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 #ifdef SCTL_MASK32 235 int i; 236 uint32_t pagesizes32[MAXPAGESIZES]; 237 238 if (req->flags & SCTL_MASK32) { 239 /* 240 * Recreate the "pagesizes" array with 32-bit elements. Truncate 241 * any page size greater than UINT32_MAX to zero. 242 */ 243 for (i = 0; i < MAXPAGESIZES; i++) 244 pagesizes32[i] = (uint32_t)pagesizes[i]; 245 246 error = SYSCTL_OUT(req, pagesizes32, sizeof(pagesizes32)); 247 } else 248 #endif 249 error = SYSCTL_OUT(req, pagesizes, sizeof(pagesizes)); 250 return (error); 251 } 252 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, 253 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 254 sysctl_hw_pagesizes, "LU", 255 "Supported page sizes"); 256 257 int adaptive_machine_arch = 1; 258 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 259 &adaptive_machine_arch, 1, 260 "Adapt reported machine architecture to the ABI of the binary"); 261 262 static const char * 263 proc_machine_arch(struct proc *p) 264 { 265 266 if (p->p_sysent->sv_machine_arch != NULL) 267 return (p->p_sysent->sv_machine_arch(p)); 268 #ifdef COMPAT_FREEBSD32 269 if (SV_PROC_FLAG(p, SV_ILP32)) 270 return (MACHINE_ARCH32); 271 #endif 272 return (MACHINE_ARCH); 273 } 274 275 static int 276 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 277 { 278 const char *machine_arch; 279 280 if (adaptive_machine_arch) 281 machine_arch = proc_machine_arch(curproc); 282 else 283 machine_arch = MACHINE_ARCH; 284 return (SYSCTL_OUT(req, machine_arch, strlen(machine_arch) + 1)); 285 } 286 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 287 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 288 "System architecture"); 289 290 #ifndef MACHINE_ARCHES 291 #ifdef COMPAT_FREEBSD32 292 #define MACHINE_ARCHES MACHINE_ARCH " " MACHINE_ARCH32 293 #else 294 #define MACHINE_ARCHES MACHINE_ARCH 295 #endif 296 #endif 297 298 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE, 299 MACHINE_ARCHES, 0, "Supported architectures for binaries"); 300 301 static int 302 sysctl_hostname(SYSCTL_HANDLER_ARGS) 303 { 304 struct prison *pr, *cpr; 305 size_t pr_offset; 306 char tmpname[MAXHOSTNAMELEN]; 307 int descend, error, len; 308 309 /* 310 * This function can set: hostname domainname hostuuid. 311 * Keep that in mind when comments say "hostname". 312 */ 313 pr_offset = (size_t)arg1; 314 len = arg2; 315 KASSERT(len <= sizeof(tmpname), 316 ("length %d too long for %s", len, __func__)); 317 318 pr = req->td->td_ucred->cr_prison; 319 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 320 return (EPERM); 321 /* 322 * Make a local copy of hostname to get/set so we don't have to hold 323 * the jail mutex during the sysctl copyin/copyout activities. 324 */ 325 mtx_lock(&pr->pr_mtx); 326 bcopy((char *)pr + pr_offset, tmpname, len); 327 mtx_unlock(&pr->pr_mtx); 328 329 error = sysctl_handle_string(oidp, tmpname, len, req); 330 331 if (req->newptr != NULL && error == 0) { 332 /* 333 * Copy the locally set hostname to all jails that share 334 * this host info. 335 */ 336 sx_slock(&allprison_lock); 337 while (!(pr->pr_flags & PR_HOST)) 338 pr = pr->pr_parent; 339 mtx_lock(&pr->pr_mtx); 340 bcopy(tmpname, (char *)pr + pr_offset, len); 341 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 342 if (cpr->pr_flags & PR_HOST) 343 descend = 0; 344 else 345 bcopy(tmpname, (char *)cpr + pr_offset, len); 346 mtx_unlock(&pr->pr_mtx); 347 sx_sunlock(&allprison_lock); 348 } 349 return (error); 350 } 351 352 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 353 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 354 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN, 355 sysctl_hostname, "A", "Hostname"); 356 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, 357 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 358 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN, 359 sysctl_hostname, "A", "Name of the current YP/NIS domain"); 360 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid, 361 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 362 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN, 363 sysctl_hostname, "A", "Host UUID"); 364 365 static int regression_securelevel_nonmonotonic = 0; 366 367 #ifdef REGRESSION 368 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 369 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 370 #endif 371 372 static int 373 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 374 { 375 struct prison *pr, *cpr; 376 int descend, error, level; 377 378 pr = req->td->td_ucred->cr_prison; 379 380 /* 381 * Reading the securelevel is easy, since the current jail's level 382 * is known to be at least as secure as any higher levels. Perform 383 * a lockless read since the securelevel is an integer. 384 */ 385 level = pr->pr_securelevel; 386 error = sysctl_handle_int(oidp, &level, 0, req); 387 if (error || !req->newptr) 388 return (error); 389 /* Permit update only if the new securelevel exceeds the old. */ 390 sx_slock(&allprison_lock); 391 mtx_lock(&pr->pr_mtx); 392 if (!regression_securelevel_nonmonotonic && 393 level < pr->pr_securelevel) { 394 mtx_unlock(&pr->pr_mtx); 395 sx_sunlock(&allprison_lock); 396 return (EPERM); 397 } 398 pr->pr_securelevel = level; 399 /* 400 * Set all child jails to be at least this level, but do not lower 401 * them (even if regression_securelevel_nonmonotonic). 