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/mac_label.c

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    1 /*-
    2  * Copyright (c) 2003-2004 Networks Associates Technology, Inc.
    3  * All rights reserved.
    4  *
    5  * This software was developed for the FreeBSD Project in part by Network
    6  * Associates Laboratories, the Security Research Division of Network
    7  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
    8  * as part of the DARPA CHATS research program.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/6.2/sys/security/mac/mac_label.c 136773 2004-10-22 11:08:52Z rwatson $");
   34 
   35 #include "opt_mac.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/mac.h>
   39 #include <sys/sysctl.h>
   40 #include <sys/systm.h>
   41 
   42 #include <vm/uma.h>
   43 
   44 #include <security/mac/mac_internal.h>
   45 
   46 uma_zone_t      zone_label;
   47 
   48 static int      mac_labelzone_ctor(void *mem, int size, void *arg, int flags);
   49 static void     mac_labelzone_dtor(void *mem, int size, void *arg);
   50 
   51 void
   52 mac_labelzone_init(void)
   53 {
   54 
   55         zone_label = uma_zcreate("MAC labels", sizeof(struct label),
   56             mac_labelzone_ctor, mac_labelzone_dtor, NULL, NULL,
   57             UMA_ALIGN_PTR, 0);
   58 }
   59 
   60 static int
   61 mac_labelzone_ctor(void *mem, int size, void *arg, int flags)
   62 {
   63         struct label *label;
   64 
   65         KASSERT(size == sizeof(*label), ("mac_labelzone_ctor: wrong size\n"));
   66         label = mem;
   67         bzero(label, sizeof(*label));
   68         label->l_flags = MAC_FLAG_INITIALIZED;
   69         return (0);
   70 }
   71 
   72 static void
   73 mac_labelzone_dtor(void *mem, int size, void *arg)
   74 {
   75         struct label *label;
   76 
   77         KASSERT(size == sizeof(*label), ("mac_labelzone_dtor: wrong size\n"));
   78         label = mem;
   79         KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
   80             ("mac_labelzone_dtor: label not initialized"));
   81 #ifdef DIAGNOSTIC
   82         bzero(label, sizeof(*label));
   83 #else
   84         label->l_flags &= ~MAC_FLAG_INITIALIZED;
   85 #endif
   86 }
   87 
   88 struct label *
   89 mac_labelzone_alloc(int flags)
   90 {
   91 
   92         return (uma_zalloc(zone_label, flags));
   93 }
   94 
   95 void
   96 mac_labelzone_free(struct label *label)
   97 {
   98 
   99         uma_zfree(zone_label, label);
  100 }

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