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glibc/nptl/tst-setuid3.c
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/* Copyright (C) 2014-2016 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 | |
<http://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" |