2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Mike Karels at Berkeley Software Design, Inc.
10 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
11 * project, to make these variables more userfriendly.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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
37 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
40 #include <sys/cdefs.h>
41 #include "opt_posix.h"
42 #include "opt_config.h"
44 #include <sys/param.h>
48 #include <sys/kernel.h>
49 #include <sys/limits.h>
51 #include <sys/mutex.h>
53 #include <sys/random.h>
57 #include <sys/sysent.h>
58 #include <sys/vmmeter.h>
59 #include <sys/sysctl.h>
60 #include <sys/systm.h>
61 #include <sys/unistd.h>
63 SYSCTL_ROOT_NODE(0, sysctl, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
64 "Sysctl internal magic");
65 SYSCTL_ROOT_NODE(CTL_KERN, kern, CTLFLAG_RW | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 0,
66 "High kernel, proc, limits &c");
67 SYSCTL_ROOT_NODE(CTL_VM, vm, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
69 SYSCTL_ROOT_NODE(CTL_VFS, vfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
71 SYSCTL_ROOT_NODE(CTL_NET, net, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
72 "Network, (see socket.h)");
73 SYSCTL_ROOT_NODE(CTL_DEBUG, debug, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
75 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
76 "Sizeof various things");
77 SYSCTL_ROOT_NODE(CTL_HW, hw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
79 SYSCTL_ROOT_NODE(CTL_MACHDEP, machdep, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
81 SYSCTL_NODE(_machdep, OID_AUTO, mitigations, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
82 "Machine dependent platform mitigations.");
83 SYSCTL_ROOT_NODE(CTL_USER, user, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
85 SYSCTL_ROOT_NODE(CTL_P1003_1B, p1003_1b, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
86 "p1003_1b, (see p1003_1b.h)");
88 SYSCTL_ROOT_NODE(OID_AUTO, compat, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
89 "Compatibility code");
90 SYSCTL_ROOT_NODE(OID_AUTO, security, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
93 SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
94 "Regression test MIB");
97 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE,
98 kern_ident, 0, "Kernel identifier");
100 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD|CTLFLAG_CAPRD,
101 SYSCTL_NULL_INT_PTR, BSD, "Operating system revision");
103 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE,
104 version, 0, "Kernel version");
106 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD|CTLFLAG_MPSAFE,
107 compiler_version, 0, "Version of compiler used to compile kernel");
109 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE|
110 CTLFLAG_CAPRD, ostype, 0, "Operating system type");
112 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
113 &maxproc, 0, "Maximum number of processes");
115 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
116 &maxprocperuid, 0, "Maximum processes allowed per userid");
118 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
119 &maxusers, 0, "Hint for kernel tuning");
121 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD|CTLFLAG_CAPRD,
122 SYSCTL_NULL_INT_PTR, ARG_MAX, "Maximum bytes of argument to execve(2)");
124 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD|CTLFLAG_CAPRD,
125 SYSCTL_NULL_INT_PTR, _POSIX_VERSION, "Version of POSIX attempting to comply to");
127 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN |
128 CTLFLAG_NOFETCH | CTLFLAG_CAPRD, &ngroups_max, 0,
129 "Maximum number of supplemental groups a user can belong to");
131 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD|CTLFLAG_CAPRD,
132 SYSCTL_NULL_INT_PTR, 1, "Whether job control is available");
134 #ifdef _POSIX_SAVED_IDS
135 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
136 SYSCTL_NULL_INT_PTR, 1, "Whether saved set-group/user ID is available");
138 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
139 SYSCTL_NULL_INT_PTR, 0, "Whether saved set-group/user ID is available");
142 char kernelname[MAXPATHLEN] = PATH_KERNEL; /* XXX bloat */
144 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW | CTLFLAG_MPSAFE,
145 kernelname, sizeof kernelname, "Name of kernel file booted");
147 #ifdef COMPAT_FREEBSD12
149 sysctl_maxphys(SYSCTL_HANDLER_ARGS)
155 if (sizeof(int) == sizeof(u_long) || req->oldlen >= sizeof(u_long))
156 return (sysctl_handle_long(oidp, &lvalue, 0, req));
157 if (lvalue > INT_MAX)
158 return (sysctl_handle_long(oidp, &lvalue, 0, req));
160 return (sysctl_handle_int(oidp, &ivalue, 0, req));
