1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Mike Karels at Berkeley Software Design, Inc.
9 *
10 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
11 * project, to make these variables more userfriendly.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #include <sys/cdefs.h>
39 #include "opt_posix.h"
40 #include "opt_config.h"
41
42 #include <sys/param.h>
43 #include <sys/boot.h>
44 #include <sys/elf.h>
45 #include <sys/jail.h>
46 #include <sys/kernel.h>
47 #include <sys/limits.h>
48 #include <sys/lock.h>
49 #include <sys/mutex.h>
50 #include <sys/proc.h>
51 #include <sys/random.h>
52 #include <sys/sbuf.h>
53 #include <sys/smp.h>
54 #include <sys/sx.h>
55 #include <sys/sysent.h>
56 #include <sys/vmmeter.h>
57 #include <sys/sysctl.h>
58 #include <sys/systm.h>
59 #include <sys/unistd.h>
60
61 SYSCTL_ROOT_NODE(0, sysctl, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
62 "Sysctl internal magic");
63 SYSCTL_ROOT_NODE(CTL_KERN, kern, CTLFLAG_RW | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 0,
64 "High kernel, proc, limits &c");
65 SYSCTL_ROOT_NODE(CTL_VM, vm, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
66 "Virtual memory");
67 SYSCTL_ROOT_NODE(CTL_VFS, vfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
68 "File system");
69 SYSCTL_ROOT_NODE(CTL_NET, net, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
70 "Network, (see socket.h)");
71 SYSCTL_ROOT_NODE(CTL_DEBUG, debug, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
72 "Debugging");
73 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
74 "Sizeof various things");
75 SYSCTL_ROOT_NODE(CTL_HW, hw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
76 "hardware");
77 SYSCTL_ROOT_NODE(CTL_MACHDEP, machdep, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
78 "machine dependent");
79 SYSCTL_NODE(_machdep, OID_AUTO, mitigations, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
80 "Machine dependent platform mitigations.");
81 SYSCTL_ROOT_NODE(CTL_USER, user, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
82 "user-level");
83 SYSCTL_ROOT_NODE(CTL_P1003_1B, p1003_1b, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
84 "p1003_1b, (see p1003_1b.h)");
85
86 SYSCTL_ROOT_NODE(OID_AUTO, compat, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
87 "Compatibility code");
88 SYSCTL_ROOT_NODE(OID_AUTO, security, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
89 "Security");
90 #ifdef REGRESSION
91 SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
92 "Regression test MIB");
93 #endif
94
95 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
96 kern_ident, 0, "Kernel identifier");
97
98 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD | CTLFLAG_CAPRD,
99 SYSCTL_NULL_INT_PTR, BSD, "Operating system revision");
100
101 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
102 version, 0, "Kernel version");
103
104 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD,
105 compiler_version, 0, "Version of compiler used to compile kernel");
106
107 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD | CTLFLAG_CAPRD,
108 ostype, 0, "Operating system type");
109
110 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
111 &maxproc, 0, "Maximum number of processes");
112
113 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
114 &maxprocperuid, 0, "Maximum processes allowed per userid");
115
116 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
117 &maxusers, 0, "Hint for kernel tuning");
118
119 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD|CTLFLAG_CAPRD,
120 SYSCTL_NULL_INT_PTR, ARG_MAX, "Maximum bytes of argument to execve(2)");
121
122 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD|CTLFLAG_CAPRD,
123 SYSCTL_NULL_INT_PTR, _POSIX_VERSION, "Version of POSIX attempting to comply to");
124
125 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN |
126 CTLFLAG_NOFETCH | CTLFLAG_CAPRD, &ngroups_max, 0,
127 "Maximum number of supplemental groups a user can belong to");
128
129 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD|CTLFLAG_CAPRD,
130 SYSCTL_NULL_INT_PTR, 1, "Whether job control is available");
131
132 #ifdef _POSIX_SAVED_IDS
133 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
