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
47 int
main(int argc,char ** argv)48 main(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