1 /* Test that setuid, pthread_create, thread exit do not deadlock (bug 28361). 2 Copyright (C) 2021-2022 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 * setuid_thread(void * closure)35setuid_thread (void *closure) 36 { 37 TEST_COMPARE (setuid (uid), 0); 38 return NULL; 39 } 40 41 static int do_test(void)42do_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, setuid_thread, NULL); 54 for (int j = 0; j < threads; ++j) 55 xpthread_join (thread_ids[j]); 56 } 57 58 return 0; 59 } 60 61 #include <support/test-driver.c> 62