62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* Test that setuid, pthread_create, thread exit do not deadlock (bug 28361).
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Copyright (C) 2021-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/check.h>
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#include <support/xthread.h>
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#include <unistd.h>
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/* How many threads to launch during each iteration. */
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enum { threads = 4 };
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/* How many iterations to perform. This value seems to reproduce
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bug 28361 in a bout one in three runs. */
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enum { iterations = 5000 };
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/* Cache of the real user ID used by setuid_thread. */
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static uid_t uid;
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/* Start routine for the threads. */
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static void *
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setuid_thread (void *closure)
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{
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TEST_COMPARE (setuid (uid), 0);
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return NULL;
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}
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static int
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do_test (void)
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{
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/* The setxid machinery is still invoked even if the UID is
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unchanged. (The kernel might reset other credentials as part of
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the system call.) */
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uid = getuid ();
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for (int i = 0; i < iterations; ++i)
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{
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pthread_t thread_ids[threads];
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for (int j = 0; j < threads; ++j)
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thread_ids[j] = xpthread_create (NULL, setuid_thread, NULL);
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for (int j = 0; j < threads; ++j)
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xpthread_join (thread_ids[j]);
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}
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return 0;
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}
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#include <support/test-driver.c>
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