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 #include "opt_posix.h" 42 #include "opt_config.h" 43 44 #include <sys/param.h> 45 #include <sys/boot.h> 46 #include <sys/elf.h> 47 #include <sys/jail.h> 48 #include <sys/kernel.h> 49 #include <sys/limits.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/proc.h> 53 #include <sys/random.h> 54 #include <sys/sbuf.h> 55 #include <sys/smp.h> 56 #include <sys/sx.h> 57 #include <sys/sysent.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 #ifdef COMPAT_FREEBSD12 148 static int 149 sysctl_maxphys(SYSCTL_HANDLER_ARGS) 150 { 151 u_long lvalue; 152 int ivalue; 153 154 lvalue = maxphys; 155 if (sizeof(int) == sizeof(u_long) || req->oldlen >= sizeof(u_long)) 156 return (sysctl_handle_long(oidp, &lvalue, 0, req)); 157 if (lvalue > INT_MAX) 158 return (sysctl_handle_long(oidp, &lvalue, 0, req)); 159 ivalue = lvalue; 160 return (sysctl_handle_int(oidp, &ivalue, 0, req)); 161 } 162 SYSCTL_PROC(_kern, KERN_MAXPHYS, maxphys, CTLTYPE_LONG | CTLFLAG_RDTUN | 163 CTLFLAG_NOFETCH | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 164 NULL, 0, sysctl_maxphys, "UL", "Maximum block I/O access size"); 165 #else 166 SYSCTL_ULONG(_kern, KERN_MAXPHYS, maxphys, 167 CTLFLAG_RDTUN | CTLFLAG_NOFETCH | CTLFLAG_CAPRD, 168 &maxphys, 0, "Maximum block I/O access size"); 169 #endif 170 171 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD, 172 &mp_ncpus, 0, "Number of active CPUs"); 173 174 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD, 175 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order"); 176 177 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD, 178 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size"); 179 180 static int 181 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 182 { 183 char buf[256]; 184 size_t len; 185 186 len = MIN(req->oldlen, sizeof(buf)); 187 read_random(buf, len); 188 return (SYSCTL_OUT(req, buf, len)); 189 } 190 191 SYSCTL_PROC(_kern, KERN_ARND, arandom, 192 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0, 193 sysctl_kern_arnd, "", "arc4rand"); 194 195 static int 196 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 197 { 198 u_long val, p; 199 200 p = SIZE_T_MAX >> PAGE_SHIFT; 201 if (physmem < p) 202 p = physmem; 203 val = ctob(p); 204 return (sysctl_handle_long(oidp, &val, 0, req)); 205 } 206 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, 207 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 208 sysctl_hw_physmem, "LU", 209 "Amount of physical memory (in bytes)"); 210 211 static int 212 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 213 { 214 u_long val, p; 215 216 p = SIZE_T_MAX >> PAGE_SHIFT; 217 if (realmem < p) 218 p = realmem; 219 val = ctob(p); 220 return (sysctl_handle_long(oidp, &val, 0, req)); 221 } 222 SYSCTL_PROC(_hw, HW_REALMEM, realmem, 223 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 224 sysctl_hw_realmem, "LU", 225 "Amount of memory (in bytes) reported by the firmware"); 226 227 static int 228 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 229 { 230 u_long val, p, p1; 231 232 p1 = physmem - vm_wire_count(); 233 p = SIZE_T_MAX >> PAGE_SHIFT; 234 if (p1 < p) 235 p = p1; 236 val = ctob(p); 237 return (sysctl_handle_long(oidp, &val, 0, req)); 238 } 239 SYSCTL_PROC(_hw, HW_USERMEM, usermem, 240 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 241 sysctl_hw_usermem, "LU", 242 "Amount of memory (in bytes) which is not wired"); 243 244 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, 245 "Amount of physical memory (in pages)"); 246 247 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE }; 248 249 static int 250 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS) 251 { 252 int error; 253 size_t len; 254 #ifdef SCTL_MASK32 255 int i; 256 uint32_t pagesizes32[MAXPAGESIZES]; 257 258 if (req->flags & SCTL_MASK32) { 259 /* 260 * Recreate the "pagesizes" array with 32-bit elements. 261 * Truncate any page size greater than UINT32_MAX to zero, 262 * which assumes that page sizes are powers of two. 263 */ 264 for (i = 0; i < MAXPAGESIZES; i++) 265 pagesizes32[i] = (uint32_t)pagesizes[i]; 266 267 len = sizeof(pagesizes32); 268 if (len > req->oldlen && req->oldptr != NULL) 269 len = req->oldlen; 270 error = SYSCTL_OUT(req, pagesizes32, len); 271 } else 272 #endif 273 { 274 len = sizeof(pagesizes); 275 if (len > req->oldlen && req->oldptr != NULL) 276 len = req->oldlen; 277 error = SYSCTL_OUT(req, pagesizes, len); 278 } 279 return (error); 280 } 281 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, 282 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 283 sysctl_hw_pagesizes, "S,pagesizes", 284 "Supported page sizes"); 285 286 int adaptive_machine_arch = 1; 287 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 288 &adaptive_machine_arch, 1, 289 "Adapt reported machine architecture to the ABI of the binary"); 290 291 static const char * 292 proc_machine_arch(struct proc *p) 293 { 294 295 if (p->p_sysent->sv_machine_arch != NULL) 296 return (p->p_sysent->sv_machine_arch(p)); 297 #ifdef COMPAT_FREEBSD32 298 if (SV_PROC_FLAG(p, SV_ILP32)) 299 return (MACHINE_ARCH32); 300 #endif 301 return (MACHINE_ARCH); 302 } 303 304 static int 305 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 306 { 307 const char *machine_arch; 308 309 if (adaptive_machine_arch) 310 machine_arch = proc_machine_arch(curproc); 311 else 312 machine_arch = MACHINE_ARCH; 313 return (SYSCTL_OUT(req, machine_arch, strlen(machine_arch) + 1)); 314 } 315 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 316 CTLFLAG_CAPRD | CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 317 "System architecture"); 318 319 #ifndef MACHINE_ARCHES 320 #ifdef COMPAT_FREEBSD32 321 #define MACHINE_ARCHES MACHINE_ARCH " " MACHINE_ARCH32 322 #else 323 #define MACHINE_ARCHES MACHINE_ARCH 324 #endif 325 #endif 326 327 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE, 328 MACHINE_ARCHES, 0, "Supported architectures for binaries"); 329 330 static int 331 sysctl_hostname(SYSCTL_HANDLER_ARGS) 332 { 333 struct prison *pr, *cpr; 334 size_t pr_offset; 335 char tmpname[MAXHOSTNAMELEN]; 336 int descend, error, len; 337 338 /* 339 * This function can set: hostname domainname hostuuid. 