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. 242 * Truncate any page size greater than UINT32_MAX to zero, 243 * which assumes that page sizes are powers of two. 244 */ 245 for (i = 0; i < MAXPAGESIZES; i++) 246 pagesizes32[i] = (uint32_t)pagesizes[i]; 247 248 len = sizeof(pagesizes32); 249 if (len > req->oldlen) 250 len = req->oldlen; 251 error = SYSCTL_OUT(req, pagesizes32, len); 252 } else 253 #endif 254 { 255 len = sizeof(pagesizes); 256 if (len > req->oldlen) 257 len = req->oldlen; 258 error = SYSCTL_OUT(req, pagesizes, len); 259 } 260 return (error); 261 } 262 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, 263 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 264 sysctl_hw_pagesizes, "LU", 265 "Supported page sizes"); 266 267 int adaptive_machine_arch = 1; 268 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 269 &adaptive_machine_arch, 1, 270 "Adapt reported machine architecture to the ABI of the binary"); 271 272 static const char * 273 proc_machine_arch(struct proc *p) 274 { 275 276 if (p->p_sysent->sv_machine_arch != NULL) 277 return (p->p_sysent->sv_machine_arch(p)); 278 #ifdef COMPAT_FREEBSD32 279 if (SV_PROC_FLAG(p, SV_ILP32)) 280 return (MACHINE_ARCH32); 281 #endif 282 return (MACHINE_ARCH); 283 } 284 285 static int 286 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 287 { 288 const char *machine_arch; 289 290 if (adaptive_machine_arch) 291 machine_arch = proc_machine_arch(curproc); 292 else 293 machine_arch = MACHINE_ARCH; 294 return (SYSCTL_OUT(req, machine_arch, strlen(machine_arch) + 1)); 295 } 296 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 297 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 298 "System architecture"); 299 300 #ifndef MACHINE_ARCHES 301 #ifdef COMPAT_FREEBSD32 302 #define MACHINE_ARCHES MACHINE_ARCH " " MACHINE_ARCH32 303 #else 304 #define MACHINE_ARCHES MACHINE_ARCH 305 #endif 306 #endif 307 308 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE, 309 MACHINE_ARCHES, 0, "Supported architectures for binaries"); 310 311 static int 312 sysctl_hostname(SYSCTL_HANDLER_ARGS) 313 { 314 struct prison *pr, *cpr; 315 size_t pr_offset; 316 char tmpname[MAXHOSTNAMELEN]; 317 int descend, error, len; 318 319 /* 320 * This function can set: hostname domainname hostuuid. 321 * Keep that in mind when comments say "hostname". 322 */ 323 pr_offset = (size_t)arg1; 324 len = arg2; 325 KASSERT(len <= sizeof(tmpname), 326 ("length %d too long for %s", len, __func__)); 327 328 pr = req->td->td_ucred->cr_prison; 329 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 330 return (EPERM); 331 /* 332 * Make a local copy of hostname to get/set so we don't have to hold 333 * the jail mutex during the sysctl copyin/copyout activities. 334 */ 335 mtx_lock(&pr->pr_mtx); 336 bcopy((char *)pr + pr_offset, tmpname, len); 337 mtx_unlock(&pr->pr_mtx); 338 339 error = sysctl_handle_string(oidp, tmpname, len, req); 340 341 if (req->newptr != NULL && error == 0) { 342 /* 343 * Copy the locally set hostname to all jails that share 344 * this host info. 345 */ 346 sx_slock(&allprison_lock); 347 while (!(pr->pr_flags & PR_HOST)) 348 pr = pr->pr_parent; 349 mtx_lock(&pr->pr_mtx); 350 bcopy(tmpname, (char *)pr + pr_offset, len); 351 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 352 if (cpr->pr_flags & PR_HOST) 353 descend = 0; 354 else 355 bcopy(tmpname, (char *)cpr + pr_offset, len); 356 mtx_unlock(&pr->pr_mtx); 357 sx_sunlock(&allprison_lock); 358 } 359 return (error); 360 } 361 362 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 363 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 364 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN, 365 sysctl_hostname, "A", "Hostname"); 366 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, 367 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 368 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN, 369 sysctl_hostname, "A", "Name of the current YP/NIS domain"); 370 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid, 371 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 372 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN, 373 sysctl_hostname, "A", "Host UUID"); 374 375 static int regression_securelevel_nonmonotonic = 0; 376 377 #ifdef REGRESSION 378 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 379 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 380 #endif 381 382 static int 383 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 384 { 385 struct prison *pr, *cpr; 386 int descend, error, level; 387 388 pr = req->td->td_ucred->cr_prison; 389 390 /* 391 * Reading the securelevel is easy, since the current jail's level 392 * is known to be at least as secure as any higher levels. Perform 393 * a lockless read since the securelevel is an integer. 394 */ 395 level = pr->pr_securelevel; 396 error = sysctl_handle_int(oidp, &level, 0, req); 397 if (error || !req->newptr) 398 return (error); 399 /* Permit update only if the new securelevel exceeds the old. */ 400 sx_slock(&allprison_lock); 401 mtx_lock(&pr->pr_mtx); 402 if (!regression_securelevel_nonmonotonic && 403 level < pr->pr_securelevel) { 404 mtx_unlock(&pr->pr_mtx); 405 sx_sunlock(&allprison_lock); 406 return (EPERM); 407 } 408 pr->pr_securelevel = level; 409 /* 410 * Set all child jails to be at least this level, but do not lower 411 * them (even if regression_securelevel_nonmonotonic). 