1 .\" Copyright (c) 1983, 1991 The Regents of the University of California.
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
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14 .\" This product includes software developed by the University of
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32 .\" @(#)setregid.2 6.4 (Berkeley) 3/10/91
34 .\" Modified Sat Jul 24 09:08:49 1993 by Rik Faith <faith@cs.unc.edu>
35 .\" Portions extracted from linux/kernel/sys.c:
36 .\" Copyright (C) 1991, 1992 Linus Torvalds
37 .\" May be distributed under the GNU General Public License
38 .\" Changes: 1994-07-29 by Wilf <G.Wilford@ee.surrey.ac.uk>
39 .\" 1994-08-02 by Wilf due to change in kernel.
41 .\" 2004-05-27 by Michael Kerrisk
43 .\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
44 .\" all rights reserved.
45 .\" Translated Fri Dec 12 00:18:45 JST 1997
46 .\" by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
47 .\" Updated & Modified Mon Jun 4 19:11:44 JST 2001
48 .\" by Yuichi SATO <ysato@h4.dion.ne.jp>
49 .\" Updated & Modified Wed Jan 5 00:37:49 JST 2005
50 .\" by Yuichi SATO <ysato444@yahoo.co.jp>
51 .\" Updated 2010-04-23, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.24
53 .\"WORD: effective user ID ¼Â¸ú¥æ¡¼¥¶¡¼ID
54 .\"WORD: real user ID ¼Â¥æ¡¼¥¶¡¼ID
55 .\"WORD: saved user ID Êݸ¥æ¡¼¥¶¡¼ID
56 .\"WORD: super-user ¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼
58 .TH SETREUID 2 2009-10-17 "Linux" "Linux Programmer's Manual"
61 .\"O setreuid, setregid \- set real and/or effective user or group ID
62 setreuid, setregid \- ¼Â (real) ¤È¼Â¸ú (effective) ¥æ¡¼¥¶¡¼ (¥°¥ë¡¼¥×) ID ¤òÀßÄꤹ¤ë
65 .B #include <sys/types.h>
67 .B #include <unistd.h>
69 .BI "int setreuid(uid_t " ruid ", uid_t " euid );
71 .BI "int setregid(gid_t " rgid ", gid_t " egid );
74 .\"O Feature Test Macro Requirements for glibc (see
75 .\"O .BR feature_test_macros (7)):
76 glibc ¸þ¤±¤Îµ¡Ç½¸¡ºº¥Þ¥¯¥í¤ÎÍ×·ï
77 .RB ( feature_test_macros (7)
83 _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
87 .\"O sets real and effective user IDs of the calling process.
89 ¤Ï¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤Î¼Â (real) ¥æ¡¼¥¶¡¼ ID ¤È
90 ¼Â¸ú (effective) ¥æ¡¼¥¶¡¼ ID ¤òÀßÄꤹ¤ë¡£
92 .\"O Supplying a value of \-1 for either the real or effective user ID forces
93 .\"O the system to leave that ID unchanged.
94 ¼Â¥æ¡¼¥¶¡¼ ID ¤ä¼Â¸ú¥æ¡¼¥¶¡¼ ID ¤Ë \-1 ¤òÍ¿¤¨¤¿¾ì¹ç¡¢
95 ¥·¥¹¥Æ¥à¤Ï¤½¤Î ID ¤òÊѹ¹¤·¤Ê¤¤¡£
97 .\"O Unprivileged processes may only set the effective user ID to the real user ID,
98 .\"O the effective user ID, or the saved set-user-ID.
99 ÈóÆø¢¥×¥í¥»¥¹¤Ï¼Â¸ú¥æ¡¼¥¶¡¼ ID ¤ò¼Â¥æ¡¼¥¶¡¼ ID ¤Þ¤¿¤Ï¼Â¸ú¥æ¡¼¥¶¡¼ ID ¤Þ¤¿¤Ï
100 Êݸ set-user-ID ¤Ë¤·¤«ÀßÄê¤Ç¤¤Ê¤¤¡£
102 .\"O Unprivileged users may only set the real user ID to
103 .\"O the real user ID or the effective user ID.
