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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
// SPDX-License-Identifier: GPL-2.0
/* Based on Christian Brauner's clone3() example */
#define _GNU_SOURCE
#include <errno.h>
#include <inttypes.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sched.h>
#include "../kselftest.h"
#include "clone3_selftests.h"
/*
* Different sizes of struct clone_args
*/
#ifndef CLONE3_ARGS_SIZE_V0
#define CLONE3_ARGS_SIZE_V0 64
#endif
enum test_mode {
CLONE3_ARGS_NO_TEST,
CLONE3_ARGS_ALL_0,
CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG,
CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG,
CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG,
CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG,
};
static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode)
{
struct clone_args args = {
.flags = flags,
.exit_signal = SIGCHLD,
};
struct clone_args_extended {
struct clone_args args;
__aligned_u64 excess_space[2];
} args_ext;
pid_t pid = -1;
int status;
memset(&args_ext, 0, sizeof(args_ext));
if (size > sizeof(struct clone_args))
args_ext.excess_space[1] = 1;
if (size == 0)
size = sizeof(struct clone_args);
switch (test_mode) {
case CLONE3_ARGS_ALL_0:
args.flags = 0;
args.exit_signal = 0;
break;
case CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG:
args.exit_signal = 0xbadc0ded00000000ULL;
break;
case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG:
args.exit_signal = 0x0000000080000000ULL;
break;
case CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG:
args.exit_signal = 0x0000000000000100ULL;
break;
case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG:
args.exit_signal = 0x00000000000000f0ULL;
break;
}
memcpy(&args_ext.args, &args, sizeof(struct clone_args));
pid = sys_clone3((struct clone_args *)&args_ext, size);
if (pid < 0) {
ksft_print_msg("%s - Failed to create new process\n",
strerror(errno));
return -errno;
}
if (pid == 0) {
ksft_print_msg("I am the child, my PID is %d\n", getpid());
_exit(EXIT_SUCCESS);
}
ksft_print_msg("I am the parent (%d). My child's pid is %d\n",
getpid(), pid);
if (waitpid(-1, &status, __WALL) < 0) {
ksft_print_msg("Child returned %s\n", strerror(errno));
return -errno;
}
if (WEXITSTATUS(status))
return WEXITSTATUS(status);
return 0;
}
static void test_clone3(uint64_t flags, size_t size, int expected,
enum test_mode test_mode)
{
int ret;
ksft_print_msg(
"[%d] Trying clone3() with flags %#" PRIx64 " (size %zu)\n",
getpid(), flags, size);
ret = call_clone3(flags, size, test_mode);
ksft_print_msg("[%d] clone3() with flags says: %d expected %d\n",
getpid(), ret, expected);
if (ret != expected)
ksft_test_result_fail(
"[%d] Result (%d) is different than expected (%d)\n",
getpid(), ret, expected);
else
ksft_test_result_pass(
"[%d] Result (%d) matches expectation (%d)\n",
getpid(), ret, expected);
}
int main(int argc, char *argv[])
{
pid_t pid;
uid_t uid = getuid();
test_clone3_supported();
ksft_print_header();
ksft_set_plan(17);
/* Just a simple clone3() should return 0.*/
test_clone3(0, 0, 0, CLONE3_ARGS_NO_TEST);
/* Do a clone3() in a new PID NS.*/
if (uid == 0)
test_clone3(CLONE_NEWPID, 0, 0, CLONE3_ARGS_NO_TEST);
else
ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n");
/* Do a clone3() with CLONE3_ARGS_SIZE_V0. */
test_clone3(0, CLONE3_ARGS_SIZE_V0, 0, CLONE3_ARGS_NO_TEST);
/* Do a clone3() with CLONE3_ARGS_SIZE_V0 - 8 */
test_clone3(0, CLONE3_ARGS_SIZE_V0 - 8, -EINVAL, CLONE3_ARGS_NO_TEST);
/* Do a clone3() with sizeof(struct clone_args) + 8 */
test_clone3(0, sizeof(struct clone_args) + 8, 0, CLONE3_ARGS_NO_TEST);
/* Do a clone3() with exit_signal having highest 32 bits non-zero */
test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG);
/* Do a clone3() with negative 32-bit exit_signal */
test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG);
/* Do a clone3() with exit_signal not fitting into CSIGNAL mask */
test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG);
/* Do a clone3() with NSIG < exit_signal < CSIG */
test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG);
test_clone3(0, sizeof(struct clone_args) + 8, 0, CLONE3_ARGS_ALL_0);
test_clone3(0, sizeof(struct clone_args) + 16, -E2BIG,
CLONE3_ARGS_ALL_0);
test_clone3(0, sizeof(struct clone_args) * 2, -E2BIG,
CLONE3_ARGS_ALL_0);
/* Do a clone3() with > page size */
test_clone3(0, getpagesize() + 8, -E2BIG, CLONE3_ARGS_NO_TEST);
/* Do a clone3() with CLONE3_ARGS_SIZE_V0 in a new PID NS. */
if (uid == 0)
test_clone3(CLONE_NEWPID, CLONE3_ARGS_SIZE_V0, 0,
CLONE3_ARGS_NO_TEST);
else
ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n");
/* Do a clone3() with CLONE3_ARGS_SIZE_V0 - 8 in a new PID NS */
test_clone3(CLONE_NEWPID, CLONE3_ARGS_SIZE_V0 - 8, -EINVAL,
CLONE3_ARGS_NO_TEST);
/* Do a clone3() with sizeof(struct clone_args) + 8 in a new PID NS */
if (uid == 0)
test_clone3(CLONE_NEWPID, sizeof(struct clone_args) + 8, 0,
CLONE3_ARGS_NO_TEST);
else
ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n");
/* Do a clone3() with > page size in a new PID NS */
test_clone3(CLONE_NEWPID, getpagesize() + 8, -E2BIG,
CLONE3_ARGS_NO_TEST);
return !ksft_get_fail_cnt() ? ksft_exit_pass() : ksft_exit_fail();
}
|
