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/jail.h> 49 #include <sys/kernel.h> 50 #include <sys/limits.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/proc.h> 54 #include <sys/random.h> 55 #include <sys/sbuf.h> 56 #include <sys/smp.h> 57 #include <sys/sx.h> 58 #include <sys/vmmeter.h> 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 #include <sys/unistd.h> 62 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, 68 "Virtual memory"); 69 SYSCTL_ROOT_NODE(CTL_VFS, vfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 70 "File system"); 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, 74 "Debugging"); 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, 78 "hardware"); 79 SYSCTL_ROOT_NODE(CTL_MACHDEP, machdep, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 80 "machine dependent"); 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, 84 "user-level"); 85 SYSCTL_ROOT_NODE(CTL_P1003_1B, p1003_1b, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 86 "p1003_1b, (see p1003_1b.h)"); 87 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, 91 "Security"); 92 #ifdef REGRESSION 93 SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 94 "Regression test MIB"); 95 #endif 96 97 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE, 98 kern_ident, 0, "Kernel identifier"); 99 100 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD|CTLFLAG_CAPRD, 101 SYSCTL_NULL_INT_PTR, BSD, "Operating system revision"); 102 103 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE, 104 version, 0, "Kernel version"); 105 106 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD|CTLFLAG_MPSAFE, 107 compiler_version, 0, "Version of compiler used to compile kernel"); 108 109 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE| 110 CTLFLAG_CAPRD, ostype, 0, "Operating system type"); 111 112 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, 113 &maxproc, 0, "Maximum number of processes"); 114 115 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 116 &maxprocperuid, 0, "Maximum processes allowed per userid"); 117 118 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, 119 &maxusers, 0, "Hint for kernel tuning"); 120 121 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD|CTLFLAG_CAPRD, 122 SYSCTL_NULL_INT_PTR, ARG_MAX, "Maximum bytes of argument to execve(2)"); 123 124 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD|CTLFLAG_CAPRD, 125 SYSCTL_NULL_INT_PTR, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 126 127 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"); 130 131 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD|CTLFLAG_CAPRD, 132 SYSCTL_NULL_INT_PTR, 1, "Whether job control is available"); 133 134 #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"); 137 #else 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"); 140 #endif 141 142 char kernelname[MAXPATHLEN] = PATH_KERNEL; /* XXX bloat */ 143 144 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW | CTLFLAG_MPSAFE, 145 kernelname, sizeof kernelname, "Name of kernel file booted"); 146 147 SYSCTL_INT(_kern, KERN_MAXPHYS, maxphys, CTLFLAG_RD | CTLFLAG_CAPRD, 148 SYSCTL_NULL_INT_PTR, MAXPHYS, "Maximum block I/O access size"); 149 150 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD, 151 &mp_ncpus, 0, "Number of active CPUs"); 152 153 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD, 154 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order"); 155 156 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD, 157 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size"); 158 159 static int 160 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 161 { 162 char buf[256]; 163 size_t len; 164 165 len = MIN(req->oldlen, sizeof(buf)); 166 read_random(buf, len); 167 return (SYSCTL_OUT(req, buf, len)); 168 } 169 170 SYSCTL_PROC(_kern, KERN_ARND, arandom, 171 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0, 172 sysctl_kern_arnd, "", "arc4rand"); 173 174 static int 175 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 176 { 177 u_long val, p; 178 179 p = SIZE_T_MAX >> PAGE_SHIFT; 180 if (physmem < p) 181 p = physmem; 182 val = ctob(p); 183 return (sysctl_handle_long(oidp, &val, 0, req)); 184 } 185 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, 186 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 187 sysctl_hw_physmem, "LU", 188 "Amount of physical memory (in bytes)"); 189 190 static int 191 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 192 { 193 u_long val, p; 194 195 p = SIZE_T_MAX >> PAGE_SHIFT; 196 if (realmem < p) 197 p = realmem; 198 val = ctob(p); 199 return (sysctl_handle_long(oidp, &val, 0, req)); 200 } 201 SYSCTL_PROC(_hw, HW_REALMEM, realmem, 202 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 203 sysctl_hw_realmem, "LU", 204 "Amount of memory (in bytes) reported by the firmware"); 205 206 static int 207 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 208 { 209 u_long val, p, p1; 210 211 p1 = physmem - vm_wire_count(); 212 p = SIZE_T_MAX >> PAGE_SHIFT; 213 if (p1 < p) 214 p = p1; 215 val = ctob(p); 216 return (sysctl_handle_long(oidp, &val, 0, req)); 217 } 218 SYSCTL_PROC(_hw, HW_USERMEM, usermem, 219 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 220 sysctl_hw_usermem, "LU", 221 "Amount of memory (in bytes) which is not