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

     /*-
      * Copyright (c) 2004 Networks Associates Technology, Inc.
      * Copyright (c) 2005 SPARTA, Inc.
      * All rights reserved.
      *
      * This software was developed for the FreeBSD Project in part by Network
      * Associates Laboratories, the Security Research Division of Network
      * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
      * as part of the DARPA CHATS research program.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <kern/zalloc.h>
    #include <security/_label.h>
    #include <sys/param.h>
    #include <sys/queue.h>
    #include <sys/systm.h>
    #include <security/mac_internal.h>
    
    static zone_t zone_label;
    
    void
    mac_labelzone_init(void)
    {
    
            zone_label = zinit(sizeof(struct label),
                8192 * sizeof(struct label),
                sizeof(struct label), "MAC Labels");
            zone_change(zone_label, Z_EXPAND, TRUE);
            zone_change(zone_label, Z_EXHAUST, FALSE);
    }
    
    struct label *
    mac_labelzone_alloc(int flags)
    {
            struct label *l;
    
            if (flags & MAC_NOWAIT) 
                    l = (struct label *) zalloc_noblock(zone_label);
            else
                    l = (struct label *) zalloc(zone_label);
            if (l == NULL)
                    return (NULL);
    
            bzero(l, sizeof(struct label));
            l->l_flags = MAC_FLAG_INITIALIZED;
            return (l);
    }
    
    void
    mac_labelzone_free(struct label *l)
    {
    
            if (l == NULL)
                    panic("Free of NULL MAC label\n");
    
            if ((l->l_flags & MAC_FLAG_INITIALIZED) == 0)
                    panic("Free of uninitialized label\n");
            bzero(l, sizeof(struct label));
            zfree(zone_label, l);
    }
    
    /*
     * Functions used by policy modules to get and set label values.
     */
    intptr_t
    mac_label_get(struct label *l, int slot)
    {
            KASSERT(l != NULL, ("mac_label_get: NULL label"));
    
            return ((intptr_t) (l->l_perpolicy[slot].l_ptr));
    }
    
    void
    mac_label_set(struct label *l, int slot, intptr_t v)
    {
            KASSERT(l != NULL, ("mac_label_set: NULL label"));
    
            l->l_perpolicy[slot].l_ptr = (void *) v;
   }
   

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