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/* Copyright (C) 2014-2020 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 <stdio.h>
#include <errno.h>
#include <pthread.h>
#include <stdbool.h>
#include <unistd.h>
/* The test must run under a non-privileged user ID. */
static const uid_t test_uid = 1;
static pthread_barrier_t barrier1;
static pthread_barrier_t barrier2;
#define FAIL(fmt, ...) \
do { printf ("FAIL: " fmt "\n", __VA_ARGS__); _exit (1); } while (0)
#define FAIL_ERR(fmt, ...) \
do { printf ("FAIL: " fmt ": %m\n", __VA_ARGS__); _exit (1); } while (0)
/* True if x is not a successful return code from pthread_barrier_wait. */
static inline bool
is_invalid_barrier_ret (int x)
{
return x != 0 && x != PTHREAD_BARRIER_SERIAL_THREAD;
}
static void *
thread_func (void *ctx __attribute__ ((unused)))
{
int ret = pthread_barrier_wait (&barrier1);
if (is_invalid_barrier_ret (ret))
FAIL ("pthread_barrier_wait (barrier1) (on thread): %d", ret);
ret = pthread_barrier_wait (&barrier2);
if (is_invalid_barrier_ret (ret))
FAIL ("pthread_barrier_wait (barrier2) (on thread): %d", ret);
return NULL;
}
static void
setuid_failure (int phase)
{
int ret = setuid (0);
switch (ret)
{
case 0:
FAIL ("setuid succeeded unexpectedly in phase %d", phase);
case -1:
if (errno != EPERM)
FAIL_ERR ("setuid phase %d", phase);
break;
default:
FAIL ("invalid setuid return value in phase %d: %d", phase, ret);
}
}
static int
do_test (void)
{
if (getuid () == 0)
if (setuid (test_uid) != 0)
FAIL_ERR ("setuid (%u)", (unsigned) test_uid);
if (setuid (getuid ()))
FAIL_ERR ("setuid (%s)", "getuid ()");
setuid_failure (1);
int ret = pthread_barrier_init (&barrier1, NULL, 2);
if (ret != 0)
FAIL ("pthread_barrier_init (barrier1): %d", ret);
ret = pthread_barrier_init (&barrier2, NULL, 2);
if (ret != 0)
FAIL ("pthread_barrier_init (barrier2): %d", ret);
pthread_t thread;
ret = pthread_create (&thread, NULL, thread_func, NULL);
if (ret != 0)
FAIL ("pthread_create: %d", ret);
/* Ensure that the thread is running properly. */
ret = pthread_barrier_wait (&barrier1);
if (is_invalid_barrier_ret (ret))
FAIL ("pthread_barrier_wait (barrier1): %d", ret);
setuid_failure (2);
/* Check success case. */
if (setuid (getuid ()) != 0)
FAIL_ERR ("setuid (%s)", "getuid ()");
/* Shutdown. */
ret = pthread_barrier_wait (&barrier2);
if (is_invalid_barrier_ret (ret))
FAIL ("pthread_barrier_wait (barrier2): %d", ret);
ret = pthread_join (thread, NULL);
if (ret != 0)
FAIL ("pthread_join: %d", ret);
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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