402 */ 403 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 404 if (cpr->pr_securelevel < level) 405 cpr->pr_securelevel = level; 406 } 407 mtx_unlock(&pr->pr_mtx); 408 sx_sunlock(&allprison_lock); 409 return (error); 410 } 411 412 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 413 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 0, 0, 414 sysctl_kern_securelvl, "I", 415 "Current secure level"); 416 417 #ifdef INCLUDE_CONFIG_FILE 418 /* Actual kernel configuration options. */ 419 extern char kernconfstring[]; 420 421 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE, 422 kernconfstring, 0, "Kernel configuration file"); 423 #endif 424 425 static int 426 sysctl_hostid(SYSCTL_HANDLER_ARGS) 427 { 428 struct prison *pr, *cpr; 429 u_long tmpid; 430 int descend, error; 431 432 /* 433 * Like sysctl_hostname, except it operates on a u_long 434 * instead of a string, and is used only for hostid. 435 */ 436 pr = req->td->td_ucred->cr_prison; 437 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 438 return (EPERM); 439 tmpid = pr->pr_hostid; 440 error = sysctl_handle_long(oidp, &tmpid, 0, req); 441 442 if (req->newptr != NULL && error == 0) { 443 sx_slock(&allprison_lock); 444 while (!(pr->pr_flags & PR_HOST)) 445 pr = pr->pr_parent; 446 mtx_lock(&pr->pr_mtx); 447 pr->pr_hostid = tmpid; 448 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 449 if (cpr->pr_flags & PR_HOST) 450 descend = 0; 451 else 452 cpr->pr_hostid = tmpid; 453 mtx_unlock(&pr->pr_mtx); 454 sx_sunlock(&allprison_lock); 455 } 456 return (error); 457 } 458 459 SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 460 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 461 NULL, 0, sysctl_hostid, "LU", "Host ID"); 462 463 static struct mtx bootid_lk; 464 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF); 465 466 static int 467 sysctl_bootid(SYSCTL_HANDLER_ARGS) 468 { 469 static uint8_t boot_id[16]; 470 static bool initialized = false; 471 472 mtx_lock(&bootid_lk); 473 if (!initialized) { 474 if (!is_random_seeded()) { 475 mtx_unlock(&bootid_lk); 476 return (ENXIO); 477 } 478 arc4random_buf(boot_id, sizeof(boot_id)); 479 initialized = true; 480 } 481 mtx_unlock(&bootid_lk); 482 483 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id))); 484 } 485 SYSCTL_PROC(_kern, OID_AUTO, boot_id, 486 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 487 NULL, 0, sysctl_bootid, "", "Random boot ID"); 488 489 /* 490 * The osrelease string is copied from the global (osrelease in vers.c) into 491 * prison0 by a sysinit and is inherited by child jails if not changed at jail 492 * creation, so we always return the copy from the current prison data. 493 */ 494 static int 495 sysctl_osrelease(SYSCTL_HANDLER_ARGS) 496 { 497 struct prison *pr; 498 499 pr = req->td->td_ucred->cr_prison; 500 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 501 502 } 503 504 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 505 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 506 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 507 508 /* 509 * The osreldate number is copied from the global (osreldate in vers.c) into 510 * prison0 by a sysinit and is inherited by child jails if not changed at jail 511 * creation, so we always return the value from the current prison data. 512 */ 513 static int 514 sysctl_osreldate(SYSCTL_HANDLER_ARGS) 515 { 516 struct prison *pr; 517 518 pr = req->td->td_ucred->cr_prison; 519 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 520 521 } 522 523 /* 524 * NOTICE: The *userland* release date is available in 525 * /usr/include/osreldate.h 526 */ 527 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 528 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 529 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 530 531 /* 532 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 533 * script defines two variables to expose the beginning and end. LLVM 534 * currently uses a SHA-1 hash, but other formats can be supported by checking 535 * the length of the section. 536 */ 537 538 extern char __build_id_start[]; 539 extern char __build_id_end[]; 540 541 #define BUILD_ID_HEADER_LEN 0x10 542 #define BUILD_ID_HASH_MAXLEN 0x14 543 544 static int 545 sysctl_build_id(SYSCTL_HANDLER_ARGS) 546 { 547 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 548 int hashlen; 549 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 550 551 /* 552 * The ELF note section has a four byte length for the vendor name, 553 * four byte length for the value, and a four byte vendor specific 554 * type. The name for the build id is "GNU\0". We skip the first 16 555 * bytes to read the build hash. We will return the remaining bytes up 556 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 557 * of bytes we will pad the value with zeros, as the section should be 558 * four byte aligned. 