| 1 | /* Copyright (C) 1993-2022 Free Software Foundation, Inc. |
|---|
| 2 | This file is part of the GNU C Library. |
|---|
| 3 | |
|---|
| 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. |
|---|
| 8 | |
|---|
| 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. |
|---|
| 13 | |
|---|
| 14 | You should have received a copy of the GNU Lesser General Public |
|---|
| 15 | License along with the GNU C Library; if not, see |
|---|
| 16 | <https://www.gnu.org/licenses/>. */ |
|---|
| 17 | |
|---|
| 18 | #include <errno.h> |
|---|
| 19 | #include <sys/types.h> |
|---|
| 20 | #include <grp.h> |
|---|
| 21 | #include <hurd.h> |
|---|
| 22 | #include <hurd/id.h> |
|---|
| 23 | |
|---|
| 24 | /* Set the group set for the current user to GROUPS (N of them). */ |
|---|
| 25 | int |
|---|
| 26 | setgroups (size_t n, const gid_t *groups) |
|---|
| 27 | { |
|---|
| 28 | error_t err; |
|---|
| 29 | auth_t newauth; |
|---|
| 30 | size_t i; |
|---|
| 31 | gid_t new[n]; |
|---|
| 32 | |
|---|
| 33 | /* Fault before taking locks. */ |
|---|
| 34 | for (i = 0; i < n; ++i) |
|---|
| 35 | new[i] = groups[i]; |
|---|
| 36 | |
|---|
| 37 | retry: |
|---|
| 38 | HURD_CRITICAL_BEGIN; |
|---|
| 39 | __mutex_lock (&_hurd_id.lock); |
|---|
| 40 | err = _hurd_check_ids (); |
|---|
| 41 | if (! err) |
|---|
| 42 | { |
|---|
| 43 | /* Get a new auth port using those IDs. */ |
|---|
| 44 | err = __USEPORT (AUTH, |
|---|
| 45 | __auth_makeauth (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, |
|---|
| 46 | _hurd_id.gen.uids, _hurd_id.gen.nuids, |
|---|
| 47 | _hurd_id.aux.uids, _hurd_id.aux.nuids, |
|---|
| 48 | new, n, |
|---|
| 49 | _hurd_id.aux.gids, _hurd_id.aux.ngids, |
|---|
| 50 | &newauth)); |
|---|
| 51 | } |
|---|
| 52 | __mutex_unlock (&_hurd_id.lock); |
|---|
| 53 | HURD_CRITICAL_END; |
|---|
| 54 | if (err == EINTR) |
|---|
| 55 | /* Got a signal while inside an RPC of the critical section, retry again */ |
|---|
| 56 | goto retry; |
|---|
| 57 | |
|---|
| 58 | if (err) |
|---|
| 59 | return __hurd_fail (err); |
|---|
| 60 | |
|---|
| 61 | /* Install the new auth port and reauthenticate everything. */ |
|---|
| 62 | err = __setauth (newauth); |
|---|
| 63 | __mach_port_deallocate (__mach_task_self (), newauth); |
|---|
| 64 | return err; |
|---|
| 65 | } |
|---|
| 66 | libc_hidden_def (setgroups) |
|---|
| 67 | |
|---|
