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.Xr suser 9
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.Sh HISTORY
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The
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.Fn vfs_suser
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function was introduced in
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.Fx 5.2 .
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.Sh AUTHORS
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This manual page was written by
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.An Alfred Perlstein .
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