340 * Keep that in mind when comments say "hostname". 341 */ 342 pr_offset = (size_t)arg1; 343 len = arg2; 344 KASSERT(len <= sizeof(tmpname), 345 ("length %d too long for %s", len, __func__)); 346 347 /* 348 * Make a local copy of hostname to get/set so we don't have to hold 349 * the jail mutex during the sysctl copyin/copyout activities. 350 */ 351 pr = req->td->td_ucred->cr_prison; 352 mtx_lock(&pr->pr_mtx); 353 bcopy((char *)pr + pr_offset, tmpname, len); 354 mtx_unlock(&pr->pr_mtx); 355 356 error = sysctl_handle_string(oidp, tmpname, len, req); 357 if (error != 0 || req->newptr == NULL) 358 return (error); 359 360 /* 361 * Copy the locally set hostname to all jails that share 362 * this host info. 363 */ 364 sx_slock(&allprison_lock); 365 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME)) 366 error = EPERM; 367 else { 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 } 379 sx_sunlock(&allprison_lock); 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 mtx_lock(&pr->pr_mtx); 469 tmpid = pr->pr_hostid; 470 mtx_unlock(&pr->pr_mtx); 471 472 error = sysctl_handle_long(oidp, &tmpid, 0, req); 473 if (error != 0 || req->newptr == NULL) 474 return (error); 475 476 sx_slock(&allprison_lock); 477 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME)) 478 error = EPERM; 479 else { 480 while (!(pr->pr_flags & PR_HOST)) 481 pr = pr->pr_parent; 482 mtx_lock(&pr->pr_mtx); 483 pr->pr_hostid = tmpid; 484 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 485 if (cpr->pr_flags & PR_HOST) 486 descend = 0; 487 else 488 cpr->pr_hostid = tmpid; 489 mtx_unlock(&pr->pr_mtx); 490 } 491 sx_sunlock(&allprison_lock); 492 return (error); 493 } 494 495 SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 496 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 497 NULL, 0, sysctl_hostid, "LU", "Host ID"); 498 499 static struct mtx bootid_lk; 500 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF); 501 502 static int 503 sysctl_bootid(SYSCTL_HANDLER_ARGS) 504 { 505 static uint8_t boot_id[16]; 506 static bool initialized = false; 507 508 mtx_lock(&bootid_lk); 509 if (!initialized) { 510 if (!is_random_seeded()) { 511 mtx_unlock(&bootid_lk); 512 return (ENXIO); 513 } 514 arc4random_buf(boot_id, sizeof(boot_id)); 515 initialized = true; 516 } 517 mtx_unlock(&bootid_lk); 518 519 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id))); 520 } 521 SYSCTL_PROC(_kern, OID_AUTO, boot_id, 522 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 523 NULL, 0, sysctl_bootid, "", "Random boot ID"); 524 525 /* 526 * The osrelease string is copied from the global (osrelease in vers.c) into 527 * prison0 by a sysinit and is inherited by child jails if not changed at jail 528 * creation, so we always return the copy from the current prison data. 529 */ 530 static int 531 sysctl_osrelease(SYSCTL_HANDLER_ARGS) 532 { 533 struct prison *pr; 534 535 pr = req->td->td_ucred->cr_prison; 536 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 537 538 } 539 540 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 541 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 542 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 543 544 /* 545 * The osreldate number is copied from the global (osreldate in vers.c) into 546 * prison0 by a sysinit and is inherited by child jails if not changed at jail 547 * creation, so we always return the value from the current prison data. 548 */ 549 static int 550 sysctl_osreldate(SYSCTL_HANDLER_ARGS) 551 { 552 struct prison *pr; 553 554 pr = req->td->td_ucred->cr_prison; 555 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 556 557 } 558 559 /* 560 * NOTICE: The *userland* release date is available in 561 * /usr/include/osreldate.h 562 */ 563 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 564 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 565 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 566 567 /* 568 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 569 * script defines two variables to expose the beginning and end. LLVM 570 * currently uses a SHA-1 hash, but other formats can be supported by checking 571 * the length of the section. 572 */ 573 574 extern char __build_id_start[]; 575 extern char __build_id_end[]; 576 577 #define BUILD_ID_HEADER_LEN 0x10 578 #define BUILD_ID_HASH_MAXLEN 0x14 579 580 static int 581 sysctl_build_id(SYSCTL_HANDLER_ARGS) 582 { 583 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 584 int hashlen; 585 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 586 587 /* 588 * The ELF note section has a four byte length for the vendor name, 589 * four byte length for the value, and a four byte vendor specific 590 * type. The name for the build id is "GNU\0". We skip the first 16 591 * bytes to read the build hash. We will return the remaining bytes up 592 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 593 * of bytes we will pad the value with zeros, as the section should be 594 * four byte aligned. 