1 | /* Test that setuid, pthread_create, thread exit do not deadlock (bug 28361). |
2 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <support/check.h> |
20 | #include <support/xthread.h> |
21 | #include <unistd.h> |
22 | |
23 | /* How many threads to launch during each iteration. */ |
24 | enum { threads = 4 }; |
25 | |
26 | /* How many iterations to perform. This value seems to reproduce |
27 | bug 28361 in a bout one in three runs. */ |
28 | enum { iterations = 5000 }; |
29 | |
30 | /* Cache of the real user ID used by setuid_thread. */ |
31 | static uid_t uid; |
32 | |
33 | /* Start routine for the threads. */ |
34 | static void * |
35 | setuid_thread (void *closure) |
36 | { |
37 | TEST_COMPARE (setuid (uid), 0); |
38 | return NULL; |
39 | } |
40 | |
41 | static int |
42 | do_test (void) |
43 | { |
44 | /* The setxid machinery is still invoked even if the UID is |
45 | unchanged. (The kernel might reset other credentials as part of |
46 | the system call.) */ |
47 | uid = getuid (); |
48 | |
49 | for (int i = 0; i < iterations; ++i) |
50 | { |
51 | pthread_t thread_ids[threads]; |
52 | for (int j = 0; j < threads; ++j) |
53 | thread_ids[j] = xpthread_create (NULL, thread_func: setuid_thread, NULL); |
54 | for (int j = 0; j < threads; ++j) |
55 | xpthread_join (thr: thread_ids[j]); |
56 | } |
57 | |
58 | return 0; |
59 | } |
60 | |
61 | #include <support/test-driver.c> |
62 | |