1.\" $NetBSD: do_setresuid.9,v 1.3 2004/10/04 19:09:28 rumble Exp $ 2.\" 3.\"- 4.\" Copyright (c) 2003 The NetBSD Foundation, Inc. 5.\" All rights reserved. 6.\" 7.\" This code is derived from software contributed to The NetBSD Foundation 8.\" by David Laight. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of The NetBSD Foundation nor the names of its 19.\" contributors may be used to endorse or promote products derived 20.\" from this software without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32.\" POSSIBILITY OF SUCH DAMAGE. 33.\" 34.Dd September 28, 2003 35.Dt DO_SETRESUID 9 36.Os 37.Sh NAME 38.Nm do_setresuid , 39.Nm do_setresgid 40.Nd set process uid and gid 41.Sh SYNOPSIS 42.In sys/ucred.h 43.Ft int 44.Fn do_setresuid "struct lwp *lwp" "uid_t ruid" "uid_t euid" "uid_t svuid" "u_int flags" 45.Ft int 46.Fn do_setresgid "struct lwp *lwp" "uid_t ruid" "uid_t euid" "uid_t svuid" "u_int flags" 47.Sh DESCRIPTION 48The 49.Nm do_setresuid 50and 51.Nm do_setresgid 52functions are used to implement the various system calls that allow a 53process to change its real, effective, and saved uid and gid values. 54.Pp 55The 56.Nm do_setresuid 57function sets the specified processes real user ID to 58.Ar ruid , 59its effective user ID to 60.Ar euid , 61and its saved user ID to 62.Ar svuid . 63If any of the uid arguments are \-1 then that assignment is skipped. 64.Pp 65If 66.Fn suser 67is true, then any values may be assigned, otherwise the new uid 68values must match one of the existing values and the caller must have 69set the relevant bit in 70.Ar flags . 71.Pp 72The 73.Ar flags 74argument specifies which of the existing uid values the new value must match. 75It should be set to a logical OR of ID_{R,E,S}_EQ_{R,E,S}, where ID_E_EQ_R 76means that it is valid to set the effective ID to the current value of the 77real ID. 78.Pp 79The 80.Nm do_setresgid 81function sets the group IDs but otherwise behaves in the same manner as 82.Nm . 83The processes group list is neither examined nor effected. 84.Sh SEE ALSO 85.Xr setregid 2 , 86.Xr setreuid 2 , 87.Xr setuid 2 , 88.Xr suser 9 89.Sh CODE REFERENCES 90These functions are implemented in: 91.Pa sys/kern/kern_prot.c . 92.Sh HISTORY 93Implemented for 94.Nx 2.0 95to replace ad-hoc code in each system call routine and in the 96various compat modules. 97