104 ÈóÆø¢¥æ¡¼¥¶¡¼¤Ï¡¢¼Â¥æ¡¼¥¶¡¼ ID ¤ò¼Â¥æ¡¼¥¶¡¼ ID ¤Þ¤¿¤Ï
105 ¼Â¸ú¥æ¡¼¥¶¡¼ ID ¤Ë¤·¤«ÀßÄê¤Ç¤¤Ê¤¤¡£
107 .\"O If the real user ID is set or the effective user ID is set to a value
108 .\"O not equal to the previous real user ID,
109 .\"O the saved set-user-ID will be set to the new effective user ID.
110 ¼Â¥æ¡¼¥¶¡¼ID ¤¬ÀßÄꤵ¤ì¤¿¤ê¡¢¼Â¸ú¥æ¡¼¥¶¡¼ID ¤¬Á°¤Î¼Â¥æ¡¼¥¶¡¼ID ¤È
111 °Û¤Ã¤¿ÃͤËÀßÄꤵ¤ì¤¿¾ì¹ç¡¢Êݸ set-user-ID ¤Ë¤Ï¿·¤·¤¤¼Â¸ú¥æ¡¼¥¶¡¼ID
114 .\"O Completely analogously,
116 .\"O sets real and effective group ID's of the calling process,
117 .\"O and all of the above holds with "group" instead of "user".
120 ¤Ï¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤Î¼Â¥°¥ë¡¼¥× ID ¤È¼Â¸ú¥°¥ë¡¼¥× ID ¤òÀßÄꤷ¡¢
121 ¾åµ¤ÎÀâÌÀ¤Ç¡Ö¥æ¡¼¥¶¡¼¡×¤ò¡Ö¥°¥ë¡¼¥×¡×¤ËÆɤßÂؤ¨¤¿¤³¤È¤¬À®¤êΩ¤Ä¡£
122 .\"O .SH "RETURN VALUE"
124 .\"O On success, zero is returned.
125 .\"O On error, \-1 is returned, and
127 .\"O is set appropriately.
128 À®¸ù¤·¤¿¾ì¹ç¤Ï 0 ¤¬ÊÖ¤µ¤ì¤ë¡£¥¨¥é¡¼¤Î¾ì¹ç¤Ï \-1 ¤¬ÊÖ¤µ¤ì¡¢
135 .\"O The calling process is not privileged
136 .\"O (Linux: does not have the
138 .\"O capability in the case of
139 .\"O .BR setreuid (),
142 .\"O capability in the case of
143 .\"O .BR setregid ())
144 .\"O and a change other than (i)
145 .\"O swapping the effective user (group) ID with the real user (group) ID,
146 .\"O or (ii) setting one to the value of the other or (iii) setting the
147 .\"O effective user (group) ID to the value of the
148 .\"O saved set-user-ID (saved set-group-ID) was specified.
149 ¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤ËÆø¢¤¬¤Ê¤¯
154 ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£ (capability) ¤¬¤Ê¤¯¡¢
158 ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤¬¤Ê¤¤)¡¢
159 °Ê²¼¤Î¤¤¤º¤ì¤Ç¤â¤Ê¤¤Êѹ¹¤¬»ØÄꤵ¤ì¤¿:
160 (i) ¼Â¸ú¥æ¡¼¥¶¡¼ (¥°¥ë¡¼¥×) ID ¤È¼Â¥æ¡¼¥¶¡¼ (¥°¥ë¡¼¥×) ID ¤òÆþ¤ì´¹¤¨¤ë¡£
161 (ii) ÊÒÊý¤ÎÃͤò¾Êý¤ËÀßÄꤹ¤ë¡£
162 (iii) ¼Â¸ú¥æ¡¼¥¶¡¼ (¥°¥ë¡¼¥×) ID ¤ËÊݸ set-user-ID (Êݸ set-group-ID)
164 .\"O .SH "CONFORMING TO"
166 .\"O POSIX.1-2001, 4.3BSD (the
170 .\"O function calls first appeared in 4.2BSD).
