1 /*- 2 * Copyright (c) 2003-2004 Networks Associates Technology, Inc. 3 * Copyright (c) 2006 SPARTA, Inc. 4 * Copyright (c) 2009 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * This software was developed for the FreeBSD Project in part by Network 8 * Associates Laboratories, the Security Research Division of Network 9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 10 * as part of the DARPA CHATS research program. 11 * 12 * This software was enhanced by SPARTA ISSO under SPAWAR contract 13 * N66001-04-C-6019 ("SEFOS"). 14 * 15 * This software was developed at the University of Cambridge Computer 16 * Laboratory with support from a grant from Google, Inc. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_mac.h" 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mutex.h> 50 #include <sys/sbuf.h> 51 #include <sys/systm.h> 52 #include <sys/vnode.h> 53 #include <sys/mount.h> 54 #include <sys/file.h> 55 #include <sys/namei.h> 56 #include <sys/sdt.h> 57 #include <sys/sysctl.h> 58 #include <sys/shm.h> 59 60 #include <security/mac/mac_framework.h> 61 #include <security/mac/mac_internal.h> 62 #include <security/mac/mac_policy.h> 63 64 static struct label * 65 mac_sysv_shm_label_alloc(void) 66 { 67 struct label *label; 68 69 label = mac_labelzone_alloc(M_WAITOK); 70 MAC_POLICY_PERFORM(sysvshm_init_label, label); 71 return (label); 72 } 73 74 void 75 mac_sysvshm_init(struct shmid_kernel *shmsegptr) 76 { 77 78 if (mac_labeled & MPC_OBJECT_SYSVSHM) 79 shmsegptr->label = mac_sysv_shm_label_alloc(); 80 else 81 shmsegptr->label = NULL; 82 } 83 84 static void 85 mac_sysv_shm_label_free(struct label *label) 86 { 87 88 MAC_POLICY_PERFORM_NOSLEEP(sysvshm_destroy_label, label); 89 mac_labelzone_free(label); 90 } 91 92 void 93 mac_sysvshm_destroy(struct shmid_kernel *shmsegptr) 94 { 95 96 if (shmsegptr->label != NULL) { 97 mac_sysv_shm_label_free(shmsegptr->label); 98 shmsegptr->label = NULL; 99 } 100 } 101 102 void 103 mac_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr) 104 { 105 106 MAC_POLICY_PERFORM_NOSLEEP(sysvshm_create, cred, shmsegptr, 107 shmsegptr->label); 108 } 109 110 void 111 mac_sysvshm_cleanup(struct shmid_kernel *shmsegptr) 112 { 113 114 MAC_POLICY_PERFORM_NOSLEEP(sysvshm_cleanup, shmsegptr->label); 115 } 116 117 MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmat, "struct ucred *", 118 "struct shmid_kernel *", "int"); 119 120 int 121 mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 122 int shmflg) 123 { 124 int error; 125 126 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmat, cred, shmsegptr, 127 shmsegptr->label, shmflg); 128 MAC_CHECK_PROBE3(sysvshm_check_shmat, error, cred, shmsegptr, 129 shmflg); 130 131 return (error); 132 } 133 134 MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmctl, "struct ucred *", 135 "struct shmid_kernel *", "int"); 136 137 int 138 mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 139 int cmd) 140 { 141 int error; 142 143 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmctl, cred, shmsegptr, 144 shmsegptr->label, cmd); 145 MAC_CHECK_PROBE3(sysvshm_check_shmctl, error, cred, shmsegptr, cmd); 146 147 return (error); 148 } 149 150 MAC_CHECK_PROBE_DEFINE2(sysvshm_check_shmdt, "struct ucred *", 151 "struct shmid *"); 152 153 int 154 mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr) 155 { 156 int error; 157 158 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmdt, cred, shmsegptr, 159 shmsegptr->label); 160 MAC_CHECK_PROBE2(sysvshm_check_shmdt, error, cred, shmsegptr); 161 162 return (error); 163 } 164 165 MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmget, "struct ucred *", 166 "struct shmid_kernel *", "int"); 167 168 int 169 mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 170 int shmflg) 171 { 172 int error; 173 174 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmget, cred, shmsegptr, 175 shmsegptr->label, shmflg); 176 MAC_CHECK_PROBE3(sysvshm_check_shmget, error, cred, shmsegptr, 177 shmflg); 178 179 return (error); 180 } 181