1 /* Copyright (C) 1991, 92, 93, 94, 95, 97 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #include <sys/types.h>
26 /* Set the user ID of the calling process to UID.
27 If the calling process is the super-user, the real
28 and effective user IDs, and the saved set-user-ID to UID;
29 if not, the effective user ID is set to UID. */
38 __mutex_lock (&_hurd_id.lock);
39 err = _hurd_check_ids ();
43 /* Make a new auth handle which has UID as the real uid,
44 and as the first element in the list of effective uids. */
46 uid_t *newgen, *newaux, auxbuf[2];
49 newaux = _hurd_id.aux.uids;
50 naux = _hurd_id.aux.nuids;
51 if (_hurd_id.gen.nuids == 0)
53 /* No effective uids now. The new set will be just UID. */
57 else if (_hurd_id.gen.uids[0] == 0)
59 /* We are root; set the effective, real, and saved to UID. */
60 _hurd_id.gen.uids[0] = uid;
62 newgen = _hurd_id.gen.uids;
63 ngen = _hurd_id.gen.nuids;
64 if (_hurd_id.aux.nuids < 2)
69 newaux[0] = newaux[1] = uid;
73 /* We are not root; just change the effective UID. */
74 /* XXX that implies an unprivileged setuid(0) will give
75 the caller root, no questions asked! */
76 _hurd_id.gen.uids[0] = uid;
78 newgen = _hurd_id.gen.uids;
79 ngen = _hurd_id.gen.nuids;
82 err = __USEPORT (AUTH, __auth_makeauth
83 (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
84 newgen, ngen, newaux, naux,
85 _hurd_id.gen.gids, _hurd_id.gen.ngids,
86 _hurd_id.aux.gids, _hurd_id.aux.ngids,
89 __mutex_unlock (&_hurd_id.lock);
93 return __hurd_fail (err);
95 /* Install the new handle and reauthenticate everything. */
96 err = __setauth (newauth);
97 __mach_port_deallocate (__mach_task_self (), newauth);
101 weak_alias (__setuid, setuid)