134 SYSCTL_NULL_INT_PTR, 1, "Whether saved set-group/user ID is available");
135 #else
136 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
137 SYSCTL_NULL_INT_PTR, 0, "Whether saved set-group/user ID is available");
138 #endif
139
140 char kernelname[MAXPATHLEN] = PATH_KERNEL; /* XXX bloat */
141
142 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
143 kernelname, sizeof kernelname, "Name of kernel file booted");
144
145 #ifdef COMPAT_FREEBSD12
146 static int
sysctl_maxphys(SYSCTL_HANDLER_ARGS)147 sysctl_maxphys(SYSCTL_HANDLER_ARGS)
148 {
149 u_long lvalue;
150 int ivalue;
151
152 lvalue = maxphys;
153 if (sizeof(int) == sizeof(u_long) || req->oldlen >= sizeof(u_long))
154 return (sysctl_handle_long(oidp, &lvalue, 0, req));
155 if (lvalue > INT_MAX)
156 return (sysctl_handle_long(oidp, &lvalue, 0, req));
157 ivalue = lvalue;
158 return (sysctl_handle_int(oidp, &ivalue, 0, req));
159 }
160 SYSCTL_PROC(_kern, KERN_MAXPHYS, maxphys, CTLTYPE_LONG | CTLFLAG_RDTUN |
161 CTLFLAG_NOFETCH | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
162 NULL, 0, sysctl_maxphys, "UL", "Maximum block I/O access size");
163 #else
164 SYSCTL_ULONG(_kern, KERN_MAXPHYS, maxphys,
165 CTLFLAG_RDTUN | CTLFLAG_NOFETCH | CTLFLAG_CAPRD,
166 &maxphys, 0, "Maximum block I/O access size");
167 #endif
168
169 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD,
170 &mp_ncpus, 0, "Number of active CPUs");
171
172 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD,
173 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order");
174
175 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD,
176 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size");
177
178 static int
sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)179 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
180 {
181 char buf[256];
182 size_t len;
183
184 len = MIN(req->oldlen, sizeof(buf));
185 read_random(buf, len);
186 return (SYSCTL_OUT(req, buf, len));
187 }
188
189 SYSCTL_PROC(_kern, KERN_ARND, arandom,
190 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0,
191 sysctl_kern_arnd, "", "arc4rand");
192
193 static int
sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)194 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
195 {
196 u_long val, p;
197
198 p = SIZE_T_MAX >> PAGE_SHIFT;
199 if (physmem < p)
200 p = physmem;
201 val = ctob(p);
202 return (sysctl_handle_long(oidp, &val, 0, req));
203 }
204 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem,
205 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
206 sysctl_hw_physmem, "LU",
207 "Amount of physical memory (in bytes)");
208
209 static int
sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)210 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
211 {
212 u_long val, p;
213
214 p = SIZE_T_MAX >> PAGE_SHIFT;
215 if (realmem < p)
216 p = realmem;
217 val = ctob(p);
218 return (sysctl_handle_long(oidp, &val, 0, req));
219 }
220 SYSCTL_PROC(_hw, HW_REALMEM, realmem,
221 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
222 sysctl_hw_realmem, "LU",
223 "Amount of memory (in bytes) reported by the firmware");
224
225 static int
sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)226 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
227 {
228 u_long val, p, p1;
229
230 p1 = physmem - vm_wire_count();
231 p = SIZE_T_MAX >> PAGE_SHIFT;
232 if (p1 < p)
233 p = p1;
234 val = ctob(p);
235 return (sysctl_handle_long(oidp, &val, 0, req));
236 }
237 SYSCTL_PROC(_hw, HW_USERMEM, usermem,
238 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
239 sysctl_hw_usermem, "LU",
240 "Amount of memory (in bytes) which is not wired");
241
242 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0,
243 "Amount of physical memory (in pages)");
244
245 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE };
246
247 static int
sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS)248 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS)
249 {
250 int error;
251 size_t len;
252 #ifdef SCTL_MASK32
253 int i;
254 uint32_t pagesizes32[MAXPAGESIZES];
255
256 if (req->flags & SCTL_MASK32) {
257 /*
258 * Recreate the "pagesizes" array with 32-bit elements.
259 * Truncate any page size greater than UINT32_MAX to zero,
260 * which assumes that page sizes are powers of two.