wired"); 222 223 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, 224 "Amount of physical memory (in pages)"); 225 226 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE }; 227 228 static int 229 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS) 230 { 231 int error; 232 #ifdef SCTL_MASK32 233 int i; 234 uint32_t pagesizes32[MAXPAGESIZES]; 235 236 if (req->flags & SCTL_MASK32) { 237 /* 238 * Recreate the "pagesizes" array with 32-bit elements. Truncate 239 * any page size greater than UINT32_MAX to zero. 240 */ 241 for (i = 0; i < MAXPAGESIZES; i++) 242 pagesizes32[i] = (uint32_t)pagesizes[i]; 243 244 error = SYSCTL_OUT(req, pagesizes32, sizeof(pagesizes32)); 245 } else 246 #endif 247 error = SYSCTL_OUT(req, pagesizes, sizeof(pagesizes)); 248 return (error); 249 } 250 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, 251 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 252 sysctl_hw_pagesizes, "LU", 253 "Supported page sizes"); 254 255 #ifdef SCTL_MASK32 256 int adaptive_machine_arch = 1; 257 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 258 &adaptive_machine_arch, 1, 259 "Adapt reported machine architecture to the ABI of the binary"); 260 #endif 261 262 static int 263 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 264 { 265 int error; 266 static const char machine_arch[] = MACHINE_ARCH; 267 #ifdef SCTL_MASK32 268 static const char machine_arch32[] = MACHINE_ARCH32; 269 270 if ((req->flags & SCTL_MASK32) != 0 && adaptive_machine_arch) 271 error = SYSCTL_OUT(req, machine_arch32, sizeof(machine_arch32)); 272 else 273 #endif 274 error = SYSCTL_OUT(req, machine_arch, sizeof(machine_arch)); 275 return (error); 276 277 } 278 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 279 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 280 "System architecture"); 281 282 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE, 283 #ifdef COMPAT_FREEBSD32 284 MACHINE_ARCH " " MACHINE_ARCH32, 0, "Supported architectures for binaries"); 285 #else 286 MACHINE_ARCH, 0, "Supported architectures for binaries"); 287 #endif 288 289 static int 290 sysctl_hostname(SYSCTL_HANDLER_ARGS) 291 { 292 struct prison *pr, *cpr; 293 size_t pr_offset; 294 char tmpname[MAXHOSTNAMELEN]; 295 int descend, error, len; 296 297 /* 298 * This function can set: hostname domainname hostuuid. 299 * Keep that in mind when comments say "hostname". 300 */ 301 pr_offset = (size_t)arg1; 302 len = arg2; 303 KASSERT(len <= sizeof(tmpname), 304 ("length %d too long for %s", len, __func__)); 305 306 pr = req->td->td_ucred->cr_prison; 307 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 308 return (EPERM); 309 /* 310 * Make a local copy of hostname to get/set so we don't have to hold 311 * the jail mutex during the sysctl copyin/copyout activities. 312 */ 313 mtx_lock(&pr->pr_mtx); 314 bcopy((char *)pr + pr_offset, tmpname, len); 315 mtx_unlock(&pr->pr_mtx); 316 317 error = sysctl_handle_string(oidp, tmpname, len, req); 318 319 if (req->newptr != NULL && error == 0) { 320 /* 321 * Copy the locally set hostname to all jails that share 322 * this host info. 323 */ 324 sx_slock(&allprison_lock); 325 while (!(pr->pr_flags & PR_HOST)) 326 pr = pr->pr_parent; 327 mtx_lock(&pr->pr_mtx); 328 bcopy(tmpname, (char *)pr + pr_offset, len); 329 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 330 if (cpr->pr_flags & PR_HOST) 331 descend = 0; 332 else 333 bcopy(tmpname, (char *)cpr + pr_offset, len); 334 mtx_unlock(&pr->pr_mtx); 335 sx_sunlock(&allprison_lock); 336 } 337 return (error); 338 } 339 340 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 341 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 342 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN, 343 sysctl_hostname, "A", "Hostname"); 344 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, 345 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 346 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN, 347 sysctl_hostname, "A", "Name of the current YP/NIS domain"); 348 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid, 349 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 350 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN, 351 sysctl_hostname, "A", "Host UUID"); 352 353 static int regression_securelevel_nonmonotonic = 0; 354 355 #ifdef REGRESSION 356 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 357 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 358 #endif 359 360 static int 361 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 362 { 363 struct prison *pr, *cpr; 364 int descend, error, level; 365 366 pr = req->td->td_ucred->cr_prison; 367 368 /* 369 * Reading the securelevel is easy, since the current jail's level 370 * is known to be at least as secure as any higher levels. Perform 371 * a lockless read since the securelevel is an integer. 372 */ 373 level = pr->pr_securelevel; 374 error = sysctl_handle_int(oidp, &level, 0, req); 375 if (error || !req->newptr) 376 return (error); 377 /* Permit update only if the new securelevel exceeds the old. */ 378 sx_slock(&allprison_lock); 379 mtx_lock(&pr->pr_mtx); 380 if (!regression_securelevel_nonmonotonic && 381 level < pr->pr_securelevel) { 382 mtx_unlock(&pr->pr_mtx); 383 sx_sunlock(&allprison_lock); 384 return (EPERM); 385 } 386 pr->pr_securelevel = level; 387 /* 388 * Set all child jails to be at least this level, but do not lower 389 * them (even if regression_securelevel_nonmonotonic). 