FreeBSD kernel kern code
kern_jail.c
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1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1999 Poul-Henning Kamp.
5 * Copyright (c) 2008 Bjoern A. Zeeb.
6 * Copyright (c) 2009 James Gritton.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD$");
33
34#include "opt_ddb.h"
35#include "opt_inet.h"
36#include "opt_inet6.h"
37
38#include <sys/param.h>
39#include <sys/types.h>
40#include <sys/kernel.h>
41#include <sys/systm.h>
42#include <sys/errno.h>
43#include <sys/sysproto.h>
44#include <sys/malloc.h>
45#include <sys/osd.h>
46#include <sys/priv.h>
47#include <sys/proc.h>
48#include <sys/epoch.h>
49#include <sys/taskqueue.h>
50#include <sys/fcntl.h>
51#include <sys/jail.h>
52#include <sys/linker.h>
53#include <sys/lock.h>
54#include <sys/mutex.h>
55#include <sys/racct.h>
56#include <sys/rctl.h>
57#include <sys/refcount.h>
58#include <sys/sx.h>
59#include <sys/sysent.h>
60#include <sys/namei.h>
61#include <sys/mount.h>
62#include <sys/queue.h>
63#include <sys/socket.h>
64#include <sys/syscallsubr.h>
65#include <sys/sysctl.h>
66#include <sys/uuid.h>
67#include <sys/vnode.h>
68
69#include <net/if.h>
70#include <net/vnet.h>
71
72#include <netinet/in.h>
73
74#ifdef DDB
75#include <ddb/ddb.h>
76#endif /* DDB */
77
78#include <security/mac/mac_framework.h>
79
80#define PRISON0_HOSTUUID_MODULE "hostuuid"
81
82MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
83static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
84
85/* Keep struct prison prison0 and some code in kern_jail_set() readable. */
86#ifdef INET
87#ifdef INET6
88#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
89#else
90#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
91#endif
92#else /* !INET */
93#ifdef INET6
94#define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
95#else
96#define _PR_IP_SADDRSEL 0
97#endif
98#endif
99
100/* prison0 describes what is "real" about the system. */
101struct prison prison0 = {
102 .pr_id = 0,
103 .pr_name = "0",
104 .pr_ref = 1,
105 .pr_uref = 1,
106 .pr_path = "/",
107 .pr_securelevel = -1,
108 .pr_devfs_rsnum = 0,
109 .pr_state = PRISON_STATE_ALIVE,
110 .pr_childmax = JAIL_MAX,
111 .pr_hostuuid = DEFAULT_HOSTUUID,
112 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children),
113#ifdef VIMAGE
114 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
115#else
116 .pr_flags = PR_HOST|_PR_IP_SADDRSEL,
117#endif
118 .pr_allow = PR_ALLOW_ALL_STATIC,
119};
120MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
121
122struct bool_flags {
123 const char *name;
124 const char *noname;
125 volatile u_int flag;
126};
127struct jailsys_flags {
128 const char *name;
129 unsigned disable;
130 unsigned new;
131};
132
133/* allprison, allprison_racct and lastprid are protected by allprison_lock. */
134struct sx allprison_lock;
135SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
136struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
137LIST_HEAD(, prison_racct) allprison_racct;
138int lastprid = 0;
139
140static int get_next_prid(struct prison **insprp);
141static int do_jail_attach(struct thread *td, struct prison *pr, int drflags);
142static void prison_complete(void *context, int pending);
143static void prison_deref(struct prison *pr, int flags);
144static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison);
145static int prison_lock_xlock(struct prison *pr, int flags);
146static void prison_free_not_last(struct prison *pr);
147static void prison_proc_free_not_last(struct prison *pr);
148static void prison_set_allow_locked(struct prison *pr, unsigned flag,
149 int enable);
150static char *prison_path(struct prison *pr1, struct prison *pr2);
151#ifdef RACCT
152static void prison_racct_attach(struct prison *pr);
153static void prison_racct_modify(struct prison *pr);
154static void prison_racct_detach(struct prison *pr);
155#endif
156
157/* Flags for prison_deref */
158#define PD_DEREF 0x01 /* Decrement pr_ref */
159#define PD_DEUREF 0x02 /* Decrement pr_uref */
160#define PD_KILL 0x04 /* Remove jail, kill processes, etc */
161#define PD_LOCKED 0x10 /* pr_mtx is held */
162#define PD_LIST_SLOCKED 0x20 /* allprison_lock is held shared */
163#define PD_LIST_XLOCKED 0x40 /* allprison_lock is held exclusive */
164#define PD_OP_FLAGS 0x07 /* Operation flags */
165#define PD_LOCK_FLAGS 0x70 /* Lock status flags */
166
167/*
168 * Parameter names corresponding to PR_* flag values. Size values are for kvm
169 * as we cannot figure out the size of a sparse array, or an array without a
170 * terminating entry.
171 */
172static struct bool_flags pr_flag_bool[] = {
173 {"persist", "nopersist", PR_PERSIST},
174#ifdef INET
175 {"ip4.saddrsel", "ip4.nosaddrsel", PR_IP4_SADDRSEL},
176#endif
177#ifdef INET6
178 {"ip6.saddrsel", "ip6.nosaddrsel", PR_IP6_SADDRSEL},
179#endif
180};
181const size_t pr_flag_bool_size = sizeof(pr_flag_bool);
182
183static struct jailsys_flags pr_flag_jailsys[] = {
184 {"host", 0, PR_HOST},
185#ifdef VIMAGE
186 {"vnet", 0, PR_VNET},
187#endif
188#ifdef INET
189 {"ip4", PR_IP4_USER, PR_IP4_USER},
190#endif
191#ifdef INET6
192 {"ip6", PR_IP6_USER, PR_IP6_USER},
193#endif
194};
195const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
196
197/*
198 * Make this array full-size so dynamic parameters can be added.
199 * It is protected by prison0.mtx, but lockless reading is allowed
200 * with an atomic check of the flag values.
201 */
202static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
203 {"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
204 {"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
205 {"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
206 {"allow.chflags", "allow.nochflags", PR_ALLOW_CHFLAGS},
207 {"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
208 {"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
209 {"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
210 {"allow.mlock", "allow.nomlock", PR_ALLOW_MLOCK},
211 {"allow.reserved_ports", "allow.noreserved_ports",
212 PR_ALLOW_RESERVED_PORTS},
213 {"allow.read_msgbuf", "allow.noread_msgbuf", PR_ALLOW_READ_MSGBUF},
214 {"allow.unprivileged_proc_debug", "allow.nounprivileged_proc_debug",
215 PR_ALLOW_UNPRIV_DEBUG},
216 {"allow.suser", "allow.nosuser", PR_ALLOW_SUSER},
217};
218static unsigned pr_allow_all = PR_ALLOW_ALL_STATIC;
219const size_t pr_flag_allow_size = sizeof(pr_flag_allow);
220
221#define JAIL_DEFAULT_ALLOW (PR_ALLOW_SET_HOSTNAME | \
222 PR_ALLOW_RESERVED_PORTS | \
223 PR_ALLOW_UNPRIV_DEBUG | \
224 PR_ALLOW_SUSER)
225#define JAIL_DEFAULT_ENFORCE_STATFS 2
226#define JAIL_DEFAULT_DEVFS_RSNUM 0
227static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
228static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
229static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
230#if defined(INET) || defined(INET6)
231static unsigned jail_max_af_ips = 255;
232#endif
233
234/*
235 * Initialize the parts of prison0 that can't be static-initialized with
236 * constants. This is called from proc0_init() after creating thread0 cpuset.
237 */
238void
239prison0_init(void)
240{
241 uint8_t *file, *data;
242 size_t size;
243 char buf[sizeof(prison0.pr_hostuuid)];
244 bool valid;
245
246 prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
247 prison0.pr_osreldate = osreldate;
248 strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
249
250 /* If we have a preloaded hostuuid, use it. */
251 file = preload_search_by_type(PRISON0_HOSTUUID_MODULE);
252 if (file != NULL) {
253 data = preload_fetch_addr(file);
254 size = preload_fetch_size(file);
255 if (data != NULL) {
256 /*
257 * The preloaded data may include trailing whitespace, almost
258 * certainly a newline; skip over any whitespace or
259 * non-printable characters to be safe.
260 */
261 while (size > 0 && data[size - 1] <= 0x20) {
262 size--;
263 }
264
265 valid = false;
266
267 /*
268 * Not NUL-terminated when passed from loader, but
269 * validate_uuid requires that due to using sscanf (as
270 * does the subsequent strlcpy, since it still reads
271 * past the given size to return the true length);
272 * bounce to a temporary buffer to fix.
273 */
274 if (size >= sizeof(buf))
275 goto done;
276
277 memcpy(buf, data, size);
278 buf[size] = '\0';
279
280 if (validate_uuid(buf, size, NULL, 0) != 0)
281 goto done;
282
283 valid = true;
284 (void)strlcpy(prison0.pr_hostuuid, buf,
285 sizeof(prison0.pr_hostuuid));
286
287done:
288 if (bootverbose && !valid) {
289 printf("hostuuid: preload data malformed: '%.*s'\n",
290 (int)size, data);
291 }
292 }
293 }
294 if (bootverbose)
295 printf("hostuuid: using %s\n", prison0.pr_hostuuid);
296}
297
298/*
299 * struct jail_args {
300 * struct jail *jail;
301 * };
302 */
303int
304sys_jail(struct thread *td, struct jail_args *uap)
305{
306 uint32_t version;
307 int error;
308 struct jail j;
309
310 error = copyin(uap->jail, &version, sizeof(uint32_t));
311 if (error)
312 return (error);
313
314 switch (version) {
315 case 0:
316 {
317 struct jail_v0 j0;
318
319 /* FreeBSD single IPv4 jails. */
320 bzero(&j, sizeof(struct jail));
321 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
322 if (error)
323 return (error);
324 j.version = j0.version;
325 j.path = j0.path;
326 j.hostname = j0.hostname;
327 j.ip4s = htonl(j0.ip_number); /* jail_v0 is host order */
328 break;
329 }
330
331 case 1:
332 /*
333 * Version 1 was used by multi-IPv4 jail implementations
334 * that never made it into the official kernel.
335 */
336 return (EINVAL);
337
338 case 2: /* JAIL_API_VERSION */
339 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
340 error = copyin(uap->jail, &j, sizeof(struct jail));
341 if (error)
342 return (error);
343 break;
344
345 default:
346 /* Sci-Fi jails are not supported, sorry. */
347 return (EINVAL);
348 }
349 return (kern_jail(td, &j));
350}
351
352int
353kern_jail(struct thread *td, struct jail *j)
354{
355 struct iovec optiov[2 * (4 + nitems(pr_flag_allow)
356#ifdef INET
357 + 1
358#endif
359#ifdef INET6
360 + 1
361#endif
362 )];
363 struct uio opt;
364 char *u_path, *u_hostname, *u_name;
365 struct bool_flags *bf;
366#ifdef INET
367 uint32_t ip4s;
368 struct in_addr *u_ip4;
369#endif
370#ifdef INET6
371 struct in6_addr *u_ip6;
372#endif
373 size_t tmplen;
374 int error, enforce_statfs;
375
376 bzero(&optiov, sizeof(optiov));
377 opt.uio_iov = optiov;
378 opt.uio_iovcnt = 0;
379 opt.uio_offset = -1;
380 opt.uio_resid = -1;
381 opt.uio_segflg = UIO_SYSSPACE;
382 opt.uio_rw = UIO_READ;
383 opt.uio_td = td;
384
385 /* Set permissions for top-level jails from sysctls. */
386 if (!jailed(td->td_ucred)) {
387 for (bf = pr_flag_allow;
388 bf < pr_flag_allow + nitems(pr_flag_allow) &&
389 atomic_load_int(&bf->flag) != 0;
390 bf++) {
391 optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
392 (jail_default_allow & bf->flag)
393 ? bf->name : bf->noname);
394 optiov[opt.uio_iovcnt].iov_len =
395 strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
396 opt.uio_iovcnt += 2;
397 }
398 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
399 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
400 opt.uio_iovcnt++;
401 enforce_statfs = jail_default_enforce_statfs;
402 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
403 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
404 opt.uio_iovcnt++;
405 }
406
407 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
408#ifdef INET
409 ip4s = (j->version == 0) ? 1 : j->ip4s;
410 if (ip4s > jail_max_af_ips)
411 return (EINVAL);
412 tmplen += ip4s * sizeof(struct in_addr);
413#else
414 if (j->ip4s > 0)
415 return (EINVAL);
416#endif
417#ifdef INET6
418 if (j->ip6s > jail_max_af_ips)
419 return (EINVAL);
420 tmplen += j->ip6s * sizeof(struct in6_addr);
421#else
422 if (j->ip6s > 0)
423 return (EINVAL);
424#endif
425 u_path = malloc(tmplen, M_TEMP, M_WAITOK);
426 u_hostname = u_path + MAXPATHLEN;
427 u_name = u_hostname + MAXHOSTNAMELEN;
428#ifdef INET
429 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
430#endif
431#ifdef INET6
432#ifdef INET
433 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
434#else
435 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
436#endif
437#endif
438 optiov[opt.uio_iovcnt].iov_base = "path";
439 optiov[opt.uio_iovcnt].iov_len = sizeof("path");
440 opt.uio_iovcnt++;
441 optiov[opt.uio_iovcnt].iov_base = u_path;
442 error = copyinstr(j->path, u_path, MAXPATHLEN,
443 &optiov[opt.uio_iovcnt].iov_len);
444 if (error) {
445 free(u_path, M_TEMP);
446 return (error);
447 }
448 opt.uio_iovcnt++;
449 optiov[opt.uio_iovcnt].iov_base = "host.hostname";
450 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
451 opt.uio_iovcnt++;
452 optiov[opt.uio_iovcnt].iov_base = u_hostname;
453 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
454 &optiov[opt.uio_iovcnt].iov_len);
455 if (error) {
456 free(u_path, M_TEMP);
457 return (error);
458 }
459 opt.uio_iovcnt++;
460 if (j->jailname != NULL) {
461 optiov[opt.uio_iovcnt].iov_base = "name";
462 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
463 opt.uio_iovcnt++;
464 optiov[opt.uio_iovcnt].iov_base = u_name;
465 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
466 &optiov[opt.uio_iovcnt].iov_len);
467 if (error) {
468 free(u_path, M_TEMP);
469 return (error);
470 }
471 opt.uio_iovcnt++;
472 }
473#ifdef INET
474 optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
475 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
476 opt.uio_iovcnt++;
477 optiov[opt.uio_iovcnt].iov_base = u_ip4;
478 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
479 if (j->version == 0)
480 u_ip4->s_addr = j->ip4s;
481 else {
482 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
483 if (error) {
484 free(u_path, M_TEMP);
485 return (error);
486 }
487 }
488 opt.uio_iovcnt++;
489#endif
490#ifdef INET6
491 optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
492 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
493 opt.uio_iovcnt++;
494 optiov[opt.uio_iovcnt].iov_base = u_ip6;
495 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
496 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
497 if (error) {
498 free(u_path, M_TEMP);
499 return (error);
500 }
501 opt.uio_iovcnt++;
502#endif
503 KASSERT(opt.uio_iovcnt <= nitems(optiov),
504 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
505 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
506 free(u_path, M_TEMP);
507 return (error);
508}
509
510/*
511 * struct jail_set_args {
512 * struct iovec *iovp;
513 * unsigned int iovcnt;
514 * int flags;
515 * };
516 */
517int
518sys_jail_set(struct thread *td, struct jail_set_args *uap)
519{
520 struct uio *auio;
521 int error;
522
523 /* Check that we have an even number of iovecs. */
524 if (uap->iovcnt & 1)
525 return (EINVAL);
526
527 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
528 if (error)
529 return (error);
530 error = kern_jail_set(td, auio, uap->flags);
531 free(auio, M_IOV);
532 return (error);
533}
534
535#if defined(INET) || defined(INET6)
536typedef int prison_addr_cmp_t(const void *, const void *);
537typedef bool prison_addr_valid_t(const void *);
538static const struct pr_family {
539 size_t size;
540 prison_addr_cmp_t *cmp;
541 prison_addr_valid_t *valid;
542 int ip_flag;
543} pr_families[PR_FAMILY_MAX] = {
544#ifdef INET
545 [PR_INET] = {
546 .size = sizeof(struct in_addr),
547 .cmp = prison_qcmp_v4,
548 .valid = prison_valid_v4,
549 .ip_flag = PR_IP4_USER,
550 },
551#endif
552#ifdef INET6
553 [PR_INET6] = {
554 .size = sizeof(struct in6_addr),
555 .cmp = prison_qcmp_v6,
556 .valid = prison_valid_v6,
557 .ip_flag = PR_IP6_USER,
558 },
559#endif
560};
561
562/*
563 * Network address lists (pr_addrs) allocation for jails. The addresses
564 * are accessed locklessly by the network stack, thus need to be protected by
565 * the network epoch.
566 */
567struct prison_ip {
568 struct epoch_context ctx;
569 uint32_t ips;
570#ifdef FUTURE_C
571 union {
572 struct in_addr pr_ip4[];
573 struct in6_addr pr_ip6[];
574 };
575#else /* No future C :( */
576#define PR_IP(pip, i) ((const char *)((pip) + 1) + pr_families[af].size * (i))
577#define PR_IPD(pip, i) ((char *)((pip) + 1) + pr_families[af].size * (i))
578#endif
579};
580
581static struct prison_ip *
582prison_ip_alloc(const pr_family_t af, uint32_t cnt, int flags)
583{
584 struct prison_ip *pip;
585
586 pip = malloc(sizeof(struct prison_ip) + cnt * pr_families[af].size,
587 M_PRISON, flags);
588 if (pip != NULL)
589 pip->ips = cnt;
590 return (pip);
591}
592
593/*
594 * Allocate and copyin user supplied address list, sorting and validating.
595 * kern_jail_set() helper.
596 */
597static struct prison_ip *
598prison_ip_copyin(const pr_family_t af, void *op, uint32_t cnt)
599{
600 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
601 const size_t size = pr_families[af].size;
602 struct prison_ip *pip;
603
604 pip = prison_ip_alloc(af, cnt, M_WAITOK);
605 bcopy(op, pip + 1, cnt * size);
606 /*
607 * IP addresses are all sorted but ip[0] to preserve
608 * the primary IP address as given from userland.
609 * This special IP is used for unbound outgoing
610 * connections as well for "loopback" traffic in case
611 * source address selection cannot find any more fitting
612 * address to connect from.
613 */
614 if (cnt > 1)
615 qsort((char *)(pip + 1) + size, cnt - 1, size,
616 pr_families[af].cmp);
617 /*
618 * Check for duplicate addresses and do some simple
619 * zero and broadcast checks. If users give other bogus
620 * addresses it is their problem.
621 */
622 for (int i = 0; i < cnt; i++) {
623 if (!pr_families[af].valid(PR_IP(pip, i))) {
624 free(pip, M_PRISON);
625 return (NULL);
626 }
627 if (i + 1 < cnt &&
628 (cmp(PR_IP(pip, 0), PR_IP(pip, i + 1)) == 0 ||
629 cmp(PR_IP(pip, i), PR_IP(pip, i + 1)) == 0)) {
630 free(pip, M_PRISON);
631 return (NULL);
632 }
633 }
634
635 return (pip);
636}
637
638/*
639 * Allocate and dup parent prison address list.
640 * kern_jail_set() helper.
641 */
642static void
643prison_ip_dup(struct prison *ppr, struct prison *pr, const pr_family_t af)
644{
645
646 if (ppr->pr_addrs[af] != NULL) {
647 pr->pr_addrs[af] = prison_ip_alloc(af,
648 ppr->pr_addrs[af]->ips, M_WAITOK);
649 bcopy(ppr->pr_addrs[af], pr->pr_addrs[af],
650 pr->pr_addrs[af]->ips * pr_families[af].size);
651 }
652}
653
654/*
655 * Make sure the new set of IP addresses is a subset of the parent's list.
656 * Don't worry about the parent being unlocked, as any setting is done with
657 * allprison_lock held.
658 * kern_jail_set() helper.
659 */
660static bool
661prison_ip_parent_match(const struct prison_ip *ppip,
662 const struct prison_ip *pip, const pr_family_t af)
663{
664 prison_addr_cmp_t *const cmp = pr_families[af].cmp;
665 int i, j;
666
667 if (ppip == NULL)
668 return (false);
669
670 for (i = 0; i < ppip->ips; i++)
671 if (cmp(PR_IP(pip, 0), PR_IP(ppip, i)) == 0)
672 break;
673
674 if (i == ppip->ips)
675 /* Main address not present in parent. */
676 return (false);
677
678 if (pip->ips > 1) {
679 for (i = j = 1; i < pip->ips; i++) {
680 if (cmp(PR_IP(pip, i), PR_IP(ppip, 0)) == 0)
681 /* Equals to parent primary address. */
682 continue;
683 for (; j < ppip->ips; j++)
684 if (cmp(PR_IP(pip, i), PR_IP(ppip, j)) == 0)
685 break;
686 if (j == ppip->ips)
687 break;
688 }
689 if (j == ppip->ips)
690 /* Address not present in parent. */
691 return (false);
692 }
693 return (true);
694}
695
696/*
697 * Check for conflicting IP addresses. We permit them if there is no more
698 * than one IP on each jail. If there is a duplicate on a jail with more
699 * than one IP stop checking and return error.
700 * kern_jail_set() helper.
