2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/random.h>
40 static const unsigned valid_flags[] = { 0, GRND_NONBLOCK, GRND_RANDOM,
41 GRND_NONBLOCK | GRND_RANDOM };
43 ATF_TC_WITHOUT_HEAD(getrandom_randomness);
44 ATF_TC_BODY(getrandom_randomness, tc)
46 char randomb[4096], compressed[5000];
51 for (i = 0; i < nitems(valid_flags); i++) {
52 mode = valid_flags[i];
54 /* Get new random data, filling randomb. */
56 memset(randomb, 0, sizeof(randomb));
58 for (j = 0; j < sizeof(randomb);) {
59 ret = getrandom(&randomb[j], sizeof(randomb) - j, mode);
60 if (ret < 0 && (mode & GRND_NONBLOCK) != 0 &&
64 ATF_REQUIRE_MSG(ret >= 0, "other error: %d", errno);
65 ATF_REQUIRE_MSG(ret > 0, "bogus zero return");
70 /* Perform compressibility test */
71 c = ZSTD_compress(compressed, sizeof(compressed), randomb,
72 sizeof(randomb), ZSTD_maxCLevel());
73 ATF_REQUIRE_MSG(!ZSTD_isError(c), "zstd compress: %s",
74 ZSTD_getErrorName(c));
77 * If the output is very compressible, it's probably not random
79 ATF_REQUIRE_MSG(c > (sizeof(randomb) * 4 / 5),
80 "purportedly random data was compressible: %zu/%zu or %f%%",
81 c, sizeof(randomb), (double)c / (double)sizeof(randomb));
85 ATF_TC_WITHOUT_HEAD(getrandom_fault);
86 ATF_TC_BODY(getrandom_fault, tc)
90 ret = getrandom(NULL, 1, 0);
91 ATF_REQUIRE_EQ(ret, -1);
92 ATF_REQUIRE_EQ(errno, EFAULT);
95 ATF_TC_WITHOUT_HEAD(getrandom_count);
96 ATF_TC_BODY(getrandom_count, tc)
98 char buf[4096], reference[4096];
101 /* getrandom(2) does not modify buf past the requested length */
102 _Static_assert(sizeof(reference) == sizeof(buf), "must match");
103 memset(reference, 0x7C, sizeof(reference));
105 memset(buf, 0x7C, sizeof(buf));
106 ret = getrandom(buf, 1, 0);
107 ATF_REQUIRE_EQ(ret, 1);
108 ATF_REQUIRE_EQ(memcmp(&buf[1], reference, sizeof(reference) - 1), 0);
110 memset(buf, 0x7C, sizeof(buf));
111 ATF_REQUIRE_EQ(getrandom(buf, 15, 0), 15);
112 ATF_REQUIRE_EQ(memcmp(&buf[15], reference, sizeof(reference) - 15), 0);
114 memset(buf, 0x7C, sizeof(buf));
115 ATF_REQUIRE_EQ(getrandom(buf, 255, 0), 255);
116 ATF_REQUIRE_EQ(memcmp(&buf[255], reference, sizeof(reference) - 255), 0);
118 memset(buf, 0x7C, sizeof(buf));
119 ATF_REQUIRE_EQ(getrandom(buf, 4095, 0), 4095);
120 ATF_REQUIRE_EQ(memcmp(&buf[4095], reference, sizeof(reference) - 4095), 0);
126 ATF_TP_ADD_TC(tp, getrandom_count);
127 ATF_TP_ADD_TC(tp, getrandom_fault);
128 ATF_TP_ADD_TC(tp, getrandom_randomness);
129 return (atf_no_error());