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 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_posix.h" 44 #include "opt_config.h" 45 46 #include <sys/param.h> 47 #include <sys/boot.h> 48 #include <sys/elf.h> 49 #include <sys/jail.h> 50 #include <sys/kernel.h> 51 #include <sys/limits.h> 52 #include <sys/lock.h> 53 #include <sys/mutex.h> 54 #include <sys/proc.h> 55 #include <sys/random.h> 56 #include <sys/sbuf.h> 57 #include <sys/smp.h> 58 #include <sys/sx.h> 59 #include <sys/sysent.h> 60 #include <sys/vmmeter.h> 61 #include <sys/sysctl.h> 62 #include <sys/systm.h> 63 #include <sys/unistd.h> 64 65 SYSCTL_ROOT_NODE(0, sysctl, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 66 "Sysctl internal magic"); 67 SYSCTL_ROOT_NODE(CTL_KERN, kern, CTLFLAG_RW | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 0, 68 "High kernel, proc, limits &c"); 69 SYSCTL_ROOT_NODE(CTL_VM, vm, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 70 "Virtual memory"); 71 SYSCTL_ROOT_NODE(CTL_VFS, vfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 72 "File system"); 73 SYSCTL_ROOT_NODE(CTL_NET, net, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 74 "Network, (see socket.h)"); 75 SYSCTL_ROOT_NODE(CTL_DEBUG, debug, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 76 "Debugging"); 77 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 78 "Sizeof various things"); 79 SYSCTL_ROOT_NODE(CTL_HW, hw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 80 "hardware"); 81 SYSCTL_ROOT_NODE(CTL_MACHDEP, machdep, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 82 "machine dependent"); 83 SYSCTL_NODE(_machdep, OID_AUTO, mitigations, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 84 "Machine dependent platform mitigations."); 85 SYSCTL_ROOT_NODE(CTL_USER, user, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 86 "user-level"); 87 SYSCTL_ROOT_NODE(CTL_P1003_1B, p1003_1b, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 88 "p1003_1b, (see p1003_1b.h)"); 89 90 SYSCTL_ROOT_NODE(OID_AUTO, compat, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 91 "Compatibility code"); 92 SYSCTL_ROOT_NODE(OID_AUTO, security, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 93 "Security"); 94 #ifdef REGRESSION 95 SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 96 "Regression test MIB"); 97 #endif 98 99 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE, 100 kern_ident, 0, "Kernel identifier"); 101 102 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD|CTLFLAG_CAPRD, 103 SYSCTL_NULL_INT_PTR, BSD, "Operating system revision"); 104 105 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE, 106 version, 0, "Kernel version"); 107 108 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD|CTLFLAG_MPSAFE, 109 compiler_version, 0, "Version of compiler used to compile kernel"); 110 111 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE| 112 CTLFLAG_CAPRD, ostype, 0, "Operating system type"); 113 114 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, 115 &maxproc, 0, "Maximum number of processes"); 116 117 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 118 &maxprocperuid, 0, "Maximum processes allowed per userid"); 119 120 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, 121 &maxusers, 0, "Hint for kernel tuning"); 122 123 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD|CTLFLAG_CAPRD, 124 SYSCTL_NULL_INT_PTR, ARG_MAX, "Maximum bytes of argument to execve(2)"); 125 126 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD|CTLFLAG_CAPRD, 127 SYSCTL_NULL_INT_PTR, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 128 129 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN | 130 CTLFLAG_NOFETCH | CTLFLAG_CAPRD, &ngroups_max, 0, 131 "Maximum number of supplemental groups a user can belong to"); 132 133 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD|CTLFLAG_CAPRD, 134 SYSCTL_NULL_INT_PTR, 1, "Whether job control is available"); 135 136 #ifdef _POSIX_SAVED_IDS 137 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD, 138 SYSCTL_NULL_INT_PTR, 1, "Whether saved set-group/user ID is available"); 139 #else 140 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD, 141 SYSCTL_NULL_INT_PTR, 0, "Whether saved set-group/user ID is available"); 142 #endif 143 144 char kernelname[MAXPATHLEN] = PATH_KERNEL; /* XXX bloat */ 145 146 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW | CTLFLAG_MPSAFE, 147 kernelname, sizeof kernelname, "Name of kernel file booted"); 148 149 SYSCTL_INT(_kern, KERN_MAXPHYS, maxphys, CTLFLAG_RD | CTLFLAG_CAPRD, 150 SYSCTL_NULL_INT_PTR, MAXPHYS, "Maximum