1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2023 The FreeBSD Foundation
5 *
6 * This software was developed by Mark Johnston under sponsorship from
7 * the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are
11 * met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in
16 *    the documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31/*
32 * Idea from a test case by Andrew "RhodiumToad" Gierth in Bugzilla PR 271766.
33 */
34
35#include <sys/param.h>
36#include <sys/disk.h>
37#include <sys/mman.h>
38
39#include <crypto/cryptodev.h>
40
41#include <err.h>
42#include <fcntl.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46
47int
48main(int argc, char **argv)
49{
50	const char *disk;
51	char *buf1, *buf2;
52	off_t disksz;
53	size_t bufsz, iosz;
54	ssize_t n;
55	unsigned int offsets, secsz;
56	int fd;
57
58	if (argc != 2)
59		errx(1, "Usage: %s <disk>", argv[0]);
60	disk = argv[1];
61
62	fd = open(disk, O_RDWR);
63	if (fd < 0)
64		err(1, "open(%s)", disk);
65
66	if (ioctl(fd, DIOCGSECTORSIZE, &secsz) != 0)
67		err(1, "ioctl(DIOCGSECTORSIZE)");
68	if (secsz == 0)
69		errx(1, "ioctl(DIOCGSECTORSIZE) returned 0");
70	if (ioctl(fd, DIOCGMEDIASIZE, &disksz) != 0)
71		err(1, "ioctl(DIOCGMEDIASIZE)");
72	if (disksz / secsz < 2)
73		errx(1, "disk needs to be at least 2 sectors in size");
74	iosz = 2 * secsz;
75
76	bufsz = iosz + secsz;
77	buf1 = mmap(NULL, bufsz, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
78	    -1, 0);
79	if (buf1 == MAP_FAILED)
80		err(1, "mmap");
81	buf2 = mmap(NULL, bufsz, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
82	    -1, 0);
83	if (buf2 == MAP_FAILED)
84		err(1, "mmap");
85
86	arc4random_buf(buf1, bufsz);
87	n = pwrite(fd, buf1, bufsz, 0);
88	if (n < 0 || (size_t)n != bufsz)
89		err(1, "pwrite");
90
91	/*
92	 * Limit the number of offsets we test with, to avoid spending too much
93	 * time when the sector size is large.
94	 */
95	offsets = MAX(EALG_MAX_BLOCK_LEN, HMAC_MAX_BLOCK_LEN) + 1;
96
97	/*
98	 * Read test: read the first 2 sectors into buf1, then do the same with
99	 * buf2, except at varying offsets into buf2.  After each read, compare
100	 * the buffers and make sure they're identical.  This exercises corner
101	 * cases in the crypto layer's buffer handling.
102	 */
103	n = pread(fd, buf1, iosz, 0);
104	if (n < 0 || (size_t)n != iosz)
105		err(1, "pread");
106	for (unsigned int i = 0; i < offsets; i++) {
107		n = pread(fd, buf2 + i, iosz, 0);
108		if (n < 0 || (size_t)n != iosz)
109			err(1, "pread");
110		if (memcmp(buf1, buf2 + i, iosz) != 0)
111			errx(1, "read mismatch at offset %u/%u", i, secsz);
112	}
113
114	/*
115	 * Write test.  Try writing buffers at various alignments, and verify
116	 * that we read back what we wrote.
117	 */
118	arc4random_buf(buf1, bufsz);
119	for (unsigned int i = 0; i < offsets; i++) {
120		n = pwrite(fd, buf1 + i, iosz, 0);
121		if (n < 0 || (size_t)n != iosz)
122			err(1, "pwrite");
123		n = pread(fd, buf2, iosz, 0);
124		if (n < 0 || (size_t)n != iosz)
125			err(1, "pread");
126		if (memcmp(buf1 + i, buf2, iosz) != 0)
127			errx(1, "write mismatch at offset %u/%u", i, secsz);
128	}
129
130	return (0);
131}
132