162 SYSCTL_PROC(_kern, KERN_MAXPHYS, maxphys, CTLTYPE_LONG | CTLFLAG_RDTUN |
163 CTLFLAG_NOFETCH | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
164 NULL, 0, sysctl_maxphys, "UL", "Maximum block I/O access size");
166 SYSCTL_ULONG(_kern, KERN_MAXPHYS, maxphys,
167 CTLFLAG_RDTUN | CTLFLAG_NOFETCH | CTLFLAG_CAPRD,
168 &maxphys, 0, "Maximum block I/O access size");
171 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD,
172 &mp_ncpus, 0, "Number of active CPUs");
174 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD,
175 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order");
177 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD,
178 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size");
181 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
186 len = MIN(req->oldlen, sizeof(buf));
187 read_random(buf, len);
188 return (SYSCTL_OUT(req, buf, len));
191 SYSCTL_PROC(_kern, KERN_ARND, arandom,
192 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0,
193 sysctl_kern_arnd, "", "arc4rand");
196 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
200 p = SIZE_T_MAX >> PAGE_SHIFT;
204 return (sysctl_handle_long(oidp, &val, 0, req));
206 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem,
207 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
208 sysctl_hw_physmem, "LU",
209 "Amount of physical memory (in bytes)");
212 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
216 p = SIZE_T_MAX >> PAGE_SHIFT;
220 return (sysctl_handle_long(oidp, &val, 0, req));
222 SYSCTL_PROC(_hw, HW_REALMEM, realmem,
223 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
224 sysctl_hw_realmem, "LU",
225 "Amount of memory (in bytes) reported by the firmware");
228 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
232 p1 = physmem - vm_wire_count();
233 p = SIZE_T_MAX >> PAGE_SHIFT;
237 return (sysctl_handle_long(oidp, &val, 0, req));
239 SYSCTL_PROC(_hw, HW_USERMEM, usermem,
240 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
241 sysctl_hw_usermem, "LU",
242 "Amount of memory (in bytes) which is not wired");
244 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0,
245 "Amount of physical memory (in pages)");
247 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE };
250 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS)
256 uint32_t pagesizes32[MAXPAGESIZES];
258 if (req->flags & SCTL_MASK32) {
260 * Recreate the "pagesizes" array with 32-bit elements.
261 * Truncate any page size greater than UINT32_MAX to zero,
262 * which assumes that page sizes are powers of two.
264 for (i = 0; i < MAXPAGESIZES; i++)
265 pagesizes32[i] = (uint32_t)pagesizes[i];
267 len = sizeof(pagesizes32);
268 if (len > req->oldlen && req->oldptr != NULL)
270 error = SYSCTL_OUT(req, pagesizes32, len);
274 len = sizeof(pagesizes);
275 if (len > req->oldlen && req->oldptr != NULL)
277 error = SYSCTL_OUT(req, pagesizes, len);
281 SYSCTL_PROC(_hw, OID_AUTO, pagesizes,
282 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
283 sysctl_hw_pagesizes, "S,pagesizes",
284 "Supported page sizes");
286 int adaptive_machine_arch = 1;
287 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW,
288 &adaptive_machine_arch, 1,
289 "Adapt reported machine architecture to the ABI of the binary");
292 proc_machine_arch(struct proc *p)
295 if (p->p_sysent->sv_machine_arch != NULL)
296 return (p->p_sysent->sv_machine_arch(p));
297 #ifdef COMPAT_FREEBSD32
298 if (SV_PROC_FLAG(p, SV_ILP32))
299 return (MACHINE_ARCH32);
301 return (MACHINE_ARCH);
305 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS)
307 const char *machine_arch;
309 if (adaptive_machine_arch)
310 machine_arch = proc_machine_arch(curproc);
312 machine_arch = MACHINE_ARCH;
313 return (SYSCTL_OUT(req, machine_arch, strlen(machine_arch) + 1));
315 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD |
316 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A",
317 "System architecture");
319 #ifndef MACHINE_ARCHES
320 #ifdef COMPAT_FREEBSD32
321 #define MACHINE_ARCHES MACHINE_ARCH " " MACHINE_ARCH32
323 #define MACHINE_ARCHES MACHINE_ARCH
327 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE,
328 MACHINE_ARCHES, 0, "Supported architectures for binaries");
331 sysctl_hostname(SYSCTL_HANDLER_ARGS)
333 struct prison *pr, *cpr;
335 char tmpname[MAXHOSTNAMELEN];
336 int descend, error, len;
339 * This function can set: hostname domainname hostuuid.
340 * Keep that in mind when comments say "hostname".
342 pr_offset = (size_t)arg1;
344 KASSERT(len <= sizeof(tmpname),
345 ("length %d too long for %s", len, __func__));
348 * Make a local copy of hostname to get/set so we don't have to hold
349 * the jail mutex during the sysctl copyin/copyout activities.
