1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Mike Karels at Berkeley Software Design, Inc. 9 * 10 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD 11 * project, to make these variables more userfriendly. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_posix.h" 44 #include "opt_config.h" 45 46 #include <sys/param.h> 47 #include <sys/boot.h> 48 #include <sys/jail.h> 49 #include <sys/kernel.h> 50 #include <sys/limits.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/proc.h> 54 #include <sys/random.h> 55 #include <sys/sbuf.h> 56 #include <sys/smp.h> 57 #include <sys/sx.h> 58 #include <sys/vmmeter.h> 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 #include <sys/unistd.h> 62 63 SYSCTL_ROOT_NODE(0, sysctl, CTLFLAG_RW, 0, 64 "Sysctl internal magic"); 65 SYSCTL_ROOT_NODE(CTL_KERN, kern, CTLFLAG_RW|CTLFLAG_CAPRD, 0, 66 "High kernel, proc, limits &c"); 67 SYSCTL_ROOT_NODE(CTL_VM, vm, CTLFLAG_RW, 0, 68 "Virtual memory"); 69 SYSCTL_ROOT_NODE(CTL_VFS, vfs, CTLFLAG_RW, 0, 70 "File system"); 71 SYSCTL_ROOT_NODE(CTL_NET, net, CTLFLAG_RW, 0, 72 "Network, (see socket.h)"); 73 SYSCTL_ROOT_NODE(CTL_DEBUG, debug, CTLFLAG_RW, 0, 74 "Debugging"); 75 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 76 "Sizeof various things"); 77 SYSCTL_ROOT_NODE(CTL_HW, hw, CTLFLAG_RW, 0, 78 "hardware"); 79 SYSCTL_ROOT_NODE(CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 80 "machine dependent"); 81 SYSCTL_ROOT_NODE(CTL_USER, user, CTLFLAG_RW, 0, 82 "user-level"); 83 SYSCTL_ROOT_NODE(CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 84 "p1003_1b, (see p1003_1b.h)"); 85 86 SYSCTL_ROOT_NODE(OID_AUTO, compat, CTLFLAG_RW, 0, 87 "Compatibility code"); 88 SYSCTL_ROOT_NODE(OID_AUTO, security, CTLFLAG_RW, 0, 89 "Security"); 90 #ifdef REGRESSION 91 SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW, 0, 92 "Regression test MIB"); 93 #endif 94 95 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE, 96 kern_ident, 0, "Kernel identifier"); 97 98 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD|CTLFLAG_CAPRD, 99 SYSCTL_NULL_INT_PTR, BSD, "Operating system revision"); 100 101 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE, 102 version, 0, "Kernel version"); 103 104 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD|CTLFLAG_MPSAFE, 105 compiler_version, 0, "Version of compiler used to compile kernel"); 106 107 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE| 108 CTLFLAG_CAPRD, ostype, 0, "Operating system type"); 109 110 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, 111 &maxproc, 0, "Maximum number of processes"); 112 113 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 114 &maxprocperuid, 0, "Maximum processes allowed per userid"); 115 116 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, 117 &maxusers, 0, "Hint for kernel tuning"); 118 119 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD|CTLFLAG_CAPRD, 120 SYSCTL_NULL_INT_PTR, ARG_MAX, "Maximum bytes of argument to execve(2)"); 121 122 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD|CTLFLAG_CAPRD, 123 SYSCTL_NULL_INT_PTR, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 124 125 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN | 126 CTLFLAG_NOFETCH | CTLFLAG_CAPRD, &ngroups_max, 0, 127 "Maximum number of supplemental groups a user can belong to"); 128 129 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD|CTLFLAG_CAPRD, 130 SYSCTL_NULL_INT_PTR, 1, "Whether job control is available"); 131 132 #ifdef _POSIX_SAVED_IDS 133 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD, 134 SYSCTL_NULL_INT_PTR, 1, "Whether saved set-group/user ID is available"); 135 #else 136 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD, 137 SYSCTL_NULL_INT_PTR, 0, "Whether saved set-group/user ID is available"); 138 #endif 139 140 char kernelname[MAXPATHLEN] = PATH_KERNEL; /* XXX bloat */ 141 142 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW | CTLFLAG_MPSAFE, 143 kernelname, sizeof kernelname, "Name of kernel file booted"); 144 145 SYSCTL_INT(_kern, KERN_MAXPHYS, maxphys, CTLFLAG_RD | CTLFLAG_CAPRD, 146 SYSCTL_NULL_INT_PTR, MAXPHYS, "Maximum block I/O access size"); 147 148 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD, 149 &mp_ncpus, 0, "Number of active CPUs"); 150 151 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD, 152 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order"); 153 154 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD, 155 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size"); 156 157 static int 158 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 159 { 160 char buf[256]; 161 size_t len; 162 163 len = MIN(req->oldlen, sizeof(buf)); 164 read_random(buf, len); 165 return (SYSCTL_OUT(req, buf, len)); 166 } 167 168 SYSCTL_PROC(_kern, KERN_ARND, arandom, 169 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0, 