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: releng/9.0/sys/compat/linux/linux_mib.c 219668 2011-03-15 13:40:47Z netchild $");
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/mount.h>
39 #include <sys/jail.h>
40 #include <sys/lock.h>
41 #include <sys/mutex.h>
42 #include <sys/sx.h>
43
44 #include "opt_compat.h"
45
46 #ifdef COMPAT_LINUX32
47 #include <machine/../linux32/linux.h>
48 #else
49 #include <machine/../linux/linux.h>
50 #endif
51 #include <compat/linux/linux_mib.h>
52
53 struct linux_prison {
54 char pr_osname[LINUX_MAX_UTSNAME];
55 char pr_osrelease[LINUX_MAX_UTSNAME];
56 int pr_oss_version;
57 int pr_osrel;
58 };
59
60 static struct linux_prison lprison0 = {
61 .pr_osname = "Linux",
62 .pr_osrelease = "2.6.16",
63 .pr_oss_version = 0x030600,
64 .pr_osrel = 2006016
65 };
66
67 static unsigned linux_osd_jail_slot;
68
69 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
70 "Linux mode");
71
72 static int linux_set_osname(struct thread *td, char *osname);
73 static int linux_set_osrelease(struct thread *td, char *osrelease);
74 static int linux_set_oss_version(struct thread *td, int oss_version);
75
76 static int
77 linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
78 {
79 char osname[LINUX_MAX_UTSNAME];
80 int error;
81
82 linux_get_osname(req->td, osname);
83 error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
84 if (error || req->newptr == NULL)
85 return (error);
86 error = linux_set_osname(req->td, osname);
87 return (error);
88 }
89
90 SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
91 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
92 0, 0, linux_sysctl_osname, "A",
93 "Linux kernel OS name");
94
95 static int
96 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
97 {
98 char osrelease[LINUX_MAX_UTSNAME];
99 int error;
100
101 linux_get_osrelease(req->td, osrelease);
102 error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
103 if (error || req->newptr == NULL)
104 return (error);
105 error = linux_set_osrelease(req->td, osrelease);
106 return (error);
107 }
108
109 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
110 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
111 0, 0, linux_sysctl_osrelease, "A",
112 "Linux kernel OS release");
113
114 static int
115 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
116 {
117 int oss_version;
118 int error;
119
120 oss_version = linux_get_oss_version(req->td);
121 error = sysctl_handle_int(oidp, &oss_version, 0, req);
122 if (error || req->newptr == NULL)
123 return (error);
124 error = linux_set_oss_version(req->td, oss_version);
125 return (error);
126 }
127
128 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
129 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
130 0, 0, linux_sysctl_oss_version, "I",
131 "Linux OSS version");
132
133 /*
134 * Map the osrelease into integer
135 */
136 static int
137 linux_map_osrel(char *osrelease, int *osrel)
138 {
139 char *sep, *eosrelease;
140 int len, v0, v1, v2, v;
141
142 len = strlen(osrelease);
143 eosrelease = osrelease + len;
144 v0 = strtol(osrelease, &sep, 10);
145 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
146 return (EINVAL);
147 osrelease = sep + 1;
148 v1 = strtol(osrelease, &sep, 10);
149 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
150 return (EINVAL);
151 osrelease = sep + 1;
152 v2 = strtol(osrelease, &sep, 10);
153 if (osrelease == sep || sep != eosrelease)
154 return (EINVAL);
155
156 v = v0 * 1000000 + v1 * 1000 + v2;
157 if (v < 1000000)
158 return (EINVAL);
159
160 *osrel = v;
161 return (0);
162 }
163
164 /*
165 * Find a prison with Linux info.
166 * Return the Linux info and the (locked) prison.
167 */
168 static struct linux_prison *
169 linux_find_prison(struct prison *spr, struct prison **prp)
170 {
171 struct prison *pr;
172 struct linux_prison *lpr;
173
174 if (!linux_osd_jail_slot)
175 /* In case osd_register failed. */
176 spr = &prison0;
177 for (pr = spr;; pr = pr->pr_parent) {
178 mtx_lock(&pr->pr_mtx);
179 lpr = (pr == &prison0)
180 ? &lprison0
181 : osd_jail_get(pr, linux_osd_jail_slot);
182 if (lpr != NULL)
183 break;
184 mtx_unlock(&pr->pr_mtx);
185 }
186 *prp = pr;
187 return (lpr);
188 }
189
190 /*
191 * Ensure a prison has its own Linux info. If lprp is non-null, point it to
192 * the Linux info and lock the prison.