261 */
262 for (i = 0; i < MAXPAGESIZES; i++)
263 pagesizes32[i] = (uint32_t)pagesizes[i];
264
265 len = sizeof(pagesizes32);
266 if (len > req->oldlen && req->oldptr != NULL)
267 len = req->oldlen;
268 error = SYSCTL_OUT(req, pagesizes32, len);
269 } else
270 #endif
271 {
272 len = sizeof(pagesizes);
273 if (len > req->oldlen && req->oldptr != NULL)
274 len = req->oldlen;
275 error = SYSCTL_OUT(req, pagesizes, len);
276 }
277 return (error);
278 }
279 SYSCTL_PROC(_hw, OID_AUTO, pagesizes,
280 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
281 sysctl_hw_pagesizes, "S,pagesizes",
282 "Supported page sizes");
283
284 int adaptive_machine_arch = 1;
285 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW,
286 &adaptive_machine_arch, 1,
287 "Adapt reported machine architecture to the ABI of the binary");
288
289 static const char *
proc_machine_arch(struct proc * p)290 proc_machine_arch(struct proc *p)
291 {
292
293 if (p->p_sysent->sv_machine_arch != NULL)
294 return (p->p_sysent->sv_machine_arch(p));
295 #ifdef COMPAT_FREEBSD32
296 if (SV_PROC_FLAG(p, SV_ILP32))
297 return (MACHINE_ARCH32);
298 #endif
299 return (MACHINE_ARCH);
300 }
301
302 static int
sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS)303 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS)
304 {
305 const char *machine_arch;
306
307 if (adaptive_machine_arch)
308 machine_arch = proc_machine_arch(curproc);
309 else
310 machine_arch = MACHINE_ARCH;
311 return (SYSCTL_OUT(req, machine_arch, strlen(machine_arch) + 1));
312 }
313 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD |
314 CTLFLAG_CAPRD | CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A",
315 "System architecture");
316
317 #ifdef COMPAT_FREEBSD32
318 #include <compat/freebsd32/freebsd32_util.h>
319 #endif
320
321 static int
sysctl_kern_supported_archs(SYSCTL_HANDLER_ARGS)322 sysctl_kern_supported_archs(SYSCTL_HANDLER_ARGS)
323 {
324 const char *supported_archs;
325
326 supported_archs =
327 #ifdef COMPAT_FREEBSD32
328 compat_freebsd_32bit ? MACHINE_ARCH " " MACHINE_ARCH32 :
329 #endif
330 MACHINE_ARCH;
331 return (SYSCTL_OUT(req, supported_archs, strlen(supported_archs) + 1));
332 }
333 SYSCTL_PROC(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE |
334 CTLFLAG_CAPRD | CTLTYPE_STRING, NULL, 0, sysctl_kern_supported_archs, "A",
335 "Supported architectures for binaries");
336
337 static int
sysctl_hostname(SYSCTL_HANDLER_ARGS)338 sysctl_hostname(SYSCTL_HANDLER_ARGS)
339 {
340 struct prison *pr, *cpr;
341 size_t pr_offset;
342 char tmpname[MAXHOSTNAMELEN];
343 int descend, error, len;
344
345 /*
346 * This function can set: hostname domainname hostuuid.
347 * Keep that in mind when comments say "hostname".
348 */
349 pr_offset = (size_t)arg1;
350 len = arg2;
351 KASSERT(len <= sizeof(tmpname),
352 ("length %d too long for %s", len, __func__));
353
354 /*
355 * Make a local copy of hostname to get/set so we don't have to hold
356 * the jail mutex during the sysctl copyin/copyout activities.
357 */
358 pr = req->td->td_ucred->cr_prison;
359 mtx_lock(&pr->pr_mtx);
360 bcopy((char *)pr + pr_offset, tmpname, len);
361 mtx_unlock(&pr->pr_mtx);
362
363 error = sysctl_handle_string(oidp, tmpname, len, req);
364 if (error != 0 || req->newptr == NULL)
365 return (error);
366
367 /*
368 * Copy the locally set hostname to all jails that share
369 * this host info.
