The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/security/mac_posix_sem.c

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    1 /*
    2  * Copyright (c) 2007 Apple Inc. All rights reserved.
    3  *
    4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
    5  * 
    6  * This file contains Original Code and/or Modifications of Original Code
    7  * as defined in and that are subject to the Apple Public Source License
    8  * Version 2.0 (the 'License'). You may not use this file except in
    9  * compliance with the License. The rights granted to you under the License
   10  * may not be used to create, or enable the creation or redistribution of,
   11  * unlawful or unlicensed copies of an Apple operating system, or to
   12  * circumvent, violate, or enable the circumvention or violation of, any
   13  * terms of an Apple operating system software license agreement.
   14  * 
   15  * Please obtain a copy of the License at
   16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
   17  * 
   18  * The Original Code and all software distributed under the License are
   19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   23  * Please see the License for the specific language governing rights and
   24  * limitations under the License.
   25  * 
   26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
   27  */
   28 /*-
   29  * Copyright (c) 2003-2005 Networks Associates Technology, Inc.
   30  * All rights reserved.
   31  *
   32  * This software was developed for the FreeBSD Project in part by Network
   33  * Associates Laboratories, the Security Research Division of Network
   34  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
   35  * as part of the DARPA CHATS research program.
   36  *
   37  * Redistribution and use in source and binary forms, with or without
   38  * modification, are permitted provided that the following conditions
   39  * are met:
   40  * 1. Redistributions of source code must retain the above copyright
   41  *    notice, this list of conditions and the following disclaimer.
   42  * 2. Redistributions in binary form must reproduce the above copyright
   43  *    notice, this list of conditions and the following disclaimer in the
   44  *    documentation and/or other materials provided with the distribution.
   45  *
   46  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   56  * SUCH DAMAGE.
   57  */
   58 
   59 #include <sys/cdefs.h>
   60 
   61 #include <sys/param.h>
   62 #include <sys/kernel.h>
   63 #include <sys/lock.h>
   64 #include <sys/malloc.h>
   65 #include <sys/sbuf.h>
   66 #include <sys/systm.h>
   67 #include <sys/sysctl.h>
   68 #include <security/mac_internal.h>
   69 #include <sys/posix_sem.h>
   70 
   71 
   72 static struct label *
   73 mac_posixsem_label_alloc(void)
   74 {
   75         struct label *label;
   76 
   77         label = mac_labelzone_alloc(MAC_WAITOK);
   78         if (label == NULL)
   79                 return (NULL);
   80         MAC_PERFORM(posixsem_label_init, label);
   81         return (label);
   82 }
   83 
   84 void
   85 mac_posixsem_label_init(struct pseminfo *psem)
   86 {
   87 
   88         psem->psem_label = mac_posixsem_label_alloc();
   89 }
   90 
   91 static void
   92 mac_posixsem_label_free(struct label *label)
   93 {
   94 
   95         MAC_PERFORM(posixsem_label_destroy, label);
   96         mac_labelzone_free(label);
   97 }
   98 
   99 void
  100 mac_posixsem_label_destroy(struct pseminfo *psem)
  101 {
  102 
  103         mac_posixsem_label_free(psem->psem_label);
  104         psem->psem_label = NULL;
  105 }
  106 
  107 void
  108 mac_posixsem_label_associate(kauth_cred_t cred, struct pseminfo *psem,
  109     const char *name)
  110 {
  111 
  112         MAC_PERFORM(posixsem_label_associate, cred, psem, psem->psem_label, name);
  113 }
  114 
  115 
  116 void
  117 mac_posixsem_vnode_label_associate(kauth_cred_t cred, 
  118         struct pseminfo *psem,  struct label *plabel,
  119         vnode_t vp, struct label *vlabel)
  120 {
  121         MAC_PERFORM(vnode_label_associate_posixsem, cred,
  122                     psem, plabel, vp, vlabel);
  123 }
  124 
  125 int
  126 mac_posixsem_check_create(kauth_cred_t cred, const char *name)
  127 {
  128         int error;
  129 
  130         if (!mac_posixsem_enforce)
  131                 return (0);
  132 
  133         MAC_CHECK(posixsem_check_create, cred, name);
  134 
  135         return (error);
  136 }
  137 
  138 int
  139 mac_posixsem_check_open(kauth_cred_t cred, struct pseminfo *psem)
  140 {
  141         int error;
  142 
  143         if (!mac_posixsem_enforce)
  144                 return (0);
  145 
  146         MAC_CHECK(posixsem_check_open, cred, psem,
  147             psem->psem_label);
  148 
  149         return (error);
  150 }
  151 
  152 int
  153 mac_posixsem_check_post(kauth_cred_t cred, struct pseminfo *psem)
  154 {
  155         int error;
  156 
  157         if (!mac_posixsem_enforce)
  158                 return (0);
  159 
  160         MAC_CHECK(posixsem_check_post, cred, psem, psem->psem_label);
  161 
  162         return (error);
  163 }
  164 
  165 int
  166 mac_posixsem_check_unlink(kauth_cred_t cred, struct pseminfo *psem,
  167     const char *name)
  168 {
  169         int error;
  170 
  171         if (!mac_posixsem_enforce)
  172                 return (0);
  173 
  174         MAC_CHECK(posixsem_check_unlink, cred, psem, psem->psem_label, name);
  175 
  176         return (error);
  177 }
  178 
  179 int
  180 mac_posixsem_check_wait(kauth_cred_t cred, struct pseminfo *psem)
  181 {
  182         int error;
  183 
  184         if (!mac_posixsem_enforce)
  185                 return (0);
  186 
  187         MAC_CHECK(posixsem_check_wait, cred, psem, psem->psem_label);
  188 
  189         return (error);
  190 }

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