170 sysctl_kern_arnd, "", "arc4rand"); 171 172 static int 173 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 174 { 175 u_long val, p; 176 177 p = SIZE_T_MAX >> PAGE_SHIFT; 178 if (physmem < p) 179 p = physmem; 180 val = ctob(p); 181 return (sysctl_handle_long(oidp, &val, 0, req)); 182 } 183 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 184 0, 0, sysctl_hw_physmem, "LU", 185 "Amount of physical memory (in bytes)"); 186 187 static int 188 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 189 { 190 u_long val, p; 191 192 p = SIZE_T_MAX >> PAGE_SHIFT; 193 if (realmem < p) 194 p = realmem; 195 val = ctob(p); 196 return (sysctl_handle_long(oidp, &val, 0, req)); 197 } 198 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD, 199 0, 0, sysctl_hw_realmem, "LU", 200 "Amount of memory (in bytes) reported by the firmware"); 201 202 static int 203 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 204 { 205 u_long val, p, p1; 206 207 p1 = physmem - vm_wire_count(); 208 p = SIZE_T_MAX >> PAGE_SHIFT; 209 if (p1 < p) 210 p = p1; 211 val = ctob(p); 212 return (sysctl_handle_long(oidp, &val, 0, req)); 213 } 214 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 215 0, 0, sysctl_hw_usermem, "LU", 216 "Amount of memory (in bytes) which is not wired"); 217 218 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, 219 "Amount of physical memory (in pages)"); 220 221 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE }; 222 223 static int 224 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS) 225 { 226 int error; 227 #ifdef SCTL_MASK32 228 int i; 229 uint32_t pagesizes32[MAXPAGESIZES]; 230 231 if (req->flags & SCTL_MASK32) { 232 /* 233 * Recreate the "pagesizes" array with 32-bit elements. Truncate 234 * any page size greater than UINT32_MAX to zero. 235 */ 236 for (i = 0; i < MAXPAGESIZES; i++) 237 pagesizes32[i] = (uint32_t)pagesizes[i]; 238 239 error = SYSCTL_OUT(req, pagesizes32, sizeof(pagesizes32)); 240 } else 241 #endif 242 error = SYSCTL_OUT(req, pagesizes, sizeof(pagesizes)); 243 return (error); 244 } 245 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, CTLTYPE_ULONG | CTLFLAG_RD, 246 NULL, 0, sysctl_hw_pagesizes, "LU", "Supported page sizes"); 247 248 #ifdef SCTL_MASK32 249 int adaptive_machine_arch = 1; 250 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 251 &adaptive_machine_arch, 1, 252 "Adapt reported machine architecture to the ABI of the binary"); 253 #endif 254 255 static int 256 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 257 { 258 int error; 259 static const char machine_arch[] = MACHINE_ARCH; 260 #ifdef SCTL_MASK32 261 static const char machine_arch32[] = MACHINE_ARCH32; 262 263 if ((req->flags & SCTL_MASK32) != 0 && adaptive_machine_arch) 264 error = SYSCTL_OUT(req, machine_arch32, sizeof(machine_arch32)); 265 else 266 #endif 267 error = SYSCTL_OUT(req, machine_arch, sizeof(machine_arch)); 268 return (error); 269 270 } 271 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 272 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 273 "System architecture"); 274 275 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE, 276 #ifdef COMPAT_FREEBSD32 277 MACHINE_ARCH " " MACHINE_ARCH32, 0, "Supported architectures for binaries"); 278 #else 279 MACHINE_ARCH, 0, "Supported architectures for binaries"); 280 #endif 281 282 static int 283 sysctl_hostname(SYSCTL_HANDLER_ARGS) 284 { 285 struct prison *pr, *cpr; 286 size_t pr_offset; 287 char tmpname[MAXHOSTNAMELEN]; 288 int descend, error, len; 289 290 /* 291 * This function can set: hostname domainname hostuuid. 292 * Keep that in mind when comments say "hostname". 293 */ 294 pr_offset = (size_t)arg1; 295 len = arg2; 296 KASSERT(len <= sizeof(tmpname), 297 ("length %d too long for %s", len, __func__)); 298 299 pr = req->td->td_ucred->cr_prison; 300 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 301 return (EPERM); 302 /* 303 * Make a local copy of hostname to get/set so we don't have to hold 304 * the jail mutex during the sysctl copyin/copyout activities. 305 */ 306 mtx_lock(&pr->pr_mtx); 307 bcopy((char *)pr + pr_offset, tmpname, len); 308 mtx_unlock(&pr->pr_mtx); 309 310 error = sysctl_handle_string(oidp, tmpname, len, req); 311 312 if (req->newptr != NULL && error == 0) { 313 /* 314 * Copy the locally set hostname to all jails that share 315 * this host info. 316 */ 317 sx_slock(&allprison_lock); 318 while (!