1 /*-
2  * Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  */
27 
28 /* Test lockf(3) with overlapping ranges */
29 
30 /* Provoked:
31 	lock order reversal:
32 	 1st 0xc50057a0 vnode interlock (vnode interlock) @ kern/kern_lockf.c:190
33 	 2nd 0xc14710e8 system map (system map) @ vm/vm_kern.c:296
34  */
35 
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <unistd.h>
39 #include <fcntl.h>
40 #include <sys/types.h>
41 #include <sys/param.h>
42 #include <strings.h>
43 #include <errno.h>
44 #include <err.h>
45 
46 #include <stress.h>
47 
48 char file[128];
49 int fd;
50 
51 int
52 setup(int nb)
53 {
54 	int i;
55 	char buf[1024];
56 
57 	sprintf(file, "lockf.%d", getpid());
58 	if ((fd = open(file,O_CREAT | O_TRUNC | O_RDWR, 0600)) == -1)
59 		err(1, "creat(%s)", file);
60 	bzero(buf, sizeof(buf));
61 	for (i = 0; i < 1024; i++)
62 		if (write(fd, &buf, sizeof(buf)) != sizeof(buf))
63 			err(1, "write");
64 	close(fd);
65         return (0);
66 }
67 
68 void
69 cleanup(void)
70 {
71 	unlink(file);
72 }
73 
74 int
75 test(void)
76 {
77 	int i;
78 	off_t pos;
79 	off_t size;
80 
81 	if ((fd = open(file, O_RDWR, 0600)) == -1)
82 		err(1, "open(%s)", file);
83 
84 	for (i = 0; i < 1024; i++) {
85 		pos = random_int(0, 1024 * 1024 - 1);
86 		if (lseek(fd, pos, SEEK_SET) == -1)
87 			err(1, "lseek");
88 		size = random_int(1, 1024 * 1024 - pos);
89 		if (size > 64)
90 			size = 64;
91 		if (lockf(fd, F_LOCK, size) == -1)
92 			err(1, "lockf(%s, F_LOCK)", file);
93 		size = random_int(1, size);
94 		if (lockf(fd, F_ULOCK, size) == -1)
95 			err(1, "lockf(%s, F_ULOCK)", file);
96 
97 	}
98 	close(fd);
99 
100         return (0);
101 }
102