1/*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source.  A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12/*
13 * Copyright (c) 2015, Joyent, Inc.
14 */
15
16/*
17 * Test getrandom(2)
18 */
19
20#include <sys/random.h>
21#include <sys/mman.h>
22#include <assert.h>
23#include <errno.h>
24
25int
26main(void)
27{
28	int ret;
29	void *addr;
30	uint8_t buf[32];
31	uint8_t bigbuf[4096];
32
33	/* Go through flags values, start with invalid */
34	ret = getrandom(buf, sizeof (buf), 42);
35	assert(ret == -1);
36	assert(errno == EINVAL);
37
38	ret = getrandom(buf, sizeof (buf), 0);
39	assert(ret >= 0);
40
41	ret = getrandom(buf, sizeof (buf), GRND_NONBLOCK);
42	assert(ret >= 0);
43
44	ret = getrandom(buf, sizeof (buf), GRND_RANDOM);
45	assert(ret >= 0);
46
47	ret = getrandom(buf, sizeof (buf), GRND_RANDOM | GRND_NONBLOCK);
48	assert(ret >= 0);
49
50	ret = getrandom(buf, sizeof (buf), (GRND_RANDOM | GRND_NONBLOCK) << 1);
51	assert(ret == -1);
52	assert(errno == EINVAL);
53
54	/* Bad buffer addresses, eg. EFAULT */
55	ret = getrandom(NULL, sizeof (buf), 0);
56	assert(ret == -1);
57	assert(errno == EFAULT);
58
59	ret = getrandom(NULL, sizeof (buf), GRND_RANDOM);
60	assert(ret == -1);
61	assert(errno == EFAULT);
62
63	/* Jump through a hoop to know we'll always have a bad address */
64	addr = mmap(NULL, 4096, PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0);
65	assert(addr != MAP_FAILED);
66	ret = munmap(addr, 4096);
67	assert(ret == 0);
68	ret = getrandom(addr, sizeof (buf), 0);
69	assert(ret == -1);
70	assert(errno == EFAULT);
71	ret = getrandom(addr, sizeof (buf), GRND_RANDOM);
72	assert(ret == -1);
73	assert(errno == EFAULT);
74
75	/* Verify that we get rounded down on a getrandom of /dev/random */
76	ret = getrandom(bigbuf, sizeof (buf), GRND_RANDOM);
77	assert(ret >= 0 && ret < sizeof (bigbuf));
78
79	/* Do a few simple sets where we know we should get data */
80	ret = getrandom(buf, sizeof (buf), 0);
81	assert(ret == sizeof (buf));
82	ret = getrandom(buf, sizeof (buf), GRND_RANDOM);
83	assert(ret == sizeof (buf));
84
85	return (0);
86}
87