412 */ 413 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 414 if (cpr->pr_securelevel < level) 415 cpr->pr_securelevel = level; 416 } 417 mtx_unlock(&pr->pr_mtx); 418 sx_sunlock(&allprison_lock); 419 return (error); 420 } 421 422 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 423 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 0, 0, 424 sysctl_kern_securelvl, "I", 425 "Current secure level"); 426 427 #ifdef INCLUDE_CONFIG_FILE 428 /* Actual kernel configuration options. */ 429 extern char kernconfstring[]; 430 431 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE, 432 kernconfstring, 0, "Kernel configuration file"); 433 #endif 434 435 static int 436 sysctl_hostid(SYSCTL_HANDLER_ARGS) 437 { 438 struct prison *pr, *cpr; 439 u_long tmpid; 440 int descend, error; 441 442 /* 443 * Like sysctl_hostname, except it operates on a u_long 444 * instead of a string, and is used only for hostid. 445 */ 446 pr = req->td->td_ucred->cr_prison; 447 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 448 return (EPERM); 449 tmpid = pr->pr_hostid; 450 error = sysctl_handle_long(oidp, &tmpid, 0, req); 451 452 if (req->newptr != NULL && error == 0) { 453 sx_slock(&allprison_lock); 454 while (!(pr->pr_flags & PR_HOST)) 455 pr = pr->pr_parent; 456 mtx_lock(&pr->pr_mtx); 457 pr->pr_hostid = tmpid; 458 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 459 if (cpr->pr_flags & PR_HOST) 460 descend = 0; 461 else 462 cpr->pr_hostid = tmpid; 463 mtx_unlock(&pr->pr_mtx); 464 sx_sunlock(&allprison_lock); 465 } 466 return (error); 467 } 468 469 SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 470 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 471 NULL, 0, sysctl_hostid, "LU", "Host ID"); 472 473 static struct mtx bootid_lk; 474 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF); 475 476 static int 477 sysctl_bootid(SYSCTL_HANDLER_ARGS) 478 { 479 static uint8_t boot_id[16]; 480 static bool initialized = false; 481 482 mtx_lock(&bootid_lk); 483 if (!initialized) { 484 if (!is_random_seeded()) { 485 mtx_unlock(&bootid_lk); 486 return (ENXIO); 487 } 488 arc4random_buf(boot_id, sizeof(boot_id)); 489 initialized = true; 490 } 491 mtx_unlock(&bootid_lk); 492 493 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id))); 494 } 495 SYSCTL_PROC(_kern, OID_AUTO, boot_id, 496 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 497 NULL, 0, sysctl_bootid, "", "Random boot ID"); 498 499 /* 500 * The osrelease string is copied from the global (osrelease in vers.c) into 501 * prison0 by a sysinit and is inherited by child jails if not changed at jail 502 * creation, so we always return the copy from the current prison data. 503 */ 504 static int 505 sysctl_osrelease(SYSCTL_HANDLER_ARGS) 506 { 507 struct prison *pr; 508 509 pr = req->td->td_ucred->cr_prison; 510 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 511 512 } 513 514 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 515 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 516 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 517 518 /* 519 * The osreldate number is copied from the global (osreldate in vers.c) into 520 * prison0 by a sysinit and is inherited by child jails if not changed at jail 521 * creation, so we always return the value from the current prison data. 522 */ 523 static int 524 sysctl_osreldate(SYSCTL_HANDLER_ARGS) 525 { 526 struct prison *pr; 527 528 pr = req->td->td_ucred->cr_prison; 529 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 530 531 } 532 533 /* 534 * NOTICE: The *userland* release date is available in 535 * /usr/include/osreldate.h 536 */ 537 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 538 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 539 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 540 541 /* 542 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 543 * script defines two variables to expose the beginning and end. LLVM 544 * currently uses a SHA-1 hash, but other formats can be supported by checking 545 * the length of the section. 546 */ 547 548 extern char __build_id_start[]; 549 extern char __build_id_end[]; 550 551 #define BUILD_ID_HEADER_LEN 0x10 552 #define BUILD_ID_HASH_MAXLEN 0x14 553 554 static int 555 sysctl_build_id(SYSCTL_HANDLER_ARGS) 556 { 557 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 558 int hashlen; 559 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 560 561 /* 562 * The ELF note section has a four byte length for the vendor name, 563 * four byte length for the value, and a four byte vendor specific 564 * type. The name for the build id is "GNU\0". We skip the first 16 565 * bytes to read the build hash. We will return the remaining bytes up 566 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 567 * of bytes we will pad the value with zeros, as the section should be 568 * four byte aligned. 