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 #ifdef COMPAT_FREEBSD12 150 static int 151 sysctl_maxphys(SYSCTL_HANDLER_ARGS) 152 { 153 u_long lvalue; 154 int ivalue; 155 156 lvalue = maxphys; 157 if (sizeof(int) == sizeof(u_long) || req->oldlen >= sizeof(u_long)) 158 return (sysctl_handle_long(oidp, &lvalue, 0, req)); 159 if (lvalue > INT_MAX) 160 return (sysctl_handle_long(oidp, &lvalue, 0, req)); 161 ivalue = lvalue; 162 return (sysctl_handle_int(oidp, &ivalue, 0, req)); 163 } 164 SYSCTL_PROC(_kern, KERN_MAXPHYS, maxphys, CTLTYPE_LONG | CTLFLAG_RDTUN | 165 CTLFLAG_NOFETCH | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 166 NULL, 0, sysctl_maxphys, "UL", "Maximum block I/O access size"); 167 #else 168 SYSCTL_ULONG(_kern, KERN_MAXPHYS, maxphys, 169 CTLFLAG_RDTUN | CTLFLAG_NOFETCH | CTLFLAG_CAPRD, 170 &maxphys, 0, "Maximum block I/O access size"); 171 #endif 172 173 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD, 174 &mp_ncpus, 0, "Number of active CPUs"); 175 176 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD, 177 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order"); 178 179 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD, 180 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size"); 181 182 static int 183 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 184 { 185 char buf[256]; 186 size_t len; 187 188 len = MIN(req->oldlen, sizeof(buf)); 189 read_random(buf, len); 190 return (SYSCTL_OUT(req, buf, len)); 191 } 192 193 SYSCTL_PROC(_kern, KERN_ARND, arandom, 194 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0, 195 sysctl_kern_arnd, "", "arc4rand"); 196 197 static int 198 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 199 { 200 u_long val, p; 201 202 p = SIZE_T_MAX >> PAGE_SHIFT; 203 if (physmem < p) 204 p = physmem; 205 val = ctob(p); 206 return (sysctl_handle_long(oidp, &val, 0, req)); 207 } 208 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, 209 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 210 sysctl_hw_physmem, "LU", 211 "Amount of physical memory (in bytes)"); 212 213 static int 214 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 215 { 216 u_long val, p; 217 218 p = SIZE_T_MAX >> PAGE_SHIFT; 219 if (realmem < p) 220 p = realmem; 221 val = ctob(p); 222 return (sysctl_handle_long(oidp, &val, 0, req)); 223 } 224 SYSCTL_PROC(_hw, HW_REALMEM, realmem, 225 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 226 sysctl_hw_realmem, "LU", 227 "Amount of memory (in bytes) reported by the firmware"); 228 229 static int 230 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 231 { 232 u_long val, p, p1; 233 234 p1 = physmem - vm_wire_count(); 235 p = SIZE_T_MAX >> PAGE_SHIFT; 236 if (p1 < p) 237 p = p1; 238 val = ctob(p); 239 return (sysctl_handle_long(oidp, &val, 0, req)); 240 } 241 SYSCTL_PROC(_hw, HW_USERMEM, usermem, 242 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 243 sysctl_hw_usermem, "LU", 244 "Amount of memory (in bytes) which is not wired"); 245 246 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, 247 "Amount of physical memory (in pages)"); 248 249 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE }; 250 251 static int 252 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS) 253 { 254 int error; 255 size_t len; 256 #ifdef SCTL_MASK32 257 int i; 258 uint32_t pagesizes32[MAXPAGESIZES]; 259 260 if (req->flags & SCTL_MASK32) { 261 /* 262 * Recreate the "pagesizes" array with 32-bit elements. 263 * Truncate any page size greater than UINT32_MAX to zero, 264 * which assumes that page sizes are powers of two. 265 */ 266 for (i = 0; i < MAXPAGESIZES; i++) 267 pagesizes32[i] = (uint32_t)pagesizes[i]; 268 269 len = sizeof(pagesizes32); 270 if (len > req->oldlen && req->oldptr != NULL) 271 len = req->oldlen; 272 error = SYSCTL_OUT(req, pagesizes32, len); 273 } else 274 #endif 275 { 276 len = sizeof(pagesizes); 277 if (len > req->oldlen && req->oldptr != NULL) 278 len = req->oldlen; 279 error = SYSCTL_OUT(req, pagesizes, len); 280 } 281 return (error); 282 } 283 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, 284 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 285 sysctl_hw_pagesizes, "S,pagesizes", 286 "Supported page sizes"); 287 288 int adaptive_machine_arch = 1; 289 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 290 &adaptive_machine_arch, 1, 291 "Adapt reported machine architecture to the ABI of the binary"); 292 293 static const char * 294 proc_machine_arch(struct proc *p) 295 { 296 297 if (p->p_sysent->sv_machine_arch != NULL) 298 return (p->p_sysent->sv_machine_arch(p)); 299 #ifdef COMPAT_FREEBSD32 300 if (SV_PROC_FLAG(p, SV_ILP32)) 301 return (MACHINE_ARCH32); 302 #endif 303 return (MACHINE_ARCH); 304 } 305 306 static int 307 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 308 { 309 const char *machine_arch; 310 311 if (adaptive_machine_arch) 312 