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/sem.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_sem_label_alloc(void) 64 { 65 struct label *label; 66 67 label = mac_labelzone_alloc(M_WAITOK); 68 MAC_POLICY_PERFORM(sysvsem_init_label, label); 69 return (label); 70 } 71 72 void 73 mac_sysvsem_init(struct semid_kernel *semakptr) 74 { 75 76 if (mac_labeled & MPC_OBJECT_SYSVSEM) 77 semakptr->label = mac_sysv_sem_label_alloc(); 78 else 79 semakptr->label = NULL; 80 } 81 82 static void 83 mac_sysv_sem_label_free(struct label *label) 84 { 85 86 MAC_POLICY_PERFORM_NOSLEEP(sysvsem_destroy_label, label); 87 mac_labelzone_free(label); 88 } 89 90 void 91 mac_sysvsem_destroy(struct semid_kernel *semakptr) 92 { 93 94 if (semakptr->label != NULL) { 95 mac_sysv_sem_label_free(semakptr->label); 96 semakptr->label = NULL; 97 } 98 } 99 100 void 101 mac_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr) 102 { 103 104 MAC_POLICY_PERFORM_NOSLEEP(sysvsem_create, cred, semakptr, 105 semakptr->label); 106 } 107 108 void 109 mac_sysvsem_cleanup(struct semid_kernel *semakptr) 110 { 111 112 MAC_POLICY_PERFORM_NOSLEEP(sysvsem_cleanup, semakptr->label); 113 } 114 115 MAC_CHECK_PROBE_DEFINE3(sysvsem_check_semctl, "struct ucred *", 116 "struct semid_kernel *", "int"); 117 118 int 119 mac_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, 120 int cmd) 121 { 122 int error; 123 124 MAC_POLICY_CHECK_NOSLEEP(sysvsem_check_semctl, cred, semakptr, 125 semakptr->label, cmd); 126 MAC_CHECK_PROBE3(sysvsem_check_semctl, error, cred, semakptr, cmd); 127 128 return (error); 129 } 130 131 MAC_CHECK_PROBE_DEFINE2(sysvsem_check_semget, "struct ucred *", 132 "struct semid_kernel *"); 133 134 int 135 mac_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr) 136 { 137 int error; 138 139 MAC_POLICY_CHECK_NOSLEEP(sysvsem_check_semget, cred, semakptr, 140 semakptr->label); 141 142 return (error); 143 } 144 145 MAC_CHECK_PROBE_DEFINE3(sysvsem_check_semop, "struct ucred *", 146 "struct semid_kernel *", "size_t"); 147 148 int 149 mac_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, 150 size_t accesstype) 151 { 152 int error; 153 154 MAC_POLICY_CHECK_NOSLEEP(sysvsem_check_semop, cred, semakptr, 155 semakptr->label, accesstype); 156 MAC_CHECK_PROBE3(sysvsem_check_semop, error, cred, semakptr, 157 accesstype); 158 159 return (error); 160 } 161