370 */
371 sx_slock(&allprison_lock);
372 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME))
373 error = EPERM;
374 else {
375 while (!(pr->pr_flags & PR_HOST))
376 pr = pr->pr_parent;
377 mtx_lock(&pr->pr_mtx);
378 bcopy(tmpname, (char *)pr + pr_offset, len);
379 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
380 if (cpr->pr_flags & PR_HOST)
381 descend = 0;
382 else
383 bcopy(tmpname, (char *)cpr + pr_offset, len);
384 mtx_unlock(&pr->pr_mtx);
385 }
386 sx_sunlock(&allprison_lock);
387 return (error);
388 }
389
390 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
391 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
392 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN,
393 sysctl_hostname, "A", "Hostname");
394 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname,
395 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
396 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN,
397 sysctl_hostname, "A", "Name of the current YP/NIS domain");
398 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid,
399 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
400 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN,
401 sysctl_hostname, "A", "Host UUID");
402
403 static int regression_securelevel_nonmonotonic = 0;
404
405 #ifdef REGRESSION
406 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
407 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
408 #endif
409
410 static int
sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)411 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
412 {
413 struct prison *pr, *cpr;
414 int descend, error, level;
415
416 pr = req->td->td_ucred->cr_prison;
417
418 /*
419 * Reading the securelevel is easy, since the current jail's level
420 * is known to be at least as secure as any higher levels. Perform
421 * a lockless read since the securelevel is an integer.
422 */
423 level = pr->pr_securelevel;
424 error = sysctl_handle_int(oidp, &level, 0, req);
425 if (error || !req->newptr)
426 return (error);
427 /* Permit update only if the new securelevel exceeds the old. */
428 sx_slock(&allprison_lock);
429 mtx_lock(&pr->pr_mtx);
430 if (!regression_securelevel_nonmonotonic &&
431 level < pr->pr_securelevel) {
432 mtx_unlock(&pr->pr_mtx);
433 sx_sunlock(&allprison_lock);
434 return (EPERM);
435 }
436 pr->pr_securelevel = level;
437 /*
438 * Set all child jails to be at least this level, but do not lower
439 * them (even if regression_securelevel_nonmonotonic).
440 */
441 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) {
442 if (cpr->pr_securelevel < level)
443 cpr->pr_securelevel = level;
444 }
445 mtx_unlock(&pr->pr_mtx);
446 sx_sunlock(&allprison_lock);
447 return (error);
448 }
449
450 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
451 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 0, 0,
452 sysctl_kern_securelvl, "I",
453 "Current secure level");
454
455 #ifdef INCLUDE_CONFIG_FILE
456 /* Actual kernel configuration options. */
457 extern char kernconfstring[];
458
459 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD,
460 kernconfstring, 0, "Kernel configuration file");
461 #endif
462
463 static int
sysctl_hostid(SYSCTL_HANDLER_ARGS)464 sysctl_hostid(SYSCTL_HANDLER_ARGS)
465 {
466 struct prison *pr, *cpr;
467 u_long tmpid;
468 int descend, error;
469
470 /*
471 * Like sysctl_hostname, except it operates on a u_long
472 * instead of a string, and is used only for hostid.
473 */
474 pr = req->td->td_ucred->cr_prison;
475 mtx_lock(&pr->pr_mtx);
476 tmpid = pr->pr_hostid;
477 mtx_unlock(&pr->pr_mtx);
478
479 error = sysctl_handle_long(oidp, &tmpid, 0, req);
480 if (error != 0 || req->newptr == NULL)
481 return (error);
482
483 sx_slock(&allprison_lock);
484 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME))
485 error = EPERM;
486 else {
487 while (!(pr->pr_flags & PR_HOST))
488 pr = pr->pr_parent;
489 mtx_lock(&pr->pr_mtx);
490 pr->pr_hostid = tmpid;
491 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
492 if (cpr->pr_flags & PR_HOST)
493 descend = 0;
494 else
495 cpr->pr_hostid = tmpid;
496 mtx_unlock(&pr->pr_mtx);
497 }
498 sx_sunlock(&allprison_lock);
499 return (error);
500 }
501
502 SYSCTL_PROC(_kern, KERN_HOSTID, hostid,
503 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD,
504 NULL, 0, sysctl_hostid, "LU", "Host ID");
505
506 static struct mtx bootid_lk;
507 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF);
508
509 static int
sysctl_bootid(SYSCTL_HANDLER_ARGS)510 sysctl_bootid(SYSCTL_HANDLER_ARGS)
511 {
512 static uint8_t boot_id[16];
513 static bool initialized = false;
514
515 mtx_lock(&bootid_lk);
516 if (!initialized) {
517 if (!is_random_seeded()) {
518 mtx_unlock(&bootid_lk);
519 return (ENXIO);
520 }
521 arc4random_buf(boot_id, sizeof(boot_id));
522 initialized = true;
523 }
524 mtx_unlock(&bootid_lk);
525
526 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id)));
527 }
528 SYSCTL_PROC(_kern, OID_AUTO, boot_id,
529 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD,
530 NULL, 0, sysctl_bootid, "", "Random boot ID");
531
532 /*
533 * The osrelease string is copied from the global (osrelease in vers.c) into
534 * prison0 by a sysinit and is inherited by child jails if not changed at jail
535 * creation, so we always return the copy from the current prison data.
