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