summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/clone3/clone3.c
blob: 3c9bf0cd82a80dfe4189e273efbd9693f4f61b22 (plain)
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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
// 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 <stdbool.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"

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_NO_TEST:
		/*
		 * Uses default 'flags' and 'SIGCHLD'
		 * assignment.
		 */
		break;
	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 bool 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_print_msg(
			"[%d] Result (%d) is different than expected (%d)\n",
			getpid(), ret, expected);
		return false;
	}

	return true;
}

typedef bool (*filter_function)(void);
typedef size_t (*size_function)(void);

static bool not_root(void)
{
	if (getuid() != 0) {
		ksft_print_msg("Not running as root\n");
		return true;
	}

	return false;
}

static bool no_timenamespace(void)
{
	if (not_root())
		return true;

	if (!access("/proc/self/ns/time", F_OK))
		return false;

	ksft_print_msg("Time namespaces are not supported\n");
	return true;
}

static size_t page_size_plus_8(void)
{
	return getpagesize() + 8;
}

struct test {
	const char *name;
	uint64_t flags;
	size_t size;
	size_function size_function;
	int expected;
	enum test_mode test_mode;
	filter_function filter;
};

static const struct test tests[] = {
	{
		.name = "simple clone3()",
		.flags = 0,
		.size = 0,
		.expected = 0,
		.test_mode = CLONE3_ARGS_NO_TEST,
	},
	{
		.name = "clone3() in a new PID_NS",
		.flags = CLONE_NEWPID,
		.size = 0,
		.expected = 0,
		.test_mode = CLONE3_ARGS_NO_TEST,
		.filter = not_root,
	},
	{
		.name = "CLONE_ARGS_SIZE_VER0",
		.flags = 0,
		.size = CLONE_ARGS_SIZE_VER0,
		.expected = 0,
		.test_mode = CLONE3_ARGS_NO_TEST,
	},
	{
		.name = "CLONE_ARGS_SIZE_VER0 - 8",
		.flags = 0,
		.size = CLONE_ARGS_SIZE_VER0 - 8,
		.expected = -EINVAL,
		.test_mode = CLONE3_ARGS_NO_TEST,
	},
	{
		.name = "sizeof(struct clone_args) + 8",
		.flags = 0,
		.size = sizeof(struct __clone_args) + 8,
		.expected = 0,
		.test_mode = CLONE3_ARGS_NO_TEST,
	},
	{
		.name = "exit_signal with highest 32 bits non-zero",
		.flags = 0,
		.size = 0,
		.expected = -EINVAL,
		.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG,
	},
	{
		.name = "negative 32-bit exit_signal",
		.flags = 0,
		.size = 0,
		.expected = -EINVAL,
		.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG,
	},
	{
		.name = "exit_signal not fitting into CSIGNAL mask",
		.flags = 0,
		.size = 0,
		.expected = -EINVAL,
		.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG,
	},
	{
		.name = "NSIG < exit_signal < CSIG",
		.flags = 0,
		.size = 0,
		.expected = -EINVAL,
		.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG,
	},
	{
		.name = "Arguments sizeof(struct clone_args) + 8",
		.flags = 0,
		.size = sizeof(struct __clone_args) + 8,
		.expected = 0,
		.test_mode = CLONE3_ARGS_ALL_0,
	},
	{
		.name = "Arguments sizeof(struct clone_args) + 16",
		.flags = 0,
		.size = sizeof(struct __clone_args) + 16,
		.expected = -E2BIG,
		.test_mode = CLONE3_ARGS_ALL_0,
	},
	{
		.name = "Arguments sizeof(struct clone_arg) * 2",
		.flags = 0,
		.size = sizeof(struct __clone_args) + 16,
		.expected = -E2BIG,
		.test_mode = CLONE3_ARGS_ALL_0,
	},
	{
		.name = "Arguments > page size",
		.flags = 0,
		.size_function = page_size_plus_8,
		.expected = -E2BIG,
		.test_mode = CLONE3_ARGS_NO_TEST,
	},
	{
		.name = "CLONE_ARGS_SIZE_VER0 in a new PID NS",
		.flags = CLONE_NEWPID,
		.size = CLONE_ARGS_SIZE_VER0,
		.expected = 0,
		.test_mode = CLONE3_ARGS_NO_TEST,
		.filter = not_root,
	},
	{
		.name = "CLONE_ARGS_SIZE_VER0 - 8 in a new PID NS",
		.flags = CLONE_NEWPID,
		.size = CLONE_ARGS_SIZE_VER0 - 8,
		.expected = -EINVAL,
		.test_mode = CLONE3_ARGS_NO_TEST,
	},
	{
		.name = "sizeof(struct clone_args) + 8 in a new PID NS",
		.flags = CLONE_NEWPID,
		.size = sizeof(struct __clone_args) + 8,
		.expected = 0,
		.test_mode = CLONE3_ARGS_NO_TEST,
		.filter = not_root,
	},
	{
		.name = "Arguments > page size in a new PID NS",
		.flags = CLONE_NEWPID,
		.size_function = page_size_plus_8,
		.expected = -E2BIG,
		.test_mode = CLONE3_ARGS_NO_TEST,
	},
	{
		.name = "New time NS",
		.flags = CLONE_NEWTIME,
		.size = 0,
		.expected = 0,
		.test_mode = CLONE3_ARGS_NO_TEST,
		.filter = no_timenamespace,
	},
	{
		.name = "exit signal (SIGCHLD) in flags",
		.flags = SIGCHLD,
		.size = 0,
		.expected = -EINVAL,
		.test_mode = CLONE3_ARGS_NO_TEST,
	},
};

int main(int argc, char *argv[])
{
	size_t size;
	int i;

	ksft_print_header();
	ksft_set_plan(ARRAY_SIZE(tests));
	test_clone3_supported();

	for (i = 0; i < ARRAY_SIZE(tests); i++) {
		if (tests[i].filter && tests[i].filter()) {
			ksft_test_result_skip("%s\n", tests[i].name);
			continue;
		}

		if (tests[i].size_function)
			size = tests[i].size_function();
		else
			size = tests[i].size;

		ksft_print_msg("Running test '%s'\n", tests[i].name);

		ksft_test_result(test_clone3(tests[i].flags, size,
					     tests[i].expected,
					     tests[i].test_mode),
				 "%s\n", tests[i].name);
	}

	ksft_finished();
}