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(void);
92 extern int pshm_cache_purge_all(void);
93 extern int pshm_cache_purge_uid(uid_t uid);
94 extern void reset_osvariant_status(void);
95 extern void reset_osreleasetype(void);
96
97 int
reboot(struct proc * p,struct reboot_args * uap,__unused int32_t * retval)98 reboot(struct proc *p, struct reboot_args *uap, __unused int32_t *retval)
99 {
100 char message[256];
101 int error = 0;
102 size_t dummy = 0;
103 #if CONFIG_MACF
104 kauth_cred_t my_cred;
105 #endif
106
107 AUDIT_ARG(cmd, uap->opt);
108
109 message[0] = '\0';
110
111 if ((error = suser(kauth_cred_get(), &p->p_acflag))) {
112 #if (DEVELOPMENT || DEBUG)
113 if (uap->opt & RB_PANIC) {
114 /* clear 'error' to allow non-root users to call panic on dev/debug kernels */
115 error = 0;
116 } else {
117 return error;
118 }
119 #else
120 return error;
121 #endif
122 }
123
124 if (uap->opt & RB_PANIC && uap->msg != USER_ADDR_NULL) {
125 int copy_error = copyinstr(uap->msg, (void *)message, sizeof(message), (size_t *)&dummy);
126 if (copy_error != 0 && copy_error != ENAMETOOLONG) {
127 strncpy(message, "user space RB_PANIC message copyin failed", sizeof(message) - 1);
128 } else {
129 message[sizeof(message) - 1] = '\0';
130 }
131 }
132
133 #if CONFIG_MACF
134 #if (DEVELOPMENT || DEBUG)
135 if (uap->opt & RB_PANIC) {
136 /* on dev/debug kernels: allow anyone to call panic */
137 goto skip_cred_check;
138 }
139 #endif
140 if (error) {
141 return error;
142 }
143 my_cred = kauth_cred_proc_ref(p);
144 error = mac_system_check_reboot(my_cred, uap->opt);
145 kauth_cred_unref(&my_cred);
146 #if (DEVELOPMENT || DEBUG)
147 skip_cred_check:
148 #endif
149 #endif
150 if (!error) {
151 OSBitOrAtomic(P_REBOOT, &p->p_flag); /* No more signals for this proc */
152 error = reboot_kernel(uap->opt, message);
153 }
154 return error;
155 }
156
157 extern void OSKextResetAfterUserspaceReboot(void);
158 extern void zone_gc_drain(void);
159 extern uint64_t pmap_release_pages_fast(void);
160
161 static int
usrctl_full(void)162 usrctl_full(void)
163 {
164 reset_osvariant_status();
165 reset_osreleasetype();
166
167 #if CONFIG_ATM
168 atm_reset();
169 #endif
170
171 #if CONFIG_EXT_RESOLVER
172 /*
173 * We're doing a user space reboot. We are guaranteed that the
174 * external identity resolver is gone, so ensure that everything
175 * comes back up as with fresh-boot just in case it didn't go
176 * down cleanly.
177 */
178 kauth_resolver_identity_reset();
179 #endif /* CONFIG_EXT_RESOLVER */
180
181 OSKextResetAfterUserspaceReboot();
182 int shm_error = pshm_cache_purge_all();
183 int sem_error = psem_cache_purge_all();
184
185 zone_gc_drain();
186 pmap_release_pages_fast();
187
188 return shm_error != 0 ? shm_error : sem_error;
189 }
190
191 static int
usrctl_logout(uid_t uid)192 usrctl_logout(uid_t uid)
193 {
194 int shm_error = pshm_cache_purge_uid(uid);
195 /*
196 * Currently there is a requirement to purge some root-owned semaphores,
197 * and no use-case for preserving any. Just purge all of them.
198 */
199 int sem_error = psem_cache_purge_all();
200
201 /*
202 * Until rdar://78965143, kern.willuserspacereboot is set when logout begins
203 * so its effects need to be reset here, when logout completes.
204 */
205 OSKextResetAfterUserspaceReboot();
206
207 return shm_error != 0 ? shm_error : sem_error;
208 }
209
210 int
usrctl(struct proc * p,struct usrctl_args * uap,__unused int32_t * retval)211 usrctl(struct proc *p, struct usrctl_args *uap, __unused int32_t *retval)
212 {
213 if (p != initproc) {
214 return EPERM;
215 }
216
217 if (uap->flags == 0) {
218 return usrctl_full();
219 } else {
220 return usrctl_logout((uid_t)uap->flags);
221 }
222 }
223