mac_label.c revision 165593
1122524Srwatson/*- 2136773Srwatson * Copyright (c) 2003-2004 Networks Associates Technology, Inc. 3122524Srwatson * All rights reserved. 4122524Srwatson * 5122524Srwatson * This software was developed for the FreeBSD Project in part by Network 6122524Srwatson * Associates Laboratories, the Security Research Division of Network 7122524Srwatson * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 8122524Srwatson * as part of the DARPA CHATS research program. 9122524Srwatson * 10122524Srwatson * Redistribution and use in source and binary forms, with or without 11122524Srwatson * modification, are permitted provided that the following conditions 12122524Srwatson * are met: 13122524Srwatson * 1. Redistributions of source code must retain the above copyright 14122524Srwatson * notice, this list of conditions and the following disclaimer. 15122524Srwatson * 2. Redistributions in binary form must reproduce the above copyright 16122524Srwatson * notice, this list of conditions and the following disclaimer in the 17122524Srwatson * documentation and/or other materials provided with the distribution. 18122524Srwatson * 19122524Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20122524Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21122524Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22122524Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23122524Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24122524Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25122524Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26122524Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27122524Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28122524Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29122524Srwatson * SUCH DAMAGE. 30122524Srwatson */ 31122524Srwatson 32122524Srwatson#include <sys/cdefs.h> 33122524Srwatson__FBSDID("$FreeBSD: head/sys/security/mac/mac_label.c 165593 2006-12-28 21:15:37Z rwatson $"); 34122524Srwatson 35122524Srwatson#include "opt_mac.h" 36122524Srwatson 37122524Srwatson#include <sys/param.h> 38122524Srwatson#include <sys/mac.h> 39122524Srwatson#include <sys/sysctl.h> 40122524Srwatson#include <sys/systm.h> 41122524Srwatson 42122524Srwatson#include <vm/uma.h> 43122524Srwatson 44163606Srwatson#include <security/mac/mac_framework.h> 45122524Srwatson#include <security/mac/mac_internal.h> 46122524Srwatson 47165422Srwatson/* 48165593Srwatson * zone_label is the UMA zone from which most labels are allocated. Label 49165422Srwatson * structures are initialized to zero bytes so that policies see a NULL/0 50165422Srwatson * slot on first use, even if the policy is loaded after the label is 51165422Srwatson * allocated for an object. 52165422Srwatson */ 53165422Srwatsonstatic uma_zone_t zone_label; 54122524Srwatson 55132987Sgreenstatic int mac_labelzone_ctor(void *mem, int size, void *arg, int flags); 56122524Srwatsonstatic void mac_labelzone_dtor(void *mem, int size, void *arg); 57122524Srwatson 58122524Srwatsonvoid 59122524Srwatsonmac_labelzone_init(void) 60122524Srwatson{ 61122524Srwatson 62122524Srwatson zone_label = uma_zcreate("MAC labels", sizeof(struct label), 63122524Srwatson mac_labelzone_ctor, mac_labelzone_dtor, NULL, NULL, 64122524Srwatson UMA_ALIGN_PTR, 0); 65122524Srwatson} 66122524Srwatson 67165593Srwatson/* 68165593Srwatson * mac_init_label() and mac_destroy_label() are exported so that they can be 69165593Srwatson * used in mbuf tag initialization, where labels are not slab allocated from 70165593Srwatson * the zone_label zone. 71165593Srwatson */ 72165593Srwatsonvoid 73165593Srwatsonmac_init_label(struct label *label) 74165593Srwatson{ 75165593Srwatson 76165593Srwatson bzero(label, sizeof(*label)); 77165593Srwatson label->l_flags = MAC_FLAG_INITIALIZED; 78165593Srwatson} 79165593Srwatson 80165593Srwatsonvoid 81165593Srwatsonmac_destroy_label(struct label *label) 82165593Srwatson{ 83165593Srwatson 84165593Srwatson KASSERT(label->l_flags & MAC_FLAG_INITIALIZED, 85165593Srwatson ("destroying uninitialized label")); 86165593Srwatson 87165593Srwatson#ifdef DIAGNOSTIC 88165593Srwatson bzero(label, sizeof(*label)); 89165593Srwatson#else 90165593Srwatson label->l_flags &= ~MAC_FLAG_INITIALIZED; 91165593Srwatson#endif 92165593Srwatson} 93165593Srwatson 94165593Srwatson 95132987Sgreenstatic int 96132987Sgreenmac_labelzone_ctor(void *mem, int size, void *arg, int flags) 97122524Srwatson{ 98122524Srwatson struct label *label; 99122524Srwatson 100122524Srwatson KASSERT(size == sizeof(*label), ("mac_labelzone_ctor: wrong size\n")); 101122524Srwatson label = mem; 102165593Srwatson mac_init_label(label); 103132987Sgreen return (0); 104122524Srwatson} 105122524Srwatson 106122524Srwatsonstatic void 107122524Srwatsonmac_labelzone_dtor(void *mem, int size, void *arg) 108122524Srwatson{ 109122524Srwatson struct label *label; 110122524Srwatson 111122524Srwatson KASSERT(size == sizeof(*label), ("mac_labelzone_dtor: wrong size\n")); 112122524Srwatson label = mem; 113165593Srwatson mac_destroy_label(label); 114122524Srwatson} 115122524Srwatson 116122524Srwatsonstruct label * 117122524Srwatsonmac_labelzone_alloc(int flags) 118122524Srwatson{ 119122524Srwatson 120122524Srwatson return (uma_zalloc(zone_label, flags)); 121122524Srwatson} 122122524Srwatson 123122524Srwatsonvoid 124122524Srwatsonmac_labelzone_free(struct label *label) 125122524Srwatson{ 126122524Srwatson 127122524Srwatson uma_zfree(zone_label, label); 128122524Srwatson} 129