701 */
702static bool
703prison_ip_conflict_check(const struct prison *ppr, const struct prison *pr,
704 const struct prison_ip *pip, pr_family_t af)
705{
706 const struct prison *tppr, *tpr;
707 int descend;
708
709#ifdef VIMAGE
710 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
711 if (tppr->pr_flags & PR_VNET)
712 break;
713#else
714 tppr = &prison0;
715#endif
716 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
717 if (tpr == pr ||
718#ifdef VIMAGE
719 (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
720#endif
721 !prison_isalive(tpr)) {
722 descend = 0;
723 continue;
724 }
725 if (!(tpr->pr_flags & pr_families[af].ip_flag))
726 continue;
727 descend = 0;
728 if (tpr->pr_addrs[af] == NULL ||
729 (pip->ips == 1 && tpr->pr_addrs[af]->ips == 1))
730 continue;
731 for (int i = 0; i < pip->ips; i++)
732 if (prison_ip_check(tpr, af, PR_IP(pip, i)) == 0)
733 return (false);
734 }
735
736 return (true);
737}
738
739_Static_assert(offsetof(struct prison_ip, ctx) == 0,
740 "prison must start with epoch context");
741static void
742prison_ip_free_deferred(epoch_context_t ctx)
743{
744
745 free(ctx, M_PRISON);
746}
747
748static void
749prison_ip_free(struct prison_ip *pip)
750{
751
752 if (pip != NULL)
753 NET_EPOCH_CALL(prison_ip_free_deferred, &pip->ctx);
754}
755
756static void
757prison_ip_set(struct prison *pr, const pr_family_t af, struct prison_ip *new)
758{
759 struct prison_ip **mem, *old;
760
761 mtx_assert(&pr->pr_mtx, MA_OWNED);
762
763 mem = &pr->pr_addrs[af];
764
765 old = *mem;
766 ck_pr_store_ptr(mem, new);
767 prison_ip_free(old);
768}
769
770/*
771 * Restrict a prison's IP address list with its parent's, possibly replacing
772 * it. Return true if the replacement buffer was used (or would have been).
773 * kern_jail_set() helper.
774 */
775static bool
776prison_ip_restrict(struct prison *pr, const pr_family_t af,
777 struct prison_ip *new)
778{
779 const struct prison_ip *ppip = pr->pr_parent->pr_addrs[af];
780 const struct prison_ip *pip = pr->pr_addrs[af];
781 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
782 const size_t size = pr_families[af].size;
783 uint32_t ips;
784 bool alloced;
785
786 mtx_assert(&pr->pr_mtx, MA_OWNED);
787
788 /*
789 * Due to epoch-synchronized access to the IP address lists we always
790 * allocate a new list even if the old one has enough space. We could
791 * atomically update an IPv4 address inside a list, but that would
792 * screw up sorting, and in case of IPv6 we can't even atomically write
793 * one.
794 */
795 ips = (pr->pr_flags & pr_families[af].ip_flag) ? pip->ips : ppip->ips;
796 if (ips == 0) {
797 prison_ip_set(pr, af, NULL);
798 return (false);
799 }
800 if (new == NULL) {
801 new = prison_ip_alloc(af, ips, M_NOWAIT);
802 if (new == NULL)
803 return (true);
804 alloced = true;
805 } else
806 alloced = false;
807 if (!(pr->pr_flags & pr_families[af].ip_flag)) {
808 /* This has no user settings, so just copy the parent's list. */
809 bcopy(ppip, new, ips * size);
810 } else {
811 /* Remove addresses that aren't in the parent. */
812 int i;
813
814 i = 0; /* index in pip */
815 ips = 0; /* index in new */
816
817 for (int pi = 0; pi < ppip->ips; pi++)
818 if (cmp(PR_IP(pip, 0), PR_IP(ppip, pi)) == 0) {
819 /* Found our primary address in parent. */
820 bcopy(PR_IP(pip, i), PR_IPD(new, ips), size);
821 i++;
822 ips++;
823 break;
824 }
825 for (int pi = 1; i < pip->ips; ) {
826 /* Check against primary, which is unsorted. */
827 if (cmp(PR_IP(pip, i), PR_IP(ppip, 0)) == 0) {
828 /* Matches parent's primary address. */
829 bcopy(PR_IP(pip, i), PR_IPD(new, ips), size);
830 i++;
831 ips++;
832 continue;
833 }
834 /* The rest are sorted. */
835 switch (pi >= ppip->ips ? -1 :
836 cmp(PR_IP(pip, i), PR_IP(ppip, pi))) {
837 case -1:
838 i++;
839 break;
840 case 0:
841 bcopy(PR_IP(pr, i), PR_IPD(new, ips), size);
842 i++;
843 pi++;
844 ips++;
845 break;
846 case 1:
847 pi++;
848 break;
849 }
850 }
851 if (ips == 0) {
852 if (alloced)
853 prison_ip_free(new);
854 new = NULL;
855 }
856 }
857 prison_ip_set(pr, af, new);
858 return (new != NULL ? true : false);
859}
860
861/*
862 * Fast-path check if an address belongs to a prison.
863 */
864int
865prison_ip_check(const struct prison *pr, const pr_family_t af,
866 const void *addr)
867{
868 int (*const cmp)(const void *, const void *) = pr_families[af].cmp;
869 const struct prison_ip *pip;
870 int i, a, z, d;
871
872 MPASS(mtx_owned(&pr->pr_mtx) ||
873 in_epoch(net_epoch_preempt) ||
874 sx_xlocked(&allprison_lock));
875
876 pip = ck_pr_load_ptr(&pr->pr_addrs[af]);
877 if (__predict_false(pip == NULL))
878 return (EAFNOSUPPORT);
879
880 /* Check the primary IP. */
881 if (cmp(PR_IP(pip, 0), addr) == 0)
882 return (0);
883
884 /*
885 * All the other IPs are sorted so we can do a binary search.
886 */
887 a = 0;
888 z = pip->ips - 2;
889 while (a <= z) {
890 i = (a + z) / 2;
891 d = cmp(PR_IP(pip, i + 1), addr);
892 if (d > 0)
893 z = i - 1;
894 else if (d < 0)
895 a = i + 1;
896 else
897 return (0);
898 }
899
900 return (EADDRNOTAVAIL);
901}
902
903/*
904 * Grab primary IP. Historically required mutex, but nothing prevents
905 * us to support epoch-protected access. Is it used in fast path?
906 * in{6}_jail.c helper
907 */
908const void *
909prison_ip_get0(const struct prison *pr, const pr_family_t af)
910{
911 const struct prison_ip *pip = pr->pr_addrs[af];
912
913 mtx_assert(&pr->pr_mtx, MA_OWNED);
914 MPASS(pip);
915
916 return (pip + 1);
917}
918
919u_int
920prison_ip_cnt(const struct prison *pr, const pr_family_t af)
921{
922
923 return (pr->pr_addrs[af]->ips);
924}
925#endif /* defined(INET) || defined(INET6) */
926
927int
928kern_jail_set(struct thread *td, struct uio *optuio, int flags)
929{
930 struct nameidata nd;
931#ifdef INET
932 struct prison_ip *ip4;
933#endif
934#ifdef INET6
935 struct prison_ip *ip6;
936#endif
937 struct vfsopt *opt;
938 struct vfsoptlist *opts;
939 struct prison *pr, *deadpr, *inspr, *mypr, *ppr, *tpr;
940 struct vnode *root;
941 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
942 char *g_path, *osrelstr;
943 struct bool_flags *bf;
944 struct jailsys_flags *jsf;
945#if defined(INET) || defined(INET6)
946 void *op;
947#endif
948 unsigned long hid;
949 size_t namelen, onamelen, pnamelen;
950 int born, created, cuflags, descend, drflags, enforce;
951 int error, errmsg_len, errmsg_pos;
952 int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
953 int jid, jsys, len, level;
954 int childmax, osreldt, rsnum, slevel;
955#ifdef INET
956 int ip4s, redo_ip4;
957#endif
958#ifdef INET6
959 int ip6s, redo_ip6;
960#endif
961 uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
962 uint64_t pr_allow_diff;
963 unsigned tallow;
964 char numbuf[12];
965
966 error = priv_check(td, PRIV_JAIL_SET);
967 if (!error && (flags & JAIL_ATTACH))
968 error = priv_check(td, PRIV_JAIL_ATTACH);
969 if (error)
970 return (error);
971 mypr = td->td_ucred->cr_prison;
972 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
973 return (EPERM);
974 if (flags & ~JAIL_SET_MASK)
975 return (EINVAL);
976
977 /*
978 * Check all the parameters before committing to anything. Not all
979 * errors can be caught early, but we may as well try. Also, this
980 * takes care of some expensive stuff (path lookup) before getting
981 * the allprison lock.
982 *
983 * XXX Jails are not filesystems, and jail parameters are not mount
984 * options. But it makes more sense to re-use the vfsopt code
985 * than duplicate it under a different name.
986 */
987 error = vfs_buildopts(optuio, &opts);
988 if (error)
989 return (error);
990#ifdef INET
991 ip4 = NULL;
992#endif
993#ifdef INET6
994 ip6 = NULL;
995#endif
996 g_path = NULL;
997
998 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
999 if (!cuflags) {
1000 error = EINVAL;
1001 vfs_opterror(opts, "no valid operation (create or update)");
1002 goto done_errmsg;
1003 }
1004
1005 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
1006 if (error == ENOENT)
1007 jid = 0;
1008 else if (error != 0)
1009 goto done_free;
1010
1011 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
1012 if (error == ENOENT)
1013 gotslevel = 0;
1014 else if (error != 0)
1015 goto done_free;
1016 else
1017 gotslevel = 1;
1018
1019 error =
1020 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
1021 if (error == ENOENT)
1022 gotchildmax = 0;
1023 else if (error != 0)
1024 goto done_free;
1025 else
1026 gotchildmax = 1;
1027
1028 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
1029 if (error == ENOENT)
1030 gotenforce = 0;
1031 else if (error != 0)
1032 goto done_free;
1033 else if (enforce < 0 || enforce > 2) {
1034 error = EINVAL;
1035 goto done_free;
1036 } else
1037 gotenforce = 1;
1038
1039 error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
1040 if (error == ENOENT)
1041 gotrsnum = 0;
1042 else if (error != 0)
1043 goto done_free;
1044 else
1045 gotrsnum = 1;
1046
1047 pr_flags = ch_flags = 0;
1048 for (bf = pr_flag_bool;
1049 bf < pr_flag_bool + nitems(pr_flag_bool);
1050 bf++) {
1051 vfs_flagopt(opts, bf->name, &pr_flags, bf->flag);
1052 vfs_flagopt(opts, bf->noname, &ch_flags, bf->flag);
1053 }
1054 ch_flags |= pr_flags;
1055 for (jsf = pr_flag_jailsys;
1056 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
1057 jsf++) {
1058 error = vfs_copyopt(opts, jsf->name, &jsys, sizeof(jsys));
1059 if (error == ENOENT)
1060 continue;
1061 if (error != 0)
1062 goto done_free;
1063 switch (jsys) {
1064 case JAIL_SYS_DISABLE:
1065 if (!jsf->disable) {
1066 error = EINVAL;
1067 goto done_free;
1068 }
1069 pr_flags |= jsf->disable;
1070 break;
1071 case JAIL_SYS_NEW:
1072 pr_flags |= jsf->new;
1073 break;
1074 case JAIL_SYS_INHERIT:
1075 break;
1076 default:
1077 error = EINVAL;
1078 goto done_free;
1079 }
1080 ch_flags |= jsf->new | jsf->disable;
1081 }
1082 if ((flags & (JAIL_CREATE | JAIL_ATTACH)) == JAIL_CREATE
1083 && !(pr_flags & PR_PERSIST)) {
1084 error = EINVAL;
1085 vfs_opterror(opts, "new jail must persist or attach");
1086 goto done_errmsg;
1087 }
1088#ifdef VIMAGE
1089 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
1090 error = EINVAL;
1091 vfs_opterror(opts, "vnet cannot be changed after creation");
1092 goto done_errmsg;
1093 }
1094#endif
1095#ifdef INET
1096 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
1097 error = EINVAL;
1098 vfs_opterror(opts, "ip4 cannot be changed after creation");
1099 goto done_errmsg;
1100 }
1101#endif
1102#ifdef INET6
1103 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
1104 error = EINVAL;
1105 vfs_opterror(opts, "ip6 cannot be changed after creation");
1106 goto done_errmsg;
1107 }
1108#endif
1109
1110 pr_allow = ch_allow = 0;
1111 for (bf = pr_flag_allow;
1112 bf < pr_flag_allow + nitems(pr_flag_allow) &&
1113 atomic_load_int(&bf->flag) != 0;
1114 bf++) {
1115 vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
1116 vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
1117 }
1118 ch_allow |= pr_allow;
1119
1120 error = vfs_getopt(opts, "name", (void **)&name, &len);
1121 if (error == ENOENT)
1122 name = NULL;
1123 else if (error != 0)
1124 goto done_free;
1125 else {
1126 if (len == 0 || name[len - 1] != '\0') {
1127 error = EINVAL;
1128 goto done_free;
1129 }
1130 if (len > MAXHOSTNAMELEN) {
1131 error = ENAMETOOLONG;
1132 goto done_free;
1133 }
1134 }
1135
1136 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
1137 if (error == ENOENT)
1138 host = NULL;
1139 else if (error != 0)
1140 goto done_free;
1141 else {
1142 ch_flags |= PR_HOST;
1143 pr_flags |= PR_HOST;
1144 if (len == 0 || host[len - 1] != '\0') {
1145 error = EINVAL;
1146 goto done_free;
1147 }
1148 if (len > MAXHOSTNAMELEN) {
1149 error = ENAMETOOLONG;
1150 goto done_free;
1151 }
1152 }
1153
1154 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
1155 if (error == ENOENT)
1156 domain = NULL;
1157 else if (error != 0)
1158 goto done_free;
1159 else {
1160 ch_flags |= PR_HOST;
1161 pr_flags |= PR_HOST;
1162 if (len == 0 || domain[len - 1] != '\0') {
1163 error = EINVAL;
1164 goto done_free;
1165 }
1166 if (len > MAXHOSTNAMELEN) {
1167 error = ENAMETOOLONG;
1168 goto done_free;
1169 }
1170 }
1171
1172 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
1173 if (error == ENOENT)
1174 uuid = NULL;
1175 else if (error != 0)
1176 goto done_free;
1177 else {
1178 ch_flags |= PR_HOST;
1179 pr_flags |= PR_HOST;
1180 if (len == 0 || uuid[len - 1] != '\0') {
1181 error = EINVAL;
1182 goto done_free;
1183 }
1184 if (len > HOSTUUIDLEN) {
1185 error = ENAMETOOLONG;
1186 goto done_free;
1187 }
1188 }
1189
1190#ifdef COMPAT_FREEBSD32
1191 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
1192 uint32_t hid32;
1193
1194 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
1195 hid = hid32;
1196 } else
1197#endif
1198 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
1199 if (error == ENOENT)
1200 gothid = 0;
1201 else if (error != 0)
1202 goto done_free;
1203 else {
1204 gothid = 1;
1205 ch_flags |= PR_HOST;
1206 pr_flags |= PR_HOST;
1207 }
1208
1209#ifdef INET
1210 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
1211 if (error == ENOENT)
1212 ip4s = 0;
1213 else if (error != 0)
1214 goto done_free;
1215 else if (ip4s & (sizeof(struct in_addr) - 1)) {
1216 error = EINVAL;
1217 goto done_free;
1218 } else {
1219 ch_flags |= PR_IP4_USER;
1220 pr_flags |= PR_IP4_USER;
1221 if (ip4s > 0) {
1222 ip4s /= sizeof(struct in_addr);
1223 if (ip4s > jail_max_af_ips) {
1224 error = EINVAL;
1225 vfs_opterror(opts, "too many IPv4 addresses");
1226 goto done_errmsg;
1227 }
1228 ip4 = prison_ip_copyin(PR_INET, op, ip4s);
1229 if (ip4 == NULL) {
1230 error = EINVAL;
1231 goto done_free;
1232 }
1233 }
1234 }
1235#endif
1236
1237#ifdef INET6
1238 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
1239 if (error == ENOENT)
1240 ip6s = 0;
1241 else if (error != 0)
1242 goto done_free;
1243 else if (ip6s & (sizeof(struct in6_addr) - 1)) {
1244 error = EINVAL;
1245 goto done_free;
1246 } else {
1247 ch_flags |= PR_IP6_USER;
1248 pr_flags |= PR_IP6_USER;
1249 if (ip6s > 0) {
1250 ip6s /= sizeof(struct in6_addr);
1251 if (ip6s > jail_max_af_ips) {
1252 error = EINVAL;
1253 vfs_opterror(opts, "too many IPv6 addresses");
1254 goto done_errmsg;
1255 }
1256 ip6 = prison_ip_copyin(PR_INET6, op, ip6s);
1257 if (ip6 == NULL) {
1258 error = EINVAL;
1259 goto done_free;
1260 }
1261 }
1262 }
1263#endif
1264
1265#if defined(VIMAGE) && (defined(INET) || defined(INET6))
1266 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1267 error = EINVAL;
1268 vfs_opterror(opts,
1269 "vnet jails cannot have IP address restrictions");
1270 goto done_errmsg;
1271 }
1272#endif
1273
1274 error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
1275 if (error == ENOENT)
1276 osrelstr = NULL;
1277 else if (error != 0)
1278 goto done_free;
1279 else {
1280 if (flags & JAIL_UPDATE) {
1281 error = EINVAL;
1282 vfs_opterror(opts,
1283 "osrelease cannot be changed after creation");
1284 goto done_errmsg;
1285 }
1286 if (len == 0 || osrelstr[len - 1] != '\0') {
1287 error = EINVAL;
1288 goto done_free;
1289 }
1290 if (len >= OSRELEASELEN) {
1291 error = ENAMETOOLONG;
1292 vfs_opterror(opts,
1293 "osrelease string must be 1-%d bytes long",
1294 OSRELEASELEN - 1);
1295 goto done_errmsg;
1296 }
1297 }
1298
1299 error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
1300 if (error == ENOENT)
1301 osreldt = 0;
1302 else if (error != 0)
1303 goto done_free;
1304 else {
1305 if (flags & JAIL_UPDATE) {
1306 error = EINVAL;
1307 vfs_opterror(opts,
1308 "osreldate cannot be changed after creation");
1309 goto done_errmsg;
1310 }
1311 if (osreldt == 0) {
1312 error = EINVAL;
1313 vfs_opterror(opts, "osreldate cannot be 0");
1314 goto done_errmsg;
1315 }
1316 }
1317
1318 root = NULL;
1319 error = vfs_getopt(opts, "path", (void **)&path, &len);
1320 if (error == ENOENT)
1321 path = NULL;
1322 else if (error != 0)
1323 goto done_free;
1324 else {
1325 if (flags & JAIL_UPDATE) {
1326 error = EINVAL;
1327 vfs_opterror(opts,
1328 "path cannot be changed after creation");
1329 goto done_errmsg;
1330 }
1331 if (len == 0 || path[len - 1] != '\0') {
1332 error = EINVAL;
1333 goto done_free;
1334 }
1335 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path);
1336 error = namei(&nd);
1337 if (error)
1338 goto done_free;
1339 root = nd.ni_vp;
1340 NDFREE(&nd, NDF_ONLY_PNBUF);
1341 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1342 strlcpy(g_path, path, MAXPATHLEN);
1343 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
1344 if (error == 0) {
1345 path = g_path;
1346 } else {
1347 /* exit on other errors */
1348 goto done_free;
1349 }
1350 if (root->v_type != VDIR) {
1351 error = ENOTDIR;
1352 vput(root);
1353 goto done_free;
1354 }
1355 VOP_UNLOCK(root);
1356 }
1357
1358 /*
1359 * Find the specified jail, or at least its parent.
1360 * This abuses the file error codes ENOENT and EEXIST.
1361 */
1362 pr = NULL;
1363 inspr = NULL;
1364 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
1365 namelc = strrchr(name, '.');
1366 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
1367 if (*p != '\0')
1368 jid = 0;
1369 }
1370 sx_xlock(&allprison_lock);
1371 drflags = PD_LIST_XLOCKED;
1372 ppr = mypr;
1373 if (!prison_isalive(ppr)) {
1374 /* This jail is dying. This process will surely follow. */
1375 error = EAGAIN;
1376 goto done_deref;
1377 }
1378 if (jid != 0) {
1379 if (jid < 0) {
1380 error = EINVAL;
1381 vfs_opterror(opts, "negative jid");
1382 goto done_deref;
1383 }
1384 /*
1385 * See if a requested jid already exists. Keep track of
1386 * where it can be inserted later.
1387 */
1388 TAILQ_FOREACH(inspr, &allprison, pr_list) {
1389 if (inspr->pr_id < jid)
1390 continue;
1391 if (inspr->pr_id > jid)
1392 break;
1393 pr = inspr;
1394 mtx_lock(&pr->pr_mtx);
1395 drflags |= PD_LOCKED;
1396 inspr = NULL;
1397 break;
1398 }
1399 if (pr != NULL) {
1400 /* Create: jid must not exist. */
1401 if (cuflags == JAIL_CREATE) {
1402 /*
1403 * Even creators that cannot see the jail will
1404 * get EEXIST.
1405 */
1406 error = EEXIST;
1407 vfs_opterror(opts, "jail %d already exists",
1408 jid);
1409 goto done_deref;
1410 }
1411 if (!prison_ischild(mypr, pr)) {
1412 /*
1413 * Updaters get ENOENT if they cannot see the
1414 * jail. This is true even for CREATE | UPDATE,
1415 * which normally cannot give this error.