351 pr = req->td->td_ucred->cr_prison;
352 mtx_lock(&pr->pr_mtx);
353 bcopy((char *)pr + pr_offset, tmpname, len);
354 mtx_unlock(&pr->pr_mtx);
356 error = sysctl_handle_string(oidp, tmpname, len, req);
357 if (error != 0 || req->newptr == NULL)
361 * Copy the locally set hostname to all jails that share
364 sx_slock(&allprison_lock);
365 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME))
368 while (!(pr->pr_flags & PR_HOST))
370 mtx_lock(&pr->pr_mtx);
371 bcopy(tmpname, (char *)pr + pr_offset, len);
372 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
373 if (cpr->pr_flags & PR_HOST)
376 bcopy(tmpname, (char *)cpr + pr_offset, len);
377 mtx_unlock(&pr->pr_mtx);
379 sx_sunlock(&allprison_lock);
383 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
384 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
385 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN,
386 sysctl_hostname, "A", "Hostname");
387 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname,
388 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
389 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN,
390 sysctl_hostname, "A", "Name of the current YP/NIS domain");
391 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid,
392 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
393 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN,
394 sysctl_hostname, "A", "Host UUID");
396 static int regression_securelevel_nonmonotonic = 0;
399 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
400 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
404 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
406 struct prison *pr, *cpr;
407 int descend, error, level;
409 pr = req->td->td_ucred->cr_prison;
412 * Reading the securelevel is easy, since the current jail's level
413 * is known to be at least as secure as any higher levels. Perform
414 * a lockless read since the securelevel is an integer.
416 level = pr->pr_securelevel;
417 error = sysctl_handle_int(oidp, &level, 0, req);
418 if (error || !req->newptr)
420 /* Permit update only if the new securelevel exceeds the old. */
421 sx_slock(&allprison_lock);
422 mtx_lock(&pr->pr_mtx);
423 if (!regression_securelevel_nonmonotonic &&
424 level < pr->pr_securelevel) {
425 mtx_unlock(&pr->pr_mtx);
426 sx_sunlock(&allprison_lock);
429 pr->pr_securelevel = level;
431 * Set all child jails to be at least this level, but do not lower
432 * them (even if regression_securelevel_nonmonotonic).
434 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) {
435 if (cpr->pr_securelevel < level)
436 cpr->pr_securelevel = level;
438 mtx_unlock(&pr->pr_mtx);
439 sx_sunlock(&allprison_lock);
443 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
444 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 0, 0,
445 sysctl_kern_securelvl, "I",
446 "Current secure level");
448 #ifdef INCLUDE_CONFIG_FILE
449 /* Actual kernel configuration options. */
450 extern char kernconfstring[];
452 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE,
453 kernconfstring, 0, "Kernel configuration file");
457 sysctl_hostid(SYSCTL_HANDLER_ARGS)
459 struct prison *pr, *cpr;
464 * Like sysctl_hostname, except it operates on a u_long
465 * instead of a string, and is used only for hostid.
467 pr = req->td->td_ucred->cr_prison;
468 mtx_lock(&pr->pr_mtx);
469 tmpid = pr->pr_hostid;
470 mtx_unlock(&pr->pr_mtx);
472 error = sysctl_handle_long(oidp, &tmpid, 0, req);
473 if (error != 0 || req->newptr == NULL)
476 sx_slock(&allprison_lock);
477 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME))
480 while (!(pr->pr_flags & PR_HOST))
482 mtx_lock(&pr->pr_mtx);
483 pr->pr_hostid = tmpid;
484 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
485 if (cpr->pr_flags & PR_HOST)
488 cpr->pr_hostid = tmpid;
489 mtx_unlock(&pr->pr_mtx);
491 sx_sunlock(&allprison_lock);
495 SYSCTL_PROC(_kern, KERN_HOSTID, hostid,
496 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD,
497 NULL, 0, sysctl_hostid, "LU", "Host ID");
499 static struct mtx bootid_lk;
500 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF);
503 sysctl_bootid(SYSCTL_HANDLER_ARGS)
505 static uint8_t boot_id[16];
506 static bool initialized = false;
508 mtx_lock(&bootid_lk);
510 if (!is_random_seeded()) {
511 mtx_unlock(&bootid_lk);
514 arc4random_buf(boot_id, sizeof(boot_id));
517 mtx_unlock(&bootid_lk);
519 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id)));
521 SYSCTL_PROC(_kern, OID_AUTO, boot_id,
522 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD,
523 NULL, 0, sysctl_bootid, "", "Random boot ID");
526 * The osrelease string is copied from the global (osrelease in vers.c) into
527 * prison0 by a sysinit and is inherited by child jails if not changed at jail
528 * creation, so we always return the copy from the current prison data.