390 */ 391 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 392 if (cpr->pr_securelevel < level) 393 cpr->pr_securelevel = level; 394 } 395 mtx_unlock(&pr->pr_mtx); 396 sx_sunlock(&allprison_lock); 397 return (error); 398 } 399 400 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 401 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 0, 0, 402 sysctl_kern_securelvl, "I", 403 "Current secure level"); 404 405 #ifdef INCLUDE_CONFIG_FILE 406 /* Actual kernel configuration options. */ 407 extern char kernconfstring[]; 408 409 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE, 410 kernconfstring, 0, "Kernel configuration file"); 411 #endif 412 413 static int 414 sysctl_hostid(SYSCTL_HANDLER_ARGS) 415 { 416 struct prison *pr, *cpr; 417 u_long tmpid; 418 int descend, error; 419 420 /* 421 * Like sysctl_hostname, except it operates on a u_long 422 * instead of a string, and is used only for hostid. 423 */ 424 pr = req->td->td_ucred->cr_prison; 425 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 426 return (EPERM); 427 tmpid = pr->pr_hostid; 428 error = sysctl_handle_long(oidp, &tmpid, 0, req); 429 430 if (req->newptr != NULL && error == 0) { 431 sx_slock(&allprison_lock); 432 while (!(pr->pr_flags & PR_HOST)) 433 pr = pr->pr_parent; 434 mtx_lock(&pr->pr_mtx); 435 pr->pr_hostid = tmpid; 436 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 437 if (cpr->pr_flags & PR_HOST) 438 descend = 0; 439 else 440 cpr->pr_hostid = tmpid; 441 mtx_unlock(&pr->pr_mtx); 442 sx_sunlock(&allprison_lock); 443 } 444 return (error); 445 } 446 447 SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 448 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 449 NULL, 0, sysctl_hostid, "LU", "Host ID"); 450 451 static struct mtx bootid_lk; 452 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF); 453 454 static int 455 sysctl_bootid(SYSCTL_HANDLER_ARGS) 456 { 457 static uint8_t boot_id[16]; 458 static bool initialized = false; 459 460 mtx_lock(&bootid_lk); 461 if (!initialized) { 462 if (!is_random_seeded()) { 463 mtx_unlock(&bootid_lk); 464 return (ENXIO); 465 } 466 arc4random_buf(boot_id, sizeof(boot_id)); 467 initialized = true; 468 } 469 mtx_unlock(&bootid_lk); 470 471 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id))); 472 } 473 SYSCTL_PROC(_kern, OID_AUTO, boot_id, 474 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 475 NULL, 0, sysctl_bootid, "", "Random boot ID"); 476 477 /* 478 * The osrelease string is copied from the global (osrelease in vers.c) into 479 * prison0 by a sysinit and is inherited by child jails if not changed at jail 480 * creation, so we always return the copy from the current prison data. 481 */ 482 static int 483 sysctl_osrelease(SYSCTL_HANDLER_ARGS) 484 { 485 struct prison *pr; 486 487 pr = req->td->td_ucred->cr_prison; 488 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 489 490 } 491 492 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 493 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 494 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 495 496 /* 497 * The osreldate number is copied from the global (osreldate in vers.c) into 498 * prison0 by a sysinit and is inherited by child jails if not changed at jail 499 * creation, so we always return the value from the current prison data. 500 */ 501 static int 502 sysctl_osreldate(SYSCTL_HANDLER_ARGS) 503 { 504 struct prison *pr; 505 506 pr = req->td->td_ucred->cr_prison; 507 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 508 509 } 510 511 /* 512 * NOTICE: The *userland* release date is available in 513 * /usr/include/osreldate.h 514 */ 515 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 516 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 517 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 518 519 /* 520 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 521 * script defines two variables to expose the beginning and end. LLVM 522 * currently uses a SHA-1 hash, but other formats can be supported by checking 523 * the length of the section. 524 */ 525 526 extern char __build_id_start[]; 527 extern char __build_id_end[]; 528 529 #define BUILD_ID_HEADER_LEN 0x10 530 #define BUILD_ID_HASH_MAXLEN 0x14 531 532 static int 533 sysctl_build_id(SYSCTL_HANDLER_ARGS) 534 { 535 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 536 int hashlen; 537 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 538 539 /* 540 * The ELF note section has a four byte length for the vendor name, 541 * four byte length for the value, and a four byte vendor specific 542 * type. The name for the build id is "GNU\0". We skip the first 16 543 * bytes to read the build hash. We will return the remaining bytes up 544 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 545 * of bytes we will pad the value with zeros, as the section should be 546 * four byte aligned. 