machine_arch = proc_machine_arch(curproc); 313 else 314 machine_arch = MACHINE_ARCH; 315 return (SYSCTL_OUT(req, machine_arch, strlen(machine_arch) + 1)); 316 } 317 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 318 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 319 "System architecture"); 320 321 #ifndef MACHINE_ARCHES 322 #ifdef COMPAT_FREEBSD32 323 #define MACHINE_ARCHES MACHINE_ARCH " " MACHINE_ARCH32 324 #else 325 #define MACHINE_ARCHES MACHINE_ARCH 326 #endif 327 #endif 328 329 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE, 330 MACHINE_ARCHES, 0, "Supported architectures for binaries"); 331 332 static int 333 sysctl_hostname(SYSCTL_HANDLER_ARGS) 334 { 335 struct prison *pr, *cpr; 336 size_t pr_offset; 337 char tmpname[MAXHOSTNAMELEN]; 338 int descend, error, len; 339 340 /* 341 * This function can set: hostname domainname hostuuid. 342 * Keep that in mind when comments say "hostname". 343 */ 344 pr_offset = (size_t)arg1; 345 len = arg2; 346 KASSERT(len <= sizeof(tmpname), 347 ("length %d too long for %s", len, __func__)); 348 349 pr = req->td->td_ucred->cr_prison; 350 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 351 return (EPERM); 352 /* 353 * Make a local copy of hostname to get/set so we don't have to hold 354 * the jail mutex during the sysctl copyin/copyout activities. 355 */ 356 mtx_lock(&pr->pr_mtx); 357 bcopy((char *)pr + pr_offset, tmpname, len); 358 mtx_unlock(&pr->pr_mtx); 359 360 error = sysctl_handle_string(oidp, tmpname, len, req); 361 362 if (req->newptr != NULL && error == 0) { 363 /* 364 * Copy the locally set hostname to all jails that share 365 * this host info. 366 */ 367 sx_slock(&allprison_lock); 368 while (!(pr->pr_flags & PR_HOST)) 369 pr = pr->pr_parent; 370 mtx_lock(&pr->pr_mtx); 371 bcopy(tmpname, (char *)pr + pr_offset, len); 372 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 373 if (cpr->pr_flags & PR_HOST) 374 descend = 0; 375 else 376 bcopy(tmpname, (char *)cpr + pr_offset, len); 377 mtx_unlock(&pr->pr_mtx); 378 sx_sunlock(&allprison_lock); 379 } 380 return (error); 381 } 382 383 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 384 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 385 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN, 386 sysctl_hostname, "A", "Hostname"); 387 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, 388 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 389 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN, 390 sysctl_hostname, "A", "Name of the current YP/NIS domain"); 391 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid, 392 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 393 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN, 394 sysctl_hostname, "A", "Host UUID"); 395 396 static int regression_securelevel_nonmonotonic = 0; 397 398 #ifdef REGRESSION 399 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 400 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 401 #endif 402 403 static int 404 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 405 { 406 struct prison *pr, *cpr; 407 int descend, error, level; 408 409 pr = req->td->td_ucred->cr_prison; 410 411 /* 412 * Reading the securelevel is easy, since the current jail's level 413 * is known to be at least as secure as any higher levels. Perform 414 * a lockless read since the securelevel is an integer. 415 */ 416 level = pr->pr_securelevel; 417 error = sysctl_handle_int(oidp, &level, 0, req); 418 if (error || !req->newptr) 419 return (error); 420 /* Permit update only if the new securelevel exceeds the old. */ 421 sx_slock(&allprison_lock); 422 mtx_lock(&pr->pr_mtx); 423 if (!regression_securelevel_nonmonotonic && 424 level < pr->pr_securelevel) { 425 mtx_unlock(&pr->pr_mtx); 426 sx_sunlock(&allprison_lock); 427 return (EPERM); 428 } 429 pr->pr_securelevel = level; 430 /* 431 * Set all child jails to be at least this level, but do not lower 432 * them (even if regression_securelevel_nonmonotonic). 433 */ 434 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 435 if (cpr->pr_securelevel < level) 436 cpr->pr_securelevel = level; 437 } 438 mtx_unlock(&pr->pr_mtx); 439 sx_sunlock(&allprison_lock); 440 return (error); 441 } 442 443 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 444 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 0, 0, 445 sysctl_kern_securelvl, "I", 446 "Current secure level"); 447 448 #ifdef INCLUDE_CONFIG_FILE 449 /* Actual kernel configuration options. */ 450 extern char kernconfstring[]; 451 452 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE, 453 kernconfstring, 0, "Kernel configuration file"); 454 #endif 455 456 static int 457 sysctl_hostid(SYSCTL_HANDLER_ARGS) 458 { 459 struct prison *pr, *cpr; 460 u_long tmpid; 461 int descend, error; 462 463 /* 464 * Like sysctl_hostname, except it operates on a u_long 465 * instead of a string, and is used only for hostid. 