xref: /freebsd/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/safety/tst.copyin2.d (revision 2be1a816b9ff69588e55be0a84cbe2a31efc0f2f)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 /*
30  * Test that there is no value of 'size' which can be passed to copyin
31  * to cause mischief.  The somewhat odd order of operations ensures
32  * that we test both size = 0 and size = 0xfff...fff
33  */
34 #include <sys/types.h>
35 
36 
37 #if defined(_LP64)
38 #define MAX_BITS 63
39 size_t size;
40 #else
41 #define MAX_BITS 31
42 size_t size;
43 #endif
44 
45 syscall:::
46 /pid == $pid/
47 {
48 	printf("size = 0x%lx\n", (ulong_t)size);
49 }
50 
51 syscall:::
52 /pid == $pid/
53 {
54 	tracemem(copyin(curthread->t_procp->p_user.u_envp, size), 10);
55 }
56 
57 syscall:::
58 /pid == $pid && size > (1 << MAX_BITS)/
59 {
60 	exit(0);
61 }
62 
63 syscall:::
64 /pid == $pid/
65 {
66 	size = (size << 1ULL) | 1ULL;
67 }
68