193 */
194 static int
195 linux_alloc_prison(struct prison *pr, struct linux_prison **lprp)
196 {
197 struct prison *ppr;
198 struct linux_prison *lpr, *nlpr;
199 int error;
200
201 /* If this prison already has Linux info, return that. */
202 error = 0;
203 lpr = linux_find_prison(pr, &ppr);
204 if (ppr == pr)
205 goto done;
206 /*
207 * Allocate a new info record. Then check again, in case something
208 * changed during the allocation.
209 */
210 mtx_unlock(&ppr->pr_mtx);
211 nlpr = malloc(sizeof(struct linux_prison), M_PRISON, M_WAITOK);
212 lpr = linux_find_prison(pr, &ppr);
213 if (ppr == pr) {
214 free(nlpr, M_PRISON);
215 goto done;
216 }
217 /* Inherit the initial values from the ancestor. */
218 mtx_lock(&pr->pr_mtx);
219 error = osd_jail_set(pr, linux_osd_jail_slot, nlpr);
220 if (error == 0) {
221 bcopy(lpr, nlpr, sizeof(*lpr));
222 lpr = nlpr;
223 } else {
224 free(nlpr, M_PRISON);
225 lpr = NULL;
226 }
227 mtx_unlock(&ppr->pr_mtx);
228 done:
229 if (lprp != NULL)
230 *lprp = lpr;
231 else
232 mtx_unlock(&pr->pr_mtx);
233 return (error);
234 }
235
236 /*
237 * Jail OSD methods for Linux prison data.
238 */
239 static int
240 linux_prison_create(void *obj, void *data)
241 {
242 struct prison *pr = obj;
243 struct vfsoptlist *opts = data;
244 int jsys;
245
246 if (vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)) == 0 &&
247 jsys == JAIL_SYS_INHERIT)
248 return (0);
249 /*
250 * Inherit a prison's initial values from its parent
251 * (different from JAIL_SYS_INHERIT which also inherits changes).
252 */
253 return linux_alloc_prison(pr, NULL);
254 }
255
256 static int
257 linux_prison_check(void *obj __unused, void *data)
258 {
259 struct vfsoptlist *opts = data;
260 char *osname, *osrelease;
261 int error, jsys, len, osrel, oss_version;
262
263 /* Check that the parameters are correct. */
264 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
265 if (error != ENOENT) {
266 if (error != 0)
267 return (error);
268 if (jsys != JAIL_SYS_NEW && jsys != JAIL_SYS_INHERIT)
269 return (EINVAL);
270 }
271 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
272 if (error != ENOENT) {
273 if (error != 0)
274 return (error);
275 if (len == 0 || osname[len - 1] != '\0')
276 return (EINVAL);
277 if (len > LINUX_MAX_UTSNAME) {
278 vfs_opterror(opts, "linux.osname too long");
279 return (ENAMETOOLONG);
280 }
281 }
282 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
283 if (error != ENOENT) {
284 if (error != 0)
285 return (error);
286 if (len == 0 || osrelease[len - 1] != '\0')
287 return (EINVAL);
288 if (len > LINUX_MAX_UTSNAME) {
289 vfs_opterror(opts, "linux.osrelease too long");
290 return (ENAMETOOLONG);
291 }
292 error = linux_map_osrel(osrelease, &osrel);
293 if (error != 0) {
294 vfs_opterror(opts, "linux.osrelease format error");
295 return (error);
296 }
297 }
298 error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
299 sizeof(oss_version));
300 return (error == ENOENT ? 0 : error);
301 }
302
303 static int
304 linux_prison_set(void *obj, void *data)
305 {
306 struct linux_prison *lpr;
307 struct prison *pr = obj;
308 struct vfsoptlist *opts = data;
309 char *osname, *osrelease;
310 int error, gotversion, jsys, len, oss_version;
311
312 /* Set the parameters, which should be correct. */
313 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
314 if (error == ENOENT)
315 jsys = -1;
316 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
317 if (error == ENOENT)
318 osname = NULL;
319 else
320 jsys = JAIL_SYS_NEW;
321 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
322 if (error == ENOENT)
323 osrelease = NULL;
324 else
325 jsys = JAIL_SYS_NEW;
326 error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
327 sizeof(oss_version));
328 if (error == ENOENT)
329 gotversion = 0;
330 else {
331 gotversion = 1;
332 jsys = JAIL_SYS_NEW;
333 }
334 switch (jsys) {
335 case JAIL_SYS_INHERIT:
336 /* "linux=inherit": inherit the parent's Linux info. */
337 mtx_lock(&pr->pr_mtx);
338 osd_jail_del(pr, linux_osd_jail_slot);
339 mtx_unlock(&pr->pr_mtx);
340 break;
341 case JAIL_SYS_NEW:
342 /*
343 * "linux=new" or "linux.*":
344 * the prison gets its own Linux info.