175 ´Ø¿ô¥³¡¼¥ë¤Ï 4.2BSD ¤ÇÅо줷¤¿)¡£
178 .\"O Setting the effective user (group) ID to the
179 .\"O saved set-user-ID (saved set-group-ID) is
180 .\"O possible since Linux 1.1.37 (1.1.38).
181 ¼Â¸ú¥æ¡¼¥¶¡¼ (¥°¥ë¡¼¥×) ID ¤òÊݸ¥æ¡¼¥¶¡¼ (¥°¥ë¡¼¥×) ID ¤Ë
182 ÀßÄꤹ¤ë¤³¤È¤¬¡¢Linux 1.1.37 (1.1.38) ¤«¤é²Äǽ¤Ë¤Ê¤Ã¤¿¡£
184 .\"O POSIX.1 does not specify all of possible ID changes that are permitted
185 .\"O on Linux for an unprivileged process.
186 POSIX.1 ¤Ç¤Ï¡¢ÈóÆø¢¥×¥í¥»¥¹¤ËÂФ·¤Æ Linux ¾å¤Çǧ¤á¤é¤ì¤Æ¤¤¤ë ID ¤ÎÊѹ¹¤Î
187 Á´¥Ñ¥¿¡¼¥ó¤òµ¬Äꤷ¤Æ¤¤¤ë¤ï¤±¤Ç¤Ï¤Ê¤¤¡£
189 .\"O .BR setreuid (),
190 .\"O the effective user ID can be made the same as the
191 .\"O real user ID or the save set-user-ID,
192 .\"O and it is unspecified whether unprivileged processes may set the
193 .\"O real user ID to the real user ID, the effective user ID, or the
194 .\"O saved set-user-ID.
196 ¤Ç¤Ï¡¢¼Â¸ú¥æ¡¼¥¶ ID ¤ò¼Â¥æ¡¼¥¶ ID ¤â¤·¤¯¤ÏÊݸ set-user-ID ¤È
197 Ʊ¤¸Ãͤˤ¹¤ë¤³¤È¤¬¤Ç¤¤ë¤¬¡¢
198 ÈóÆø¢¥×¥í¥»¥¹¤¬¼Â¥æ¡¼¥¶ ID ¤ò¼Â¥æ¡¼¥¶ ID¡¢¼Â¸ú¥æ¡¼¥¶ ID¡¢
199 Êݸ set-user-ID ¤Î¤É¤ÎÃͤˤâÀßÄê¤Ç¤¤ë¤«¤Ïµ¬Äꤵ¤ì¤Æ¤¤¤Ê¤¤¡£
201 .\"O .BR setregid (),
202 .\"O the real group ID can be changed to the value of the saved set-group-ID,
203 .\"O and the effective group ID can be changed to the value of
204 .\"O the real group ID or the saved set-group-ID.
206 ¤Ç¤Ï¡¢¼Â¥°¥ë¡¼¥× ID ¤òÊݸ set-group-ID ¤ÈƱ¤¸ÃͤËÊѹ¹¤Ç¤¡¢
207 ¼Â¸ú¥°¥ë¡¼¥× ID ¤ò¼Â¥°¥ë¡¼¥× ID ¤äÊݸ set-group-ID ¤ÈƱ¤¸ÃͤËÊѹ¹¤Ç¤¤ë¡£
208 .\"O The precise details of what ID changes are permitted vary
209 .\"O across implementations.
210 ¤É¤Î¤è¤¦¤Ê ID ¤ÎÊѹ¹¤¬Ç§¤á¤é¤ì¤Æ¤¤¤ë¤«¤ÎÀµ³Î¤Ê¾ÜºÙ¤Ï
213 .\"O POSIX.1 makes no specification about the effect of these calls
214 .\"O on the saved set-user-ID and saved set-group-ID.
215 POSIX.1 ¤Ç¤Ï¡¢¤³¤ì¤é¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬Êݸ set-user-ID ¤ä
216 Êݸ set-group-ID ¤ËÍ¿¤¨¤ë±Æ¶Á¤Ë¤Ä¤¤¤Æ¤Ïµ¬Äꤷ¤Æ¤¤¤Ê¤¤¡£
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