547 */ 548 if (sectionlen <= BUILD_ID_HEADER_LEN || 549 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 550 return (ENOENT); 551 } 552 553 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 554 for (int i = 0; i < hashlen; i++) { 555 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 556 snprintf(&buf[2*i], 3, "%02x", c); 557 } 558 559 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 560 } 561 562 SYSCTL_PROC(_kern, OID_AUTO, build_id, 563 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 564 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 565 566 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 567 "Kernel Features"); 568 569 #ifdef COMPAT_FREEBSD4 570 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 571 #endif 572 573 #ifdef COMPAT_FREEBSD5 574 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 575 #endif 576 577 #ifdef COMPAT_FREEBSD6 578 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 579 #endif 580 581 #ifdef COMPAT_FREEBSD7 582 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 583 #endif 584 585 /* 586 * This is really cheating. These actually live in the libc, something 587 * which I'm not quite sure is a good idea anyway, but in order for 588 * getnext and friends to actually work, we define dummies here. 589 * 590 * XXXRW: These probably should be CTLFLAG_CAPRD. 591 */ 592 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 593 "", 0, "PATH that finds all the standard utilities"); 594 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 595 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 596 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 597 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 598 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 599 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 600 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 601 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 602 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 603 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 604 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 605 SYSCTL_NULL_INT_PTR, 0, ""); 606 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 607 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 608 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 609 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 610 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 611 SYSCTL_NULL_INT_PTR, 0, 612 "The version of POSIX 1003.2 with which the system attempts to comply"); 613 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 614 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 615 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 616 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 617 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 618 SYSCTL_NULL_INT_PTR, 0, ""); 619 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 620 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 621 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 622 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 623 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 624 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 625 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 626 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 627 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 628 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 629 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 630 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 631 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 632 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 633 634 #include <sys/vnode.h> 635 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 636 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 637 638 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 639 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 640 641 static int 642 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 643 { 644 int error, pm; 645 646 pm = pid_max; 647 error = sysctl_handle_int(oidp, &pm, 0, req); 648 if (error || !req->newptr) 649 return (error); 650 sx_xlock(&proctree_lock); 651 sx_xlock(&allproc_lock); 652 653 /* 654 * Only permit the values less then PID_MAX. 655 * As a safety measure, do not allow to limit the pid_max too much. 656 */ 657 if (pm < 300 || pm > PID_MAX) 658 error = EINVAL; 659 else 660 pid_max = pm; 661 sx_xunlock(&allproc_lock); 662 sx_xunlock(&proctree_lock); 663 return (error); 664 } 665 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 666 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 667 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 668 669 #include <sys/bio.h> 670 #include <sys/buf.h> 671 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 672 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 673 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 674 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 675 676 #include <sys/user.h> 677 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 678 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 679 680 /* Used by kernel debuggers. */ 681 const int pcb_size = sizeof(struct pcb); 682 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 683 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 684 685 /* XXX compatibility, remove for 6.0 */ 686 #include <sys/imgact.h> 687 #include <sys/imgact_elf.h> 688 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 689 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 690 "compatibility for kern.fallback_elf_brand"); 691