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 #include <kern/kalloc.h>
92
93 /* Max panic string length */
94 #define kPanicStringMaxLen 1024
95
96 extern int psem_cache_purge_all(void);
97 extern int pshm_cache_purge_all(void);
98 extern int pshm_cache_purge_uid(uid_t uid);
99 extern void reset_osvariant_status(void);
100 extern void reset_osreleasetype(void);
101
102 int
reboot(struct proc * p,struct reboot_args * uap,__unused int32_t * retval)103 reboot(struct proc *p, struct reboot_args *uap, __unused int32_t *retval)
104 {
105 char *message = NULL;
106 int error = 0;
107 size_t dummy = 0;
108 #if CONFIG_MACF
109 kauth_cred_t my_cred;
110 #endif
111
112 AUDIT_ARG(cmd, uap->opt);
113
114 if ((error = suser(kauth_cred_get(), &p->p_acflag))) {
115 #if (DEVELOPMENT || DEBUG)
116 if (uap->opt & RB_PANIC) {
117 /* clear 'error' to allow non-root users to call panic on dev/debug kernels */
118 error = 0;
119 } else {
120 return error;
121 }
122 #else
123 return error;
124 #endif
125 }
126
127 if (uap->opt & RB_PANIC && uap->msg != USER_ADDR_NULL) {
128 message = (char *)kalloc_data(kPanicStringMaxLen, Z_WAITOK | Z_ZERO);
129 if (!message) {
130 return ENOMEM;
131 }
132 int copy_error = copyinstr(uap->msg, (void *)message, kPanicStringMaxLen, (size_t *)&dummy);
133 if (copy_error != 0 && copy_error != ENAMETOOLONG) {
134 strncpy(message, "user space RB_PANIC message copyin failed", kPanicStringMaxLen - 1);
135 } else {
136 message[kPanicStringMaxLen - 1] = '\0';
137 }
138 }
139
140 #if CONFIG_MACF
141 #if (DEVELOPMENT || DEBUG)
142 if (uap->opt & RB_PANIC) {
143 /* on dev/debug kernels: allow anyone to call panic */
144 goto skip_cred_check;
145 }
146 #endif
147
148 my_cred = kauth_cred_proc_ref(p);
149 error = mac_system_check_reboot(my_cred, uap->opt);
150 kauth_cred_unref(&my_cred);
151 #if (DEVELOPMENT || DEBUG)
152 skip_cred_check:
153 #endif
154 #endif
155 if (!error) {
156 OSBitOrAtomic(P_REBOOT, &p->p_flag); /* No more signals for this proc */
157 error = reboot_kernel(uap->opt, message);
158 }
159
160 kfree_data(message, kPanicStringMaxLen);
161 return error;
162 }
163
164 extern void OSKextResetAfterUserspaceReboot(void);
165 extern void zone_gc_drain(void);
166 extern uint64_t pmap_release_pages_fast(void);
167
168 static int
usrctl_full(void)169 usrctl_full(void)
170 {
171 reset_osvariant_status();
172 reset_osreleasetype();
173
174 #if CONFIG_ATM
175 atm_reset();
176 #endif
177
178 #if CONFIG_EXT_RESOLVER
179 /*
180 * We're doing a user space reboot. We are guaranteed that the
181 * external identity resolver is gone, so ensure that everything
182 * comes back up as with fresh-boot just in case it didn't go
183 * down cleanly.
184 */
185 kauth_resolver_identity_reset();
186 #endif /* CONFIG_EXT_RESOLVER */
187
188 OSKextResetAfterUserspaceReboot();
189 int shm_error = pshm_cache_purge_all();
190 int sem_error = psem_cache_purge_all();
191
192 zone_gc_drain();
193 pmap_release_pages_fast();
194
195 return shm_error != 0 ? shm_error : sem_error;
196 }
197
198 static int
usrctl_logout(uid_t uid)199 usrctl_logout(uid_t uid)
200 {
201 int shm_error = pshm_cache_purge_uid(uid);
202 /*
203 * Currently there is a requirement to purge some root-owned semaphores,
204 * and no use-case for preserving any. Just purge all of them.
205 */
206 int sem_error = psem_cache_purge_all();
207
208 /*
209 * Until rdar://78965143, kern.willuserspacereboot is set when logout begins
210 * so its effects need to be reset here, when logout completes.
211 */
212 OSKextResetAfterUserspaceReboot();
213
214 return shm_error != 0 ? shm_error : sem_error;
215 }
216
217 int
usrctl(struct proc * p,struct usrctl_args * uap,__unused int32_t * retval)218 usrctl(struct proc *p, struct usrctl_args *uap, __unused int32_t *retval)
219 {
220 if (p != initproc) {
221 return EPERM;
222 }
223
224 if (uap->flags == 0) {
225 return usrctl_full();
226 } else {
227 return usrctl_logout((uid_t)uap->flags);
228 }
229 }
230