1416 */
1417 error = ENOENT;
1418 vfs_opterror(opts, "jail %d not found", jid);
1419 goto done_deref;
1420 }
1421 ppr = pr->pr_parent;
1422 if (!prison_isalive(ppr)) {
1423 error = ENOENT;
1424 vfs_opterror(opts, "jail %d is dying",
1425 ppr->pr_id);
1426 goto done_deref;
1427 }
1428 if (!prison_isalive(pr)) {
1429 if (!(flags & JAIL_DYING)) {
1430 error = ENOENT;
1431 vfs_opterror(opts, "jail %d is dying",
1432 jid);
1433 goto done_deref;
1434 }
1435 if ((flags & JAIL_ATTACH) ||
1436 (pr_flags & PR_PERSIST)) {
1437 /*
1438 * A dying jail might be resurrected
1439 * (via attach or persist), but first
1440 * it must determine if another jail
1441 * has claimed its name. Accomplish
1442 * this by implicitly re-setting the
1443 * name.
1444 */
1445 if (name == NULL)
1446 name = prison_name(mypr, pr);
1447 }
1448 }
1449 } else {
1450 /* Update: jid must exist. */
1451 if (cuflags == JAIL_UPDATE) {
1452 error = ENOENT;
1453 vfs_opterror(opts, "jail %d not found", jid);
1454 goto done_deref;
1455 }
1456 }
1457 }
1458 /*
1459 * If the caller provided a name, look for a jail by that name.
1460 * This has different semantics for creates and updates keyed by jid
1461 * (where the name must not already exist in a different jail),
1462 * and updates keyed by the name itself (where the name must exist
1463 * because that is the jail being updated).
1464 */
1465 namelc = NULL;
1466 if (name != NULL) {
1467 namelc = strrchr(name, '.');
1468 if (namelc == NULL)
1469 namelc = name;
1470 else {
1471 /*
1472 * This is a hierarchical name. Split it into the
1473 * parent and child names, and make sure the parent
1474 * exists or matches an already found jail.
1475 */
1476 if (pr != NULL) {
1477 if (strncmp(name, ppr->pr_name, namelc - name)
1478 || ppr->pr_name[namelc - name] != '\0') {
1479 error = EINVAL;
1480 vfs_opterror(opts,
1481 "cannot change jail's parent");
1482 goto done_deref;
1483 }
1484 } else {
1485 *namelc = '\0';
1486 ppr = prison_find_name(mypr, name);
1487 if (ppr == NULL) {
1488 error = ENOENT;
1489 vfs_opterror(opts,
1490 "jail \"%s\" not found", name);
1491 goto done_deref;
1492 }
1493 mtx_unlock(&ppr->pr_mtx);
1494 if (!prison_isalive(ppr)) {
1495 error = ENOENT;
1496 vfs_opterror(opts,
1497 "jail \"%s\" is dying", name);
1498 goto done_deref;
1499 }
1500 *namelc = '.';
1501 }
1502 namelc++;
1503 }
1504 if (namelc[0] != '\0') {
1505 pnamelen =
1506 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1507 deadpr = NULL;
1508 FOREACH_PRISON_CHILD(ppr, tpr) {
1509 if (tpr != pr &&
1510 !strcmp(tpr->pr_name + pnamelen, namelc)) {
1511 if (prison_isalive(tpr)) {
1512 if (pr == NULL &&
1513 cuflags != JAIL_CREATE) {
1514 /*
1515 * Use this jail
1516 * for updates.
1517 */
1518 pr = tpr;
1519 mtx_lock(&pr->pr_mtx);
1520 drflags |= PD_LOCKED;
1521 break;
1522 }
1523 /*
1524 * Create, or update(jid):
1525 * name must not exist in an
1526 * active sibling jail.
1527 */
1528 error = EEXIST;
1529 vfs_opterror(opts,
1530 "jail \"%s\" already exists",
1531 name);
1532 goto done_deref;
1533 }
1534 if (pr == NULL &&
1535 cuflags != JAIL_CREATE) {
1536 deadpr = tpr;
1537 }
1538 }
1539 }
1540 /* If no active jail is found, use a dying one. */
1541 if (deadpr != NULL && pr == NULL) {
1542 if (flags & JAIL_DYING) {
1543 pr = deadpr;
1544 mtx_lock(&pr->pr_mtx);
1545 drflags |= PD_LOCKED;
1546 } else if (cuflags == JAIL_UPDATE) {
1547 error = ENOENT;
1548 vfs_opterror(opts,
1549 "jail \"%s\" is dying", name);
1550 goto done_deref;
1551 }
1552 }
1553 /* Update: name must exist if no jid. */
1554 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1555 error = ENOENT;
1556 vfs_opterror(opts, "jail \"%s\" not found",
1557 name);
1558 goto done_deref;
1559 }
1560 }
1561 }
1562 /* Update: must provide a jid or name. */
1563 else if (cuflags == JAIL_UPDATE && pr == NULL) {
1564 error = ENOENT;
1565 vfs_opterror(opts, "update specified no jail");
1566 goto done_deref;
1567 }
1568
1569 /* If there's no prison to update, create a new one and link it in. */
1570 created = pr == NULL;
1571 if (created) {
1572 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
1573 if (tpr->pr_childcount >= tpr->pr_childmax) {
1574 error = EPERM;
1575 vfs_opterror(opts, "prison limit exceeded");
1576 goto done_deref;
1577 }
1578 if (jid == 0 && (jid = get_next_prid(&inspr)) == 0) {
1579 error = EAGAIN;
1580 vfs_opterror(opts, "no available jail IDs");
1581 goto done_deref;
1582 }
1583
1584 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
1585 pr->pr_state = PRISON_STATE_INVALID;
1586 refcount_init(&pr->pr_ref, 1);
1587 refcount_init(&pr->pr_uref, 0);
1588 drflags |= PD_DEREF;
1589 LIST_INIT(&pr->pr_children);
1590 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
1591 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
1592
1593 pr->pr_id = jid;
1594 if (inspr != NULL)
1595 TAILQ_INSERT_BEFORE(inspr, pr, pr_list);
1596 else
1597 TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
1598
1599 pr->pr_parent = ppr;
1600 prison_hold(ppr);
1601 prison_proc_hold(ppr);
1602 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
1603 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
1604 tpr->pr_childcount++;
1605
1606 /* Set some default values, and inherit some from the parent. */
1607 if (namelc == NULL)
1608 namelc = "";
1609 if (path == NULL) {
1610 path = "/";
1611 root = mypr->pr_root;
1612 vref(root);
1613 }
1614 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
1615 pr->pr_flags |= PR_HOST;
1616#if defined(INET) || defined(INET6)
1617#ifdef VIMAGE
1618 if (!(pr_flags & PR_VNET))
1619#endif
1620 {
1621#ifdef INET
1622 if (!(ch_flags & PR_IP4_USER))
1623 pr->pr_flags |= PR_IP4 | PR_IP4_USER;
1624 else if (!(pr_flags & PR_IP4_USER)) {
1625 pr->pr_flags |= ppr->pr_flags & PR_IP4;
1626 prison_ip_dup(ppr, pr, PR_INET);
1627 }
1628#endif
1629#ifdef INET6
1630 if (!(ch_flags & PR_IP6_USER))
1631 pr->pr_flags |= PR_IP6 | PR_IP6_USER;
1632 else if (!(pr_flags & PR_IP6_USER)) {
1633 pr->pr_flags |= ppr->pr_flags & PR_IP6;
1634 prison_ip_dup(ppr, pr, PR_INET6);
1635 }
1636#endif
1637 }
1638#endif
1639 /* Source address selection is always on by default. */
1640 pr->pr_flags |= _PR_IP_SADDRSEL;
1641
1642 pr->pr_securelevel = ppr->pr_securelevel;
1643 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
1644 pr->pr_enforce_statfs = jail_default_enforce_statfs;
1645 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
1646
1647 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
1648 if (osrelstr == NULL)
1649 strlcpy(pr->pr_osrelease, ppr->pr_osrelease,
1650 sizeof(pr->pr_osrelease));
1651 else
1652 strlcpy(pr->pr_osrelease, osrelstr,
1653 sizeof(pr->pr_osrelease));
1654
1655#ifdef VIMAGE
1656 /* Allocate a new vnet if specified. */
1657 pr->pr_vnet = (pr_flags & PR_VNET)
1658 ? vnet_alloc() : ppr->pr_vnet;
1659#endif
1660 /*
1661 * Allocate a dedicated cpuset for each jail.
1662 * Unlike other initial settings, this may return an error.
1663 */
1664 error = cpuset_create_root(ppr, &pr->pr_cpuset);
1665 if (error)
1666 goto done_deref;
1667
1668 mtx_lock(&pr->pr_mtx);
1669 drflags |= PD_LOCKED;
1670 } else {
1671 /*
1672 * Grab a reference for existing prisons, to ensure they
1673 * continue to exist for the duration of the call.
1674 */
1675 prison_hold(pr);
1676 drflags |= PD_DEREF;
1677#if defined(VIMAGE) && (defined(INET) || defined(INET6))
1678 if ((pr->pr_flags & PR_VNET) &&
1679 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
1680 error = EINVAL;
1681 vfs_opterror(opts,
1682 "vnet jails cannot have IP address restrictions");
1683 goto done_deref;
1684 }
1685#endif
1686#ifdef INET
1687 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1688 error = EINVAL;
1689 vfs_opterror(opts,
1690 "ip4 cannot be changed after creation");
1691 goto done_deref;
1692 }
1693#endif
1694#ifdef INET6
1695 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
1696 error = EINVAL;
1697 vfs_opterror(opts,
1698 "ip6 cannot be changed after creation");
1699 goto done_deref;
1700 }
1701#endif
1702 }
1703
1704 /* Do final error checking before setting anything. */
1705 if (gotslevel) {
1706 if (slevel < ppr->pr_securelevel) {
1707 error = EPERM;
1708 goto done_deref;
1709 }
1710 }
1711 if (gotchildmax) {
1712 if (childmax >= ppr->pr_childmax) {
1713 error = EPERM;
1714 goto done_deref;
1715 }
1716 }
1717 if (gotenforce) {
1718 if (enforce < ppr->pr_enforce_statfs) {
1719 error = EPERM;
1720 goto done_deref;
1721 }
1722 }
1723 if (gotrsnum) {
1724 /*
1725 * devfs_rsnum is a uint16_t
1726 */
1727 if (rsnum < 0 || rsnum > 65535) {
1728 error = EINVAL;
1729 goto done_deref;
1730 }
1731 /*
1732 * Nested jails always inherit parent's devfs ruleset
1733 */
1734 if (jailed(td->td_ucred)) {
1735 if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
1736 error = EPERM;
1737 goto done_deref;
1738 } else
1739 rsnum = ppr->pr_devfs_rsnum;
1740 }
1741 }
1742#ifdef INET
1743 if (ip4s > 0) {
1744 if ((ppr->pr_flags & PR_IP4) &&
1745 !prison_ip_parent_match(ppr->pr_addrs[PR_INET], ip4,
1746 PR_INET)) {
1747 error = EPERM;
1748 goto done_deref;
1749 }
1750 if (!prison_ip_conflict_check(ppr, pr, ip4, PR_INET)) {
1751 error = EADDRINUSE;
1752 vfs_opterror(opts, "IPv4 addresses clash");
1753 goto done_deref;
1754 }
1755 }
1756#endif
1757#ifdef INET6
1758 if (ip6s > 0) {
1759 if ((ppr->pr_flags & PR_IP6) &&
1760 !prison_ip_parent_match(ppr->pr_addrs[PR_INET6], ip6,
1761 PR_INET6)) {
1762 error = EPERM;
1763 goto done_deref;
1764 }
1765 if (!prison_ip_conflict_check(ppr, pr, ip6, PR_INET6)) {
1766 error = EADDRINUSE;
1767 vfs_opterror(opts, "IPv6 addresses clash");
1768 goto done_deref;
1769 }
1770 }
1771#endif
1772 onamelen = namelen = 0;
1773 if (namelc != NULL) {
1774 /* Give a default name of the jid. Also allow the name to be
1775 * explicitly the jid - but not any other number, and only in
1776 * normal form (no leading zero/etc).
1777 */
1778 if (namelc[0] == '\0')
1779 snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
1780 else if ((strtoul(namelc, &p, 10) != jid ||
1781 namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
1782 error = EINVAL;
1783 vfs_opterror(opts,
1784 "name cannot be numeric (unless it is the jid)");
1785 goto done_deref;
1786 }
1787 /*
1788 * Make sure the name isn't too long for the prison or its
1789 * children.
1790 */
1791 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
1792 onamelen = strlen(pr->pr_name + pnamelen);
1793 namelen = strlen(namelc);
1794 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
1795 error = ENAMETOOLONG;
1796 goto done_deref;
1797 }
1798 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
1799 if (strlen(tpr->pr_name) + (namelen - onamelen) >=
1800 sizeof(pr->pr_name)) {
1801 error = ENAMETOOLONG;
1802 goto done_deref;
1803 }
1804 }
1805 }
1806 pr_allow_diff = pr_allow & ~ppr->pr_allow;
1807 if (pr_allow_diff & ~PR_ALLOW_DIFFERENCES) {
1808 error = EPERM;
1809 goto done_deref;
1810 }
1811
1812 /*
1813 * Let modules check their parameters. This requires unlocking and
1814 * then re-locking the prison, but this is still a valid state as long
1815 * as allprison_lock remains xlocked.
1816 */
1817 mtx_unlock(&pr->pr_mtx);
1818 drflags &= ~PD_LOCKED;
1819 error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
1820 if (error != 0)
1821 goto done_deref;
1822 mtx_lock(&pr->pr_mtx);
1823 drflags |= PD_LOCKED;
1824
1825 /* At this point, all valid parameters should have been noted. */
1826 TAILQ_FOREACH(opt, opts, link) {
1827 if (!opt->seen && strcmp(opt->name, "errmsg")) {
1828 error = EINVAL;
1829 vfs_opterror(opts, "unknown parameter: %s", opt->name);
1830 goto done_deref;
1831 }
1832 }
1833
1834 /* Set the parameters of the prison. */
1835#ifdef INET
1836 redo_ip4 = 0;
1837 if (pr_flags & PR_IP4_USER) {
1838 pr->pr_flags |= PR_IP4;
1839 prison_ip_set(pr, PR_INET, ip4);
1840 ip4 = NULL;
1841 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1842#ifdef VIMAGE
1843 if (tpr->pr_flags & PR_VNET) {
1844 descend = 0;
1845 continue;
1846 }
1847#endif
1848 if (prison_ip_restrict(tpr, PR_INET, NULL)) {
1849 redo_ip4 = 1;
1850 descend = 0;
1851 }
1852 }
1853 }
1854#endif
1855#ifdef INET6
1856 redo_ip6 = 0;
1857 if (pr_flags & PR_IP6_USER) {
1858 pr->pr_flags |= PR_IP6;
1859 prison_ip_set(pr, PR_INET6, ip6);
1860 ip6 = NULL;
1861 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1862#ifdef VIMAGE
1863 if (tpr->pr_flags & PR_VNET) {
1864 descend = 0;
1865 continue;
1866 }
1867#endif
1868 if (prison_ip_restrict(tpr, PR_INET6, NULL)) {
1869 redo_ip6 = 1;
1870 descend = 0;
1871 }
1872 }
1873 }
1874#endif
1875 if (gotslevel) {
1876 pr->pr_securelevel = slevel;
1877 /* Set all child jails to be at least this level. */
1878 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1879 if (tpr->pr_securelevel < slevel)
1880 tpr->pr_securelevel = slevel;
1881 }
1882 if (gotchildmax) {
1883 pr->pr_childmax = childmax;
1884 /* Set all child jails to under this limit. */
1885 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
1886 if (tpr->pr_childmax > childmax - level)
1887 tpr->pr_childmax = childmax > level
1888 ? childmax - level : 0;
1889 }
1890 if (gotenforce) {
1891 pr->pr_enforce_statfs = enforce;
1892 /* Pass this restriction on to the children. */
1893 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1894 if (tpr->pr_enforce_statfs < enforce)
1895 tpr->pr_enforce_statfs = enforce;
1896 }
1897 if (gotrsnum) {
1898 pr->pr_devfs_rsnum = rsnum;
1899 /* Pass this restriction on to the children. */
1900 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
1901 tpr->pr_devfs_rsnum = rsnum;
1902 }
1903 if (namelc != NULL) {
1904 if (ppr == &prison0)
1905 strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
1906 else
1907 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
1908 ppr->pr_name, namelc);
1909 /* Change this component of child names. */
1910 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1911 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
1912 strlen(tpr->pr_name + onamelen) + 1);
1913 bcopy(pr->pr_name, tpr->pr_name, namelen);
1914 }
1915 }
1916 if (path != NULL) {
1917 /* Try to keep a real-rooted full pathname. */
1918 strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
1919 pr->pr_root = root;
1920 root = NULL;
1921 }
1922 if (PR_HOST & ch_flags & ~pr_flags) {
1923 if (pr->pr_flags & PR_HOST) {
1924 /*
1925 * Copy the parent's host info. As with pr_ip4 above,
1926 * the lack of a lock on the parent is not a problem;
1927 * it is always set with allprison_lock at least
1928 * shared, and is held exclusively here.
1929 */
1930 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
1931 sizeof(pr->pr_hostname));
1932 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
1933 sizeof(pr->pr_domainname));
1934 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
1935 sizeof(pr->pr_hostuuid));
1936 pr->pr_hostid = pr->pr_parent->pr_hostid;
1937 }
1938 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
1939 /* Set this prison, and any descendants without PR_HOST. */
1940 if (host != NULL)
1941 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
1942 if (domain != NULL)
1943 strlcpy(pr->pr_domainname, domain,
1944 sizeof(pr->pr_domainname));
1945 if (uuid != NULL)
1946 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
1947 if (gothid)
1948 pr->pr_hostid = hid;
1949 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
1950 if (tpr->pr_flags & PR_HOST)
1951 descend = 0;
1952 else {
1953 if (host != NULL)
1954 strlcpy(tpr->pr_hostname,
1955 pr->pr_hostname,
1956 sizeof(tpr->pr_hostname));
1957 if (domain != NULL)
1958 strlcpy(tpr->pr_domainname,
1959 pr->pr_domainname,
1960 sizeof(tpr->pr_domainname));
1961 if (uuid != NULL)
1962 strlcpy(tpr->pr_hostuuid,
1963 pr->pr_hostuuid,
1964 sizeof(tpr->pr_hostuuid));
1965 if (gothid)
1966 tpr->pr_hostid = hid;
1967 }
1968 }
1969 }
1970 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
1971 if ((tallow = ch_allow & ~pr_allow))
1972 prison_set_allow_locked(pr, tallow, 0);
1973 /*
1974 * Persistent prisons get an extra reference, and prisons losing their
1975 * persist flag lose that reference.
1976 */
1977 born = !prison_isalive(pr);
1978 if (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags)) {
1979 if (pr_flags & PR_PERSIST) {
1980 prison_hold(pr);
1981 /*
1982 * This may make a dead prison alive again, but wait
1983 * to label it as such until after OSD calls have had
1984 * a chance to run (and perhaps to fail).
1985 */
1986 refcount_acquire(&pr->pr_uref);
1987 } else {
1988 drflags |= PD_DEUREF;
1989 prison_free_not_last(pr);
1990 }
1991 }
1992 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
1993 mtx_unlock(&pr->pr_mtx);
1994 drflags &= ~PD_LOCKED;
1995 /*
1996 * Any errors past this point will need to de-persist newly created
1997 * prisons, as well as call remove methods.
1998 */
1999 if (born)
2000 drflags |= PD_KILL;
2001
2002#ifdef RACCT
2003 if (racct_enable && created)
2004 prison_racct_attach(pr);
2005#endif
2006
2007 /* Locks may have prevented a complete restriction of child IP
2008 * addresses. If so, allocate some more memory and try again.
2009 */
2010#ifdef INET
2011 while (redo_ip4) {
2012 ip4s = pr->pr_addrs[PR_INET]->ips;
2013 ip4 = prison_ip_alloc(PR_INET, ip4s, M_WAITOK);
2014 mtx_lock(&pr->pr_mtx);
2015 redo_ip4 = 0;
2016 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2017#ifdef VIMAGE
2018 if (tpr->pr_flags & PR_VNET) {
2019 descend = 0;
2020 continue;
2021 }
2022#endif
2023 if (prison_ip_restrict(tpr, PR_INET, ip4)) {
2024 if (ip4 != NULL)
2025 ip4 = NULL;
2026 else
2027 redo_ip4 = 1;
2028 }
2029 }
2030 mtx_unlock(&pr->pr_mtx);
2031 }
2032#endif
2033#ifdef INET6
2034 while (redo_ip6) {
2035 ip6s = pr->pr_addrs[PR_INET6]->ips;
2036 ip6 = prison_ip_alloc(PR_INET6, ip6s, M_WAITOK);
2037 mtx_lock(&pr->pr_mtx);
2038 redo_ip6 = 0;
2039 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
2040#ifdef VIMAGE
2041 if (tpr->pr_flags & PR_VNET) {
2042 descend = 0;
2043 continue;
2044 }
2045#endif
2046 if (prison_ip_restrict(tpr, PR_INET6, ip6)) {
2047 if (ip6 != NULL)
2048 ip6 = NULL;
2049 else
2050 redo_ip6 = 1;
2051 }
2052 }
2053 mtx_unlock(&pr->pr_mtx);
2054 }
2055#endif
2056
2057 /* Let the modules do their work. */
2058 if (born) {
2059 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
2060 if (error)
2061 goto done_deref;
2062 }
2063 error = osd_jail_call(pr, PR_METHOD_SET, opts);
2064 if (error)
2065 goto done_deref;
2066
2067 /*
2068 * A new prison is now ready to be seen; either it has gained a user
2069 * reference via persistence, or is about to gain one via attachment.
