1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/* Copyright (C) 2014 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 <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/syscall.h>
#include <unistd.h>
/* Check that a partial setuid failure aborts the process. */
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond_send;
static void (*func_sent) (void);
static pthread_cond_t cond_recv;
#define FAIL(fmt, ...) \
do { printf ("FAIL: " fmt "\n", __VA_ARGS__); _exit (1); } while (0)
static void *
thread_func (void *ctx __attribute__ ((unused)))
{
int ret = pthread_mutex_lock (&mutex);
if (ret != 0)
FAIL ("pthread_mutex_lock (thread): %d", ret);
while (true)
{
if (func_sent != NULL)
{
void (*func) (void) = func_sent;
ret = pthread_mutex_unlock (&mutex);
if (ret != 0)
FAIL ("pthread_mutex_unlock (thread): %d", ret);
func ();
ret = pthread_mutex_lock (&mutex);
if (ret != 0)
FAIL ("pthread_mutex_lock (thread): %d", ret);
func_sent = NULL;
ret = pthread_cond_signal (&cond_recv);
if (ret != 0)
FAIL ("pthread_cond_signal (recv): %d", ret);
}
ret = pthread_cond_wait (&cond_send, &mutex);
if (ret != 0)
FAIL ("pthread_cond_wait (send): %d", ret);
}
return NULL;
}
static void
run_on_thread (void (*func) (void))
{
int ret = pthread_mutex_lock (&mutex);
if (ret != 0)
FAIL ("pthread_mutex_lock (%s): %d", __func__, ret);
func_sent = func;
ret = pthread_mutex_unlock (&mutex);
if (ret != 0)
FAIL ("pthread_mutex_unlock (%s): %d", __func__, ret);
ret = pthread_cond_signal (&cond_send);
if (ret != 0)
FAIL ("pthread_mutex_lock (%s): %d", __func__, ret);
ret = pthread_mutex_lock (&mutex);
if (ret != 0)
FAIL ("pthread_mutex_lock (%s): %d", __func__, ret);
while (func_sent != NULL)
{
ret = pthread_cond_wait (&cond_recv, &mutex);
if (ret != 0)
FAIL ("pthread_mutex_wait (%s): %d", __func__, ret);
}
ret = pthread_mutex_unlock (&mutex);
if (ret != 0)
FAIL ("pthread_mutex_unlock (%s): %d", __func__, ret);
}
static void
change_thread_ids (void)
{
long ret = syscall (__NR_setresuid, 2001, 2002, 2003);
if (ret != 0)
FAIL ("setresuid (2001, 2002, 2003): %ld", ret);
}
static uid_t ruid, euid, suid;
static void
get_thread_ids (void)
{
if (getresuid (&ruid, &euid, &suid) < 0)
FAIL ("getresuid: %m (%d)", errno);
}
static void
abort_expected (int signal __attribute__ ((unused)))
{
_exit (0);
}
static int
do_test (void)
{
pthread_t thread;
int ret = pthread_create (&thread, NULL, thread_func, NULL);
if (ret != 0)
FAIL ("pthread_create: %d", ret);
run_on_thread (change_thread_ids);
signal (SIGABRT, &abort_expected);
/* This should abort the process. */
if (setresuid (1001, 1002, 1003) < 0)
FAIL ("setresuid: %m (%d)", errno);
signal (SIGABRT, SIG_DFL);
/* If we get here, check that the kernel did the right thing. */
run_on_thread (get_thread_ids);
if (ruid != 1001 || euid != 1002 || euid != 1003)
FAIL ("unexpected UIDs after setuid: %ld, %ld, %ld",
(long) ruid, (long) euid, (long) suid);
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
|
