projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| bfff8b1b | 1 | /* Copyright (C) 1991-2017 Free Software Foundation, Inc. |
| ebbad4cc | 2 | This file is part of the GNU C Library. |
| 28f540f4 | 3 | |
| ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
| 41bdb6e2 AJ |
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. | |
| 28f540f4 | 8 | |
| ebbad4cc UD |
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 | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| 28f540f4 | 13 | |
| 41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| 28f540f4 | 17 | |
| 28f540f4 RM |
18 | #include <errno.h> |
| 19 | #include <unistd.h> | |
| 20 | #include <sys/types.h> | |
| 21 | #include <hurd.h> | |
| 22 | #include <hurd/id.h> | |
| 23 | #include <string.h> | |
| 24 | ||
| 25 | /* Set the group ID of the calling process to UID. | |
| 26 | If the calling process is the super-user, the real | |
| 27 | and effective group IDs, and the saved set-group-ID to UID; | |
| 28 | if not, the effective group ID is set to GID. */ | |
| 29 | int | |
| bd2260a2 | 30 | __setgid (gid_t gid) |
| 28f540f4 RM |
31 | { |
| 32 | auth_t newauth; | |
| 33 | error_t err; | |
| 34 | ||
| 35 | HURD_CRITICAL_BEGIN; | |
| 36 | __mutex_lock (&_hurd_id.lock); | |
| 37 | err = _hurd_check_ids (); | |
| 38 | ||
| 39 | if (!err) | |
| 40 | { | |
| 41 | /* Make a new auth handle which has GID as the real gid, | |
| 42 | and as the first element in the list of effective gids. */ | |
| 43 | ||
| 97532098 RM |
44 | gid_t *newgen, *newaux, auxbuf[2]; |
| 45 | size_t ngen, naux; | |
| 46 | ||
| 97532098 RM |
47 | if (_hurd_id.gen.ngids == 0) |
| 48 | { | |
| 49 | /* No effective gids now. The new set will be just GID. */ | |
| 50 | newgen = &gid; | |
| 51 | ngen = 1; | |
| 52 | } | |
| 6df1b247 | 53 | else |
| 97532098 | 54 | { |
| 97532098 RM |
55 | _hurd_id.gen.gids[0] = gid; |
| 56 | _hurd_id.valid = 0; | |
| 57 | newgen = _hurd_id.gen.gids; | |
| 58 | ngen = _hurd_id.gen.ngids; | |
| 6df1b247 RM |
59 | } |
| 60 | ||
| 61 | newaux = _hurd_id.aux.gids; | |
| 62 | naux = _hurd_id.aux.ngids; | |
| 63 | if (_hurd_id.gen.nuids > 0 && _hurd_id.gen.uids[0] == 0) | |
| 64 | { | |
| 65 | /* We are root; set the real and saved IDs too. */ | |
| 66 | _hurd_id.valid = 0; | |
| 97532098 RM |
67 | if (_hurd_id.aux.ngids < 2) |
| 68 | { | |
| 69 | newaux = auxbuf; | |
| 70 | naux = 2; | |
| 71 | } | |
| 2114e10a | 72 | newaux[0] = newaux[1] = gid; |
| 97532098 | 73 | } |
| 28f540f4 RM |
74 | |
| 75 | err = __USEPORT (AUTH, __auth_makeauth | |
| 995069ee | 76 | (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, |
| 6df1b247 RM |
77 | _hurd_id.gen.uids, _hurd_id.gen.nuids, |
| 78 | _hurd_id.aux.uids, _hurd_id.aux.nuids, | |
| 97532098 | 79 | newgen, ngen, newaux, naux, |
| 28f540f4 RM |
80 | &newauth)); |
| 81 | } | |
| 82 | __mutex_unlock (&_hurd_id.lock); | |
| 83 | HURD_CRITICAL_END; | |
| 84 | ||
| 85 | if (err) | |
| 86 | return __hurd_fail (err); | |
| 87 | ||
| 88 | /* Install the new handle and reauthenticate everything. */ | |
| 89 | err = __setauth (newauth); | |
| 90 | __mach_port_deallocate (__mach_task_self (), newauth); | |
| 91 | return err; | |
| 92 | } | |
| 93 | ||
| 94 | weak_alias (__setgid, setgid) |