(pr->pr_flags & PR_HOST)) 319 pr = pr->pr_parent; 320 mtx_lock(&pr->pr_mtx); 321 bcopy(tmpname, (char *)pr + pr_offset, len); 322 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 323 if (cpr->pr_flags & PR_HOST) 324 descend = 0; 325 else 326 bcopy(tmpname, (char *)cpr + pr_offset, len); 327 mtx_unlock(&pr->pr_mtx); 328 sx_sunlock(&allprison_lock); 329 } 330 return (error); 331 } 332 333 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 334 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 335 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN, 336 sysctl_hostname, "A", "Hostname"); 337 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, 338 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 339 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN, 340 sysctl_hostname, "A", "Name of the current YP/NIS domain"); 341 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid, 342 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 343 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN, 344 sysctl_hostname, "A", "Host UUID"); 345 346 static int regression_securelevel_nonmonotonic = 0; 347 348 #ifdef REGRESSION 349 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 350 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 351 #endif 352 353 static int 354 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 355 { 356 struct prison *pr, *cpr; 357 int descend, error, level; 358 359 pr = req->td->td_ucred->cr_prison; 360 361 /* 362 * Reading the securelevel is easy, since the current jail's level 363 * is known to be at least as secure as any higher levels. Perform 364 * a lockless read since the securelevel is an integer. 365 */ 366 level = pr->pr_securelevel; 367 error = sysctl_handle_int(oidp, &level, 0, req); 368 if (error || !req->newptr) 369 return (error); 370 /* Permit update only if the new securelevel exceeds the old. */ 371 sx_slock(&allprison_lock); 372 mtx_lock(&pr->pr_mtx); 373 if (!regression_securelevel_nonmonotonic && 374 level < pr->pr_securelevel) { 375 mtx_unlock(&pr->pr_mtx); 376 sx_sunlock(&allprison_lock); 377 return (EPERM); 378 } 379 pr->pr_securelevel = level; 380 /* 381 * Set all child jails to be at least this level, but do not lower 382 * them (even if regression_securelevel_nonmonotonic). 383 */ 384 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 385 if (cpr->pr_securelevel < level) 386 cpr->pr_securelevel = level; 387 } 388 mtx_unlock(&pr->pr_mtx); 389 sx_sunlock(&allprison_lock); 390 return (error); 391 } 392 393 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 394 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 395 "I", "Current secure level"); 396 397 #ifdef INCLUDE_CONFIG_FILE 398 /* Actual kernel configuration options. */ 399 extern char kernconfstring[]; 400 401 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE, 402 kernconfstring, 0, "Kernel configuration file"); 403 #endif 404 405 static int 406 sysctl_hostid(SYSCTL_HANDLER_ARGS) 407 { 408 struct prison *pr, *cpr; 409 u_long tmpid; 410 int descend, error; 411 412 /* 413 * Like sysctl_hostname, except it operates on a u_long 414 * instead of a string, and is used only for hostid. 415 */ 416 pr = req->td->td_ucred->cr_prison; 417 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 418 return (EPERM); 419 tmpid = pr->pr_hostid; 420 error = sysctl_handle_long(oidp, &tmpid, 0, req); 421 422 if (req->newptr != NULL && error == 0) { 423 sx_slock(&allprison_lock); 424 while (!(pr->pr_flags & PR_HOST)) 425 pr = pr->pr_parent; 426 mtx_lock(&pr->pr_mtx); 427 pr->pr_hostid = tmpid; 428 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 429 if (cpr->pr_flags & PR_HOST) 430 descend = 0; 431 else 432 cpr->pr_hostid = tmpid; 433 mtx_unlock(&pr->pr_mtx); 434 sx_sunlock(&allprison_lock); 435 } 436 return (error); 437 } 438 439 SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 440 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 441 NULL, 0, sysctl_hostid, "LU", "Host ID"); 442 443 /* 444 * The osrelease string is copied from the global (osrelease in vers.c) into 445 * prison0 by a sysinit and is inherited by child jails if not changed at jail 446 * creation, so we always return the copy from the current prison data. 447 */ 448 static int 449 sysctl_osrelease(SYSCTL_HANDLER_ARGS) 450 { 451 struct prison *pr; 452 453 pr = req->td->td_ucred->cr_prison; 454 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 455 456 } 457 458 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 459 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 460 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 461 462 /* 463 * The osreldate number is copied from the global (osreldate in vers.c) into 464 * prison0 by a sysinit and is inherited by child jails if not changed at jail 465 * creation, so we always return the value from the current prison data. 466 */ 467 static int 468 sysctl_osreldate(SYSCTL_HANDLER_ARGS) 469 { 470 struct prison *pr; 471 472 pr = req->td->td_ucred->cr_prison; 473 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 474 475 } 476 477 /* 478 * NOTICE: The *userland* release date is available in 479 * /usr/include/osreldate.h 480 */ 481 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 482 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 483 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 484 485 /* 486 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 487 * script defines two variables to expose the beginning and end. LLVM 488 * currently uses a SHA-1 hash, but other formats can be supported by checking 489 * the length of the section. 