466 */ 467 pr = req->td->td_ucred->cr_prison; 468 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 469 return (EPERM); 470 tmpid = pr->pr_hostid; 471 error = sysctl_handle_long(oidp, &tmpid, 0, req); 472 473 if (req->newptr != NULL && error == 0) { 474 sx_slock(&allprison_lock); 475 while (!(pr->pr_flags & PR_HOST)) 476 pr = pr->pr_parent; 477 mtx_lock(&pr->pr_mtx); 478 pr->pr_hostid = tmpid; 479 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 480 if (cpr->pr_flags & PR_HOST) 481 descend = 0; 482 else 483 cpr->pr_hostid = tmpid; 484 mtx_unlock(&pr->pr_mtx); 485 sx_sunlock(&allprison_lock); 486 } 487 return (error); 488 } 489 490 SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 491 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 492 NULL, 0, sysctl_hostid, "LU", "Host ID"); 493 494 static struct mtx bootid_lk; 495 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF); 496 497 static int 498 sysctl_bootid(SYSCTL_HANDLER_ARGS) 499 { 500 static uint8_t boot_id[16]; 501 static bool initialized = false; 502 503 mtx_lock(&bootid_lk); 504 if (!initialized) { 505 if (!is_random_seeded()) { 506 mtx_unlock(&bootid_lk); 507 return (ENXIO); 508 } 509 arc4random_buf(boot_id, sizeof(boot_id)); 510 initialized = true; 511 } 512 mtx_unlock(&bootid_lk); 513 514 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id))); 515 } 516 SYSCTL_PROC(_kern, OID_AUTO, boot_id, 517 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 518 NULL, 0, sysctl_bootid, "", "Random boot ID"); 519 520 /* 521 * The osrelease string is copied from the global (osrelease in vers.c) into 522 * prison0 by a sysinit and is inherited by child jails if not changed at jail 523 * creation, so we always return the copy from the current prison data. 524 */ 525 static int 526 sysctl_osrelease(SYSCTL_HANDLER_ARGS) 527 { 528 struct prison *pr; 529 530 pr = req->td->td_ucred->cr_prison; 531 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 532 533 } 534 535 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 536 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 537 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 538 539 /* 540 * The osreldate number is copied from the global (osreldate in vers.c) into 541 * prison0 by a sysinit and is inherited by child jails if not changed at jail 542 * creation, so we always return the value from the current prison data. 543 */ 544 static int 545 sysctl_osreldate(SYSCTL_HANDLER_ARGS) 546 { 547 struct prison *pr; 548 549 pr = req->td->td_ucred->cr_prison; 550 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 551 552 } 553 554 /* 555 * NOTICE: The *userland* release date is available in 556 * /usr/include/osreldate.h 557 */ 558 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 559 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 560 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 561 562 /* 563 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 564 * script defines two variables to expose the beginning and end. LLVM 565 * currently uses a SHA-1 hash, but other formats can be supported by checking 566 * the length of the section. 567 */ 568 569 extern char __build_id_start[]; 570 extern char __build_id_end[]; 571 572 #define BUILD_ID_HEADER_LEN 0x10 573 #define BUILD_ID_HASH_MAXLEN 0x14 574 575 static int 576 sysctl_build_id(SYSCTL_HANDLER_ARGS) 577 { 578 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 579 int hashlen; 580 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 581 582 /* 583 * The ELF note section has a four byte length for the vendor name, 584 * four byte length for the value, and a four byte vendor specific 585 * type. The name for the build id is "GNU\0". We skip the first 16 586 * bytes to read the build hash. We will return the remaining bytes up 587 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 588 * of bytes we will pad the value with zeros, as the section should be 589 * four byte aligned. 590 */ 591 if (sectionlen <= BUILD_ID_HEADER_LEN || 592 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 593 return (ENOENT); 594 } 595 596 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 597 for (int i = 0; i < hashlen; i++) { 598 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 599 snprintf(&buf[2*i], 3, "%02x", c); 600 } 601 602 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 603 } 604 605 SYSCTL_PROC(_kern, OID_AUTO, build_id, 606 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 607 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 608 609 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 610 "Kernel Features"); 611 612 #ifdef COMPAT_FREEBSD4 613 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 614 #endif 615 616 #ifdef COMPAT_FREEBSD5 617 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 618 #endif 619 620 #ifdef COMPAT_FREEBSD6 621 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 622 #endif 623 624 #ifdef COMPAT_FREEBSD7 625 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 626 #endif 627 628 /* 629 * This is really cheating. These actually live in the libc, something 630 * which I'm not quite sure is a good idea anyway, but in order for 631 * getnext and friends to actually work, we define dummies here. 632 * 633 * XXXRW: These probably should be CTLFLAG_CAPRD. 