345 */
346 error = linux_alloc_prison(pr, &lpr);
347 if (error) {
348 mtx_unlock(&pr->pr_mtx);
349 return (error);
350 }
351 if (osrelease) {
352 error = linux_map_osrel(osrelease, &lpr->pr_osrel);
353 if (error) {
354 mtx_unlock(&pr->pr_mtx);
355 return (error);
356 }
357 strlcpy(lpr->pr_osrelease, osrelease,
358 LINUX_MAX_UTSNAME);
359 }
360 if (osname)
361 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
362 if (gotversion)
363 lpr->pr_oss_version = oss_version;
364 mtx_unlock(&pr->pr_mtx);
365 }
366 return (0);
367 }
368
369 SYSCTL_JAIL_PARAM_SYS_NODE(linux, CTLFLAG_RW, "Jail Linux parameters");
370 SYSCTL_JAIL_PARAM_STRING(_linux, osname, CTLFLAG_RW, LINUX_MAX_UTSNAME,
371 "Jail Linux kernel OS name");
372 SYSCTL_JAIL_PARAM_STRING(_linux, osrelease, CTLFLAG_RW, LINUX_MAX_UTSNAME,
373 "Jail Linux kernel OS release");
374 SYSCTL_JAIL_PARAM(_linux, oss_version, CTLTYPE_INT | CTLFLAG_RW,
375 "I", "Jail Linux OSS version");
376
377 static int
378 linux_prison_get(void *obj, void *data)
379 {
380 struct linux_prison *lpr;
381 struct prison *ppr;
382 struct prison *pr = obj;
383 struct vfsoptlist *opts = data;
384 int error, i;
385
386 static int version0;
387
388 /* See if this prison is the one with the Linux info. */
389 lpr = linux_find_prison(pr, &ppr);
390 i = (ppr == pr) ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
391 error = vfs_setopt(opts, "linux", &i, sizeof(i));
392 if (error != 0 && error != ENOENT)
393 goto done;
394 if (i) {
395 error = vfs_setopts(opts, "linux.osname", lpr->pr_osname);
396 if (error != 0 && error != ENOENT)
397 goto done;
398 error = vfs_setopts(opts, "linux.osrelease", lpr->pr_osrelease);
399 if (error != 0 && error != ENOENT)
400 goto done;
401 error = vfs_setopt(opts, "linux.oss_version",
402 &lpr->pr_oss_version, sizeof(lpr->pr_oss_version));
403 if (error != 0 && error != ENOENT)
404 goto done;
405 } else {
406 /*
407 * If this prison is inheriting its Linux info, report
408 * empty/zero parameters.
409 */
410 error = vfs_setopts(opts, "linux.osname", "");
411 if (error != 0 && error != ENOENT)
412 goto done;
413 error = vfs_setopts(opts, "linux.osrelease", "");
414 if (error != 0 && error != ENOENT)
415 goto done;
416 error = vfs_setopt(opts, "linux.oss_version", &version0,
417 sizeof(lpr->pr_oss_version));
418 if (error != 0 && error != ENOENT)
419 goto done;
420 }
421 error = 0;
422
423 done:
424 mtx_unlock(&ppr->pr_mtx);
425 return (error);
426 }
427
428 static void
429 linux_prison_destructor(void *data)
430 {
431
432 free(data, M_PRISON);
433 }
434
435 void
436 linux_osd_jail_register(void)
437 {
438 struct prison *pr;
439 osd_method_t methods[PR_MAXMETHOD] = {
440 [PR_METHOD_CREATE] = linux_prison_create,
441 [PR_METHOD_GET] = linux_prison_get,
442 [PR_METHOD_SET] = linux_prison_set,
443 [PR_METHOD_CHECK] = linux_prison_check
444 };
445
446 linux_osd_jail_slot =
447 osd_jail_register(linux_prison_destructor, methods);
448 if (linux_osd_jail_slot > 0) {
449 /* Copy the system linux info to any current prisons. */
450 sx_xlock(&allprison_lock);
451 TAILQ_FOREACH(pr, &allprison, pr_list)
452 (void)linux_alloc_prison(pr, NULL);
453 sx_xunlock(&allprison_lock);
454 }
455 }
456
457 void
458 linux_osd_jail_deregister(void)
459 {
460
461 if (linux_osd_jail_slot)
462 osd_jail_deregister(linux_osd_jail_slot);
463 }
464
465 void
466 linux_get_osname(struct thread *td, char *dst)
467 {
468 struct prison *pr;
469 struct linux_prison *lpr;
470
471 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