block I/O access size"); 151 152 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD, 153 &mp_ncpus, 0, "Number of active CPUs"); 154 155 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD, 156 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order"); 157 158 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD, 159 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size"); 160 161 static int 162 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 163 { 164 char buf[256]; 165 size_t len; 166 167 len = MIN(req->oldlen, sizeof(buf)); 168 read_random(buf, len); 169 return (SYSCTL_OUT(req, buf, len)); 170 } 171 172 SYSCTL_PROC(_kern, KERN_ARND, arandom, 173 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0, 174 sysctl_kern_arnd, "", "arc4rand"); 175 176 static int 177 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 178 { 179 u_long val, p; 180 181 p = SIZE_T_MAX >> PAGE_SHIFT; 182 if (physmem < p) 183 p = physmem; 184 val = ctob(p); 185 return (sysctl_handle_long(oidp, &val, 0, req)); 186 } 187 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, 188 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 189 sysctl_hw_physmem, "LU", 190 "Amount of physical memory (in bytes)"); 191 192 static int 193 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 194 { 195 u_long val, p; 196 197 p = SIZE_T_MAX >> PAGE_SHIFT; 198 if (realmem < p) 199 p = realmem; 200 val = ctob(p); 201 return (sysctl_handle_long(oidp, &val, 0, req)); 202 } 203 SYSCTL_PROC(_hw, HW_REALMEM, realmem, 204 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 205 sysctl_hw_realmem, "LU", 206 "Amount of memory (in bytes) reported by the firmware"); 207 208 static int 209 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 210 { 211 u_long val, p, p1; 212 213 p1 = physmem - vm_wire_count(); 214 p = SIZE_T_MAX >> PAGE_SHIFT; 215 if (p1 < p) 216 p = p1; 217 val = ctob(p); 218 return (sysctl_handle_long(oidp, &val, 0, req)); 219 } 220 SYSCTL_PROC(_hw, HW_USERMEM, usermem, 221 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 222 sysctl_hw_usermem, "LU", 223 "Amount of memory (in bytes) which is not wired"); 224 225 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, 226 "Amount of physical memory (in pages)"); 227 228 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE }; 229 230 static int 231 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS) 232 { 233 int error; 234 size_t len; 235 #ifdef SCTL_MASK32 236 int i; 237 uint32_t pagesizes32[MAXPAGESIZES]; 238 239 if (req->flags & SCTL_MASK32) { 240 /* 241 * Recreate the "pagesizes" array with 32-bit elements. Truncate 242 * any page size greater than UINT32_MAX to zero. 243 */ 244 for (i = 0; i < MAXPAGESIZES; i++) 245 pagesizes32[i] = (uint32_t)pagesizes[i]; 246 247 len = sizeof(pagesizes32); 248 if (len > req->oldlen) 249 len = req->oldlen; 250 error = SYSCTL_OUT(req, pagesizes32, len); 251 } else 252 #endif 253 { 254 len = sizeof(pagesizes); 255 if (len > req->oldlen) 256 len = req->oldlen; 257 error = SYSCTL_OUT(req, pagesizes, len); 258 } 259 return (error); 260 } 261 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, 262 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 263 sysctl_hw_pagesizes, "LU", 264 "Supported page sizes"); 265 266 int adaptive_machine_arch = 1; 267 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 268 &adaptive_machine_arch, 1, 269 "Adapt reported machine architecture to the ABI of the binary"); 270 271 static const char * 272 proc_machine_arch(struct proc *p) 273 { 274 275 if (p->p_sysent->sv_machine_arch != NULL) 276 return (p->p_sysent->sv_machine_arch(p)); 277 #ifdef COMPAT_FREEBSD32 278 if (SV_PROC_FLAG(p, SV_ILP32)) 279 return (MACHINE_ARCH32); 280 #endif 281 return (MACHINE_ARCH); 282 } 283 284 static int 285 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 286 { 287 const char *machine_arch; 288 289 if (adaptive_machine_arch) 290 machine_arch = proc_machine_arch(curproc); 291 else 292 machine_arch = MACHINE_ARCH; 293 return (SYSCTL_OUT(req, machine_arch, strlen(machine_arch) + 1)); 294 } 295 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 296 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 297 "System architecture"); 298 299 #ifndef MACHINE_ARCHES 300 #ifdef COMPAT_FREEBSD32 301 #define MACHINE_ARCHES MACHINE_ARCH " " MACHINE_ARCH32 302 #else 303 #define MACHINE_ARCHES MACHINE_ARCH 304 #endif 305 #endif 306 307 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE, 308 MACHINE_ARCHES, 0, "Supported architectures for binaries"); 309 310 static int 311 sysctl_hostname(SYSCTL_HANDLER_ARGS) 312 { 313 struct prison *pr, *cpr; 314 size_t pr_offset; 315 char tmpname[MAXHOSTNAMELEN]; 316 int descend, error, len; 317 318 /* 319 * This function can set: hostname domainname hostuuid. 