bsd/kern/kern_xxx.c

   1 /*
   2  * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  29 /*
  30  * Copyright (c) 1982, 1986, 1989, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. All advertising materials mentioning features or use of this software
  42  *    must display the following acknowledgement:
  43  *      This product includes software developed by the University of
  44  *      California, Berkeley and its contributors.
  45  * 4. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)kern_xxx.c  8.2 (Berkeley) 11/14/93
  62  */
  63 /*
  64  * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
  65  * support for mandatory and extensible security protections.  This notice
  66  * is included in support of clause 2.2 (b) of the Apple Public License,
  67  * Version 2.0.
  68  */
  69
  70 #include <sys/param.h>
  71 #include <sys/systm.h>
  72 #include <sys/kernel.h>
  73 #include <sys/proc_internal.h>
  74 #include <sys/kauth.h>
  75 #include <sys/reboot.h>
  76 #include <sys/vm.h>
  77 #include <sys/sysctl.h>
  78 #include <sys/buf.h>
  79
  80 #include <security/audit/audit.h>
  81
  82 #include <sys/mount_internal.h>
  83 #include <sys/sysproto.h>
  84 #if CONFIG_MACF
  85 #include <security/mac_framework.h>
  86 #endif
  87 #if CONFIG_ATM
  88 #include <atm/atm_internal.h>
  89 #endif
  90
  91 extern int psem_cache_purge_all(proc_t p);
  92 extern int pshm_cache_purge_all(proc_t p);
  93 extern void reset_osvariant_status(void);
  94 extern void reset_osreleasetype(void);
  95
  96 int
  97 reboot(struct proc *p, struct reboot_args *uap, __unused int32_t *retval)
  98 {
  99         char message[256];
 100         int error = 0;
 101         size_t dummy = 0;
 102 #if CONFIG_MACF
 103         kauth_cred_t my_cred;
 104 #endif
 105
 106         AUDIT_ARG(cmd, uap->opt);
 107
 108         message[0] = '\0';
 109
 110         if ((error = suser(kauth_cred_get(), &p->p_acflag))) {
 111 #if (DEVELOPMENT || DEBUG)
 112                 if (uap->opt & RB_PANIC) {
 113                         /* clear 'error' to allow non-root users to call panic on dev/debug kernels */
 114                         error = 0;
 115                 } else {
 116                         return error;
 117                 }
 118 #else
 119                 return error;
 120 #endif
 121         }
 122
 123         if (uap->opt & RB_PANIC && uap->msg != USER_ADDR_NULL) {
 124                 int copy_error = copyinstr(uap->msg, (void *)message, sizeof(message), (size_t *)&dummy);
 125                 if (copy_error != 0 && copy_error != ENAMETOOLONG) {
 126                         strncpy(message, "user space RB_PANIC message copyin failed", sizeof(message) - 1);
 127                 } else {
 128                         message[sizeof(message) - 1] = '\0';
 129                 }
 130         }
 131
 132 #if CONFIG_MACF
 133 #if (DEVELOPMENT || DEBUG)
 134         if (uap->opt & RB_PANIC) {
 135                 /* on dev/debug kernels: allow anyone to call panic */
 136                 goto skip_cred_check;
 137         }
 138 #endif
 139         if (error) {
 140                 return error;
 141         }
 142         my_cred = kauth_cred_proc_ref(p);
 143         error = mac_system_check_reboot(my_cred, uap->opt);
 144         kauth_cred_unref(&my_cred);
 145 #if (DEVELOPMENT || DEBUG)
 146 skip_cred_check:
 147 #endif
 148 #endif
 149         if (!error) {
 150                 OSBitOrAtomic(P_REBOOT, &p->p_flag);  /* No more signals for this proc */
 151                 error = reboot_kernel(uap->opt, message);
 152         }
 153         return error;
 154 }
 155
 156 extern void OSKextResetAfterUserspaceReboot(void);
 157 extern void zone_gc(boolean_t);
 158
 159 int
 160 usrctl(struct proc *p, __unused struct usrctl_args *uap, __unused int32_t *retval)
 161 {
 162         if (p != initproc) {
 163                 return EPERM;
 164         }
 165
 166         reset_osvariant_status();
 167         reset_osreleasetype();
 168
 169 #if CONFIG_ATM
 170         atm_reset();
 171 #endif
 172
 173 #if CONFIG_EXT_RESOLVER
 174         /*
 175          * We're doing a user space reboot.  We are guaranteed that the
 176          * external identity resolver is gone, so ensure that everything
 177          * comes back up as with fresh-boot just in case it didn't go
 178          * down cleanly.
 179          */
 180         kauth_resolver_identity_reset();
 181 #endif /* CONFIG_EXT_RESOLVER */
 182
 183         OSKextResetAfterUserspaceReboot();
 184         int shm_error = pshm_cache_purge_all(p);
 185         int sem_error = psem_cache_purge_all(p);
 186
 187         zone_gc(FALSE);
 188
 189         return shm_error != 0 ? shm_error : sem_error;
 190 }