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 #include "opt_mac.h" 42 43 #include <sys/param.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/malloc.h> 47 #include <sys/mutex.h> 48 #include <sys/sbuf.h> 49 #include <sys/systm.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/file.h> 53 #include <sys/namei.h> 54 #include <sys/sdt.h> 55 #include <sys/sysctl.h> 56 #include <sys/shm.h> 57 58 #include <security/mac/mac_framework.h> 59 #include <security/mac/mac_internal.h> 60 #include <security/mac/mac_policy.h> 61 62 static struct label * 63 mac_sysv_shm_label_alloc(void) 64 { 65 struct label *label; 66 67 label = mac_labelzone_alloc(M_WAITOK); 68 MAC_POLICY_PERFORM(sysvshm_init_label, label); 69 return (label); 70 } 71 72 void 73 mac_sysvshm_init(struct shmid_kernel *shmsegptr) 74 { 75 76 if (mac_labeled & MPC_OBJECT_SYSVSHM) 77 shmsegptr->label = mac_sysv_shm_label_alloc(); 78 else 79 shmsegptr->label = NULL; 80 } 81 82 static void 83 mac_sysv_shm_label_free(struct label *label) 84 { 85 86 MAC_POLICY_PERFORM_NOSLEEP(sysvshm_destroy_label, label); 87 mac_labelzone_free(label); 88 } 89 90 void 91 mac_sysvshm_destroy(struct shmid_kernel *shmsegptr) 92 { 93 94 if (shmsegptr->label != NULL) { 95 mac_sysv_shm_label_free(shmsegptr->label); 96 shmsegptr->label = NULL; 97 } 98 } 99 100 void 101 mac_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr) 102 { 103 104 MAC_POLICY_PERFORM_NOSLEEP(sysvshm_create, cred, shmsegptr, 105 shmsegptr->label); 106 } 107 108 void 109 mac_sysvshm_cleanup(struct shmid_kernel *shmsegptr) 110 { 111 112 MAC_POLICY_PERFORM_NOSLEEP(sysvshm_cleanup, shmsegptr->label); 113 } 114 115 MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmat, "struct ucred *", 116 "struct shmid_kernel *", "int"); 117 118 int 119 mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, 120 int shmflg) 121 { 122 int error; 123 124 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmat, cred, shmsegptr, 125 shmsegptr->label, shmflg); 126 MAC_CHECK_PROBE3(sysvshm_check_shmat, error, cred, shmsegptr, 127 shmflg); 128 129 return (error); 130 } 131 132 MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmctl, "struct ucred *", 133 "struct shmid_kernel *", "int"); 134 135 int 136 mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, 137 int cmd) 138 { 139 int error; 140 141 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmctl, cred, shmsegptr, 142 shmsegptr->label, cmd); 143 MAC_CHECK_PROBE3(sysvshm_check_shmctl, error, cred, shmsegptr, cmd); 144 145 return (error); 146 } 147 148 MAC_CHECK_PROBE_DEFINE2(sysvshm_check_shmdt, "struct ucred *", 149 "struct shmid *"); 150 151 int 152 mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr) 153 { 154 int error; 155 156 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmdt, cred, shmsegptr, 157 shmsegptr->label); 158 MAC_CHECK_PROBE2(sysvshm_check_shmdt, error, cred, shmsegptr); 159 160 return (error); 161 } 162 163 MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmget, "struct ucred *", 164 "struct shmid_kernel *", "int"); 165 166 int 167 mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, 168 int shmflg) 169 { 170 int error; 171 172 MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmget, cred, shmsegptr, 173 shmsegptr->label, shmflg); 174 MAC_CHECK_PROBE3(sysvshm_check_shmget, error, cred, shmsegptr, 175 shmflg); 176 177 return (error); 178 } 179