320 * Keep that in mind when comments say "hostname". 321 */ 322 pr_offset = (size_t)arg1; 323 len = arg2; 324 KASSERT(len <= sizeof(tmpname), 325 ("length %d too long for %s", len, __func__)); 326 327 pr = req->td->td_ucred->cr_prison; 328 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 329 return (EPERM); 330 /* 331 * Make a local copy of hostname to get/set so we don't have to hold 332 * the jail mutex during the sysctl copyin/copyout activities. 333 */ 334 mtx_lock(&pr->pr_mtx); 335 bcopy((char *)pr + pr_offset, tmpname, len); 336 mtx_unlock(&pr->pr_mtx); 337 338 error = sysctl_handle_string(oidp, tmpname, len, req); 339 340 if (req->newptr != NULL && error == 0) { 341 /* 342 * Copy the locally set hostname to all jails that share 343 * this host info. 344 */ 345 sx_slock(&allprison_lock); 346 while (!(pr->pr_flags & PR_HOST)) 347 pr = pr->pr_parent; 348 mtx_lock(&pr->pr_mtx); 349 bcopy(tmpname, (char *)pr + pr_offset, len); 350 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 351 if (cpr->pr_flags & PR_HOST) 352 descend = 0; 353 else 354 bcopy(tmpname, (char *)cpr + pr_offset, len); 355 mtx_unlock(&pr->pr_mtx); 356 sx_sunlock(&allprison_lock); 357 } 358 return (error); 359 } 360 361 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 362 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 363 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN, 364 sysctl_hostname, "A", "Hostname"); 365 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, 366 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 367 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN, 368 sysctl_hostname, "A", "Name of the current YP/NIS domain"); 369 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid, 370 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 371 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN, 372 sysctl_hostname, "A", "Host UUID"); 373 374 static int regression_securelevel_nonmonotonic = 0; 375 376 #ifdef REGRESSION 377 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 378 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 379 #endif 380 381 static int 382 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 383 { 384 struct prison *pr, *cpr; 385 int descend, error, level; 386 387 pr = req->td->td_ucred->cr_prison; 388 389 /* 390 * Reading the securelevel is easy, since the current jail's level 391 * is known to be at least as secure as any higher levels. Perform 392 * a lockless read since the securelevel is an integer. 393 */ 394 level = pr->pr_securelevel; 395 error = sysctl_handle_int(oidp, &level, 0, req); 396 if (error || !req->newptr) 397 return (error); 398 /* Permit update only if the new securelevel exceeds the old. */ 399 sx_slock(&allprison_lock); 400 mtx_lock(&pr->pr_mtx); 401 if (!regression_securelevel_nonmonotonic && 402 level < pr->pr_securelevel) { 403 mtx_unlock(&pr->pr_mtx); 404 sx_sunlock(&allprison_lock); 405 return (EPERM); 406 } 407 pr->pr_securelevel = level; 408 /* 409 * Set all child jails to be at least this level, but do not lower 410 * them (even if regression_securelevel_nonmonotonic). 411 */ 412 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 413 if (cpr->pr_securelevel < level) 414 cpr->pr_securelevel = level; 415 } 416 mtx_unlock(&pr->pr_mtx); 417 sx_sunlock(&allprison_lock); 418 return (error); 419 } 420 421 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 422 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 0, 0, 423 sysctl_kern_securelvl, "I", 424 "Current secure level"); 425 426 #ifdef INCLUDE_CONFIG_FILE 427 /* Actual kernel configuration options. */ 428 extern char kernconfstring[]; 429 430 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE, 431 kernconfstring, 0, "Kernel configuration file"); 432 #endif 433 434 static int 435 sysctl_hostid(SYSCTL_HANDLER_ARGS) 436 { 437 struct prison *pr, *cpr; 438 u_long tmpid; 439 int descend, error; 440 441 /* 442 * Like sysctl_hostname, except it operates on a u_long 443 * instead of a string, and is used only for hostid. 444 */ 445 pr = req->td->td_ucred->cr_prison; 446 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 447 return (EPERM); 448 tmpid = pr->pr_hostid; 449 error = sysctl_handle_long(oidp, &tmpid, 0, req); 450 451 if (req->newptr != NULL && error == 0) { 452 sx_slock(&allprison_lock); 453 while (!