1 /*-
2 * Copyright (c) 1999 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/systm.h>
35 #include <sys/sysctl.h>
36 #include <sys/proc.h>
37 #include <sys/malloc.h>
38 #include <sys/jail.h>
39 #include <sys/lock.h>
40 #include <sys/mutex.h>
41
42 #include "opt_compat.h"
43
44 #ifdef COMPAT_LINUX32
45 #include <machine/../linux32/linux.h>
46 #else
47 #include <machine/../linux/linux.h>
48 #endif
49 #include <compat/linux/linux_mib.h>
50
51 struct linux_prison {
52 char pr_osname[LINUX_MAX_UTSNAME];
53 char pr_osrelease[LINUX_MAX_UTSNAME];
54 int pr_oss_version;
55 int pr_use_linux26; /* flag to determine whether to use 2.6 emulation */
56 };
57
58 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
59 "Linux mode");
60
61 static struct mtx osname_lock;
62 MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);
63
64 static char linux_osname[LINUX_MAX_UTSNAME] = "Linux";
65
66 static int
67 linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
68 {
69 char osname[LINUX_MAX_UTSNAME];
70 int error;
71
72 linux_get_osname(req->td, osname);
73 error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
74 if (error || req->newptr == NULL)
75 return (error);
76 error = linux_set_osname(req->td, osname);
77 return (error);
78 }
79
80 SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
81 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
82 0, 0, linux_sysctl_osname, "A",
83 "Linux kernel OS name");
84
85 static char linux_osrelease[LINUX_MAX_UTSNAME] = "2.4.2";
86 static int linux_use_linux26 = 0;
87
88 static int
89 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
90 {
91 char osrelease[LINUX_MAX_UTSNAME];
92 int error;
93
94 linux_get_osrelease(req->td, osrelease);
95 error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
96 if (error || req->newptr == NULL)
97 return (error);
98 error = linux_set_osrelease(req->td, osrelease);
99 return (error);
100 }
101
102 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
103 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
104 0, 0, linux_sysctl_osrelease, "A",
105 "Linux kernel OS release");
106
107 static int linux_oss_version = 0x030600;
108
109 static int
110 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
111 {
112 int oss_version;
113 int error;
114
115 oss_version = linux_get_oss_version(req->td);
116 error = sysctl_handle_int(oidp, &oss_version, 0, req);
117 if (error || req->newptr == NULL)
118 return (error);
119 error = linux_set_oss_version(req->td, oss_version);
120 return (error);
121 }
122
123 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
124 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON,
125 0, 0, linux_sysctl_oss_version, "I",
126 "Linux OSS version");
127
128 /*
129 * Returns holding the prison mutex if return non-NULL.
130 */
131 static struct prison *
132 linux_get_prison(struct thread *td)
133 {
134 register struct prison *pr;
135 register struct linux_prison *lpr;
136
137 KASSERT(td == curthread, ("linux_get_prison() called on !curthread"));
138 if (!jailed(td->td_ucred))
139 return (NULL);
140 pr = td->td_ucred->cr_prison;
141 mtx_lock(&pr->pr_mtx);
142 if (pr->pr_linux == NULL) {
143 /*
144 * If we don't have a linux prison structure yet, allocate
145 * one. We have to handle the race where another thread
146 * could be adding a linux prison to this process already.
147 */
148 mtx_unlock(&pr->pr_mtx);
149 lpr = malloc(sizeof(struct linux_prison), M_PRISON,
150 M_WAITOK | M_ZERO);
151 mtx_lock(&pr->pr_mtx);
152 if (pr->pr_linux == NULL)
153 pr->pr_linux = lpr;
154 else
155 free(lpr, M_PRISON);
156 }
157 return (pr);
158 }
159
160 void
161 linux_get_osname(struct thread *td, char *dst)
162 {
163 register struct prison *pr;
164 register struct linux_prison *lpr;
165
166 pr = td->td_ucred->cr_prison;
167 if (pr != NULL) {
168 mtx_lock(&pr->pr_mtx);
169 if (pr->pr_linux != NULL) {
170 lpr = (struct linux_prison *)pr->pr_linux;
171 if (lpr->pr_osname[0]) {
172 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
173 mtx_unlock(&pr->pr_mtx);
174 return;
175 }
176 }
177 mtx_unlock(&pr->pr_mtx);
178 }
179
180 mtx_lock(&osname_lock);
181 bcopy(linux_osname, dst, LINUX_MAX_UTSNAME);
182 mtx_unlock(&osname_lock);
183 }
184
185 int
186 linux_set_osname(struct thread *td, char *osname)
187 {
188 struct prison *pr;
189 struct linux_prison *lpr;
190
191 pr = linux_get_prison(td);
192 if (pr != NULL) {
193 lpr = (struct linux_prison *)pr->pr_linux;