472 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
473 mtx_unlock(&pr->pr_mtx);
474 }
475
476 static int
477 linux_set_osname(struct thread *td, char *osname)
478 {
479 struct prison *pr;
480 struct linux_prison *lpr;
481
482 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
483 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
484 mtx_unlock(&pr->pr_mtx);
485 return (0);
486 }
487
488 void
489 linux_get_osrelease(struct thread *td, char *dst)
490 {
491 struct prison *pr;
492 struct linux_prison *lpr;
493
494 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
495 bcopy(lpr->pr_osrelease, dst, LINUX_MAX_UTSNAME);
496 mtx_unlock(&pr->pr_mtx);
497 }
498
499 int
500 linux_kernver(struct thread *td)
501 {
502 struct prison *pr;
503 struct linux_prison *lpr;
504 int osrel;
505
506 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
507 osrel = lpr->pr_osrel;
508 mtx_unlock(&pr->pr_mtx);
509 return (osrel);
510 }
511
512 static int
513 linux_set_osrelease(struct thread *td, char *osrelease)
514 {
515 struct prison *pr;
516 struct linux_prison *lpr;
517 int error;
518
519 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
520 error = linux_map_osrel(osrelease, &lpr->pr_osrel);
521 if (error == 0)
522 strlcpy(lpr->pr_osrelease, osrelease, LINUX_MAX_UTSNAME);
523 mtx_unlock(&pr->pr_mtx);
524 return (error);
525 }
526
527 int
528 linux_get_oss_version(struct thread *td)
529 {
530 struct prison *pr;
531 struct linux_prison *lpr;
532 int version;
533
534 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
535 version = lpr->pr_oss_version;
536 mtx_unlock(&pr->pr_mtx);
537 return (version);
538 }
539
540 static int
541 linux_set_oss_version(struct thread *td, int oss_version)
542 {
543 struct prison *pr;
544 struct linux_prison *lpr;
545
546 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
547 lpr->pr_oss_version = oss_version;
548 mtx_unlock(&pr->pr_mtx);
549 return (0);
550 }
551
552 #if defined(DEBUG) || defined(KTR)
553
554 u_char linux_debug_map[howmany(LINUX_SYS_MAXSYSCALL, sizeof(u_char))];
555
556 static int
557 linux_debug(int syscall, int toggle, int global)
558 {
559
560 if (global) {
561 char c = toggle ? 0 : 0xff;
562
563 memset(linux_debug_map, c, sizeof(linux_debug_map));
564 return (0);
565 }
566 if (syscall < 0 || syscall >= LINUX_SYS_MAXSYSCALL)
567 return (EINVAL);
568 if (toggle)
569 clrbit(linux_debug_map, syscall);
570 else
571 setbit(linux_debug_map, syscall);
572 return (0);
573 }
574
575 /*
576 * Usage: sysctl linux.debug=<syscall_nr>.<0/1>
577 *
578 * E.g.: sysctl linux.debug=21.0
579 *
580 * As a special case, syscall "all" will apply to all syscalls globally.
581 */
582 #define LINUX_MAX_DEBUGSTR 16
583 static int
584 linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
585 {
586 char value[LINUX_MAX_DEBUGSTR], *p;
587 int error, sysc, toggle;
588 int global = 0;
589
590 value[0] = '\0';
591 error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
592 if (error || req->newptr == NULL)
593 return (error);
594 for (p = value; *p != '\0' && *p != '.'; p++);
595 if (*p == '\0')
596 return (EINVAL);
597 *p++ = '\0';
598 sysc = strtol(value, NULL, 0);
599 toggle = strtol(p, NULL, 0);
600 if (strcmp(value, "all") == 0)
601 global = 1;
602 error = linux_debug(sysc, toggle, global);
603 return (error);
604 }
605
606 SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
607 CTLTYPE_STRING | CTLFLAG_RW,
608 0, 0, linux_sysctl_debug, "A",
609 "Linux debugging control");
610
611 #endif /* DEBUG || KTR */
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