freebsd-dev/tests/sys/kern/sys_getrandom.c
Conrad Meyer 855c2cbe07 Appease GCC 4.2
It mistakenly believes the 'static' keyword must come first.  Fix PPC,
Sparc64, and maybe MIPS world.  Fallout from r331279.

Reported by:	tinderbox (results come slowly)
2018-03-21 04:44:19 +00:00

131 lines
4.0 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#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());
}