569 */ 570 if (sectionlen <= BUILD_ID_HEADER_LEN || 571 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 572 return (ENOENT); 573 } 574 575 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 576 for (int i = 0; i < hashlen; i++) { 577 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 578 snprintf(&buf[2*i], 3, "%02x", c); 579 } 580 581 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 582 } 583 584 SYSCTL_PROC(_kern, OID_AUTO, build_id, 585 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 586 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 587 588 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 589 "Kernel Features"); 590 591 #ifdef COMPAT_FREEBSD4 592 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 593 #endif 594 595 #ifdef COMPAT_FREEBSD5 596 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 597 #endif 598 599 #ifdef COMPAT_FREEBSD6 600 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 601 #endif 602 603 #ifdef COMPAT_FREEBSD7 604 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 605 #endif 606 607 /* 608 * This is really cheating. These actually live in the libc, something 609 * which I'm not quite sure is a good idea anyway, but in order for 610 * getnext and friends to actually work, we define dummies here. 611 * 612 * XXXRW: These probably should be CTLFLAG_CAPRD. 613 */ 614 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 615 "", 0, "PATH that finds all the standard utilities"); 616 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 617 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 618 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 619 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 620 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 621 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 622 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 623 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 624 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 625 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 626 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 627 SYSCTL_NULL_INT_PTR, 0, ""); 628 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 629 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 630 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 631 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 632 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 633 SYSCTL_NULL_INT_PTR, 0, 634 "The version of POSIX 1003.2 with which the system attempts to comply"); 635 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 636 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 637 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 638 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 639 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 640 SYSCTL_NULL_INT_PTR, 0, ""); 641 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 642 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 643 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 644 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 645 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 646 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 647 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 648 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 649 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 650 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 651 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 652 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 653 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 654 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 655 656 #include <sys/vnode.h> 657 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 658 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 659 660 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 661 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 662 663 static int 664 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 665 { 666 int error, pm; 667 668 pm = pid_max; 669 error = sysctl_handle_int(oidp, &pm, 0, req); 670 if (error || !req->newptr) 671 return (error); 672 sx_xlock(&proctree_lock); 673 sx_xlock(&allproc_lock); 674 675 /* 676 * Only permit the values less then PID_MAX. 677 * As a safety measure, do not allow to limit the pid_max too much. 678 */ 679 if (pm < 300 || pm > PID_MAX) 680 error = EINVAL; 681 else 682 pid_max = pm; 683 sx_xunlock(&allproc_lock); 684 sx_xunlock(&proctree_lock); 685 return (error); 686 } 687 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 688 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 689 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 690 691 #include <sys/bio.h> 692 #include <sys/buf.h> 693 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 694 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 695 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 696 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 697 698 #include <sys/user.h> 699 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 700 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 701 702 /* Used by kernel debuggers. */ 703 const int pcb_size = sizeof(struct pcb); 704 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 705 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 706 707 /* XXX compatibility, remove for 6.0 */ 708 #include <sys/imgact.h> 709 #include <sys/imgact_elf.h> 710 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 711 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 712 "compatibility for kern.fallback_elf_brand"); 713