595 */ 596 if (sectionlen <= BUILD_ID_HEADER_LEN || 597 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 598 return (ENOENT); 599 } 600 601 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 602 for (int i = 0; i < hashlen; i++) { 603 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 604 snprintf(&buf[2*i], 3, "%02x", c); 605 } 606 607 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 608 } 609 610 SYSCTL_PROC(_kern, OID_AUTO, build_id, 611 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 612 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 613 614 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 615 "Kernel Features"); 616 617 #ifdef COMPAT_FREEBSD4 618 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 619 #endif 620 621 #ifdef COMPAT_FREEBSD5 622 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 623 #endif 624 625 #ifdef COMPAT_FREEBSD6 626 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 627 #endif 628 629 #ifdef COMPAT_FREEBSD7 630 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 631 #endif 632 633 /* 634 * This is really cheating. These actually live in the libc, something 635 * which I'm not quite sure is a good idea anyway, but in order for 636 * getnext and friends to actually work, we define dummies here. 637 * 638 * XXXRW: These probably should be CTLFLAG_CAPRD. 639 */ 640 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 641 "", 0, "PATH that finds all the standard utilities"); 642 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 643 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 644 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 645 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 646 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 647 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 648 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 649 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 650 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 651 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 652 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 653 SYSCTL_NULL_INT_PTR, 0, ""); 654 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 655 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 656 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 657 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 658 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 659 SYSCTL_NULL_INT_PTR, 0, 660 "The version of POSIX 1003.2 with which the system attempts to comply"); 661 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 662 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 663 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 664 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 665 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 666 SYSCTL_NULL_INT_PTR, 0, ""); 667 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 668 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 669 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 670 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 671 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 672 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 673 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 674 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 675 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 676 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 677 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 678 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 679 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 680 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 681 682 static char localbase[MAXPATHLEN] = ""; 683 684 SYSCTL_STRING(_user, USER_LOCALBASE, localbase, CTLFLAG_RWTUN, 685 localbase, sizeof(localbase), "Prefix used to install and locate add-on packages"); 686 687 #include <sys/vnode.h> 688 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 689 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 690 691 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 692 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 693 694 static int 695 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 696 { 697 int error, pm; 698 699 pm = pid_max; 700 error = sysctl_handle_int(oidp, &pm, 0, req); 701 if (error || !req->newptr) 702 return (error); 703 sx_xlock(&proctree_lock); 704 sx_xlock(&allproc_lock); 705 706 /* 707 * Only permit the values less then PID_MAX. 708 * As a safety measure, do not allow to limit the pid_max too much. 709 */ 710 if (pm < 300 || pm > PID_MAX) 711 error = EINVAL; 712 else 713 pid_max = pm; 714 sx_xunlock(&allproc_lock); 715 sx_xunlock(&proctree_lock); 716 return (error); 717 } 718 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 719 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 720 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 721 722 #include <sys/bio.h> 723 #include <sys/buf.h> 724 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 725 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 726 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 727 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 728 729 #include <sys/user.h> 730 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 731 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 732 733 /* Used by kernel debuggers. */ 734 const int pcb_size = sizeof(struct pcb); 735 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 736 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 737 738 /* XXX compatibility, remove for 6.0 */ 739 #include <sys/imgact.h> 740 #include <sys/imgact_elf.h> 741 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 742 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 743 "compatibility for kern.fallback_elf_brand"); 744