559 */ 560 if (sectionlen <= BUILD_ID_HEADER_LEN || 561 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 562 return (ENOENT); 563 } 564 565 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 566 for (int i = 0; i < hashlen; i++) { 567 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 568 snprintf(&buf[2*i], 3, "%02x", c); 569 } 570 571 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 572 } 573 574 SYSCTL_PROC(_kern, OID_AUTO, build_id, 575 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 576 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 577 578 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 579 "Kernel Features"); 580 581 #ifdef COMPAT_FREEBSD4 582 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 583 #endif 584 585 #ifdef COMPAT_FREEBSD5 586 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 587 #endif 588 589 #ifdef COMPAT_FREEBSD6 590 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 591 #endif 592 593 #ifdef COMPAT_FREEBSD7 594 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 595 #endif 596 597 /* 598 * This is really cheating. These actually live in the libc, something 599 * which I'm not quite sure is a good idea anyway, but in order for 600 * getnext and friends to actually work, we define dummies here. 601 * 602 * XXXRW: These probably should be CTLFLAG_CAPRD. 603 */ 604 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 605 "", 0, "PATH that finds all the standard utilities"); 606 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 607 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 608 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 609 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 610 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 611 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 612 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 613 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 614 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 615 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 616 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 617 SYSCTL_NULL_INT_PTR, 0, ""); 618 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 619 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 620 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 621 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 622 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 623 SYSCTL_NULL_INT_PTR, 0, 624 "The version of POSIX 1003.2 with which the system attempts to comply"); 625 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 626 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 627 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 628 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 629 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 630 SYSCTL_NULL_INT_PTR, 0, ""); 631 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 632 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 633 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 634 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 635 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 636 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 637 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 638 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 639 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 640 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 641 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 642 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 643 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 644 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 645 646 #include <sys/vnode.h> 647 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 648 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 649 650 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 651 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 652 653 static int 654 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 655 { 656 int error, pm; 657 658 pm = pid_max; 659 error = sysctl_handle_int(oidp, &pm, 0, req); 660 if (error || !req->newptr) 661 return (error); 662 sx_xlock(&proctree_lock); 663 sx_xlock(&allproc_lock); 664 665 /* 666 * Only permit the values less then PID_MAX. 667 * As a safety measure, do not allow to limit the pid_max too much. 668 */ 669 if (pm < 300 || pm > PID_MAX) 670 error = EINVAL; 671 else 672 pid_max = pm; 673 sx_xunlock(&allproc_lock); 674 sx_xunlock(&proctree_lock); 675 return (error); 676 } 677 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 678 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 679 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 680 681 #include <sys/bio.h> 682 #include <sys/buf.h> 683 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 684 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 685 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 686 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 687 688 #include <sys/user.h> 689 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 690 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 691 692 /* Used by kernel debuggers. */ 693 const int pcb_size = sizeof(struct pcb); 694 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 695 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 696 697 /* XXX compatibility, remove for 6.0 */ 698 #include <sys/imgact.h> 699 #include <sys/imgact_elf.h> 700 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 701 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 702 "compatibility for kern.fallback_elf_brand"); 703