536 */
537 static int
sysctl_osrelease(SYSCTL_HANDLER_ARGS)538 sysctl_osrelease(SYSCTL_HANDLER_ARGS)
539 {
540 struct prison *pr;
541
542 pr = req->td->td_ucred->cr_prison;
543 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1));
544
545 }
546
547 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease,
548 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
549 NULL, 0, sysctl_osrelease, "A", "Operating system release");
550
551 /*
552 * The osreldate number is copied from the global (osreldate in vers.c) into
553 * prison0 by a sysinit and is inherited by child jails if not changed at jail
554 * creation, so we always return the value from the current prison data.
555 */
556 static int
sysctl_osreldate(SYSCTL_HANDLER_ARGS)557 sysctl_osreldate(SYSCTL_HANDLER_ARGS)
558 {
559 struct prison *pr;
560
561 pr = req->td->td_ucred->cr_prison;
562 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate)));
563
564 }
565
566 /*
567 * NOTICE: The *userland* release date is available in
568 * /usr/include/osreldate.h
569 */
570 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate,
571 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
572 NULL, 0, sysctl_osreldate, "I", "Kernel release date");
573
574 /*
575 * The build-id is copied from the ELF section .note.gnu.build-id. The linker
576 * script defines two variables to expose the beginning and end. LLVM
577 * currently uses a SHA-1 hash, but other formats can be supported by checking
578 * the length of the section.
579 */
580
581 extern char __build_id_start[];
582 extern char __build_id_end[];
583
584 #define BUILD_ID_HEADER_LEN 0x10
585 #define BUILD_ID_HASH_MAXLEN 0x14
586
587 static int
sysctl_build_id(SYSCTL_HANDLER_ARGS)588 sysctl_build_id(SYSCTL_HANDLER_ARGS)
589 {
590 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start);
591 int hashlen;
592 char buf[2*BUILD_ID_HASH_MAXLEN+1];
593
594 /*
595 * The ELF note section has a four byte length for the vendor name,
596 * four byte length for the value, and a four byte vendor specific
597 * type. The name for the build id is "GNU\0". We skip the first 16
598 * bytes to read the build hash. We will return the remaining bytes up
599 * to 20 (SHA-1) hash size. If the hash happens to be a custom number
600 * of bytes we will pad the value with zeros, as the section should be
601 * four byte aligned.
