diff options
Diffstat (limited to 'tests/sys/kern/sys_getrandom.c')
| -rw-r--r-- | tests/sys/kern/sys_getrandom.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/tests/sys/kern/sys_getrandom.c b/tests/sys/kern/sys_getrandom.c new file mode 100644 index 000000000000..6b6553bbdaac --- /dev/null +++ b/tests/sys/kern/sys_getrandom.c @@ -0,0 +1,127 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/random.h> +#include <errno.h> + +#include <atf-c.h> + +#include <zstd.h> + +static const unsigned valid_flags[] = { 0, GRND_NONBLOCK, GRND_RANDOM, + GRND_NONBLOCK | GRND_RANDOM }; + +ATF_TC_WITHOUT_HEAD(getrandom_randomness); +ATF_TC_BODY(getrandom_randomness, tc) +{ + char randomb[4096], compressed[5000]; + ssize_t ret; + size_t i, j, c; + unsigned mode; + + for (i = 0; i < nitems(valid_flags); i++) { + mode = valid_flags[i]; + + /* Get new random data, filling randomb. */ + + memset(randomb, 0, sizeof(randomb)); + + for (j = 0; j < sizeof(randomb);) { + ret = getrandom(&randomb[j], sizeof(randomb) - j, mode); + if (ret < 0 && (mode & GRND_NONBLOCK) != 0 && + errno == EAGAIN) + continue; + + ATF_REQUIRE_MSG(ret >= 0, "other error: %d", errno); + ATF_REQUIRE_MSG(ret > 0, "bogus zero return"); + + j += (size_t)ret; + } + + /* Perform compressibility test */ + c = ZSTD_compress(compressed, sizeof(compressed), randomb, + sizeof(randomb), ZSTD_maxCLevel()); + ATF_REQUIRE_MSG(!ZSTD_isError(c), "zstd compress: %s", + ZSTD_getErrorName(c)); + + /* + * If the output is very compressible, it's probably not random + */ + ATF_REQUIRE_MSG(c > (sizeof(randomb) * 4 / 5), + "purportedly random data was compressible: %zu/%zu or %f%%", + c, sizeof(randomb), (double)c / (double)sizeof(randomb)); + } +} + +ATF_TC_WITHOUT_HEAD(getrandom_fault); +ATF_TC_BODY(getrandom_fault, tc) +{ + ssize_t ret; + + ret = getrandom(NULL, 1, 0); + ATF_REQUIRE_EQ(ret, -1); + ATF_REQUIRE_EQ(errno, EFAULT); +} + +ATF_TC_WITHOUT_HEAD(getrandom_count); +ATF_TC_BODY(getrandom_count, tc) +{ + char buf[4096], reference[4096]; + ssize_t ret; + + /* getrandom(2) does not modify buf past the requested length */ + _Static_assert(sizeof(reference) == sizeof(buf), "must match"); + memset(reference, 0x7C, sizeof(reference)); + + memset(buf, 0x7C, sizeof(buf)); + ret = getrandom(buf, 1, 0); + ATF_REQUIRE_EQ(ret, 1); + ATF_REQUIRE_EQ(memcmp(&buf[1], reference, sizeof(reference) - 1), 0); + + memset(buf, 0x7C, sizeof(buf)); + ATF_REQUIRE_EQ(getrandom(buf, 15, 0), 15); + ATF_REQUIRE_EQ(memcmp(&buf[15], reference, sizeof(reference) - 15), 0); + + memset(buf, 0x7C, sizeof(buf)); + ATF_REQUIRE_EQ(getrandom(buf, 255, 0), 255); + ATF_REQUIRE_EQ(memcmp(&buf[255], reference, sizeof(reference) - 255), 0); + + memset(buf, 0x7C, sizeof(buf)); + ATF_REQUIRE_EQ(getrandom(buf, 4095, 0), 4095); + ATF_REQUIRE_EQ(memcmp(&buf[4095], reference, sizeof(reference) - 4095), 0); +} + +ATF_TP_ADD_TCS(tp) +{ + + ATF_TP_ADD_TC(tp, getrandom_count); + ATF_TP_ADD_TC(tp, getrandom_fault); + ATF_TP_ADD_TC(tp, getrandom_randomness); + return (atf_no_error()); +} |