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 #include <kern/ext_paniclog.h>
93
94 #include <IOKit/IOBSD.h>
95
96 /* Max panic string length */
97 #define kPanicStringMaxLen 1024
98
99 extern int psem_cache_purge_all(void);
100 extern int pshm_cache_purge_all(void);
101 extern int pshm_cache_purge_uid(uid_t uid);
102 extern void reset_osvariant_status(void);
103 extern void reset_osreleasetype(void);
104
105 int
reboot(struct proc * p,struct reboot_args * uap,__unused int32_t * retval)106 reboot(struct proc *p, struct reboot_args *uap, __unused int32_t *retval)
107 {
108 char *message = NULL;
109 int error = 0;
110 size_t dummy = 0;
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 error = mac_system_check_reboot(current_cached_proc_cred(p), uap->opt);
149 #if (DEVELOPMENT || DEBUG)
150 skip_cred_check:
151 #endif
152 #endif
153 if (!error) {
154 OSBitOrAtomic(P_REBOOT, &p->p_flag); /* No more signals for this proc */
155 error = reboot_kernel(uap->opt, message);
156 }
157
158 kfree_data(message, kPanicStringMaxLen);
159 return error;
160 }
161
162 int
sys_panic_with_data(struct proc * p,struct panic_with_data_args * uap,__unused int32_t * retval)163 sys_panic_with_data(struct proc *p,
164 struct panic_with_data_args *uap,
165 __unused int32_t *retval)
166 {
167 char *message = NULL;
168 void *data = NULL;
169 int copy_len = 0;
170 size_t dummy = 0;
171 uuid_t uuid = {0};
172
173 AUDIT_ARG(addr, uap->addr);
174 AUDIT_ARG(value32, uap->len);
175 AUDIT_ARG(addr, uap->uuid);
176
177 if (!IOCurrentTaskHasEntitlement(EXTPANICLOG_ENTITLEMENT)) {
178 return EPERM;
179 }
180
181 char *proc_name = proc_best_name(p);
182
183 if (uap->msg != USER_ADDR_NULL) {
184 message = (char *)kalloc_data(kPanicStringMaxLen, Z_WAITOK | Z_ZERO);
185 if (!message) {
186 goto finish;
187 }
188 int copy_error = copyinstr(uap->msg, (void *)message, kPanicStringMaxLen, (size_t *)&dummy);
189 if (copy_error != 0 && copy_error != ENAMETOOLONG) {
190 strlcpy(message, "user space panic_with_data message copyin failed", kPanicStringMaxLen - 1);
191 } else {
192 message[kPanicStringMaxLen - 1] = '\0';
193 }
194 }
195
196 if (uap->addr != USER_ADDR_NULL) {
197 copy_len = MIN(uap->len, PANIC_WITH_DATA_MAX_LEN);
198
199 data = kalloc_data(copy_len, Z_WAITOK | Z_ZERO);
200 if (!data) {
201 goto finish;
202 }
203
204 int copy_error = copyin(uap->addr, data, copy_len);
205 if (copy_error != 0) {
206 kfree_data(data, copy_len);
207 data = NULL;
208 }
209 }
210
211 if (uap->uuid != USER_ADDR_NULL) {
212 int copyerror = copyin(uap->uuid, &uuid[0], sizeof(uuid_t));
213 if (copyerror != 0) {
214 goto finish;
215 }
216 }
217
218 finish:
219 panic_with_data(uuid, data, copy_len,
220 "Panic called from Process: %s Message: %s", proc_name, message);
221 }
222
223 extern void OSKextResetAfterUserspaceReboot(void);
224 extern void zone_gc_drain(void);
225 extern uint64_t pmap_release_pages_fast(void);
226
227 static int
usrctl_full(void)228 usrctl_full(void)
229 {
230 reset_osvariant_status();
231 reset_osreleasetype();
232
233 #if CONFIG_ATM
234 atm_reset();
235 #endif
236
237 #if CONFIG_EXT_RESOLVER
238 /*
239 * We're doing a user space reboot. We are guaranteed that the
240 * external identity resolver is gone, so ensure that everything
241 * comes back up as with fresh-boot just in case it didn't go
242 * down cleanly.
243 */
244 kauth_resolver_identity_reset();
245 #endif /* CONFIG_EXT_RESOLVER */
246
247 OSKextResetAfterUserspaceReboot();
248 int shm_error = pshm_cache_purge_all();
249 int sem_error = psem_cache_purge_all();
250
251 zone_gc_drain();
252 pmap_release_pages_fast();
253
254 return shm_error != 0 ? shm_error : sem_error;
255 }
256
257 static int
usrctl_logout(uid_t uid)258 usrctl_logout(uid_t uid)
259 {
260 int shm_error = pshm_cache_purge_uid(uid);
261 /*
262 * Currently there is a requirement to purge some root-owned semaphores,
263 * and no use-case for preserving any. Just purge all of them.
264 */
265 int sem_error = psem_cache_purge_all();
266
267 /*
268 * Until rdar://78965143, kern.willuserspacereboot is set when logout begins
269 * so its effects need to be reset here, when logout completes.
270 */
271 OSKextResetAfterUserspaceReboot();
272
273 return shm_error != 0 ? shm_error : sem_error;
274 }
275
276 int
usrctl(struct proc * p,struct usrctl_args * uap,__unused int32_t * retval)277 usrctl(struct proc *p, struct usrctl_args *uap, __unused int32_t *retval)
278 {
279 if (p != initproc) {
280 return EPERM;
281 }
282
283 if (uap->flags == 0) {
284 return usrctl_full();
285 } else {
286 return usrctl_logout((uid_t)uap->flags);
287 }
288 }
289