1 /*- 2 * Copyright (c) 2003-2006 SPARTA, Inc. 3 * Copyright (c) 2009 Robert N. M. Watson 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project in part by Network 7 * Associates Laboratories, the Security Research Division of Network 8 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 9 * as part of the DARPA CHATS research program. 10 * 11 * This software was enhanced by SPARTA ISSO under SPAWAR contract 12 * N66001-04-C-6019 ("SEFOS"). * 13 * 14 * This software was developed at the University of Cambridge Computer 15 * Laboratory with support from a grant from Google, Inc. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include "opt_kdtrace.h" 43 #include "opt_mac.h" 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/mman.h> 48 #include <sys/malloc.h> 49 #include <sys/module.h> 50 #include <sys/sdt.h> 51 #include <sys/systm.h> 52 #include <sys/sysctl.h> 53 54 #include <security/mac/mac_framework.h> 55 #include <security/mac/mac_internal.h> 56 #include <security/mac/mac_policy.h> 57 58 static struct label * 59 mac_posixshm_label_alloc(void) 60 { 61 struct label *label; 62 63 label = mac_labelzone_alloc(M_WAITOK); 64 MAC_POLICY_PERFORM(posixshm_init_label, label); 65 return (label); 66 } 67 68 void 69 mac_posixshm_init(struct shmfd *shmfd) 70 { 71 72 if (mac_labeled & MPC_OBJECT_POSIXSHM) 73 shmfd->shm_label = mac_posixshm_label_alloc(); 74 else 75 shmfd->shm_label = NULL; 76 } 77 78 static void 79 mac_posixshm_label_free(struct label *label) 80 { 81 82 MAC_POLICY_PERFORM_NOSLEEP(posixshm_destroy_label, label); 83 mac_labelzone_free(label); 84 } 85 86 void 87 mac_posixshm_destroy(struct shmfd *shmfd) 88 { 89 90 if (shmfd->shm_label != NULL) { 91 mac_posixshm_label_free(shmfd->shm_label); 92 shmfd->shm_label = NULL; 93 } 94 } 95 96 void 97 mac_posixshm_create(struct ucred *cred, struct shmfd *shmfd) 98 { 99 100 MAC_POLICY_PERFORM_NOSLEEP(posixshm_create, cred, shmfd, 101 shmfd->shm_label); 102 } 103 104 MAC_CHECK_PROBE_DEFINE4(posixshm_check_mmap, "struct ucred *", 105 "struct shmfd *", "int", "int"); 106 107 int 108 mac_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, int prot, 109 int flags) 110 { 111 int error; 112 113 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_mmap, cred, shmfd, 114 shmfd->shm_label, prot, flags); 115 MAC_CHECK_PROBE4(posixshm_check_mmap, error, cred, shmfd, prot, 116 flags); 117 118 return (error); 119 } 120 121 MAC_CHECK_PROBE_DEFINE2(posixshm_check_open, "struct ucred *", 122 "struct shmfd *"); 123 124 int 125 mac_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd) 126 { 127 int error; 128 129 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_open, cred, shmfd, 130 shmfd->shm_label); 131 MAC_CHECK_PROBE2(posixshm_check_open, error, cred, shmfd); 132 133 return (error); 134 } 135 136 MAC_CHECK_PROBE_DEFINE3(posixshm_check_stat, "struct ucred *", 137 "struct ucred *", "struct shmfd *"); 138 139 int 140 mac_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred, 141 struct shmfd *shmfd) 142 { 143 int error; 144 145 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_stat, active_cred, file_cred, 146 shmfd, shmfd->shm_label); 147 MAC_CHECK_PROBE3(posixshm_check_stat, error, active_cred, file_cred, 148 shmfd); 149 150 return (error); 151 } 152 153 MAC_CHECK_PROBE_DEFINE3(posixshm_check_truncate, "struct ucred *", 154 "struct ucred *", "struct shmfd *"); 155 156 int 157 mac_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred, 158 struct shmfd *shmfd) 159 { 160 int error; 161 162 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_truncate, active_cred, 163 file_cred, shmfd, shmfd->shm_label); 164 MAC_CHECK_PROBE3(posixshm_check_truncate, error, active_cred, 165 file_cred, shmfd); 166 167 return (error); 168 } 169 170 MAC_CHECK_PROBE_DEFINE2(posixshm_check_unlink, "struct ucred *", 171 "struct shmfd *"); 172 173 int 174 mac_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd) 175 { 176 int error; 177 178 MAC_POLICY_CHECK_NOSLEEP(posixshm_check_unlink, cred, shmfd, 179 shmfd->shm_label); 180 MAC_CHECK_PROBE2(posixshm_check_unlink, error, cred, shmfd); 181 182 return (error); 183 } 184