1 /*
2 * Copyright (C) 2015 Cedric Hnyda ced.hnyda@gmail.com
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 */
20
21 /*
22 * AUTHOR : Cédric Hnyda
23 * DATE STARTED : 06/13/2015
24 *
25 * Calls getrandom(2), checks that the buffer is filled with random bytes
26 * and expects success.
27 *
28 */
29
30 #include "lapi/getrandom.h"
31 #include "linux_syscall_numbers.h"
32 #include "test.h"
33
34 char *TCID = "getrandom02";
35 static int modes[] = { 0, GRND_RANDOM, GRND_NONBLOCK,
36 GRND_RANDOM | GRND_NONBLOCK };
37
38 int TST_TOTAL = ARRAY_SIZE(modes);
39
40 static unsigned char buf[256];
41 static size_t size = 256;
42
43 static void fill(void);
44 static int check_content(int nb);
45
main(int ac,char ** av)46 int main(int ac, char **av)
47 {
48 int lc, i;
49
50 tst_parse_opts(ac, av, NULL, NULL);
51
52 for (lc = 0; TEST_LOOPING(lc); lc++) {
53 tst_count = 0;
54
55 for (i = 0; i < TST_TOTAL; i++) {
56 fill();
57
58 do {
59 TEST(ltp_syscall(__NR_getrandom, buf, size,
60 modes[i]));
61 } while ((modes[i] & GRND_NONBLOCK) && TEST_RETURN == -1
62 && TEST_ERRNO == EAGAIN);
63
64 if (!check_content(TEST_RETURN))
65 tst_resm(TFAIL | TTERRNO, "getrandom failed");
66 else
67 tst_resm(TPASS, "getrandom returned %ld",
68 TEST_RETURN);
69 }
70 }
71 tst_exit();
72 }
73
fill(void)74 static void fill(void)
75 {
76 memset(buf, '\0', sizeof(buf));
77 }
78
check_content(int nb)79 static int check_content(int nb)
80 {
81 int table[256];
82 int i, index, max;
83
84 memset(table, 0, sizeof(table));
85
86 max = nb * 0.10;
87
88 for (i = 0; i < nb; i++) {
89 index = buf[i];
90 table[index]++;
91 }
92
93 for (i = 0; i < nb; i++) {
94 if (max > 0 && table[i] > max)
95 return 0;
96 }
97 return 1;
98 }
99