152 lines
4.0 KiB
C
152 lines
4.0 KiB
C
/*-
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* Copyright (c) 2003-2004 Networks Associates Technology, Inc.
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* Copyright (c) 2007 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project in part by Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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* as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <vm/uma.h>
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#include <security/mac/mac_framework.h>
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#include <security/mac/mac_internal.h>
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#include <security/mac/mac_policy.h>
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/*
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* zone_label is the UMA zone from which most labels are allocated. Label
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* structures are initialized to zero bytes so that policies see a NULL/0
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* slot on first use, even if the policy is loaded after the label is
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* allocated for an object.
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*/
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static uma_zone_t zone_label;
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static int mac_labelzone_ctor(void *mem, int size, void *arg, int flags);
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static void mac_labelzone_dtor(void *mem, int size, void *arg);
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void
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mac_labelzone_init(void)
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{
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zone_label = uma_zcreate("MAC labels", sizeof(struct label),
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mac_labelzone_ctor, mac_labelzone_dtor, NULL, NULL,
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UMA_ALIGN_PTR, 0);
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}
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/*
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* mac_init_label() and mac_destroy_label() are exported so that they can be
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* used in mbuf tag initialization, where labels are not slab allocated from
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* the zone_label zone.
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*/
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void
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mac_init_label(struct label *label)
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{
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bzero(label, sizeof(*label));
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label->l_flags = MAC_FLAG_INITIALIZED;
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}
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void
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mac_destroy_label(struct label *label)
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{
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KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
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("destroying uninitialized label"));
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#ifdef DIAGNOSTIC
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bzero(label, sizeof(*label));
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#else
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label->l_flags &= ~MAC_FLAG_INITIALIZED;
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#endif
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}
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static int
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mac_labelzone_ctor(void *mem, int size, void *arg, int flags)
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{
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struct label *label;
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KASSERT(size == sizeof(*label), ("mac_labelzone_ctor: wrong size\n"));
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label = mem;
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mac_init_label(label);
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return (0);
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}
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static void
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mac_labelzone_dtor(void *mem, int size, void *arg)
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{
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struct label *label;
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KASSERT(size == sizeof(*label), ("mac_labelzone_dtor: wrong size\n"));
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label = mem;
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mac_destroy_label(label);
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}
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struct label *
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mac_labelzone_alloc(int flags)
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{
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return (uma_zalloc(zone_label, flags));
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}
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void
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mac_labelzone_free(struct label *label)
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{
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uma_zfree(zone_label, label);
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}
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/*
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* Functions used by policy modules to get and set label values.
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*/
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intptr_t
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mac_label_get(struct label *l, int slot)
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{
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KASSERT(l != NULL, ("mac_label_get: NULL label"));
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return (l->l_perpolicy[slot]);
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}
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void
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mac_label_set(struct label *l, int slot, intptr_t v)
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{
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KASSERT(l != NULL, ("mac_label_set: NULL label"));
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l->l_perpolicy[slot] = v;
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}
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