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114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/* Copyright (C) 2014-2025 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 <errno.h>
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#include <pthread.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <support/check.h>
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/* The test must run under a non-privileged user ID. */
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static const uid_t test_uid = 1;
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static pthread_barrier_t barrier1;
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static pthread_barrier_t barrier2;
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/* True if x is not a successful return code from pthread_barrier_wait. */
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static inline bool
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is_invalid_barrier_ret (int x)
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{
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return x != 0 && x != PTHREAD_BARRIER_SERIAL_THREAD;
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}
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static void *
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thread_func (void *ctx __attribute__ ((unused)))
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{
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int ret = pthread_barrier_wait (&barrier1);
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if (is_invalid_barrier_ret (ret))
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FAIL_EXIT1 ("pthread_barrier_wait (barrier1) (on thread): %d", ret);
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ret = pthread_barrier_wait (&barrier2);
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if (is_invalid_barrier_ret (ret))
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FAIL_EXIT1 ("pthread_barrier_wait (barrier2) (on thread): %d", ret);
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return NULL;
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}
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static void
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setuid_failure (int phase)
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{
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int ret = setuid (0);
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switch (ret)
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{
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case 0:
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FAIL_EXIT1 ("setuid succeeded unexpectedly in phase %d", phase);
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case -1:
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if (errno != EPERM)
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FAIL_EXIT1 ("setuid phase %d: %m", phase);
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break;
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default:
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FAIL_EXIT1 ("invalid setuid return value in phase %d: %d", phase, ret);
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}
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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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if (getuid () == 0)
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if (setuid (test_uid) != 0)
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FAIL_EXIT1 ("setuid (%u): %m", (unsigned) test_uid);
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if (setuid (getuid ()))
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FAIL_EXIT1 ("setuid (%s): %m", "getuid ()");
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setuid_failure (1);
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int ret = pthread_barrier_init (&barrier1, NULL, 2);
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if (ret != 0)
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FAIL_EXIT1 ("pthread_barrier_init (barrier1): %d", ret);
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ret = pthread_barrier_init (&barrier2, NULL, 2);
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if (ret != 0)
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FAIL_EXIT1 ("pthread_barrier_init (barrier2): %d", ret);
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pthread_t thread;
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ret = pthread_create (&thread, NULL, thread_func, NULL);
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if (ret != 0)
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FAIL_EXIT1 ("pthread_create: %d", ret);
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/* Ensure that the thread is running properly. */
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ret = pthread_barrier_wait (&barrier1);
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if (is_invalid_barrier_ret (ret))
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FAIL_EXIT1 ("pthread_barrier_wait (barrier1): %d", ret);
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setuid_failure (2);
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/* Check success case. */
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if (setuid (getuid ()) != 0)
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FAIL_EXIT1 ("setuid (%s): %m", "getuid ()");
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/* Shutdown. */
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ret = pthread_barrier_wait (&barrier2);
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if (is_invalid_barrier_ret (ret))
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FAIL_EXIT1 ("pthread_barrier_wait (barrier2): %d", ret);
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ret = pthread_join (thread, NULL);
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if (ret != 0)
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FAIL_EXIT1 ("pthread_join: %d", ret);
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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