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/* Test that setuid, pthread_create, thread exit do not deadlock (bug 28361).
Copyright (C) 2021-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <support/check.h>
#include <support/xthread.h>
#include <unistd.h>
/* How many threads to launch during each iteration. */
enum { threads = 4 };
/* How many iterations to perform. This value seems to reproduce
bug 28361 in a bout one in three runs. */
enum { iterations = 5000 };
/* Cache of the real user ID used by setuid_thread. */
static uid_t uid;
/* Start routine for the threads. */
static void *
setuid_thread (void *closure)
{
TEST_COMPARE (setuid (uid), 0);
return NULL;
}
static int
do_test (void)
{
/* The setxid machinery is still invoked even if the UID is
unchanged. (The kernel might reset other credentials as part of
the system call.) */
uid = getuid ();
for (int i = 0; i < iterations; ++i)
{
pthread_t thread_ids[threads];
for (int j = 0; j < threads; ++j)
thread_ids[j] = xpthread_create (NULL, setuid_thread, NULL);
for (int j = 0; j < threads; ++j)
xpthread_join (thread_ids[j]);
}
return 0;
}
#include <support/test-driver.c>
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