2070 */
2071 if (born) {
2072 drflags = prison_lock_xlock(pr, drflags);
2073 pr->pr_state = PRISON_STATE_ALIVE;
2074 }
2075
2076 /* Attach this process to the prison if requested. */
2077 if (flags & JAIL_ATTACH) {
2078 error = do_jail_attach(td, pr,
2079 prison_lock_xlock(pr, drflags & PD_LOCK_FLAGS));
2080 drflags &= ~(PD_LOCKED | PD_LIST_XLOCKED);
2081 if (error) {
2082 vfs_opterror(opts, "attach failed");
2083 goto done_deref;
2084 }
2085 }
2086
2087#ifdef RACCT
2088 if (racct_enable && !created) {
2089 if (drflags & PD_LOCKED) {
2090 mtx_unlock(&pr->pr_mtx);
2091 drflags &= ~PD_LOCKED;
2092 }
2093 if (drflags & PD_LIST_XLOCKED) {
2094 sx_xunlock(&allprison_lock);
2095 drflags &= ~PD_LIST_XLOCKED;
2096 }
2097 prison_racct_modify(pr);
2098 }
2099#endif
2100
2101 drflags &= ~PD_KILL;
2102 td->td_retval[0] = pr->pr_id;
2103
2104 done_deref:
2105 /* Release any temporary prison holds and/or locks. */
2106 if (pr != NULL)
2107 prison_deref(pr, drflags);
2108 else if (drflags & PD_LIST_SLOCKED)
2109 sx_sunlock(&allprison_lock);
2110 else if (drflags & PD_LIST_XLOCKED)
2111 sx_xunlock(&allprison_lock);
2112 if (root != NULL)
2113 vrele(root);
2114 done_errmsg:
2115 if (error) {
2116 /* Write the error message back to userspace. */
2117 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
2118 &errmsg_len) == 0 && errmsg_len > 0) {
2119 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
2120 if (optuio->uio_segflg == UIO_SYSSPACE)
2121 bcopy(errmsg,
2122 optuio->uio_iov[errmsg_pos].iov_base,
2123 errmsg_len);
2124 else
2125 copyout(errmsg,
2126 optuio->uio_iov[errmsg_pos].iov_base,
2127 errmsg_len);
2128 }
2129 }
2130 done_free:
2131#ifdef INET
2132 prison_ip_free(ip4);
2133#endif
2134#ifdef INET6
2135 prison_ip_free(ip6);
2136#endif
2137 if (g_path != NULL)
2138 free(g_path, M_TEMP);
2139 vfs_freeopts(opts);
2140 return (error);
2141}
2142
2143/*
2144 * Find the next available prison ID. Return the ID on success, or zero
2145 * on failure. Also set a pointer to the allprison list entry the prison
2146 * should be inserted before.
2147 */
2148static int
2149get_next_prid(struct prison **insprp)
2150{
2151 struct prison *inspr;
2152 int jid, maxid;
2153
2154 jid = lastprid % JAIL_MAX + 1;
2155 if (TAILQ_EMPTY(&allprison) ||
2156 TAILQ_LAST(&allprison, prisonlist)->pr_id < jid) {
2157 /*
2158 * A common case is for all jails to be implicitly numbered,
2159 * which means they'll go on the end of the list, at least
2160 * for the first JAIL_MAX times.
2161 */
2162 inspr = NULL;
2163 } else {
2164 /*
2165 * Take two passes through the allprison list: first starting
2166 * with the proposed jid, then ending with it.
2167 */
2168 for (maxid = JAIL_MAX; maxid != 0; ) {
2169 TAILQ_FOREACH(inspr, &allprison, pr_list) {
2170 if (inspr->pr_id < jid)
2171 continue;
2172 if (inspr->pr_id > jid) {
2173 /* Found an opening. */
2174 maxid = 0;
2175 break;
2176 }
2177 if (++jid > maxid) {
2178 if (lastprid == maxid || lastprid == 0)
2179 {
2180 /*
2181 * The entire legal range
2182 * has been traversed
2183 */
2184 return 0;
2185 }
2186 /* Try again from the start. */
2187 jid = 1;
2188 maxid = lastprid;
2189 break;
2190 }
2191 }
2192 if (inspr == NULL) {
2193 /* Found room at the end of the list. */
2194 break;
2195 }
2196 }
2197 }
2198 *insprp = inspr;
2199 lastprid = jid;
2200 return (jid);
2201}
2202
2203/*
2204 * struct jail_get_args {
2205 * struct iovec *iovp;
2206 * unsigned int iovcnt;
2207 * int flags;
2208 * };
2209 */
2210int
2211sys_jail_get(struct thread *td, struct jail_get_args *uap)
2212{
2213 struct uio *auio;
2214 int error;
2215
2216 /* Check that we have an even number of iovecs. */
2217 if (uap->iovcnt & 1)
2218 return (EINVAL);
2219
2220 error = copyinuio(uap->iovp, uap->iovcnt, &auio);
2221 if (error)
2222 return (error);
2223 error = kern_jail_get(td, auio, uap->flags);
2224 if (error == 0)
2225 error = copyout(auio->uio_iov, uap->iovp,
2226 uap->iovcnt * sizeof (struct iovec));
2227 free(auio, M_IOV);
2228 return (error);
2229}
2230
2231int
2232kern_jail_get(struct thread *td, struct uio *optuio, int flags)
2233{
2234 struct bool_flags *bf;
2235 struct jailsys_flags *jsf;
2236 struct prison *pr, *mypr;
2237 struct vfsopt *opt;
2238 struct vfsoptlist *opts;
2239 char *errmsg, *name;
2240 int drflags, error, errmsg_len, errmsg_pos, i, jid, len, pos;
2241 unsigned f;
2242
2243 if (flags & ~JAIL_GET_MASK)
2244 return (EINVAL);
2245
2246 /* Get the parameter list. */
2247 error = vfs_buildopts(optuio, &opts);
2248 if (error)
2249 return (error);
2250 errmsg_pos = vfs_getopt_pos(opts, "errmsg");
2251 mypr = td->td_ucred->cr_prison;
2252 pr = NULL;
2253
2254 /*
2255 * Find the prison specified by one of: lastjid, jid, name.
2256 */
2257 sx_slock(&allprison_lock);
2258 drflags = PD_LIST_SLOCKED;
2259 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
2260 if (error == 0) {
2261 TAILQ_FOREACH(pr, &allprison, pr_list) {
2262 if (pr->pr_id > jid &&
2263 ((flags & JAIL_DYING) || prison_isalive(pr)) &&
2264 prison_ischild(mypr, pr)) {
2265 mtx_lock(&pr->pr_mtx);
2266 drflags |= PD_LOCKED;
2267 goto found_prison;
2268 }
2269 }
2270 error = ENOENT;
2271 vfs_opterror(opts, "no jail after %d", jid);
2272 goto done;
2273 } else if (error != ENOENT)
2274 goto done;
2275
2276 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
2277 if (error == 0) {
2278 if (jid != 0) {
2279 pr = prison_find_child(mypr, jid);
2280 if (pr != NULL) {
2281 drflags |= PD_LOCKED;
2282 if (!(prison_isalive(pr) ||
2283 (flags & JAIL_DYING))) {
2284 error = ENOENT;
2285 vfs_opterror(opts, "jail %d is dying",
2286 jid);
2287 goto done;
2288 }
2289 goto found_prison;
2290 }
2291 error = ENOENT;
2292 vfs_opterror(opts, "jail %d not found", jid);
2293 goto done;
2294 }
2295 } else if (error != ENOENT)
2296 goto done;
2297
2298 error = vfs_getopt(opts, "name", (void **)&name, &len);
2299 if (error == 0) {
2300 if (len == 0 || name[len - 1] != '\0') {
2301 error = EINVAL;
2302 goto done;
2303 }
2304 pr = prison_find_name(mypr, name);
2305 if (pr != NULL) {
2306 drflags |= PD_LOCKED;
2307 if (!(prison_isalive(pr) || (flags & JAIL_DYING))) {
2308 error = ENOENT;
2309 vfs_opterror(opts, "jail \"%s\" is dying",
2310 name);
2311 goto done;
2312 }
2313 goto found_prison;
2314 }
2315 error = ENOENT;
2316 vfs_opterror(opts, "jail \"%s\" not found", name);
2317 goto done;
2318 } else if (error != ENOENT)
2319 goto done;
2320
2321 vfs_opterror(opts, "no jail specified");
2322 error = ENOENT;
2323 goto done;
2324
2325 found_prison:
2326 /* Get the parameters of the prison. */
2327 prison_hold(pr);
2328 drflags |= PD_DEREF;
2329 td->td_retval[0] = pr->pr_id;
2330 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
2331 if (error != 0 && error != ENOENT)
2332 goto done;
2333 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
2334 error = vfs_setopt(opts, "parent", &i, sizeof(i));
2335 if (error != 0 && error != ENOENT)
2336 goto done;
2337 error = vfs_setopts(opts, "name", prison_name(mypr, pr));
2338 if (error != 0 && error != ENOENT)
2339 goto done;
2340 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
2341 sizeof(pr->pr_cpuset->cs_id));
2342 if (error != 0 && error != ENOENT)
2343 goto done;
2344 error = vfs_setopts(opts, "path", prison_path(mypr, pr));
2345 if (error != 0 && error != ENOENT)
2346 goto done;
2347#ifdef INET
2348 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_addrs[PR_INET] + 1,
2349 pr->pr_addrs[PR_INET] ? pr->pr_addrs[PR_INET]->ips *
2350 pr_families[PR_INET].size : 0 );
2351 if (error != 0 && error != ENOENT)
2352 goto done;
2353#endif
2354#ifdef INET6
2355 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_addrs[PR_INET6] + 1,
2356 pr->pr_addrs[PR_INET6] ? pr->pr_addrs[PR_INET6]->ips *
2357 pr_families[PR_INET6].size : 0 );
2358 if (error != 0 && error != ENOENT)
2359 goto done;
2360#endif
2361 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
2362 sizeof(pr->pr_securelevel));
2363 if (error != 0 && error != ENOENT)
2364 goto done;
2365 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
2366 sizeof(pr->pr_childcount));
2367 if (error != 0 && error != ENOENT)
2368 goto done;
2369 error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
2370 sizeof(pr->pr_childmax));
2371 if (error != 0 && error != ENOENT)
2372 goto done;
2373 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
2374 if (error != 0 && error != ENOENT)
2375 goto done;
2376 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
2377 if (error != 0 && error != ENOENT)
2378 goto done;
2379 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
2380 if (error != 0 && error != ENOENT)
2381 goto done;
2382#ifdef COMPAT_FREEBSD32
2383 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
2384 uint32_t hid32 = pr->pr_hostid;
2385
2386 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
2387 } else
2388#endif
2389 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
2390 sizeof(pr->pr_hostid));
2391 if (error != 0 && error != ENOENT)
2392 goto done;
2393 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
2394 sizeof(pr->pr_enforce_statfs));
2395 if (error != 0 && error != ENOENT)
2396 goto done;
2397 error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
2398 sizeof(pr->pr_devfs_rsnum));
2399 if (error != 0 && error != ENOENT)
2400 goto done;
2401 for (bf = pr_flag_bool;
2402 bf < pr_flag_bool + nitems(pr_flag_bool);
2403 bf++) {
2404 i = (pr->pr_flags & bf->flag) ? 1 : 0;
2405 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2406 if (error != 0 && error != ENOENT)
2407 goto done;
2408 i = !i;
2409 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2410 if (error != 0 && error != ENOENT)
2411 goto done;
2412 }
2413 for (jsf = pr_flag_jailsys;
2414 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
2415 jsf++) {
2416 f = pr->pr_flags & (jsf->disable | jsf->new);
2417 i = (f != 0 && f == jsf->disable) ? JAIL_SYS_DISABLE
2418 : (f == jsf->new) ? JAIL_SYS_NEW
2419 : JAIL_SYS_INHERIT;
2420 error = vfs_setopt(opts, jsf->name, &i, sizeof(i));
2421 if (error != 0 && error != ENOENT)
2422 goto done;
2423 }
2424 for (bf = pr_flag_allow;
2425 bf < pr_flag_allow + nitems(pr_flag_allow) &&
2426 atomic_load_int(&bf->flag) != 0;
2427 bf++) {
2428 i = (pr->pr_allow & bf->flag) ? 1 : 0;
2429 error = vfs_setopt(opts, bf->name, &i, sizeof(i));
2430 if (error != 0 && error != ENOENT)
2431 goto done;
2432 i = !i;
2433 error = vfs_setopt(opts, bf->noname, &i, sizeof(i));
2434 if (error != 0 && error != ENOENT)
2435 goto done;
2436 }
2437 i = !prison_isalive(pr);
2438 error = vfs_setopt(opts, "dying", &i, sizeof(i));
2439 if (error != 0 && error != ENOENT)
2440 goto done;
2441 i = !i;
2442 error = vfs_setopt(opts, "nodying", &i, sizeof(i));
2443 if (error != 0 && error != ENOENT)
2444 goto done;
2445 error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
2446 sizeof(pr->pr_osreldate));
2447 if (error != 0 && error != ENOENT)
2448 goto done;
2449 error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
2450 if (error != 0 && error != ENOENT)
2451 goto done;
2452
2453 /* Get the module parameters. */
2454 mtx_unlock(&pr->pr_mtx);
2455 drflags &= ~PD_LOCKED;
2456 error = osd_jail_call(pr, PR_METHOD_GET, opts);
2457 if (error)
2458 goto done;
2459 prison_deref(pr, drflags);
2460 pr = NULL;
2461 drflags = 0;
2462
2463 /* By now, all parameters should have been noted. */
2464 TAILQ_FOREACH(opt, opts, link) {
2465 if (!opt->seen && strcmp(opt->name, "errmsg")) {
2466 error = EINVAL;
2467 vfs_opterror(opts, "unknown parameter: %s", opt->name);
2468 goto done;
2469 }
2470 }
2471
2472 /* Write the fetched parameters back to userspace. */
2473 error = 0;
2474 TAILQ_FOREACH(opt, opts, link) {
2475 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
2476 pos = 2 * opt->pos + 1;
2477 optuio->uio_iov[pos].iov_len = opt->len;
2478 if (opt->value != NULL) {
2479 if (optuio->uio_segflg == UIO_SYSSPACE) {
2480 bcopy(opt->value,
2481 optuio->uio_iov[pos].iov_base,
2482 opt->len);
2483 } else {
2484 error = copyout(opt->value,
2485 optuio->uio_iov[pos].iov_base,
2486 opt->len);
2487 if (error)
2488 break;
2489 }
2490 }
2491 }
2492 }
2493
2494 done:
2495 /* Release any temporary prison holds and/or locks. */
2496 if (pr != NULL)
2497 prison_deref(pr, drflags);
2498 else if (drflags & PD_LIST_SLOCKED)
2499 sx_sunlock(&allprison_lock);
2500 if (error && errmsg_pos >= 0) {
2501 /* Write the error message back to userspace. */
2502 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
2503 errmsg_pos = 2 * errmsg_pos + 1;
2504 if (errmsg_len > 0) {
2505 if (optuio->uio_segflg == UIO_SYSSPACE)
2506 bcopy(errmsg,
2507 optuio->uio_iov[errmsg_pos].iov_base,
2508 errmsg_len);
2509 else
2510 copyout(errmsg,
2511 optuio->uio_iov[errmsg_pos].iov_base,
2512 errmsg_len);
2513 }
2514 }
2515 vfs_freeopts(opts);
2516 return (error);
2517}
2518
2519/*
2520 * struct jail_remove_args {
2521 * int jid;
2522 * };
2523 */
2524int
2525sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
2526{
2527 struct prison *pr;
2528 int error;
2529
2530 error = priv_check(td, PRIV_JAIL_REMOVE);
2531 if (error)
2532 return (error);
2533
2534 sx_xlock(&allprison_lock);
2535 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2536 if (pr == NULL) {
2537 sx_xunlock(&allprison_lock);
2538 return (EINVAL);
2539 }
2540 if (!prison_isalive(pr)) {
2541 /* Silently ignore already-dying prisons. */
2542 mtx_unlock(&pr->pr_mtx);
2543 sx_xunlock(&allprison_lock);
2544 return (0);
2545 }
2546 prison_deref(pr, PD_KILL | PD_LOCKED | PD_LIST_XLOCKED);
2547 return (0);
2548}
2549
2550/*
2551 * struct jail_attach_args {
2552 * int jid;
2553 * };
2554 */
2555int
2556sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
2557{
2558 struct prison *pr;
2559 int error;
2560
2561 error = priv_check(td, PRIV_JAIL_ATTACH);
2562 if (error)
2563 return (error);
2564
2565 sx_slock(&allprison_lock);
2566 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
2567 if (pr == NULL) {
2568 sx_sunlock(&allprison_lock);
2569 return (EINVAL);
2570 }
2571
2572 /* Do not allow a process to attach to a prison that is not alive. */
2573 if (!prison_isalive(pr)) {
2574 mtx_unlock(&pr->pr_mtx);
2575 sx_sunlock(&allprison_lock);
2576 return (EINVAL);
2577 }
2578
2579 return (do_jail_attach(td, pr, PD_LOCKED | PD_LIST_SLOCKED));
2580}
2581
2582static int
2583do_jail_attach(struct thread *td, struct prison *pr, int drflags)
2584{
2585 struct proc *p;
2586 struct ucred *newcred, *oldcred;
2587 int error;
2588
2589 mtx_assert(&pr->pr_mtx, MA_OWNED);
2590 sx_assert(&allprison_lock, SX_LOCKED);
2591 drflags &= PD_LOCK_FLAGS;
2592 /*
2593 * XXX: Note that there is a slight race here if two threads
2594 * in the same privileged process attempt to attach to two
2595 * different jails at the same time. It is important for
2596 * user processes not to do this, or they might end up with
2597 * a process root from one prison, but attached to the jail
2598 * of another.
2599 */
2600 prison_hold(pr);
2601 refcount_acquire(&pr->pr_uref);
2602 drflags |= PD_DEREF | PD_DEUREF;
2603 mtx_unlock(&pr->pr_mtx);
2604 drflags &= ~PD_LOCKED;
2605
2606 /* Let modules do whatever they need to prepare for attaching. */
2607 error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
2608 if (error) {
2609 prison_deref(pr, drflags);
2610 return (error);
2611 }
2612 sx_unlock(&allprison_lock);
2613 drflags &= ~(PD_LIST_SLOCKED | PD_LIST_XLOCKED);
2614
2615 /*
2616 * Reparent the newly attached process to this jail.
2617 */
2618 p = td->td_proc;
2619 error = cpuset_setproc_update_set(p, pr->pr_cpuset);
2620 if (error)
2621 goto e_revert_osd;
2622
2623 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
2624 if ((error = change_dir(pr->pr_root, td)) != 0)
2625 goto e_unlock;
2626#ifdef MAC
2627 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
2628 goto e_unlock;
2629#endif
2630 VOP_UNLOCK(pr->pr_root);
2631 if ((error = pwd_chroot_chdir(td, pr->pr_root)))
2632 goto e_revert_osd;
2633
2634 newcred = crget();
2635 PROC_LOCK(p);
2636 oldcred = crcopysafe(p, newcred);
2637 newcred->cr_prison = pr;
2638 proc_set_cred(p, newcred);
2639 setsugid(p);
2640#ifdef RACCT
2641 racct_proc_ucred_changed(p, oldcred, newcred);
2642 crhold(newcred);
2643#endif
2644 PROC_UNLOCK(p);
2645#ifdef RCTL
2646 rctl_proc_ucred_changed(p, newcred);
2647 crfree(newcred);
2648#endif
2649 prison_deref(oldcred->cr_prison, drflags);
2650 crfree(oldcred);
2651
2652 /*
2653 * If the prison was killed while changing credentials, die along
2654 * with it.
2655 */
2656 if (!prison_isalive(pr)) {
2657 PROC_LOCK(p);
2658 kern_psignal(p, SIGKILL);
2659 PROC_UNLOCK(p);
2660 }
2661
2662 return (0);
2663
2664 e_unlock:
2665 VOP_UNLOCK(pr->pr_root);
2666 e_revert_osd:
2667 /* Tell modules this thread is still in its old jail after all. */
2668 sx_slock(&allprison_lock);
2669 drflags |= PD_LIST_SLOCKED;
2670 (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
2671 prison_deref(pr, drflags);
2672 return (error);
2673}
2674
2675/*
2676 * Returns a locked prison instance, or NULL on failure.
2677 */
2678struct prison *
2679prison_find(int prid)
2680{
2681 struct prison *pr;
2682
2683 sx_assert(&allprison_lock, SX_LOCKED);
2684 TAILQ_FOREACH(pr, &allprison, pr_list) {
2685 if (pr->pr_id < prid)
2686 continue;
2687 if (pr->pr_id > prid)
2688 break;
2689 KASSERT(prison_isvalid(pr), ("Found invalid prison %p", pr));
2690 mtx_lock(&pr->pr_mtx);
2691 return (pr);
2692 }
2693 return (NULL);
2694}
2695
2696/*
2697 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL.
2698 */
2699struct prison *
2700prison_find_child(struct prison *mypr, int prid)
2701{
2702 struct prison *pr;
2703 int descend;
2704
2705 sx_assert(&allprison_lock, SX_LOCKED);
2706 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2707 if (pr->pr_id == prid) {
2708 KASSERT(prison_isvalid(pr),
2709 ("Found invalid prison %p", pr));
2710 mtx_lock(&pr->pr_mtx);
2711 return (pr);
2712 }
2713 }
2714 return (NULL);
2715}
2716
2717/*
2718 * Look for the name relative to mypr. Returns a locked prison or NULL.