(pr->pr_flags & PR_HOST)) 454 pr = pr->pr_parent; 455 mtx_lock(&pr->pr_mtx); 456 pr->pr_hostid = tmpid; 457 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 458 if (cpr->pr_flags & PR_HOST) 459 descend = 0; 460 else 461 cpr->pr_hostid = tmpid; 462 mtx_unlock(&pr->pr_mtx); 463 sx_sunlock(&allprison_lock); 464 } 465 return (error); 466 } 467 468 SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 469 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 470 NULL, 0, sysctl_hostid, "LU", "Host ID"); 471 472 static struct mtx bootid_lk; 473 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF); 474 475 static int 476 sysctl_bootid(SYSCTL_HANDLER_ARGS) 477 { 478 static uint8_t boot_id[16]; 479 static bool initialized = false; 480 481 mtx_lock(&bootid_lk); 482 if (!initialized) { 483 if (!is_random_seeded()) { 484 mtx_unlock(&bootid_lk); 485 return (ENXIO); 486 } 487 arc4random_buf(boot_id, sizeof(boot_id)); 488 initialized = true; 489 } 490 mtx_unlock(&bootid_lk); 491 492 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id))); 493 } 494 SYSCTL_PROC(_kern, OID_AUTO, boot_id, 495 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 496 NULL, 0, sysctl_bootid, "", "Random boot ID"); 497 498 /* 499 * The osrelease string is copied from the global (osrelease in vers.c) into 500 * prison0 by a sysinit and is inherited by child jails if not changed at jail 501 * creation, so we always return the copy from the current prison data. 502 */ 503 static int 504 sysctl_osrelease(SYSCTL_HANDLER_ARGS) 505 { 506 struct prison *pr; 507 508 pr = req->td->td_ucred->cr_prison; 509 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 510 511 } 512 513 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 514 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 515 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 516 517 /* 518 * The osreldate number is copied from the global (osreldate in vers.c) into 519 * prison0 by a sysinit and is inherited by child jails if not changed at jail 520 * creation, so we always return the value from the current prison data. 521 */ 522 static int 523 sysctl_osreldate(SYSCTL_HANDLER_ARGS) 524 { 525 struct prison *pr; 526 527 pr = req->td->td_ucred->cr_prison; 528 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 529 530 } 531 532 /* 533 * NOTICE: The *userland* release date is available in 534 * /usr/include/osreldate.h 535 */ 536 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 537 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 538 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 539 540 /* 541 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 542 * script defines two variables to expose the beginning and end. LLVM 543 * currently uses a SHA-1 hash, but other formats can be supported by checking 544 * the length of the section. 545 */ 546 547 extern char __build_id_start[]; 548 extern char __build_id_end[]; 549 550 #define BUILD_ID_HEADER_LEN 0x10 551 #define BUILD_ID_HASH_MAXLEN 0x14 552 553 static int 554 sysctl_build_id(SYSCTL_HANDLER_ARGS) 555 { 556 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 557 int hashlen; 558 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 559 560 /* 561 * The ELF note section has a four byte length for the vendor name, 562 * four byte length for the value, and a four byte vendor specific 563 * type. The name for the build id is "GNU\0". We skip the first 16 564 * bytes to read the build hash. We will return the remaining bytes up 565 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 566 * of bytes we will pad the value with zeros, as the section should be 567 * four byte aligned. 568 */ 569 if (sectionlen <= BUILD_ID_HEADER_LEN || 570 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 571 return (ENOENT); 572 } 573 574 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 575 for (int i = 0; i < hashlen; i++) { 576 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 577 snprintf(&buf[2*i], 3, "%02x", c); 578 } 579 580 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 581 } 582 583 SYSCTL_PROC(_kern, OID_AUTO, build_id, 584 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 585 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 586 587 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 588 "Kernel Features"); 589 590 #ifdef COMPAT_FREEBSD4 591 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 592 #endif 593 594 #ifdef COMPAT_FREEBSD5 595 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 596 #endif 597 598 #ifdef COMPAT_FREEBSD6 599 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 600 #endif 601 602 #ifdef COMPAT_FREEBSD7 603 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 604 #endif 605 606 /* 607 * This is really cheating. These actually live in the libc, something 608 * which I'm not quite sure is a good idea anyway, but in order for 609 * getnext and friends to actually work, we define dummies here. 610 * 611 * XXXRW: These probably should be CTLFLAG_CAPRD. 