634 */ 635 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 636 "", 0, "PATH that finds all the standard utilities"); 637 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 638 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 639 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 640 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 641 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 642 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 643 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 644 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 645 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 646 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 647 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 648 SYSCTL_NULL_INT_PTR, 0, ""); 649 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 650 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 651 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 652 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 653 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 654 SYSCTL_NULL_INT_PTR, 0, 655 "The version of POSIX 1003.2 with which the system attempts to comply"); 656 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 657 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 658 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 659 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 660 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 661 SYSCTL_NULL_INT_PTR, 0, ""); 662 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 663 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 664 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 665 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 666 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 667 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 668 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 669 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 670 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 671 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 672 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 673 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 674 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 675 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 676 677 static char localbase[MAXPATHLEN] = ""; 678 679 SYSCTL_STRING(_user, USER_LOCALBASE, localbase, CTLFLAG_RWTUN, 680 localbase, sizeof(localbase), "Prefix used to install and locate add-on packages"); 681 682 #include <sys/vnode.h> 683 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 684 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 685 686 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 687 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 688 689 static int 690 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 691 { 692 int error, pm; 693 694 pm = pid_max; 695 error = sysctl_handle_int(oidp, &pm, 0, req); 696 if (error || !req->newptr) 697 return (error); 698 sx_xlock(&proctree_lock); 699 sx_xlock(&allproc_lock); 700 701 /* 702 * Only permit the values less then PID_MAX. 703 * As a safety measure, do not allow to limit the pid_max too much. 704 */ 705 if (pm < 300 || pm > PID_MAX) 706 error = EINVAL; 707 else 708 pid_max = pm; 709 sx_xunlock(&allproc_lock); 710 sx_xunlock(&proctree_lock); 711 return (error); 712 } 713 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 714 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 715 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 716 717 #include <sys/bio.h> 718 #include <sys/buf.h> 719 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 720 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 721 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 722 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 723 724 #include <sys/user.h> 725 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 726 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 727 728 /* Used by kernel debuggers. */ 729 const int pcb_size = sizeof(struct pcb); 730 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 731 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 732 733 /* XXX compatibility, remove for 6.0 */ 734 #include <sys/imgact.h> 735 #include <sys/imgact_elf.h> 736 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 737 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 738 "compatibility for kern.fallback_elf_brand"); 739