usr/src/cmd/dtrace/test/tst/common/safety/tst.copyin2.d

   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 }