2719 */
2720struct prison *
2721prison_find_name(struct prison *mypr, const char *name)
2722{
2723 struct prison *pr, *deadpr;
2724 size_t mylen;
2725 int descend;
2726
2727 sx_assert(&allprison_lock, SX_LOCKED);
2728 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
2729 deadpr = NULL;
2730 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
2731 if (!strcmp(pr->pr_name + mylen, name)) {
2732 KASSERT(prison_isvalid(pr),
2733 ("Found invalid prison %p", pr));
2734 if (prison_isalive(pr)) {
2735 mtx_lock(&pr->pr_mtx);
2736 return (pr);
2737 }
2738 deadpr = pr;
2739 }
2740 }
2741 /* There was no valid prison - perhaps there was a dying one. */
2742 if (deadpr != NULL)
2743 mtx_lock(&deadpr->pr_mtx);
2744 return (deadpr);
2745}
2746
2747/*
2748 * See if a prison has the specific flag set. The prison should be locked,
2749 * unless checking for flags that are only set at jail creation (such as
2750 * PR_IP4 and PR_IP6), or only the single bit is examined, without regard
2751 * to any other prison data.
2752 */
2753int
2754prison_flag(struct ucred *cred, unsigned flag)
2755{
2756
2757 return (cred->cr_prison->pr_flags & flag);
2758}
2759
2760int
2761prison_allow(struct ucred *cred, unsigned flag)
2762{
2763
2764 return ((cred->cr_prison->pr_allow & flag) != 0);
2765}
2766
2767/*
2768 * Hold a prison reference, by incrementing pr_ref. It is generally
2769 * an error to hold a prison that does not already have a reference.
2770 * A prison record will remain valid as long as it has at least one
2771 * reference, and will not be removed as long as either the prison
2772 * mutex or the allprison lock is held (allprison_lock may be shared).
2773 */
2774void
2775prison_hold_locked(struct prison *pr)
2776{
2777
2778 /* Locking is no longer required. */
2779 prison_hold(pr);
2780}
2781
2782void
2783prison_hold(struct prison *pr)
2784{
2785#ifdef INVARIANTS
2786 int was_valid = refcount_acquire_if_not_zero(&pr->pr_ref);
2787
2788 KASSERT(was_valid,
2789 ("Trying to hold dead prison %p (jid=%d).", pr, pr->pr_id));
2790#else
2791 refcount_acquire(&pr->pr_ref);
2792#endif
2793}
2794
2795/*
2796 * Remove a prison reference. If that was the last reference, the
2797 * prison will be removed (at a later time).
2798 */
2799void
2800prison_free_locked(struct prison *pr)
2801{
2802
2803 mtx_assert(&pr->pr_mtx, MA_OWNED);
2804 /*
2805 * Locking is no longer required, but unlock because the caller
2806 * expects it.
2807 */
2808 mtx_unlock(&pr->pr_mtx);
2809 prison_free(pr);
2810}
2811
2812void
2813prison_free(struct prison *pr)
2814{
2815
2816 KASSERT(refcount_load(&pr->pr_ref) > 0,
2817 ("Trying to free dead prison %p (jid=%d).",
2818 pr, pr->pr_id));
2819 if (!refcount_release_if_not_last(&pr->pr_ref)) {
2820 /*
2821 * Don't remove the last reference in this context,
2822 * in case there are locks held.
2823 */
2824 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2825 }
2826}
2827
2828static void
2829prison_free_not_last(struct prison *pr)
2830{
2831#ifdef INVARIANTS
2832 int lastref;
2833
2834 KASSERT(refcount_load(&pr->pr_ref) > 0,
2835 ("Trying to free dead prison %p (jid=%d).",
2836 pr, pr->pr_id));
2837 lastref = refcount_release(&pr->pr_ref);
2838 KASSERT(!lastref,
2839 ("prison_free_not_last freed last ref on prison %p (jid=%d).",
2840 pr, pr->pr_id));
2841#else
2842 refcount_release(&pr->pr_ref);
2843#endif
2844}
2845
2846/*
2847 * Hold a a prison for user visibility, by incrementing pr_uref.
2848 * It is generally an error to hold a prison that isn't already
2849 * user-visible, except through the the jail system calls. It is also
2850 * an error to hold an invalid prison. A prison record will remain
2851 * alive as long as it has at least one user reference, and will not
2852 * be set to the dying state until the prison mutex and allprison_lock
2853 * are both freed.
2854 */
2855void
2856prison_proc_hold(struct prison *pr)
2857{
2858#ifdef INVARIANTS
2859 int was_alive = refcount_acquire_if_not_zero(&pr->pr_uref);
2860
2861 KASSERT(was_alive,
2862 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
2863#else
2864 refcount_acquire(&pr->pr_uref);
2865#endif
2866}
2867
2868/*
2869 * Remove a prison user reference. If it was the last reference, the
2870 * prison will be considered "dying", and may be removed once all of
2871 * its references are dropped.
2872 */
2873void
2874prison_proc_free(struct prison *pr)
2875{
2876
2877 /*
2878 * Locking is only required when releasing the last reference.
2879 * This allows assurance that a locked prison will remain alive
2880 * until it is unlocked.
2881 */
2882 KASSERT(refcount_load(&pr->pr_uref) > 0,
2883 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
2884 if (!refcount_release_if_not_last(&pr->pr_uref)) {
2885 /*
2886 * Don't remove the last user reference in this context,
2887 * which is expected to be a process that is not only locked,
2888 * but also half dead. Add a reference so any calls to
2889 * prison_free() won't re-submit the task.
2890 */
2891 prison_hold(pr);
2892 mtx_lock(&pr->pr_mtx);
2893 KASSERT(!(pr->pr_flags & PR_COMPLETE_PROC),
2894 ("Redundant last reference in prison_proc_free (jid=%d)",
2895 pr->pr_id));
2896 pr->pr_flags |= PR_COMPLETE_PROC;
2897 mtx_unlock(&pr->pr_mtx);
2898 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
2899 }
2900}
2901
2902static void
2903prison_proc_free_not_last(struct prison *pr)
2904{
2905#ifdef INVARIANTS
2906 int lastref;
2907
2908 KASSERT(refcount_load(&pr->pr_uref) > 0,
2909 ("Trying to free dead prison %p (jid=%d).",
2910 pr, pr->pr_id));
2911 lastref = refcount_release(&pr->pr_uref);
2912 KASSERT(!lastref,
2913 ("prison_proc_free_not_last freed last uref on prison %p (jid=%d).",
2914 pr, pr->pr_id));
2915#else
2916 refcount_release(&pr->pr_uref);
2917#endif
2918}
2919
2920/*
2921 * Complete a call to either prison_free or prison_proc_free.
2922 */
2923static void
2924prison_complete(void *context, int pending)
2925{
2926 struct prison *pr = context;
2927 int drflags;
2928
2929 /*
2930 * This could be called to release the last reference, or the last
2931 * user reference (plus the reference held in prison_proc_free).
2932 */
2933 drflags = prison_lock_xlock(pr, PD_DEREF);
2934 if (pr->pr_flags & PR_COMPLETE_PROC) {
2935 pr->pr_flags &= ~PR_COMPLETE_PROC;
2936 drflags |= PD_DEUREF;
2937 }
2938 prison_deref(pr, drflags);
2939}
2940
2941/*
2942 * Remove a prison reference and/or user reference (usually).
2943 * This assumes context that allows sleeping (for allprison_lock),
2944 * with no non-sleeping locks held, except perhaps the prison itself.
2945 * If there are no more references, release and delist the prison.
2946 * On completion, the prison lock and the allprison lock are both
2947 * unlocked.
2948 */
2949static void
2950prison_deref(struct prison *pr, int flags)
2951{
2952 struct prisonlist freeprison;
2953 struct prison *killpr, *rpr, *ppr, *tpr;
2954 struct proc *p;
2955
2956 killpr = NULL;
2957 TAILQ_INIT(&freeprison);
2958 /*
2959 * Release this prison as requested, which may cause its parent
2960 * to be released, and then maybe its grandparent, etc.
2961 */
2962 for (;;) {
2963 if (flags & PD_KILL) {
2964 /* Kill the prison and its descendents. */
2965 KASSERT(pr != &prison0,
2966 ("prison_deref trying to kill prison0"));
2967 if (!(flags & PD_DEREF)) {
2968 prison_hold(pr);
2969 flags |= PD_DEREF;
2970 }
2971 flags = prison_lock_xlock(pr, flags);
2972 prison_deref_kill(pr, &freeprison);
2973 }
2974 if (flags & PD_DEUREF) {
2975 /* Drop a user reference. */
2976 KASSERT(refcount_load(&pr->pr_uref) > 0,
2977 ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
2978 pr->pr_id));
2979 if (!refcount_release_if_not_last(&pr->pr_uref)) {
2980 if (!(flags & PD_DEREF)) {
2981 prison_hold(pr);
2982 flags |= PD_DEREF;
2983 }
2984 flags = prison_lock_xlock(pr, flags);
2985 if (refcount_release(&pr->pr_uref) &&
2986 pr->pr_state == PRISON_STATE_ALIVE) {
2987 /*
2988 * When the last user references goes,
2989 * this becomes a dying prison.
2990 */
2991 KASSERT(
2992 refcount_load(&prison0.pr_uref) > 0,
2993 ("prison0 pr_uref=0"));
2994 pr->pr_state = PRISON_STATE_DYING;
2995 mtx_unlock(&pr->pr_mtx);
2996 flags &= ~PD_LOCKED;
2997 (void)osd_jail_call(pr,
2998 PR_METHOD_REMOVE, NULL);
2999 }
3000 }
3001 }
3002 if (flags & PD_KILL) {
3003 /*
3004 * Any remaining user references are probably processes
3005 * that need to be killed, either in this prison or its
3006 * descendants.
3007 */
3008 if (refcount_load(&pr->pr_uref) > 0)
3009 killpr = pr;
3010 /* Make sure the parent prison doesn't get killed. */
3011 flags &= ~PD_KILL;
3012 }
3013 if (flags & PD_DEREF) {
3014 /* Drop a reference. */
3015 KASSERT(refcount_load(&pr->pr_ref) > 0,
3016 ("prison_deref PD_DEREF on a dead prison (jid=%d)",
3017 pr->pr_id));
3018 if (!refcount_release_if_not_last(&pr->pr_ref)) {
3019 flags = prison_lock_xlock(pr, flags);
3020 if (refcount_release(&pr->pr_ref)) {
3021 /*
3022 * When the last reference goes,
3023 * unlink the prison and set it aside.
3024 */
3025 KASSERT(
3026 refcount_load(&pr->pr_uref) == 0,
3027 ("prison_deref: last ref, "
3028 "but still has %d urefs (jid=%d)",
3029 pr->pr_uref, pr->pr_id));
3030 KASSERT(
3031 refcount_load(&prison0.pr_ref) != 0,
3032 ("prison0 pr_ref=0"));
3033 pr->pr_state = PRISON_STATE_INVALID;
3034 TAILQ_REMOVE(&allprison, pr, pr_list);
3035 LIST_REMOVE(pr, pr_sibling);
3036 TAILQ_INSERT_TAIL(&freeprison, pr,
3037 pr_list);
3038 for (ppr = pr->pr_parent;
3039 ppr != NULL;
3040 ppr = ppr->pr_parent)
3041 ppr->pr_childcount--;
3042 /*
3043 * Removing a prison frees references
3044 * from its parent.
3045 */
3046 mtx_unlock(&pr->pr_mtx);
3047 flags &= ~PD_LOCKED;
3048 pr = pr->pr_parent;
3049 flags |= PD_DEREF | PD_DEUREF;
3050 continue;
3051 }
3052 }
3053 }
3054 break;
3055 }
3056
3057 /* Release all the prison locks. */
3058 if (flags & PD_LOCKED)
3059 mtx_unlock(&pr->pr_mtx);
3060 if (flags & PD_LIST_SLOCKED)
3061 sx_sunlock(&allprison_lock);
3062 else if (flags & PD_LIST_XLOCKED)
3063 sx_xunlock(&allprison_lock);
3064
3065 /* Kill any processes attached to a killed prison. */
3066 if (killpr != NULL) {
3067 sx_slock(&allproc_lock);
3068 FOREACH_PROC_IN_SYSTEM(p) {
3069 PROC_LOCK(p);
3070 if (p->p_state != PRS_NEW && p->p_ucred != NULL) {
3071 for (ppr = p->p_ucred->cr_prison;
3072 ppr != &prison0;
3073 ppr = ppr->pr_parent)
3074 if (ppr == killpr) {
3075 kern_psignal(p, SIGKILL);
3076 break;
3077 }
3078 }
3079 PROC_UNLOCK(p);
3080 }
3081 sx_sunlock(&allproc_lock);
3082 }
3083
3084 /*
3085 * Finish removing any unreferenced prisons, which couldn't happen
3086 * while allprison_lock was held (to avoid a LOR on vrele).
3087 */
3088 TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) {
3089#ifdef VIMAGE
3090 if (rpr->pr_vnet != rpr->pr_parent->pr_vnet)
3091 vnet_destroy(rpr->pr_vnet);
3092#endif
3093 if (rpr->pr_root != NULL)
3094 vrele(rpr->pr_root);
3095 mtx_destroy(&rpr->pr_mtx);
3096#ifdef INET
3097 prison_ip_free(rpr->pr_addrs[PR_INET]);
3098#endif
3099#ifdef INET6
3100 prison_ip_free(rpr->pr_addrs[PR_INET6]);
3101#endif
3102 if (rpr->pr_cpuset != NULL)
3103 cpuset_rel(rpr->pr_cpuset);
3104 osd_jail_exit(rpr);
3105#ifdef RACCT
3106 if (racct_enable)
3107 prison_racct_detach(rpr);
3108#endif
3109 TAILQ_REMOVE(&freeprison, rpr, pr_list);
3110 free(rpr, M_PRISON);
3111 }
3112}
3113
3114/*
3115 * Kill the prison and its descendants. Mark them as dying, clear the
3116 * persist flag, and call module remove methods.
3117 */
3118static void
3119prison_deref_kill(struct prison *pr, struct prisonlist *freeprison)
3120{
3121 struct prison *cpr, *ppr, *rpr;
3122 bool descend;
3123
3124 /*
3125 * Unlike the descendants, the target prison can be killed
3126 * even if it is currently dying. This is useful for failed
3127 * creation in jail_set(2).
3128 */
3129 KASSERT(refcount_load(&pr->pr_ref) > 0,
3130 ("Trying to kill dead prison %p (jid=%d).",
3131 pr, pr->pr_id));
3132 refcount_acquire(&pr->pr_uref);
3133 pr->pr_state = PRISON_STATE_DYING;
3134 mtx_unlock(&pr->pr_mtx);
3135
3136 rpr = NULL;
3137 FOREACH_PRISON_DESCENDANT_PRE_POST(pr, cpr, descend) {
3138 if (descend) {
3139 if (!prison_isalive(cpr)) {
3140 descend = false;
3141 continue;
3142 }
3143 prison_hold(cpr);
3144 prison_proc_hold(cpr);
3145 mtx_lock(&cpr->pr_mtx);
3146 cpr->pr_state = PRISON_STATE_DYING;
3147 cpr->pr_flags |= PR_REMOVE;
3148 mtx_unlock(&cpr->pr_mtx);
3149 continue;
3150 }
3151 if (!(cpr->pr_flags & PR_REMOVE))
3152 continue;
3153 (void)osd_jail_call(cpr, PR_METHOD_REMOVE, NULL);
3154 mtx_lock(&cpr->pr_mtx);
3155 cpr->pr_flags &= ~PR_REMOVE;
3156 if (cpr->pr_flags & PR_PERSIST) {
3157 cpr->pr_flags &= ~PR_PERSIST;
3158 prison_proc_free_not_last(cpr);
3159 prison_free_not_last(cpr);
3160 }
3161 (void)refcount_release(&cpr->pr_uref);
3162 if (refcount_release(&cpr->pr_ref)) {
3163 /*
3164 * When the last reference goes, unlink the prison
3165 * and set it aside for prison_deref() to handle.
3166 * Delay unlinking the sibling list to keep the loop
3167 * safe.
3168 */
3169 if (rpr != NULL)
3170 LIST_REMOVE(rpr, pr_sibling);
3171 rpr = cpr;
3172 rpr->pr_state = PRISON_STATE_INVALID;
3173 TAILQ_REMOVE(&allprison, rpr, pr_list);
3174 TAILQ_INSERT_TAIL(freeprison, rpr, pr_list);
3175 /*
3176 * Removing a prison frees references from its parent.
3177 */
3178 ppr = rpr->pr_parent;
3179 prison_proc_free_not_last(ppr);
3180 prison_free_not_last(ppr);
3181 for (; ppr != NULL; ppr = ppr->pr_parent)
3182 ppr->pr_childcount--;
3183 }
3184 mtx_unlock(&cpr->pr_mtx);
3185 }
3186 if (rpr != NULL)
3187 LIST_REMOVE(rpr, pr_sibling);
3188
3189 (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
3190 mtx_lock(&pr->pr_mtx);
3191 if (pr->pr_flags & PR_PERSIST) {
3192 pr->pr_flags &= ~PR_PERSIST;
3193 prison_proc_free_not_last(pr);
3194 prison_free_not_last(pr);
3195 }
3196 (void)refcount_release(&pr->pr_uref);
3197}
3198
3199/*
3200 * Given the current locking state in the flags, make sure allprison_lock
3201 * is held exclusive, and the prison is locked. Return flags indicating
3202 * the new state.
3203 */
3204static int
3205prison_lock_xlock(struct prison *pr, int flags)
3206{
3207
3208 if (!(flags & PD_LIST_XLOCKED)) {
3209 /*
3210 * Get allprison_lock, which may be an upgrade,
3211 * and may require unlocking the prison.
3212 */
3213 if (flags & PD_LOCKED) {
3214 mtx_unlock(&pr->pr_mtx);
3215 flags &= ~PD_LOCKED;
3216 }
3217 if (flags & PD_LIST_SLOCKED) {
3218 if (!sx_try_upgrade(&allprison_lock)) {
3219 sx_sunlock(&allprison_lock);
3220 sx_xlock(&allprison_lock);
3221 }
3222 flags &= ~PD_LIST_SLOCKED;
3223 } else
3224 sx_xlock(&allprison_lock);
3225 flags |= PD_LIST_XLOCKED;
3226 }
3227 if (!(flags & PD_LOCKED)) {
3228 /* Lock the prison mutex. */
3229 mtx_lock(&pr->pr_mtx);
3230 flags |= PD_LOCKED;
3231 }
3232 return flags;
3233}
3234
3235/*
3236 * Set or clear a permission bit in the pr_allow field, passing restrictions
3237 * (cleared permission) down to child jails.
3238 */
3239void
3240prison_set_allow(struct ucred *cred, unsigned flag, int enable)
3241{
3242 struct prison *pr;
3243
3244 pr = cred->cr_prison;
3245 sx_slock(&allprison_lock);
3246 mtx_lock(&pr->pr_mtx);
3247 prison_set_allow_locked(pr, flag, enable);
3248 mtx_unlock(&pr->pr_mtx);
3249 sx_sunlock(&allprison_lock);
3250}
3251
3252static void
3253prison_set_allow_locked(struct prison *pr, unsigned flag, int enable)
3254{
3255 struct prison *cpr;
3256 int descend;
3257
3258 if (enable != 0)
3259 pr->pr_allow |= flag;
3260 else {
3261 pr->pr_allow &= ~flag;
3262 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
3263 cpr->pr_allow &= ~flag;
3264 }
3265}
3266
3267/*
3268 * Check if a jail supports the given address family.
3269 *
3270 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
3271 * if not.
3272 */
3273int
3274prison_check_af(struct ucred *cred, int af)
3275{
3276 struct prison *pr;
3277 int error;
3278
3279 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3280
3281 pr = cred->cr_prison;
3282#ifdef VIMAGE
3283 /* Prisons with their own network stack are not limited. */
3284 if (prison_owns_vnet(cred))
3285 return (0);
3286#endif
3287
3288 error = 0;
3289 switch (af)
3290 {
3291#ifdef INET
3292 case AF_INET:
3293 if (pr->pr_flags & PR_IP4)
3294 {
3295 mtx_lock(&pr->pr_mtx);
3296 if ((pr->pr_flags & PR_IP4) &&
3297 pr->pr_addrs[PR_INET] == NULL)
3298 error = EAFNOSUPPORT;
3299 mtx_unlock(&pr->pr_mtx);
3300 }
3301 break;
3302#endif
3303#ifdef INET6
3304 case AF_INET6:
3305 if (pr->pr_flags & PR_IP6)
3306 {
3307 mtx_lock(&pr->pr_mtx);
3308 if ((pr->pr_flags & PR_IP6) &&
3309 pr->pr_addrs[PR_INET6] == NULL)
3310 error = EAFNOSUPPORT;
3311 mtx_unlock(&pr->pr_mtx);
3312 }
3313 break;
3314#endif
3315 case AF_LOCAL:
3316 case AF_ROUTE:
3317 break;
3318 default:
3319 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
3320 error = EAFNOSUPPORT;
3321 }
3322 return (error);
3323}
3324
3325/*
3326 * Check if given address belongs to the jail referenced by cred (wrapper to
3327 * prison_check_ip[46]).
3328 *
3329 * Returns 0 if jail doesn't restrict the address family or if address belongs
3330 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
3331 * the jail doesn't allow the address family. IPv4 Address passed in in NBO.