531 sysctl_osrelease(SYSCTL_HANDLER_ARGS)
535 pr = req->td->td_ucred->cr_prison;
536 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1));
540 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease,
541 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
542 NULL, 0, sysctl_osrelease, "A", "Operating system release");
545 * The osreldate number is copied from the global (osreldate in vers.c) into
546 * prison0 by a sysinit and is inherited by child jails if not changed at jail
547 * creation, so we always return the value from the current prison data.
550 sysctl_osreldate(SYSCTL_HANDLER_ARGS)
554 pr = req->td->td_ucred->cr_prison;
555 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate)));
560 * NOTICE: The *userland* release date is available in
561 * /usr/include/osreldate.h
563 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate,
564 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
565 NULL, 0, sysctl_osreldate, "I", "Kernel release date");
568 * The build-id is copied from the ELF section .note.gnu.build-id. The linker
569 * script defines two variables to expose the beginning and end. LLVM
570 * currently uses a SHA-1 hash, but other formats can be supported by checking
571 * the length of the section.
574 extern char __build_id_start[];
575 extern char __build_id_end[];
577 #define BUILD_ID_HEADER_LEN 0x10
578 #define BUILD_ID_HASH_MAXLEN 0x14
581 sysctl_build_id(SYSCTL_HANDLER_ARGS)
583 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start);
585 char buf[2*BUILD_ID_HASH_MAXLEN+1];
588 * The ELF note section has a four byte length for the vendor name,
589 * four byte length for the value, and a four byte vendor specific
590 * type. The name for the build id is "GNU\0". We skip the first 16
591 * bytes to read the build hash. We will return the remaining bytes up
592 * to 20 (SHA-1) hash size. If the hash happens to be a custom number
593 * of bytes we will pad the value with zeros, as the section should be
596 if (sectionlen <= BUILD_ID_HEADER_LEN ||
597 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) {
601 hashlen = sectionlen - BUILD_ID_HEADER_LEN;
602 for (int i = 0; i < hashlen; i++) {
603 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN];
604 snprintf(&buf[2*i], 3, "%02x", c);
607 return (SYSCTL_OUT(req, buf, strlen(buf) + 1));
610 SYSCTL_PROC(_kern, OID_AUTO, build_id,
611 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
612 NULL, 0, sysctl_build_id, "A", "Operating system build-id");
614 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
617 #ifdef COMPAT_FREEBSD4
618 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
621 #ifdef COMPAT_FREEBSD5
622 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
625 #ifdef COMPAT_FREEBSD6
626 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
629 #ifdef COMPAT_FREEBSD7
630 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
634 * This is really cheating. These actually live in the libc, something
635 * which I'm not quite sure is a good idea anyway, but in order for
636 * getnext and friends to actually work, we define dummies here.
638 * XXXRW: These probably should be CTLFLAG_CAPRD.
640 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
641 "", 0, "PATH that finds all the standard utilities");
642 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
643 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)");
644 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
645 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)");
646 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
647 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)");
648 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
649 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)");
650 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
651 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
652 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD,
653 SYSCTL_NULL_INT_PTR, 0, "");
654 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
655 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line");
656 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
657 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted");
658 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
659 SYSCTL_NULL_INT_PTR, 0,
660 "The version of POSIX 1003.2 with which the system attempts to comply");
661 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
662 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option");
663 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
664 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option");
665 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
666 SYSCTL_NULL_INT_PTR, 0, "");
667 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
668 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities");
669 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
670 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities");
671 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
672 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales");
673 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
674 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities");
675 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
676 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities");
677 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
678 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time");
679 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
680 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names");
682 static char localbase[MAXPATHLEN] = "";
684 SYSCTL_STRING(_user, USER_LOCALBASE, localbase, CTLFLAG_RWTUN,
685 localbase, sizeof(localbase), "Prefix used to install and locate add-on packages");
687 #include <sys/vnode.h>
688 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
689 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)");
691 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
692 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)");
695 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS)
700 error = sysctl_handle_int(oidp, &pm, 0, req);
701 if (error || !req->newptr)
703 sx_xlock(&proctree_lock);
704 sx_xlock(&allproc_lock);
707 * Only permit the values less then PID_MAX.
708 * As a safety measure, do not allow to limit the pid_max too much.
710 if (pm < 300 || pm > PID_MAX)
714 sx_xunlock(&allproc_lock);
715 sx_xunlock(&proctree_lock);
718 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT |
719 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE,
720 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid");
724 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
725 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)");
726 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
727 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)");
729 #include <sys/user.h>
730 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
731 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
733 /* Used by kernel debuggers. */
734 const int pcb_size = sizeof(struct pcb);
735 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD,
736 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)");
738 /* XXX compatibility, remove for 6.0 */
739 #include <sys/imgact.h>
740 #include <sys/imgact_elf.h>
741 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
742 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
743 "compatibility for kern.fallback_elf_brand");