194 strcpy(lpr->pr_osname, osname);
195 mtx_unlock(&pr->pr_mtx);
196 } else {
197 mtx_lock(&osname_lock);
198 strcpy(linux_osname, osname);
199 mtx_unlock(&osname_lock);
200 }
201
202 return (0);
203 }
204
205 void
206 linux_get_osrelease(struct thread *td, char *dst)
207 {
208 register struct prison *pr;
209 struct linux_prison *lpr;
210
211 pr = td->td_ucred->cr_prison;
212 if (pr != NULL) {
213 mtx_lock(&pr->pr_mtx);
214 if (pr->pr_linux != NULL) {
215 lpr = (struct linux_prison *)pr->pr_linux;
216 if (lpr->pr_osrelease[0]) {
217 bcopy(lpr->pr_osrelease, dst,
218 LINUX_MAX_UTSNAME);
219 mtx_unlock(&pr->pr_mtx);
220 return;
221 }
222 }
223 mtx_unlock(&pr->pr_mtx);
224 }
225
226 mtx_lock(&osname_lock);
227 bcopy(linux_osrelease, dst, LINUX_MAX_UTSNAME);
228 mtx_unlock(&osname_lock);
229 }
230
231 int
232 linux_use26(struct thread *td)
233 {
234 struct prison *pr;
235 struct linux_prison *lpr;
236 int use26 = linux_use_linux26;
237
238 pr = td->td_ucred->cr_prison;
239 if (pr != NULL) {
240 if (pr->pr_linux != NULL) {
241 lpr = (struct linux_prison *)pr->pr_linux;
242 use26 = lpr->pr_use_linux26;
243 }
244 }
245
246 return (use26);
247 }
248
249 int
250 linux_set_osrelease(struct thread *td, char *osrelease)
251 {
252 struct prison *pr;
253 struct linux_prison *lpr;
254 int use26;
255
256 use26 = (strlen(osrelease) >= 3 && osrelease[2] == '6');
257
258 pr = linux_get_prison(td);
259 if (pr != NULL) {
260 lpr = (struct linux_prison *)pr->pr_linux;
261 strcpy(lpr->pr_osrelease, osrelease);
262 lpr->pr_use_linux26 = use26;
263 mtx_unlock(&pr->pr_mtx);
264 } else {
265 mtx_lock(&osname_lock);
266 strcpy(linux_osrelease, osrelease);
267 linux_use_linux26 = use26;
268 mtx_unlock(&osname_lock);
269 }
270
271 return (0);
272 }
273
274 int
275 linux_get_oss_version(struct thread *td)
276 {
277 register struct prison *pr;
278 register struct linux_prison *lpr;
279 int version;
280
281 pr = td->td_ucred->cr_prison;
282 if (pr != NULL) {
283 mtx_lock(&pr->pr_mtx);
284 if (pr->pr_linux != NULL) {
285 lpr = (struct linux_prison *)pr->pr_linux;
286 if (lpr->pr_oss_version) {
287 version = lpr->pr_oss_version;
288 mtx_unlock(&pr->pr_mtx);
289 return (version);
290 }
291 }
292 mtx_unlock(&pr->pr_mtx);
293 }
294
295 mtx_lock(&osname_lock);
296 version = linux_oss_version;
297 mtx_unlock(&osname_lock);
298 return (version);
299 }
300
301 int
302 linux_set_oss_version(struct thread *td, int oss_version)
303 {
304 struct prison *pr;
305 struct linux_prison *lpr;
306
307 pr = linux_get_prison(td);
308 if (pr != NULL) {
309 lpr = (struct linux_prison *)pr->pr_linux;
310 lpr->pr_oss_version = oss_version;
311 mtx_unlock(&pr->pr_mtx);
312 } else {
313 mtx_lock(&osname_lock);
314 linux_oss_version = oss_version;
315 mtx_unlock(&osname_lock);
316 }
317
318 return (0);
319 }
320
321 #ifdef DEBUG
322
323 u_char linux_debug_map[howmany(LINUX_SYS_MAXSYSCALL, sizeof(u_char))];
324
325 static int
326 linux_debug(int syscall, int toggle, int global)
327 {
328
329 if (global) {
330 char c = toggle ? 0 : 0xff;
331
332 memset(linux_debug_map, c, sizeof(linux_debug_map));
333 return (0);
334 }
335 if (syscall < 0 || syscall >= LINUX_SYS_MAXSYSCALL)
336 return (EINVAL);
337 if (toggle)
338 clrbit(linux_debug_map, syscall);
339 else
340 setbit(linux_debug_map, syscall);
341 return (0);
342 }
343
344 /*
345 * Usage: sysctl linux.debug=<syscall_nr>.<0/1>
346 *
347 * E.g.: sysctl linux.debug=21.0
348 *
349 * As a special case, syscall "all" will apply to all syscalls globally.
350 */
351 #define LINUX_MAX_DEBUGSTR 16
352 static int
353 linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
354 {
355 char value[LINUX_MAX_DEBUGSTR], *p;
356 int error, sysc, toggle;
357 int global = 0;
358
359 value[0] = '\0';
360 error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
361 if (error || req->newptr == NULL)
362 return (error);
363 for (p = value; *p != '\0' && *p != '.'; p++);
364 if (*p == '\0')
365 return (EINVAL);
366 *p++ = '\0';
367 sysc = strtol(value, NULL, 0);
368 toggle = strtol(p, NULL, 0);
369 if (strcmp(value, "all") == 0)
370 global = 1;
371 error = linux_debug(sysc, toggle, global);
372 return (error);
373 }
374
375 SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
376 CTLTYPE_STRING | CTLFLAG_RW,
377 0, 0, linux_sysctl_debug, "A",
378 "Linux debugging control");
379
380 #endif /* DEBUG */
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