3332 */
3333int
3334prison_if(struct ucred *cred, const struct sockaddr *sa)
3335{
3336#ifdef INET
3337 const struct sockaddr_in *sai;
3338#endif
3339#ifdef INET6
3340 const struct sockaddr_in6 *sai6;
3341#endif
3342 int error;
3343
3344 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
3345 KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
3346
3347#ifdef VIMAGE
3348 if (prison_owns_vnet(cred))
3349 return (0);
3350#endif
3351
3352 error = 0;
3353 switch (sa->sa_family)
3354 {
3355#ifdef INET
3356 case AF_INET:
3357 sai = (const struct sockaddr_in *)sa;
3358 error = prison_check_ip4(cred, &sai->sin_addr);
3359 break;
3360#endif
3361#ifdef INET6
3362 case AF_INET6:
3363 sai6 = (const struct sockaddr_in6 *)sa;
3364 error = prison_check_ip6(cred, &sai6->sin6_addr);
3365 break;
3366#endif
3367 default:
3368 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
3369 error = EAFNOSUPPORT;
3370 }
3371 return (error);
3372}
3373
3374/*
3375 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
3376 */
3377int
3378prison_check(struct ucred *cred1, struct ucred *cred2)
3379{
3380
3381 return ((cred1->cr_prison == cred2->cr_prison ||
3382 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
3383}
3384
3385/*
3386 * Return 1 if p2 is a child of p1, otherwise 0.
3387 */
3388int
3389prison_ischild(struct prison *pr1, struct prison *pr2)
3390{
3391
3392 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
3393 if (pr1 == pr2)
3394 return (1);
3395 return (0);
3396}
3397
3398/*
3399 * Return true if the prison is currently alive. A prison is alive if it
3400 * holds user references and it isn't being removed.
3401 */
3402bool
3403prison_isalive(const struct prison *pr)
3404{
3405
3406 if (__predict_false(pr->pr_state != PRISON_STATE_ALIVE))
3407 return (false);
3408 return (true);
3409}
3410
3411/*
3412 * Return true if the prison is currently valid. A prison is valid if it has
3413 * been fully created, and is not being destroyed. Note that dying prisons
3414 * are still considered valid. Invalid prisons won't be found under normal
3415 * circumstances, as they're only put in that state by functions that have
3416 * an exclusive hold on allprison_lock.
3417 */
3418bool
3419prison_isvalid(struct prison *pr)
3420{
3421
3422 if (__predict_false(pr->pr_state == PRISON_STATE_INVALID))
3423 return (false);
3424 if (__predict_false(refcount_load(&pr->pr_ref) == 0))
3425 return (false);
3426 return (true);
3427}
3428
3429/*
3430 * Return 1 if the passed credential is in a jail and that jail does not
3431 * have its own virtual network stack, otherwise 0.
3432 */
3433int
3434jailed_without_vnet(struct ucred *cred)
3435{
3436
3437 if (!jailed(cred))
3438 return (0);
3439#ifdef VIMAGE
3440 if (prison_owns_vnet(cred))
3441 return (0);
3442#endif
3443
3444 return (1);
3445}
3446
3447/*
3448 * Return the correct hostname (domainname, et al) for the passed credential.
3449 */
3450void
3451getcredhostname(struct ucred *cred, char *buf, size_t size)
3452{
3453 struct prison *pr;
3454
3455 /*
3456 * A NULL credential can be used to shortcut to the physical
3457 * system's hostname.
3458 */
3459 pr = (cred != NULL) ? cred->cr_prison : &prison0;
3460 mtx_lock(&pr->pr_mtx);
3461 strlcpy(buf, pr->pr_hostname, size);
3462 mtx_unlock(&pr->pr_mtx);
3463}
3464
3465void
3466getcreddomainname(struct ucred *cred, char *buf, size_t size)
3467{
3468
3469 mtx_lock(&cred->cr_prison->pr_mtx);
3470 strlcpy(buf, cred->cr_prison->pr_domainname, size);
3471 mtx_unlock(&cred->cr_prison->pr_mtx);
3472}
3473
3474void
3475getcredhostuuid(struct ucred *cred, char *buf, size_t size)
3476{
3477
3478 mtx_lock(&cred->cr_prison->pr_mtx);
3479 strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
3480 mtx_unlock(&cred->cr_prison->pr_mtx);
3481}
3482
3483void
3484getcredhostid(struct ucred *cred, unsigned long *hostid)
3485{
3486
3487 mtx_lock(&cred->cr_prison->pr_mtx);
3488 *hostid = cred->cr_prison->pr_hostid;
3489 mtx_unlock(&cred->cr_prison->pr_mtx);
3490}
3491
3492void
3493getjailname(struct ucred *cred, char *name, size_t len)
3494{
3495
3496 mtx_lock(&cred->cr_prison->pr_mtx);
3497 strlcpy(name, cred->cr_prison->pr_name, len);
3498 mtx_unlock(&cred->cr_prison->pr_mtx);
3499}
3500
3501#ifdef VIMAGE
3502/*
3503 * Determine whether the prison represented by cred owns
3504 * its vnet rather than having it inherited.
3505 *
3506 * Returns 1 in case the prison owns the vnet, 0 otherwise.
3507 */
3508int
3509prison_owns_vnet(struct ucred *cred)
3510{
3511
3512 /*
3513 * vnets cannot be added/removed after jail creation,
3514 * so no need to lock here.
3515 */
3516 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
3517}
3518#endif
3519
3520/*
3521 * Determine whether the subject represented by cred can "see"
3522 * status of a mount point.
3523 * Returns: 0 for permitted, ENOENT otherwise.
3524 * XXX: This function should be called cr_canseemount() and should be
3525 * placed in kern_prot.c.
3526 */
3527int
3528prison_canseemount(struct ucred *cred, struct mount *mp)
3529{
3530 struct prison *pr;
3531 struct statfs *sp;
3532 size_t len;
3533
3534 pr = cred->cr_prison;
3535 if (pr->pr_enforce_statfs == 0)
3536 return (0);
3537 if (pr->pr_root->v_mount == mp)
3538 return (0);
3539 if (pr->pr_enforce_statfs == 2)
3540 return (ENOENT);
3541 /*
3542 * If jail's chroot directory is set to "/" we should be able to see
3543 * all mount-points from inside a jail.
3544 * This is ugly check, but this is the only situation when jail's
3545 * directory ends with '/'.
3546 */
3547 if (strcmp(pr->pr_path, "/") == 0)
3548 return (0);
3549 len = strlen(pr->pr_path);
3550 sp = &mp->mnt_stat;
3551 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
3552 return (ENOENT);
3553 /*
3554 * Be sure that we don't have situation where jail's root directory
3555 * is "/some/path" and mount point is "/some/pathpath".
3556 */
3557 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
3558 return (ENOENT);
3559 return (0);
3560}
3561
3562void
3563prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
3564{
3565 char jpath[MAXPATHLEN];
3566 struct prison *pr;
3567 size_t len;
3568
3569 pr = cred->cr_prison;
3570 if (pr->pr_enforce_statfs == 0)
3571 return;
3572 if (prison_canseemount(cred, mp) != 0) {
3573 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3574 strlcpy(sp->f_mntonname, "[restricted]",
3575 sizeof(sp->f_mntonname));
3576 return;
3577 }
3578 if (pr->pr_root->v_mount == mp) {
3579 /*
3580 * Clear current buffer data, so we are sure nothing from
3581 * the valid path left there.
3582 */
3583 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3584 *sp->f_mntonname = '/';
3585 return;
3586 }
3587 /*
3588 * If jail's chroot directory is set to "/" we should be able to see
3589 * all mount-points from inside a jail.
3590 */
3591 if (strcmp(pr->pr_path, "/") == 0)
3592 return;
3593 len = strlen(pr->pr_path);
3594 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
3595 /*
3596 * Clear current buffer data, so we are sure nothing from
3597 * the valid path left there.
3598 */
3599 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3600 if (*jpath == '\0') {
3601 /* Should never happen. */
3602 *sp->f_mntonname = '/';
3603 } else {
3604 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
3605 }
3606}
3607
3608/*
3609 * Check with permission for a specific privilege is granted within jail. We
3610 * have a specific list of accepted privileges; the rest are denied.
3611 */
3612int
3613prison_priv_check(struct ucred *cred, int priv)
3614{
3615 struct prison *pr;
3616 int error;
3617
3618 /*
3619 * Some policies have custom handlers. This routine should not be
3620 * called for them. See priv_check_cred().
3621 */
3622 switch (priv) {
3623 case PRIV_VFS_LOOKUP:
3624 case PRIV_VFS_GENERATION:
3625 KASSERT(0, ("prison_priv_check instead of a custom handler "
3626 "called for %d\n", priv));
3627 }
3628
3629 if (!jailed(cred))
3630 return (0);
3631
3632#ifdef VIMAGE
3633 /*
3634 * Privileges specific to prisons with a virtual network stack.
3635 * There might be a duplicate entry here in case the privilege
3636 * is only granted conditionally in the legacy jail case.
3637 */
3638 switch (priv) {
3639#ifdef notyet
3640 /*
3641 * NFS-specific privileges.
3642 */
3643 case PRIV_NFS_DAEMON:
3644 case PRIV_NFS_LOCKD:
3645#endif
3646 /*
3647 * Network stack privileges.
3648 */
3649 case PRIV_NET_BRIDGE:
3650 case PRIV_NET_GRE:
3651 case PRIV_NET_BPF:
3652 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */
3653 case PRIV_NET_ROUTE:
3654 case PRIV_NET_TAP:
3655 case PRIV_NET_SETIFMTU:
3656 case PRIV_NET_SETIFFLAGS:
3657 case PRIV_NET_SETIFCAP:
3658 case PRIV_NET_SETIFDESCR:
3659 case PRIV_NET_SETIFNAME :
3660 case PRIV_NET_SETIFMETRIC:
3661 case PRIV_NET_SETIFPHYS:
3662 case PRIV_NET_SETIFMAC:
3663 case PRIV_NET_SETLANPCP:
3664 case PRIV_NET_ADDMULTI:
3665 case PRIV_NET_DELMULTI:
3666 case PRIV_NET_HWIOCTL:
3667 case PRIV_NET_SETLLADDR:
3668 case PRIV_NET_ADDIFGROUP:
3669 case PRIV_NET_DELIFGROUP:
3670 case PRIV_NET_IFCREATE:
3671 case PRIV_NET_IFDESTROY:
3672 case PRIV_NET_ADDIFADDR:
3673 case PRIV_NET_DELIFADDR:
3674 case PRIV_NET_LAGG:
3675 case PRIV_NET_GIF:
3676 case PRIV_NET_SETIFVNET:
3677 case PRIV_NET_SETIFFIB:
3678
3679 /*
3680 * 802.11-related privileges.
3681 */
3682 case PRIV_NET80211_VAP_GETKEY:
3683 case PRIV_NET80211_VAP_MANAGE:
3684
3685#ifdef notyet
3686 /*
3687 * ATM privileges.
3688 */
3689 case PRIV_NETATM_CFG:
3690 case PRIV_NETATM_ADD:
3691 case PRIV_NETATM_DEL:
3692 case PRIV_NETATM_SET:
3693
3694 /*
3695 * Bluetooth privileges.
3696 */
3697 case PRIV_NETBLUETOOTH_RAW:
3698#endif
3699
3700 /*
3701 * Netgraph and netgraph module privileges.
3702 */
3703 case PRIV_NETGRAPH_CONTROL:
3704#ifdef notyet
3705 case PRIV_NETGRAPH_TTY:
3706#endif
3707
3708 /*
3709 * IPv4 and IPv6 privileges.
3710 */
3711 case PRIV_NETINET_IPFW:
3712 case PRIV_NETINET_DIVERT:
3713 case PRIV_NETINET_PF:
3714 case PRIV_NETINET_DUMMYNET:
3715 case PRIV_NETINET_CARP:
3716 case PRIV_NETINET_MROUTE:
3717 case PRIV_NETINET_RAW:
3718 case PRIV_NETINET_ADDRCTRL6:
3719 case PRIV_NETINET_ND6:
3720 case PRIV_NETINET_SCOPE6:
3721 case PRIV_NETINET_ALIFETIME6:
3722 case PRIV_NETINET_IPSEC:
3723 case PRIV_NETINET_BINDANY:
3724
3725#ifdef notyet
3726 /*
3727 * NCP privileges.
3728 */
3729 case PRIV_NETNCP:
3730
3731 /*
3732 * SMB privileges.
3733 */
3734 case PRIV_NETSMB:
3735#endif
3736
3737 /*
3738 * No default: or deny here.
3739 * In case of no permit fall through to next switch().
3740 */
3741 if (cred->cr_prison->pr_flags & PR_VNET)
3742 return (0);
3743 }
3744#endif /* VIMAGE */
3745
3746 switch (priv) {
3747 /*
3748 * Allow ktrace privileges for root in jail.
3749 */
3750 case PRIV_KTRACE:
3751
3752#if 0
3753 /*
3754 * Allow jailed processes to configure audit identity and
3755 * submit audit records (login, etc). In the future we may
3756 * want to further refine the relationship between audit and
3757 * jail.
3758 */
3759 case PRIV_AUDIT_GETAUDIT:
3760 case PRIV_AUDIT_SETAUDIT:
3761 case PRIV_AUDIT_SUBMIT:
3762#endif
3763
3764 /*
3765 * Allow jailed processes to manipulate process UNIX
3766 * credentials in any way they see fit.
3767 */
3768 case PRIV_CRED_SETUID:
3769 case PRIV_CRED_SETEUID:
3770 case PRIV_CRED_SETGID:
3771 case PRIV_CRED_SETEGID:
3772 case PRIV_CRED_SETGROUPS:
3773 case PRIV_CRED_SETREUID:
3774 case PRIV_CRED_SETREGID:
3775 case PRIV_CRED_SETRESUID:
3776 case PRIV_CRED_SETRESGID:
3777
3778 /*
3779 * Jail implements visibility constraints already, so allow
3780 * jailed root to override uid/gid-based constraints.
3781 */
3782 case PRIV_SEEOTHERGIDS:
3783 case PRIV_SEEOTHERUIDS:
3784
3785 /*
3786 * Jail implements inter-process debugging limits already, so
3787 * allow jailed root various debugging privileges.
3788 */
3789 case PRIV_DEBUG_DIFFCRED:
3790 case PRIV_DEBUG_SUGID:
3791 case PRIV_DEBUG_UNPRIV:
3792
3793 /*
3794 * Allow jail to set various resource limits and login
3795 * properties, and for now, exceed process resource limits.
3796 */
3797 case PRIV_PROC_LIMIT:
3798 case PRIV_PROC_SETLOGIN:
3799 case PRIV_PROC_SETRLIMIT:
3800
3801 /*
3802 * System V and POSIX IPC privileges are granted in jail.
3803 */
3804 case PRIV_IPC_READ:
3805 case PRIV_IPC_WRITE:
3806 case PRIV_IPC_ADMIN:
3807 case PRIV_IPC_MSGSIZE:
3808 case PRIV_MQ_ADMIN:
3809
3810 /*
3811 * Jail operations within a jail work on child jails.
3812 */
3813 case PRIV_JAIL_ATTACH:
3814 case PRIV_JAIL_SET:
3815 case PRIV_JAIL_REMOVE:
3816
3817 /*
3818 * Jail implements its own inter-process limits, so allow
3819 * root processes in jail to change scheduling on other
3820 * processes in the same jail. Likewise for signalling.
3821 */
3822 case PRIV_SCHED_DIFFCRED:
3823 case PRIV_SCHED_CPUSET:
3824 case PRIV_SIGNAL_DIFFCRED:
3825 case PRIV_SIGNAL_SUGID:
3826
3827 /*
3828 * Allow jailed processes to write to sysctls marked as jail
3829 * writable.
3830 */
3831 case PRIV_SYSCTL_WRITEJAIL:
3832
3833 /*
3834 * Allow root in jail to manage a variety of quota
3835 * properties. These should likely be conditional on a
3836 * configuration option.
3837 */
3838 case PRIV_VFS_GETQUOTA:
3839 case PRIV_VFS_SETQUOTA:
3840
3841 /*
3842 * Since Jail relies on chroot() to implement file system
3843 * protections, grant many VFS privileges to root in jail.
3844 * Be careful to exclude mount-related and NFS-related
3845 * privileges.
3846 */
3847 case PRIV_VFS_READ:
3848 case PRIV_VFS_WRITE:
3849 case PRIV_VFS_ADMIN:
3850 case PRIV_VFS_EXEC:
3851 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */
3852 case PRIV_VFS_CHFLAGS_DEV:
3853 case PRIV_VFS_CHOWN:
3854 case PRIV_VFS_CHROOT:
3855 case PRIV_VFS_RETAINSUGID:
3856 case PRIV_VFS_FCHROOT:
3857 case PRIV_VFS_LINK:
3858 case PRIV_VFS_SETGID:
3859 case PRIV_VFS_STAT:
3860 case PRIV_VFS_STICKYFILE:
3861
3862 /*
3863 * As in the non-jail case, non-root users are expected to be
3864 * able to read kernel/physical memory (provided /dev/[k]mem
3865 * exists in the jail and they have permission to access it).
3866 */
3867 case PRIV_KMEM_READ:
3868 return (0);
3869
3870 /*
3871 * Depending on the global setting, allow privilege of
3872 * setting system flags.
3873 */
3874 case PRIV_VFS_SYSFLAGS:
3875 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
3876 return (0);
3877 else
3878 return (EPERM);
3879
3880 /*
3881 * Depending on the global setting, allow privilege of
3882 * mounting/unmounting file systems.
3883 */
3884 case PRIV_VFS_MOUNT:
3885 case PRIV_VFS_UNMOUNT:
3886 case PRIV_VFS_MOUNT_NONUSER:
3887 case PRIV_VFS_MOUNT_OWNER:
3888 pr = cred->cr_prison;
3889 prison_lock(pr);
3890 if (pr->pr_allow & PR_ALLOW_MOUNT && pr->pr_enforce_statfs < 2)
3891 error = 0;
3892 else
3893 error = EPERM;
3894 prison_unlock(pr);
3895 return (error);
3896
3897 /*
3898 * Jails should hold no disposition on the PRIV_VFS_READ_DIR
3899 * policy. priv_check_cred will not specifically allow it, and
3900 * we may want a MAC policy to allow it.
3901 */
3902 case PRIV_VFS_READ_DIR:
3903 return (0);
3904
3905 /*
3906 * Conditionnaly allow locking (unlocking) physical pages
3907 * in memory.
3908 */
3909 case PRIV_VM_MLOCK:
3910 case PRIV_VM_MUNLOCK:
3911 if (cred->cr_prison->pr_allow & PR_ALLOW_MLOCK)
3912 return (0);
3913 else
3914 return (EPERM);
3915
3916 /*
3917 * Conditionally allow jailed root to bind reserved ports.
3918 */
3919 case PRIV_NETINET_RESERVEDPORT:
3920 if (cred->cr_prison->pr_allow & PR_ALLOW_RESERVED_PORTS)
3921 return (0);
3922 else
3923 return (EPERM);
3924
3925 /*
3926 * Allow jailed root to reuse in-use ports.
3927 */
3928 case PRIV_NETINET_REUSEPORT:
3929 return (0);
3930
3931 /*
3932 * Allow jailed root to set certain IPv4/6 (option) headers.
3933 */
3934 case PRIV_NETINET_SETHDROPTS:
3935 return (0);
3936
3937 /*
3938 * Conditionally allow creating raw sockets in jail.
3939 */
3940 case PRIV_NETINET_RAW:
3941 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
3942 return (0);
3943 else
3944 return (EPERM);
3945
3946 /*
3947 * Since jail implements its own visibility limits on netstat
3948 * sysctls, allow getcred. This allows identd to work in
3949 * jail.
3950 */
3951 case PRIV_NETINET_GETCRED:
3952 return (0);
3953
3954 /*
3955 * Allow jailed root to set loginclass.
3956 */
3957 case PRIV_PROC_SETLOGINCLASS:
3958 return (0);
3959
3960 /*
3961 * Do not allow a process inside a jail to read the kernel
3962 * message buffer unless explicitly permitted.
3963 */
3964 case PRIV_MSGBUF:
3965 if (cred->cr_prison->pr_allow & PR_ALLOW_READ_MSGBUF)
3966 return (0);
3967 return (EPERM);
3968
3969 default:
3970 /*
3971 * In all remaining cases, deny the privilege request. This
3972 * includes almost all network privileges, many system
3973 * configuration privileges.
3974 */
3975 return (EPERM);
3976 }
3977}
3978
3979/*
3980 * Return the part of pr2's name that is relative to pr1, or the whole name
3981 * if it does not directly follow.
3982 */
3983
3984char *
3985prison_name(struct prison *pr1, struct prison *pr2)
3986{
3987 char *name;
3988
3989 /* Jails see themselves as "0" (if they see themselves at all). */
3990 if (pr1 == pr2)
3991 return "0";
3992 name = pr2->pr_name;
3993 if (prison_ischild(pr1, pr2)) {
3994 /*
3995 * pr1 isn't locked (and allprison_lock may not be either)
3996 * so its length can't be counted on. But the number of dots
3997 * can be counted on - and counted.
3998 */
3999 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
4000 name = strchr(name, '.') + 1;
4001 }
4002 return (name);
4003}
4004
4005/*
4006 * Return the part of pr2's path that is relative to pr1, or the whole path
4007 * if it does not directly follow.
4008 */
4009static char *
4010prison_path(struct prison *pr1, struct prison *pr2)
4011{
4012 char *path1, *path2;
4013 int len1;
4014
4015 path1 = pr1->pr_path;
4016 path2 = pr2->pr_path;
4017 if (!strcmp(path1, "/"))
4018 return (path2);
4019 len1 = strlen(path1);
4020 if (strncmp(path1, path2, len1))
4021 return (path2);
4022 if (path2[len1] == '\0')
4023 return "/";
4024 if (path2[len1] == '/')
4025 return (path2 + len1);
4026 return (path2);
4027}
4028
4029/*
4030 * Jail-related sysctls.
