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freebsd/share/man/man9/vfs_suser.9
Attilio Rao cecd8edba5 Remove the suser(9) interface from the kernel. It has been replaced from
years by the priv_check(9) interface and just very few places are left.
Note that compatibility stub with older FreeBSD version
(all above the 8 limit though) are left in order to reduce diffs against
old versions. It is responsibility of the maintainers for any module, if
they think it is the case, to axe out such cases.

This patch breaks KPI so __FreeBSD_version will be bumped into a later
commit.

This patch needs to be credited 50-50 with rwatson@ as he found time to
explain me how the priv_check() works in detail and to review patches.

Tested by:      Giovanni Trematerra <giovanni dot trematerra at gmail dot com>
Reviewed by:    rwatson
2008-09-17 15:49:44 +00:00

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.\"
.\" Copyright (c) 2004 Alfred Perlstein
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.\"
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.\" $FreeBSD$
.\"
.Dd April 2, 2004
.Dt VFS_SUSER 9
.Os
.Sh NAME
.Nm vfs_suser
.Nd check if credentials have superuser privileges for a mount point
.Sh SYNOPSIS
.In sys/param.h
.In sys/systm.h
.In sys/mount.h
.Ft int
.Fn vfs_suser "struct mount *mp" "struct thread *td"
.Sh DESCRIPTION
The
.Fn vfs_suser
function checks if the credentials given include superuser powers
for the given mount point.
It will check to see if the thread
passed in has the same credentials as the user that mounted the
file system.
If so, it returns 0, otherwise it returns what
.Xr priv_check 9
would have returned.
.Sh RETURN VALUES
The
.Fn vfs_suser
function returns 0 if the user has superuser powers and
.Er EPERM
otherwise.
This is the
.Em reverse logic
of some other implementations of
.Fn suser
in which a TRUE response indicates superuser powers.
.Sh SEE ALSO
.Xr chroot 2 ,
.Xr jail 2
.Sh HISTORY
The
.Fn vfs_suser
function was introduced in
.Fx 5.2 .
.Sh AUTHORS
This manual page was written by
.An Alfred Perlstein .