602 */
603 if (sectionlen <= BUILD_ID_HEADER_LEN ||
604 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) {
605 return (ENOENT);
606 }
607
608 hashlen = sectionlen - BUILD_ID_HEADER_LEN;
609 for (int i = 0; i < hashlen; i++) {
610 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN];
611 snprintf(&buf[2*i], 3, "%02x", c);
612 }
613
614 return (SYSCTL_OUT(req, buf, strlen(buf) + 1));
615 }
616
617 SYSCTL_PROC(_kern, OID_AUTO, build_id,
618 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
619 NULL, 0, sysctl_build_id, "A", "Operating system build-id");
620
621 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
622 "Kernel Features");
623
624 #ifdef COMPAT_FREEBSD4
625 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
626 #endif
627
628 #ifdef COMPAT_FREEBSD5
629 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
630 #endif
631
632 #ifdef COMPAT_FREEBSD6
633 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
634 #endif
635
636 #ifdef COMPAT_FREEBSD7
637 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
638 #endif
639
640 #ifdef COMPAT_FREEBSD8
641 FEATURE(compat_freebsd8, "Compatible with FreeBSD 8");
642 #endif
643
644 #ifdef COMPAT_FREEBSD9
645 FEATURE(compat_freebsd9, "Compatible with FreeBSD 9");
646 #endif
647
648 #ifdef COMPAT_FREEBSD10
649 FEATURE(compat_freebsd10, "Compatible with FreeBSD 10");
650 #endif
651
652 #ifdef COMPAT_FREEBSD11
653 FEATURE(compat_freebsd11, "Compatible with FreeBSD 11");
654 #endif
655
656 #ifdef COMPAT_FREEBSD12
657 FEATURE(compat_freebsd12, "Compatible with FreeBSD 12");
658 #endif
659
660 #ifdef COMPAT_FREEBSD13
661 FEATURE(compat_freebsd13, "Compatible with FreeBSD 13");
662 #endif
663
664 #ifdef COMPAT_FREEBSD14
665 FEATURE(compat_freebsd14, "Compatible with FreeBSD 14");
666 #endif
667
668 /*
669 * This is really cheating. These actually live in the libc, something
670 * which I'm not quite sure is a good idea anyway, but in order for
671 * getnext and friends to actually work, we define dummies here.
672 *
673 * XXXRW: These probably should be CTLFLAG_CAPRD.
674 */
675 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
676 "", 0, "PATH that finds all the standard utilities");
677 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
678 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)");
679 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
680 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)");
681 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
682 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)");
683 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
684 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)");
685 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
686 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
687 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD,
688 SYSCTL_NULL_INT_PTR, 0, "");
689 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
690 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line");
691 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
692 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted");
693 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
694 SYSCTL_NULL_INT_PTR, 0,
695 "The version of POSIX 1003.2 with which the system attempts to comply");
696 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
697 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option");
698 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
699 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option");
700 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
701 SYSCTL_NULL_INT_PTR, 0, "");
702 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
703 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities");
704 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
705 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities");
706 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
707 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales");
708 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
709 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities");
710 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
711 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities");
712 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
713 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time");
714 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
715 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names");
716
717 static char localbase[MAXPATHLEN] = "";
718
719 SYSCTL_STRING(_user, USER_LOCALBASE, localbase, CTLFLAG_RWTUN,
720 localbase, sizeof(localbase), "Prefix used to install and locate add-on packages");
721
722 #include <sys/vnode.h>
723 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
724 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)");
725
726 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
727 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)");
728
729 static int
sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS)730 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS)
731 {
732 int error, pm;
733
734 pm = pid_max;
735 error = sysctl_handle_int(oidp, &pm, 0, req);
736 if (error || !req->newptr)
737 return (error);
738 sx_xlock(&proctree_lock);
739 sx_xlock(&allproc_lock);
740
741 /*
742 * Only permit the values less then PID_MAX.
743 * As a safety measure, do not allow to limit the pid_max too much.
744 */
745 if (pm < 300 || pm > PID_MAX)
746 error = EINVAL;
747 else
748 pid_max = pm;
749 sx_xunlock(&allproc_lock);
750 sx_xunlock(&proctree_lock);
751 return (error);
752 }
753 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT |
754 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE,
755 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid");
756
757 SYSCTL_INT(_kern, OID_AUTO, pid_max_limit, CTLFLAG_RD,
758 SYSCTL_NULL_INT_PTR, PID_MAX,
759 "Maximum allowed pid (kern.pid_max) top limit");
760
761 #include <sys/bio.h>
762 #include <sys/buf.h>
763 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
764 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)");
765 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
766 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)");
767
768 #include <sys/user.h>
769 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
770 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
771
772 /* Used by kernel debuggers. */
773 const int pcb_size = sizeof(struct pcb);
774 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD,
775 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)");
776
777 /* XXX compatibility, remove for 6.0 */
778 #include <sys/imgact.h>
779 #include <sys/imgact_elf.h>
780 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
781 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
782 "compatibility for kern.fallback_elf_brand");
783