4031 */
4032static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4033 "Jails");
4034
4035#if defined(INET) || defined(INET6)
4036/*
4037 * Copy address array to memory that would be then SYSCTL_OUT-ed.
4038 * sysctl_jail_list() helper.
4039 */
4040static void
4041prison_ip_copyout(struct prison *pr, const pr_family_t af, void **out, int *len)
4042{
4043 const size_t size = pr_families[af].size;
4044
4045 again:
4046 mtx_assert(&pr->pr_mtx, MA_OWNED);
4047 if (pr->pr_addrs[af] != NULL) {
4048 if (*len < pr->pr_addrs[af]->ips) {
4049 *len = pr->pr_addrs[af]->ips;
4050 mtx_unlock(&pr->pr_mtx);
4051 *out = realloc(*out, *len * size, M_TEMP, M_WAITOK);
4052 mtx_lock(&pr->pr_mtx);
4053 goto again;
4054 }
4055 bcopy(pr->pr_addrs[af] + 1, *out, pr->pr_addrs[af]->ips * size);
4056 }
4057}
4058#endif
4059
4060static int
4061sysctl_jail_list(SYSCTL_HANDLER_ARGS)
4062{
4063 struct xprison *xp;
4064 struct prison *pr, *cpr;
4065#ifdef INET
4066 struct in_addr *ip4 = NULL;
4067 int ip4s = 0;
4068#endif
4069#ifdef INET6
4070 struct in6_addr *ip6 = NULL;
4071 int ip6s = 0;
4072#endif
4073 int descend, error;
4074
4075 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
4076 pr = req->td->td_ucred->cr_prison;
4077 error = 0;
4078 sx_slock(&allprison_lock);
4079 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
4080 mtx_lock(&cpr->pr_mtx);
4081#ifdef INET
4082 prison_ip_copyout(cpr, PR_INET, (void **)&ip4, &ip4s);
4083#endif
4084#ifdef INET6
4085 prison_ip_copyout(cpr, PR_INET6, (void **)&ip6, &ip6s);
4086#endif
4087 bzero(xp, sizeof(*xp));
4088 xp->pr_version = XPRISON_VERSION;
4089 xp->pr_id = cpr->pr_id;
4090 xp->pr_state = cpr->pr_state;
4091 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
4092 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
4093 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
4094#ifdef INET
4095 xp->pr_ip4s = ip4s;
4096#endif
4097#ifdef INET6
4098 xp->pr_ip6s = ip6s;
4099#endif
4100 mtx_unlock(&cpr->pr_mtx);
4101 error = SYSCTL_OUT(req, xp, sizeof(*xp));
4102 if (error)
4103 break;
4104#ifdef INET
4105 if (xp->pr_ip4s > 0) {
4106 error = SYSCTL_OUT(req, ip4,
4107 xp->pr_ip4s * sizeof(struct in_addr));
4108 if (error)
4109 break;
4110 }
4111#endif
4112#ifdef INET6
4113 if (xp->pr_ip6s > 0) {
4114 error = SYSCTL_OUT(req, ip6,
4115 xp->pr_ip6s * sizeof(struct in6_addr));
4116 if (error)
4117 break;
4118 }
4119#endif
4120 }
4121 sx_sunlock(&allprison_lock);
4122 free(xp, M_TEMP);
4123#ifdef INET
4124 free(ip4, M_TEMP);
4125#endif
4126#ifdef INET6
4127 free(ip6, M_TEMP);
4128#endif
4129 return (error);
4130}
4131
4132SYSCTL_OID(_security_jail, OID_AUTO, list,
4133 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4134 sysctl_jail_list, "S", "List of active jails");
4135
4136static int
4137sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
4138{
4139 int error, injail;
4140
4141 injail = jailed(req->td->td_ucred);
4142 error = SYSCTL_OUT(req, &injail, sizeof(injail));
4143
4144 return (error);
4145}
4146
4147SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
4148 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4149 sysctl_jail_jailed, "I", "Process in jail?");
4150
4151static int
4152sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
4153{
4154 int error, havevnet;
4155#ifdef VIMAGE
4156 struct ucred *cred = req->td->td_ucred;
4157
4158 havevnet = jailed(cred) && prison_owns_vnet(cred);
4159#else
4160 havevnet = 0;
4161#endif
4162 error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
4163
4164 return (error);
4165}
4166
4167SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
4168 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
4169 sysctl_jail_vnet, "I", "Jail owns vnet?");
4170
4171#if defined(INET) || defined(INET6)
4172SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
4173 &jail_max_af_ips, 0,
4174 "Number of IP addresses a jail may have at most per address family (deprecated)");
4175#endif
4176
4177/*
4178 * Default parameters for jail(2) compatibility. For historical reasons,
4179 * the sysctl names have varying similarity to the parameter names. Prisons
4180 * just see their own parameters, and can't change them.
4181 */
4182static int
4183sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
4184{
4185 int error, i;
4186
4187 /* Get the current flag value, and convert it to a boolean. */
4188 if (req->td->td_ucred->cr_prison == &prison0) {
4189 mtx_lock(&prison0.pr_mtx);
4190 i = (jail_default_allow & arg2) != 0;
4191 mtx_unlock(&prison0.pr_mtx);
4192 } else
4193 i = prison_allow(req->td->td_ucred, arg2);
4194
4195 if (arg1 != NULL)
4196 i = !i;
4197 error = sysctl_handle_int(oidp, &i, 0, req);
4198 if (error || !req->newptr)
4199 return (error);
4200 i = i ? arg2 : 0;
4201 if (arg1 != NULL)
4202 i ^= arg2;
4203 /*
4204 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
4205 * for writing.
4206 */
4207 mtx_lock(&prison0.pr_mtx);
4208 jail_default_allow = (jail_default_allow & ~arg2) | i;
4209 mtx_unlock(&prison0.pr_mtx);
4210 return (0);
4211}
4212
4213SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
4214 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4215 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
4216 "Processes in jail can set their hostnames (deprecated)");
4217SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
4218 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4219 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
4220 "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
4221SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
4222 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4223 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
4224 "Processes in jail can use System V IPC primitives (deprecated)");
4225SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
4226 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4227 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
4228 "Prison root can create raw sockets (deprecated)");
4229SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
4230 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4231 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
4232 "Processes in jail can alter system file flags (deprecated)");
4233SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
4234 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4235 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
4236 "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
4237
4238static int
4239sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
4240{
4241 struct prison *pr;
4242 int level, error;
4243
4244 pr = req->td->td_ucred->cr_prison;
4245 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
4246 error = sysctl_handle_int(oidp, &level, 0, req);
4247 if (error || !req->newptr)
4248 return (error);
4249 *(int *)arg1 = level;
4250 return (0);
4251}
4252
4253SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
4254 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4255 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
4256 sysctl_jail_default_level, "I",
4257 "Processes in jail cannot see all mounted file systems (deprecated)");
4258
4259SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
4260 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
4261 &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
4262 sysctl_jail_default_level, "I",
4263 "Ruleset for the devfs filesystem in jail (deprecated)");
4264
4265/*
4266 * Nodes to describe jail parameters. Maximum length of string parameters
4267 * is returned in the string itself, and the other parameters exist merely
4268 * to make themselves and their types known.
4269 */
4270SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
4271 "Jail parameters");
4272
4273int
4274sysctl_jail_param(SYSCTL_HANDLER_ARGS)
4275{
4276 int i;
4277 long l;
4278 size_t s;
4279 char numbuf[12];
4280
4281 switch (oidp->oid_kind & CTLTYPE)
4282 {
4283 case CTLTYPE_LONG:
4284 case CTLTYPE_ULONG:
4285 l = 0;
4286#ifdef SCTL_MASK32
4287 if (!(req->flags & SCTL_MASK32))
4288#endif
4289 return (SYSCTL_OUT(req, &l, sizeof(l)));
4290 case CTLTYPE_INT:
4291 case CTLTYPE_UINT:
4292 i = 0;
4293 return (SYSCTL_OUT(req, &i, sizeof(i)));
4294 case CTLTYPE_STRING:
4295 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
4296 return
4297 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
4298 case CTLTYPE_STRUCT:
4299 s = (size_t)arg2;
4300 return (SYSCTL_OUT(req, &s, sizeof(s)));
4301 }
4302 return (0);
4303}
4304
4305/*
4306 * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
4307 * jail creation time but cannot be changed in an existing jail.
4308 */
4309SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
4310SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
4311SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
4312SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
4313SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
4314 "I", "Jail secure level");
4315SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I",
4316 "Jail value for kern.osreldate and uname -K");
4317SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN,
4318 "Jail value for kern.osrelease and uname -r");
4319SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
4320 "I", "Jail cannot see all mounted file systems");
4321SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
4322 "I", "Ruleset for in-jail devfs mounts");
4323SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
4324 "B", "Jail persistence");
4325#ifdef VIMAGE
4326SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
4327 "E,jailsys", "Virtual network stack");
4328#endif
4329SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
4330 "B", "Jail is in the process of shutting down");
4331
4332SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
4333SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
4334 "I", "Current number of child jails");
4335SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
4336 "I", "Maximum number of child jails");
4337
4338SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
4339SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
4340 "Jail hostname");
4341SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
4342 "Jail NIS domainname");
4343SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
4344 "Jail host UUID");
4345SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
4346 "LU", "Jail host ID");
4347
4348SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
4349SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
4350
4351#ifdef INET
4352SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
4353 "Jail IPv4 address virtualization");
4354SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
4355 "S,in_addr,a", "Jail IPv4 addresses");
4356SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4357 "B", "Do (not) use IPv4 source address selection rather than the "
4358 "primary jail IPv4 address.");
4359#endif
4360#ifdef INET6
4361SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
4362 "Jail IPv6 address virtualization");
4363SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
4364 "S,in6_addr,a", "Jail IPv6 addresses");
4365SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
4366 "B", "Do (not) use IPv6 source address selection rather than the "
4367 "primary jail IPv6 address.");
4368#endif
4369
4370SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
4371SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
4372 "B", "Jail may set hostname");
4373SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
4374 "B", "Jail may use SYSV IPC");
4375SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
4376 "B", "Jail may create raw sockets");
4377SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
4378 "B", "Jail may alter system file flags");
4379SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
4380 "B", "Jail may set file quotas");
4381SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
4382 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
4383SYSCTL_JAIL_PARAM(_allow, mlock, CTLTYPE_INT | CTLFLAG_RW,
4384 "B", "Jail may lock (unlock) physical pages in memory");
4385SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT | CTLFLAG_RW,
4386 "B", "Jail may bind sockets to reserved ports");
4387SYSCTL_JAIL_PARAM(_allow, read_msgbuf, CTLTYPE_INT | CTLFLAG_RW,
4388 "B", "Jail may read the kernel message buffer");
4389SYSCTL_JAIL_PARAM(_allow, unprivileged_proc_debug, CTLTYPE_INT | CTLFLAG_RW,
4390 "B", "Unprivileged processes may use process debugging facilities");
4391SYSCTL_JAIL_PARAM(_allow, suser, CTLTYPE_INT | CTLFLAG_RW,
4392 "B", "Processes in jail with uid 0 have privilege");
4393
4394SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
4395SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
4396 "B", "Jail may mount/unmount jail-friendly file systems in general");
4397
4398/*
4399 * Add a dynamic parameter allow.<name>, or allow.<prefix>.<name>. Return
4400 * its associated bit in the pr_allow bitmask, or zero if the parameter was
4401 * not created.
4402 */
4403unsigned
4404prison_add_allow(const char *prefix, const char *name, const char *prefix_descr,
4405 const char *descr)
4406{
4407 struct bool_flags *bf;
4408 struct sysctl_oid *parent;
4409 char *allow_name, *allow_noname, *allowed;
4410#ifndef NO_SYSCTL_DESCR
4411 char *descr_deprecated;
4412#endif
4413 u_int allow_flag;
4414
4415 if (prefix
4416 ? asprintf(&allow_name, M_PRISON, "allow.%s.%s", prefix, name)
4417 < 0 ||
4418 asprintf(&allow_noname, M_PRISON, "allow.%s.no%s", prefix, name)
4419 < 0
4420 : asprintf(&allow_name, M_PRISON, "allow.%s", name) < 0 ||
4421 asprintf(&allow_noname, M_PRISON, "allow.no%s", name) < 0) {
4422 free(allow_name, M_PRISON);
4423 return 0;
4424 }
4425
4426 /*
4427 * See if this parameter has already beed added, i.e. a module was
4428 * previously loaded/unloaded.
4429 */
4430 mtx_lock(&prison0.pr_mtx);
4431 for (bf = pr_flag_allow;
4432 bf < pr_flag_allow + nitems(pr_flag_allow) &&
4433 atomic_load_int(&bf->flag) != 0;
4434 bf++) {
4435 if (strcmp(bf->name, allow_name) == 0) {
4436 allow_flag = bf->flag;
4437 goto no_add;
4438 }
4439 }
4440
4441 /*
4442 * Find a free bit in pr_allow_all, failing if there are none
4443 * (which shouldn't happen as long as we keep track of how many
4444 * potential dynamic flags exist).
4445 */
4446 for (allow_flag = 1;; allow_flag <<= 1) {
4447 if (allow_flag == 0)
4448 goto no_add;
4449 if ((pr_allow_all & allow_flag) == 0)
4450 break;
4451 }
4452
4453 /* Note the parameter in the next open slot in pr_flag_allow. */
4454 for (bf = pr_flag_allow; ; bf++) {
4455 if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
4456 /* This should never happen, but is not fatal. */
4457 allow_flag = 0;
4458 goto no_add;
4459 }
4460 if (atomic_load_int(&bf->flag) == 0)
4461 break;
4462 }
4463 bf->name = allow_name;
4464 bf->noname = allow_noname;
4465 pr_allow_all |= allow_flag;
4466 /*
4467 * prison0 always has permission for the new parameter.
4468 * Other jails must have it granted to them.
4469 */
4470 prison0.pr_allow |= allow_flag;
4471 /* The flag indicates a valid entry, so make sure it is set last. */
4472 atomic_store_rel_int(&bf->flag, allow_flag);
4473 mtx_unlock(&prison0.pr_mtx);
4474
4475 /*
4476 * Create sysctls for the paramter, and the back-compat global
4477 * permission.
4478 */
4479 parent = prefix
4480 ? SYSCTL_ADD_NODE(NULL,
4481 SYSCTL_CHILDREN(&sysctl___security_jail_param_allow),
4482 OID_AUTO, prefix, CTLFLAG_MPSAFE, 0, prefix_descr)
4483 : &sysctl___security_jail_param_allow;
4484 (void)SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
4485 name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
4486 NULL, 0, sysctl_jail_param, "B", descr);
4487 if ((prefix
4488 ? asprintf(&allowed, M_TEMP, "%s_%s_allowed", prefix, name)
4489 : asprintf(&allowed, M_TEMP, "%s_allowed", name)) >= 0) {
4490#ifndef NO_SYSCTL_DESCR
4491 (void)asprintf(&descr_deprecated, M_TEMP, "%s (deprecated)",
4492 descr);
4493#endif
4494 (void)SYSCTL_ADD_PROC(NULL,
4495 SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO, allowed,
4496 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, allow_flag,
4497 sysctl_jail_default_allow, "I", descr_deprecated);
4498#ifndef NO_SYSCTL_DESCR
4499 free(descr_deprecated, M_TEMP);
4500#endif
4501 free(allowed, M_TEMP);
4502 }
4503 return allow_flag;
4504
4505 no_add:
4506 mtx_unlock(&prison0.pr_mtx);
4507 free(allow_name, M_PRISON);
4508 free(allow_noname, M_PRISON);
4509 return allow_flag;
4510}
4511
4512/*
4513 * The VFS system will register jail-aware filesystems here. They each get
4514 * a parameter allow.mount.xxxfs and a flag to check when a jailed user
4515 * attempts to mount.
4516 */
4517void
4518prison_add_vfs(struct vfsconf *vfsp)
4519{
4520#ifdef NO_SYSCTL_DESCR
4521
4522 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
4523 NULL, NULL);
4524#else
4525 char *descr;
4526
4527 (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
4528 vfsp->vfc_name);
4529 vfsp->vfc_prison_flag = prison_add_allow("mount", vfsp->vfc_name,
4530 NULL, descr);
4531 free(descr, M_TEMP);
4532#endif
4533}
4534
4535#ifdef RACCT
4536void
4537prison_racct_foreach(void (*callback)(struct racct *racct,
4538 void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
4539 void *arg2, void *arg3)
4540{
4541 struct prison_racct *prr;
4542
4543 ASSERT_RACCT_ENABLED();
4544
4545 sx_slock(&allprison_lock);
4546 if (pre != NULL)
4547 (pre)();
4548 LIST_FOREACH(prr, &allprison_racct, prr_next)
4549 (callback)(prr->prr_racct, arg2, arg3);
4550 if (post != NULL)
4551 (post)();
4552 sx_sunlock(&allprison_lock);
4553}
4554
4555static struct prison_racct *
4556prison_racct_find_locked(const char *name)
4557{
4558 struct prison_racct *prr;
4559
4560 ASSERT_RACCT_ENABLED();
4561 sx_assert(&allprison_lock, SA_XLOCKED);
4562
4563 if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
4564 return (NULL);
4565
4566 LIST_FOREACH(prr, &allprison_racct, prr_next) {
4567 if (strcmp(name, prr->prr_name) != 0)
4568 continue;
4569
4570 /* Found prison_racct with a matching name? */
4571 prison_racct_hold(prr);
4572 return (prr);
4573 }
4574
4575 /* Add new prison_racct. */
4576 prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
4577 racct_create(&prr->prr_racct);
4578
4579 strcpy(prr->prr_name, name);
4580 refcount_init(&prr->prr_refcount, 1);
4581 LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
4582
4583 return (prr);
4584}
4585
4586struct prison_racct *
4587prison_racct_find(const char *name)
4588{
4589 struct prison_racct *prr;
4590
4591 ASSERT_RACCT_ENABLED();
4592
4593 sx_xlock(&allprison_lock);
4594 prr = prison_racct_find_locked(name);
4595 sx_xunlock(&allprison_lock);
4596 return (prr);
4597}
4598
4599void
4600prison_racct_hold(struct prison_racct *prr)
4601{
4602
4603 ASSERT_RACCT_ENABLED();
4604
4605 refcount_acquire(&prr->prr_refcount);
4606}
4607
4608static void
4609prison_racct_free_locked(struct prison_racct *prr)
4610{
4611
4612 ASSERT_RACCT_ENABLED();
4613 sx_assert(&allprison_lock, SA_XLOCKED);
4614
4615 if (refcount_release(&prr->prr_refcount)) {
4616 racct_destroy(&prr->prr_racct);
4617 LIST_REMOVE(prr, prr_next);
4618 free(prr, M_PRISON_RACCT);
4619 }
4620}
4621
4622void
4623prison_racct_free(struct prison_racct *prr)
4624{
4625
4626 ASSERT_RACCT_ENABLED();
4627 sx_assert(&allprison_lock, SA_UNLOCKED);
4628
4629 if (refcount_release_if_not_last(&prr->prr_refcount))
4630 return;
4631
4632 sx_xlock(&allprison_lock);
4633 prison_racct_free_locked(prr);
4634 sx_xunlock(&allprison_lock);
4635}
4636
4637static void
4638prison_racct_attach(struct prison *pr)
4639{
4640 struct prison_racct *prr;
4641
4642 ASSERT_RACCT_ENABLED();
4643 sx_assert(&allprison_lock, SA_XLOCKED);
4644
4645 prr = prison_racct_find_locked(pr->pr_name);
4646 KASSERT(prr != NULL, ("cannot find prison_racct"));
4647
4648 pr->pr_prison_racct = prr;
4649}
4650
4651/*
4652 * Handle jail renaming. From the racct point of view, renaming means
4653 * moving from one prison_racct to another.
4654 */
4655static void
4656prison_racct_modify(struct prison *pr)
4657{
4658#ifdef RCTL
4659 struct proc *p;
4660 struct ucred *cred;
4661#endif
4662 struct prison_racct *oldprr;
4663
4664 ASSERT_RACCT_ENABLED();
4665
4666 sx_slock(&allproc_lock);
4667 sx_xlock(&allprison_lock);
4668
4669 if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
4670 sx_xunlock(&allprison_lock);
4671 sx_sunlock(&allproc_lock);
4672 return;
4673 }
4674
4675 oldprr = pr->pr_prison_racct;
4676 pr->pr_prison_racct = NULL;
4677
4678 prison_racct_attach(pr);
4679
4680 /*
4681 * Move resource utilisation records.
4682 */
4683 racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
4684
4685#ifdef RCTL
4686 /*
4687 * Force rctl to reattach rules to processes.
