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