1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright (c) 2015, Joyent, Inc. 14 */ 15 16 /* 17 * Test getrandom(2) 18 */ 19 20 #include <sys/random.h> 21 #include <sys/mman.h> 22 #include <assert.h> 23 #include <errno.h> 24 25 int 26 main(void) 27 { 28 int ret; 29 void *addr; 30 uint8_t buf[32]; 31 uint8_t bigbuf[4096]; 32 33 /* Go through flags values, start with invalid */ 34 ret = getrandom(buf, sizeof (buf), 42); 35 assert(ret == -1); 36 assert(errno == EINVAL); 37 38 ret = getrandom(buf, sizeof (buf), 0); 39 assert(ret >= 0); 40 41 ret = getrandom(buf, sizeof (buf), GRND_NONBLOCK); 42 assert(ret >= 0); 43 44 ret = getrandom(buf, sizeof (buf), GRND_RANDOM); 45 assert(ret >= 0); 46 47 ret = getrandom(buf, sizeof (buf), GRND_RANDOM | GRND_NONBLOCK); 48 assert(ret >= 0); 49 50 ret = getrandom(buf, sizeof (buf), (GRND_RANDOM | GRND_NONBLOCK) << 1); 51 assert(ret == -1); 52 assert(errno == EINVAL); 53 54 /* Bad buffer addresses, eg. EFAULT */ 55 ret = getrandom(NULL, sizeof (buf), 0); 56 assert(ret == -1); 57 assert(errno == EFAULT); 58 59 ret = getrandom(NULL, sizeof (buf), GRND_RANDOM); 60 assert(ret == -1); 61 assert(errno == EFAULT); 62 63 /* Jump through a hoop to know we'll always have a bad address */ 64 addr = mmap(NULL, 4096, PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0); 65 assert(addr != MAP_FAILED); 66 ret = munmap(addr, 4096); 67 assert(ret == 0); 68 ret = getrandom(addr, sizeof (buf), 0); 69 assert(ret == -1); 70 assert(errno == EFAULT); 71 ret = getrandom(addr, sizeof (buf), GRND_RANDOM); 72 assert(ret == -1); 73 assert(errno == EFAULT); 74 75 /* Verify that we get rounded down on a getrandom of /dev/random */ 76 ret = getrandom(bigbuf, sizeof (buf), GRND_RANDOM); 77 assert(ret >= 0 && ret < sizeof (bigbuf)); 78 79 /* Do a few simple sets where we know we should get data */ 80 ret = getrandom(buf, sizeof (buf), 0); 81 assert(ret == sizeof (buf)); 82 ret = getrandom(buf, sizeof (buf), GRND_RANDOM); 83 assert(ret == sizeof (buf)); 84 85 return (0); 86 } 87