4688 */
4689 FOREACH_PROC_IN_SYSTEM(p) {
4690 PROC_LOCK(p);
4691 cred = crhold(p->p_ucred);
4692 PROC_UNLOCK(p);
4693 rctl_proc_ucred_changed(p, cred);
4694 crfree(cred);
4695 }
4696#endif
4697
4698 sx_sunlock(&allproc_lock);
4699 prison_racct_free_locked(oldprr);
4700 sx_xunlock(&allprison_lock);
4701}
4702
4703static void
4704prison_racct_detach(struct prison *pr)
4705{
4706
4707 ASSERT_RACCT_ENABLED();
4708 sx_assert(&allprison_lock, SA_UNLOCKED);
4709
4710 if (pr->pr_prison_racct == NULL)
4711 return;
4712 prison_racct_free(pr->pr_prison_racct);
4713 pr->pr_prison_racct = NULL;
4714}
4715#endif /* RACCT */
4716
4717#ifdef DDB
4718
4719static void
4720db_show_prison(struct prison *pr)
4721{
4722 struct bool_flags *bf;
4723 struct jailsys_flags *jsf;
4724#if defined(INET) || defined(INET6)
4725 int ii;
4726#endif
4727 unsigned f;
4728#ifdef INET
4729 char ip4buf[INET_ADDRSTRLEN];
4730#endif
4731#ifdef INET6
4732 char ip6buf[INET6_ADDRSTRLEN];
4733#endif
4734
4735 db_printf("prison %p:\n", pr);
4736 db_printf(" jid = %d\n", pr->pr_id);
4737 db_printf(" name = %s\n", pr->pr_name);
4738 db_printf(" parent = %p\n", pr->pr_parent);
4739 db_printf(" ref = %d\n", pr->pr_ref);
4740 db_printf(" uref = %d\n", pr->pr_uref);
4741 db_printf(" state = %s\n",
4742 pr->pr_state == PRISON_STATE_ALIVE ? "alive" :
4743 pr->pr_state == PRISON_STATE_DYING ? "dying" :
4744 "invalid");
4745 db_printf(" path = %s\n", pr->pr_path);
4746 db_printf(" cpuset = %d\n", pr->pr_cpuset
4747 ? pr->pr_cpuset->cs_id : -1);
4748#ifdef VIMAGE
4749 db_printf(" vnet = %p\n", pr->pr_vnet);
4750#endif
4751 db_printf(" root = %p\n", pr->pr_root);
4752 db_printf(" securelevel = %d\n", pr->pr_securelevel);
4753 db_printf(" devfs_rsnum = %d\n", pr->pr_devfs_rsnum);
4754 db_printf(" children.max = %d\n", pr->pr_childmax);
4755 db_printf(" children.cur = %d\n", pr->pr_childcount);
4756 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children));
4757 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling));
4758 db_printf(" flags = 0x%x", pr->pr_flags);
4759 for (bf = pr_flag_bool; bf < pr_flag_bool + nitems(pr_flag_bool); bf++)
4760 if (pr->pr_flags & bf->flag)
4761 db_printf(" %s", bf->name);
4762 for (jsf = pr_flag_jailsys;
4763 jsf < pr_flag_jailsys + nitems(pr_flag_jailsys);
4764 jsf++) {
4765 f = pr->pr_flags & (jsf->disable | jsf->new);
4766 db_printf(" %-16s= %s\n", jsf->name,
4767 (f != 0 && f == jsf->disable) ? "disable"
4768 : (f == jsf->new) ? "new"
4769 : "inherit");
4770 }
4771 db_printf(" allow = 0x%x", pr->pr_allow);
4772 for (bf = pr_flag_allow;
4773 bf < pr_flag_allow + nitems(pr_flag_allow) &&
4774 atomic_load_int(&bf->flag) != 0;
4775 bf++)
4776 if (pr->pr_allow & bf->flag)
4777 db_printf(" %s", bf->name);
4778 db_printf("\n");
4779 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs);
4780 db_printf(" host.hostname = %s\n", pr->pr_hostname);
4781 db_printf(" host.domainname = %s\n", pr->pr_domainname);
4782 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid);
4783 db_printf(" host.hostid = %lu\n", pr->pr_hostid);
4784#ifdef INET
4785 if (pr->pr_addrs[PR_INET] != NULL) {
4786 pr_family_t af = PR_INET;
4787
4788 db_printf(" ip4s = %d\n", pr->pr_addrs[af]->ips);
4789 for (ii = 0; ii < pr->pr_addrs[af]->ips; ii++)
4790 db_printf(" %s %s\n",
4791 ii == 0 ? "ip4.addr =" : " ",
4792 inet_ntoa_r(
4793 *(const struct in_addr *)PR_IP(pr, ii),
4794 ip4buf));
4795 }
4796#endif
4797#ifdef INET6
4798 if (pr->pr_addrs[PR_INET6] != NULL) {
4799 pr_family_t af = PR_INET6;
4800
4801 db_printf(" ip6s = %d\n", pr->pr_addrs[af]->ips);
4802 for (ii = 0; ii < pr->pr_addrs[af]->ips; ii++)
4803 db_printf(" %s %s\n",
4804 ii == 0 ? "ip6.addr =" : " ",
4805 ip6_sprintf(ip6buf,
4806 (const struct in6_addr *)PR_IP(pr, ii)));
4807 }
4808#endif
4809}
4810
4811DB_SHOW_COMMAND(prison, db_show_prison_command)
4812{
4813 struct prison *pr;
4814
4815 if (!have_addr) {
4816 /*
4817 * Show all prisons in the list, and prison0 which is not
4818 * listed.
4819 */
4820 db_show_prison(&prison0);
4821 if (!db_pager_quit) {
4822 TAILQ_FOREACH(pr, &allprison, pr_list) {
4823 db_show_prison(pr);
4824 if (db_pager_quit)
4825 break;
4826 }
4827 }
4828 return;
4829 }
4830
4831 if (addr == 0)
4832 pr = &prison0;
4833 else {
4834 /* Look for a prison with the ID and with references. */
4835 TAILQ_FOREACH(pr, &allprison, pr_list)
4836 if (pr->pr_id == addr && pr->pr_ref > 0)
4837 break;
4838 if (pr == NULL)
4839 /* Look again, without requiring a reference. */
4840 TAILQ_FOREACH(pr, &allprison, pr_list)
4841 if (pr->pr_id == addr)
4842 break;
4843 if (pr == NULL)
4844 /* Assume address points to a valid prison. */
4845 pr = (struct prison *)addr;
4846 }
4847 db_show_prison(pr);
4848}
4849
4850#endif /* DDB */
level
const struct cf_level * level
Definition: cpufreq_if.m:45
_cpuset
struct _cpuset * _cpuset
Definition: bus_if.m:871
parent
device_t parent
Definition: device_if.m:187
name
const char * name
Definition: kern_fail.c:145
bootverbose
int bootverbose
Definition: init_main.c:131
_Static_assert
_Static_assert(sizeof(struct acctv3) - offsetof(struct acctv3, ac_trailer)==sizeof(struct acctv2) - offsetof(struct acctv2, ac_trailer), "trailer")
SYSCTL_UINT
SYSCTL_UINT(_kern_eventtimer, OID_AUTO, idletick, CTLFLAG_RWTUN, &idletick, 0, "Run periodic events when idle")
cpuset_ref
struct cpuset * cpuset_ref(struct cpuset *set)
Definition: kern_cpuset.c:174
cpuset_rel
void cpuset_rel(struct cpuset *set)
Definition: kern_cpuset.c:208
cpuset_setproc_update_set
int cpuset_setproc_update_set(struct proc *p, struct cpuset *set)
Definition: kern_cpuset.c:1707
cpuset_create_root
int cpuset_create_root(struct prison *pr, struct cpuset **setp)
Definition: kern_cpuset.c:1683
pwd_chroot_chdir
int pwd_chroot_chdir(struct thread *td, struct vnode *vp)
Definition: kern_descrip.c:3926
get_next_prid
static int get_next_prid(struct prison **insprp)
Definition: kern_jail.c:2149
PD_LIST_XLOCKED
#define PD_LIST_XLOCKED
prison_check_af
int prison_check_af(struct ucred *cred, int af)
Definition: kern_jail.c:3274
prison_flag
int prison_flag(struct ucred *cred, unsigned flag)
Definition: kern_jail.c:2754
PD_LOCK_FLAGS
#define PD_LOCK_FLAGS
prison_set_allow_locked
static void prison_set_allow_locked(struct prison *pr, unsigned flag, int enable)
Definition: kern_jail.c:3253
sys_jail_get
int sys_jail_get(struct thread *td, struct jail_get_args *uap)
Definition: kern_jail.c:2211
prison_proc_free_not_last
static void prison_proc_free_not_last(struct prison *pr)
Definition: kern_jail.c:2903
SYSCTL_OID
SYSCTL_OID(_security_jail, OID_AUTO, list, CTLTYPE_STRUCT|CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, 0, sysctl_jail_list, "S", "List of active jails")
prison_proc_hold
void prison_proc_hold(struct prison *pr)
Definition: kern_jail.c:2856
jail_default_allow
static unsigned jail_default_allow
Definition: kern_jail.c:227
prison_add_allow
unsigned prison_add_allow(const char *prefix, const char *name, const char *prefix_descr, const char *descr)
Definition: kern_jail.c:4404
pr_flag_bool_size
const size_t pr_flag_bool_size
Definition: kern_jail.c:181
pr_flag_jailsys_size
const size_t pr_flag_jailsys_size
Definition: kern_jail.c:195
SYSCTL_NODE
static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW|CTLFLAG_MPSAFE, 0, "Jails")
prison_isvalid
bool prison_isvalid(struct prison *pr)
Definition: kern_jail.c:3419
prison_isalive
bool prison_isalive(const struct prison *pr)
Definition: kern_jail.c:3403
prison_canseemount
int prison_canseemount(struct ucred *cred, struct mount *mp)
Definition: kern_jail.c:3528
SYSCTL_JAIL_PARAM
SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT|CTLFLAG_RDTUN, "I", "Jail ID")
prison_ischild
int prison_ischild(struct prison *pr1, struct prison *pr2)
Definition: kern_jail.c:3389
sysctl_jail_param
int sysctl_jail_param(SYSCTL_HANDLER_ARGS)
Definition: kern_jail.c:4274
JAIL_DEFAULT_ENFORCE_STATFS
#define JAIL_DEFAULT_ENFORCE_STATFS
Definition: kern_jail.c:225
SYSCTL_PROC
SYSCTL_PROC(_security_jail, OID_AUTO, jailed, CTLTYPE_INT|CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, 0, sysctl_jail_jailed, "I", "Process in jail?")
sys_jail_remove
int sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
Definition: kern_jail.c:2525
allprison
struct prisonlist allprison
Definition: kern_jail.c:136
_PR_IP_SADDRSEL
#define _PR_IP_SADDRSEL
Definition: kern_jail.c:96
getjailname
void getjailname(struct ucred *cred, char *name, size_t len)
Definition: kern_jail.c:3493
sys_jail_set
int sys_jail_set(struct thread *td, struct jail_set_args *uap)
Definition: kern_jail.c:518
pr_allow_all
static unsigned pr_allow_all
Definition: kern_jail.c:218
SYSCTL_JAIL_PARAM_NODE
SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails")
prison_proc_free
void prison_proc_free(struct prison *pr)
Definition: kern_jail.c:2874
SYSCTL_JAIL_PARAM_STRING
SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name")
sysctl_jail_jailed
static int sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
Definition: kern_jail.c:4137
prison_hold
void prison_hold(struct prison *pr)
Definition: kern_jail.c:2783
sys_jail_attach
int sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
Definition: kern_jail.c:2556
PD_DEREF
#define PD_DEREF
prison_find_name
struct prison * prison_find_name(struct prison *mypr, const char *name)
Definition: kern_jail.c:2721
SX_SYSINIT
SX_SYSINIT(allprison_lock, &allprison_lock, "allprison")
prison_priv_check
int prison_priv_check(struct ucred *cred, int priv)
Definition: kern_jail.c:3613
SYSCTL_JAIL_PARAM_SYS_NODE
SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info")
SYSCTL_JAIL_PARAM_SUBNODE
SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags")
pr_flag_allow
static struct bool_flags pr_flag_allow[NBBY *NBPW]
Definition: kern_jail.c:202
pr_flag_allow_size
const size_t pr_flag_allow_size
Definition: kern_jail.c:219
prison_hold_locked
void prison_hold_locked(struct prison *pr)
Definition: kern_jail.c:2775
prison0
struct prison prison0
Definition: kern_jail.c:101
allprison_lock
struct sx allprison_lock
Definition: kern_jail.c:134
PD_KILL
#define PD_KILL
prison_set_allow
void prison_set_allow(struct ucred *cred, unsigned flag, int enable)
Definition: kern_jail.c:3240
sys_jail
int sys_jail(struct thread *td, struct jail_args *uap)
Definition: kern_jail.c:304
jail_default_devfs_rsnum
static int jail_default_devfs_rsnum
Definition: kern_jail.c:229
prison0_init
void prison0_init(void)
Definition: kern_jail.c:239
JAIL_DEFAULT_DEVFS_RSNUM
#define JAIL_DEFAULT_DEVFS_RSNUM
Definition: kern_jail.c:226
__FBSDID
__FBSDID("$FreeBSD$")
prison_enforce_statfs
void prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
Definition: kern_jail.c:3563
JAIL_DEFAULT_ALLOW
#define JAIL_DEFAULT_ALLOW
Definition: kern_jail.c:221
prison_add_vfs
void prison_add_vfs(struct vfsconf *vfsp)
Definition: kern_jail.c:4518
prison_free_not_last
static void prison_free_not_last(struct prison *pr)
Definition: kern_jail.c:2829
PD_LOCKED
#define PD_LOCKED
PD_DEUREF
#define PD_DEUREF
kern_jail_set
int kern_jail_set(struct thread *td, struct uio *optuio, int flags)
Definition: kern_jail.c:928
prison_find
struct prison * prison_find(int prid)
Definition: kern_jail.c:2679
jailed_without_vnet
int jailed_without_vnet(struct ucred *cred)
Definition: kern_jail.c:3434
MALLOC_DEFINE
MALLOC_DEFINE(M_PRISON, "prison", "Prison structures")
do_jail_attach
static int do_jail_attach(struct thread *td, struct prison *pr, int drflags)
Definition: kern_jail.c:2583
prison_free_locked
void prison_free_locked(struct prison *pr)
Definition: kern_jail.c:2800
prison_check
int prison_check(struct ucred *cred1, struct ucred *cred2)
Definition: kern_jail.c:3378
prison_allow
int prison_allow(struct ucred *cred, unsigned flag)
Definition: kern_jail.c:2761
prison_deref
static void prison_deref(struct prison *pr, int flags)
Definition: kern_jail.c:2950
sysctl_jail_vnet
static int sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
Definition: kern_jail.c:4152
prison_deref_kill
static void prison_deref_kill(struct prison *pr, struct prisonlist *freeprison)
Definition: kern_jail.c:3119
sysctl_jail_list
static int sysctl_jail_list(SYSCTL_HANDLER_ARGS)
Definition: kern_jail.c:4061
prison_if
int prison_if(struct ucred *cred, const struct sockaddr *sa)
Definition: kern_jail.c:3334
kern_jail_get
int kern_jail_get(struct thread *td, struct uio *optuio, int flags)
Definition: kern_jail.c:2232
sysctl_jail_default_allow
static int sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
Definition: kern_jail.c:4183
prison_name
char * prison_name(struct prison *pr1, struct prison *pr2)
Definition: kern_jail.c:3985
PRISON0_HOSTUUID_MODULE
#define PRISON0_HOSTUUID_MODULE
Definition: kern_jail.c:80
prison_lock_xlock
static int prison_lock_xlock(struct prison *pr, int flags)
Definition: kern_jail.c:3205
kern_jail
int kern_jail(struct thread *td, struct jail *j)
Definition: kern_jail.c:353
prison_find_child
struct prison * prison_find_child(struct prison *mypr, int prid)
Definition: kern_jail.c:2700
getcredhostname
void getcredhostname(struct ucred *cred, char *buf, size_t size)
Definition: kern_jail.c:3451
pr_flag_jailsys
static struct jailsys_flags pr_flag_jailsys[]
Definition: kern_jail.c:183
getcreddomainname
void getcreddomainname(struct ucred *cred, char *buf, size_t size)
Definition: kern_jail.c:3466
jail_default_enforce_statfs
static int jail_default_enforce_statfs
Definition: kern_jail.c:228
LIST_HEAD
LIST_HEAD(prison_racct)
Definition: kern_jail.c:137
prison_complete
static void prison_complete(void *context, int pending)
Definition: kern_jail.c:2924
prison_path
static char * prison_path(struct prison *pr1, struct prison *pr2)
Definition: kern_jail.c:4010
sysctl_jail_default_level
static int sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
Definition: kern_jail.c:4239
PD_LIST_SLOCKED
#define PD_LIST_SLOCKED
getcredhostid
void getcredhostid(struct ucred *cred, unsigned long *hostid)
Definition: kern_jail.c:3484
getcredhostuuid
void getcredhostuuid(struct ucred *cred, char *buf, size_t size)
Definition: kern_jail.c:3475
prison_free
void prison_free(struct prison *pr)
Definition: kern_jail.c:2813
MTX_SYSINIT
MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF)
malloc
void *() malloc(size_t size, struct malloc_type *mtp, int flags)
Definition: kern_malloc.c:632
realloc
void * realloc(void *addr, size_t size, struct malloc_type *mtp, int flags)
Definition: kern_malloc.c:987
free
void free(void *addr, struct malloc_type *mtp)
Definition: kern_malloc.c:907
pr
static struct pollrec pr[POLL_LIST_LEN]
Definition: kern_poll.c:261
priv_check
int priv_check(struct thread *td, int priv)
Definition: kern_priv.c:271
allproc_lock
struct sx __exclusive_cache_line allproc_lock
Definition: kern_proc.c:134
crget
struct ucred * crget(void)
Definition: kern_prot.c:1991
setsugid
void setsugid(struct proc *p)
Definition: kern_prot.c:2395
proc_set_cred
void proc_set_cred(struct proc *p, struct ucred *newcred)
Definition: kern_prot.c:2181
crcopysafe
struct ucred * crcopysafe(struct proc *p, struct ucred *cr)
Definition: kern_prot.c:2220
crhold
struct ucred * crhold(struct ucred *cr)
Definition: kern_prot.c:2014
crfree
void crfree(struct ucred *cr)
Definition: kern_prot.c:2035
kern_psignal
void kern_psignal(struct proc *p, int sig)
Definition: kern_sig.c:2117
sysctl_handle_int
int sysctl_handle_int(SYSCTL_HANDLER_ARGS)
Definition: kern_sysctl.c:1644
sysctl_handle_string
int sysctl_handle_string(SYSCTL_HANDLER_ARGS)
Definition: kern_sysctl.c:1778
validate_uuid
int validate_uuid(const char *str, size_t size, struct uuid *uuid, int flags)
Definition: kern_uuid.c:385
callback
linker_function_name_callback_t callback
Definition: linker_if.m:74
domain
struct iommu_domain ** domain
Definition: msi_if.m:96
data
uint32_t * data
Definition: msi_if.m:90
addr
uint64_t * addr
Definition: msi_if.m:89
bool_flags
Definition: kern_jail.c:122
bool_flags::noname
const char * noname
Definition: kern_jail.c:124
bool_flags::name
const char * name
Definition: kern_jail.c:123
bool_flags::flag
volatile u_int flag
Definition: kern_jail.c:125
jailsys_flags
Definition: kern_jail.c:127
jailsys_flags::new
unsigned new
Definition: kern_jail.c:130
jailsys_flags::name
const char * name
Definition: kern_jail.c:128
jailsys_flags::disable
unsigned disable
Definition: kern_jail.c:129
in_epoch
int in_epoch(epoch_t epoch)
Definition: subr_epoch.c:942
preload_fetch_size
size_t preload_fetch_size(caddr_t mod)
Definition: subr_module.c:269
preload_search_by_type
caddr_t preload_search_by_type(const char *type)
Definition: subr_module.c:87
preload_fetch_addr
void * preload_fetch_addr(caddr_t mod)
Definition: subr_module.c:258
printf
int printf(const char *fmt,...)
Definition: subr_prf.c:397
snprintf
int snprintf(char *str, size_t size, const char *format,...)
Definition: subr_prf.c:550
flags
uint16_t flags
Definition: subr_stats.c:2
created
sbintime_t created
Definition: subr_stats.c:9
taskqueue_enqueue
int taskqueue_enqueue(struct taskqueue *queue, struct task *task)
Definition: subr_taskqueue.c:277
copyinuio
int copyinuio(const struct iovec *iovp, u_int iovcnt, struct uio **uiop)
Definition: subr_uio.c:365
vn_path_to_global_path
int vn_path_to_global_path(struct thread *td, struct vnode *vp, char *path, u_int pathlen)
Definition: vfs_cache.c:3759
path
const char * path
Definition: vfs_extattr.c:715
vfsconf
struct vfsconfhead vfsconf
Definition: vfs_init.c:70
NDFREE
void() NDFREE(struct nameidata *ndp, const u_int flags)
Definition: vfs_lookup.c:1555
namei
int namei(struct nameidata *ndp)
Definition: vfs_lookup.c:535
vfs_freeopts
void vfs_freeopts(struct vfsoptlist *opts)
Definition: vfs_mount.c:213
vfs_opterror
void vfs_opterror(struct vfsoptlist *opts, const char *fmt,...)
Definition: vfs_mount.c:2299
vfs_copyopt
int vfs_copyopt(struct vfsoptlist *opts, const char *name, void *dest, int len)
Definition: vfs_mount.c:2593
vfs_getopt_pos
int vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
Definition: vfs_mount.c:2401
vfs_flagopt
int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, uint64_t val)
Definition: vfs_mount.c:2480
vfs_setopt_part
int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
Definition: vfs_mount.c:2545
vfs_setopts
int vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
Definition: vfs_mount.c:2567
vfs_setopt
int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
Definition: vfs_mount.c:2524
vfs_getopt
int vfs_getopt(struct vfsoptlist *opts, const char *name, void **buf, int *len)
Definition: vfs_mount.c:2381
vfs_buildopts
int vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
Definition: vfs_mount.c:319
vref
void vref(struct vnode *vp)
Definition: vfs_subr.c:3065
vrele
void vrele(struct vnode *vp)
Definition: vfs_subr.c:3334
vput
void vput(struct vnode *vp)
Definition: vfs_subr.c:3348
buf
struct stat * buf
Definition: vfs_syscalls.c:2423
change_dir
int change_dir(struct vnode *vp, struct thread *td)
Definition: vfs_syscalls.c:1030
flag
int flag
Definition: vfs_syscalls.c:2116