612 */ 613 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 614 "", 0, "PATH that finds all the standard utilities"); 615 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 616 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 617 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 618 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 619 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 620 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 621 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 622 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 623 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 624 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 625 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 626 SYSCTL_NULL_INT_PTR, 0, ""); 627 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 628 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 629 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 630 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 631 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 632 SYSCTL_NULL_INT_PTR, 0, 633 "The version of POSIX 1003.2 with which the system attempts to comply"); 634 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 635 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 636 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 637 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 638 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 639 SYSCTL_NULL_INT_PTR, 0, ""); 640 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 641 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 642 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 643 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 644 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 645 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 646 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 647 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 648 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 649 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 650 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 651 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 652 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 653 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 654 655 #include <sys/vnode.h> 656 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 657 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 658 659 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 660 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 661 662 static int 663 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 664 { 665 int error, pm; 666 667 pm = pid_max; 668 error = sysctl_handle_int(oidp, &pm, 0, req); 669 if (error || !req->newptr) 670 return (error); 671 sx_xlock(&proctree_lock); 672 sx_xlock(&allproc_lock); 673 674 /* 675 * Only permit the values less then PID_MAX. 676 * As a safety measure, do not allow to limit the pid_max too much. 677 */ 678 if (pm < 300 || pm > PID_MAX) 679 error = EINVAL; 680 else 681 pid_max = pm; 682 sx_xunlock(&allproc_lock); 683 sx_xunlock(&proctree_lock); 684 return (error); 685 } 686 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 687 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 688 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 689 690 #include <sys/bio.h> 691 #include <sys/buf.h> 692 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 693 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 694 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 695 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 696 697 #include <sys/user.h> 698 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 699 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 700 701 /* Used by kernel debuggers. */ 702 const int pcb_size = sizeof(struct pcb); 703 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 704 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 705 706 /* XXX compatibility, remove for 6.0 */ 707 #include <sys/imgact.h> 708 #include <sys/imgact_elf.h> 709 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 710 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 711 "compatibility for kern.fallback_elf_brand"); 712