58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (c) 2017 Carlo Marcelo Arenas Belón <carenas@gmail.com>
|
|
*/
|
|
/*
|
|
* Very basic test for the RND* ioctls.
|
|
*
|
|
* Reads the entropy available from both /proc and the ioctl and compares
|
|
* they are similar enough (within a configured fuzz factor)
|
|
*
|
|
*/
|
|
|
|
#include <asm/types.h>
|
|
#include <linux/random.h>
|
|
#include <stdlib.h>
|
|
#include "tst_test.h"
|
|
|
|
static char *s_fuzz;
|
|
static int fuzz = 2;
|
|
static int fd;
|
|
|
|
static void verify_ioctl(void)
|
|
{
|
|
int cnt, pcnt;
|
|
|
|
SAFE_IOCTL(fd, RNDGETENTCNT, &cnt);
|
|
SAFE_FILE_SCANF("/proc/sys/kernel/random/entropy_avail", "%d", &pcnt);
|
|
tst_res(TINFO, "entropy value from ioctl: %d, proc: %d", cnt, pcnt);
|
|
|
|
if (abs(pcnt - cnt) <= fuzz)
|
|
tst_res(TPASS, "entropy value within expected parameters");
|
|
else
|
|
tst_res(TFAIL, "incorrect entropy value from ioctl");
|
|
}
|
|
|
|
static void setup(void)
|
|
{
|
|
fd = SAFE_OPEN("/dev/urandom", O_RDONLY);
|
|
if (s_fuzz)
|
|
fuzz = SAFE_STRTOL(s_fuzz, 0, 4096);
|
|
}
|
|
|
|
static void cleanup(void)
|
|
{
|
|
if (fd > 0)
|
|
SAFE_CLOSE(fd);
|
|
}
|
|
|
|
static struct tst_test test = {
|
|
.setup = setup,
|
|
.cleanup = cleanup,
|
|
.options = (struct tst_option[]) {
|
|
{"f:", &s_fuzz, "-f c Fuzz factor for valid match (default 2)"},
|
|
{}
|
|
},
|
|
.test_all = verify_ioctl,
|
|
};
|