1.\" $NetBSD: do_setresuid.9,v 1.4 2008/04/30 13:10:58 martin 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.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29.\" POSSIBILITY OF SUCH DAMAGE. 30.\" 31.Dd September 28, 2003 32.Dt DO_SETRESUID 9 33.Os 34.Sh NAME 35.Nm do_setresuid , 36.Nm do_setresgid 37.Nd set process uid and gid 38.Sh SYNOPSIS 39.In sys/ucred.h 40.Ft int 41.Fn do_setresuid "struct lwp *lwp" "uid_t ruid" "uid_t euid" "uid_t svuid" "u_int flags" 42.Ft int 43.Fn do_setresgid "struct lwp *lwp" "uid_t ruid" "uid_t euid" "uid_t svuid" "u_int flags" 44.Sh DESCRIPTION 45The 46.Nm do_setresuid 47and 48.Nm do_setresgid 49functions are used to implement the various system calls that allow a 50process to change its real, effective, and saved uid and gid values. 51.Pp 52The 53.Nm do_setresuid 54function sets the specified processes real user ID to 55.Ar ruid , 56its effective user ID to 57.Ar euid , 58and its saved user ID to 59.Ar svuid . 60If any of the uid arguments are \-1 then that assignment is skipped. 61.Pp 62If 63.Fn suser 64is true, then any values may be assigned, otherwise the new uid 65values must match one of the existing values and the caller must have 66set the relevant bit in 67.Ar flags . 68.Pp 69The 70.Ar flags 71argument specifies which of the existing uid values the new value must match. 72It should be set to a logical OR of ID_{R,E,S}_EQ_{R,E,S}, where ID_E_EQ_R 73means that it is valid to set the effective ID to the current value of the 74real ID. 75.Pp 76The 77.Nm do_setresgid 78function sets the group IDs but otherwise behaves in the same manner as 79.Nm . 80The processes group list is neither examined nor effected. 81.Sh SEE ALSO 82.Xr setregid 2 , 83.Xr setreuid 2 , 84.Xr setuid 2 , 85.Xr suser 9 86.Sh CODE REFERENCES 87These functions are implemented in: 88.Pa sys/kern/kern_prot.c . 89.Sh HISTORY 90Implemented for 91.Nx 2.0 92to replace ad-hoc code in each system call routine and in the 93various compat modules. 94