2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
135 lines
3.9 KiB
Groff
135 lines
3.9 KiB
Groff
.\" $NetBSD: setuid.2,v 1.22 2010/04/05 07:44:28 wiz Exp $
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. 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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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, 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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.\" @(#)setuid.2 8.1 (Berkeley) 6/4/93
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.\"
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.Dd April 3, 2010
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.Dt SETUID 2
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.Os
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.Sh NAME
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.Nm setuid ,
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.Nm seteuid ,
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.Nm setgid ,
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.Nm setegid
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.Nd set user and group ID
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn setuid "uid_t uid"
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.Ft int
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.Fn seteuid "uid_t euid"
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.Ft int
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.Fn setgid "gid_t gid"
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.Ft int
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.Fn setegid "gid_t egid"
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.Sh DESCRIPTION
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The
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.Fn setuid
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function
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sets the real and effective
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user IDs and the saved set-user-ID of the current process
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to the specified value.
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The
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.Fn setuid
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function is permitted if the specified ID is equal to the real user ID
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of the process, or if the effective user ID is that of the super user.
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.Pp
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The
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.Fn setgid
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function
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sets the real and effective
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group IDs and the saved set-group-ID of the current process
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to the specified value.
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The
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.Fn setgid
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function is permitted if the specified ID is equal to the real group ID
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of the process, or if the effective user ID is that of the super user.
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Supplementary group IDs remain unchanged.
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.Pp
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The
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.Fn seteuid
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function
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.Pq Fn setegid
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sets the effective user ID (group ID) of the
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current process.
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The effective user ID may be set to the value
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of the real user ID or the saved set-user-ID (see
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.Xr intro 2
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and
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.Xr execve 2 ) ;
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in this way, the effective user ID of a set-user-ID executable
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may be toggled by switching to the real user ID, then re-enabled
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by reverting to the set-user-ID value.
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Similarly, the effective group ID may be set to the value
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of the real group ID or the saved set-group-ID.
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.Sh RETURN VALUES
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Upon success, these functions return 0;
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otherwise \-1 is returned.
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.Pp
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If the user is not the super user, or the uid
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specified is not the real, effective ID, or saved ID,
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these functions return \-1.
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.Sh SEE ALSO
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.Xr getgid 2 ,
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.Xr getgroups 2 ,
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.Xr getuid 2
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.Sh STANDARDS
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The
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.Fn setuid
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and
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.Fn setgid
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functions are compliant with the
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.St -p1003.1-90
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specification with
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.Li _POSIX_SAVED_IDS
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not defined.
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We do not implement the
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.Li _POSIX_SAVED_IDS
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option as specified in the standard
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because this would make it impossible for a set-user-ID executable owned
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by a user other than the super-user to permanently revoke its privileges.
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.Pp
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The
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.Fn seteuid
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and
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.Fn setegid
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functions are compliant with
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.St -p1003.1-2001 .
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.Sh HISTORY
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The
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.Fn setuid
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and
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.Fn setgid
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functions appeared in
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.At v2
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and
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.At v4 ,
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respectively.
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