490 */ 491 492 extern char __build_id_start[]; 493 extern char __build_id_end[]; 494 495 #define BUILD_ID_HEADER_LEN 0x10 496 #define BUILD_ID_HASH_MAXLEN 0x14 497 498 static int 499 sysctl_build_id(SYSCTL_HANDLER_ARGS) 500 { 501 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 502 int hashlen; 503 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 504 505 /* 506 * The ELF note section has a four byte length for the vendor name, 507 * four byte length for the value, and a four byte vendor specific 508 * type. The name for the build id is "GNU\0". We skip the first 16 509 * bytes to read the build hash. We will return the remaining bytes up 510 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 511 * of bytes we will pad the value with zeros, as the section should be 512 * four byte aligned. 513 */ 514 if (sectionlen <= BUILD_ID_HEADER_LEN || 515 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 516 return (ENOENT); 517 } 518 519 520 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 521 for (int i = 0; i < hashlen; i++) { 522 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 523 snprintf(&buf[2*i], 3, "%02x", c); 524 } 525 526 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 527 } 528 529 SYSCTL_PROC(_kern, OID_AUTO, build_id, 530 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 531 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 532 533 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features"); 534 535 #ifdef COMPAT_FREEBSD4 536 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 537 #endif 538 539 #ifdef COMPAT_FREEBSD5 540 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 541 #endif 542 543 #ifdef COMPAT_FREEBSD6 544 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 545 #endif 546 547 #ifdef COMPAT_FREEBSD7 548 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 549 #endif 550 551 /* 552 * This is really cheating. These actually live in the libc, something 553 * which I'm not quite sure is a good idea anyway, but in order for 554 * getnext and friends to actually work, we define dummies here. 555 * 556 * XXXRW: These probably should be CTLFLAG_CAPRD. 557 */ 558 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 559 "", 0, "PATH that finds all the standard utilities"); 560 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 561 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 562 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 563 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 564 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 565 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 566 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 567 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 568 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 569 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 570 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 571 SYSCTL_NULL_INT_PTR, 0, ""); 572 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 573 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 574 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 575 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 576 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 577 SYSCTL_NULL_INT_PTR, 0, 578 "The version of POSIX 1003.2 with which the system attempts to comply"); 579 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 580 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 581 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 582 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 583 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 584 SYSCTL_NULL_INT_PTR, 0, ""); 585 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 586 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 587 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 588 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 589 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 590 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 591 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 592 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 593 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 594 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 595 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 596 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 597 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 598 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 599 600 #include <sys/vnode.h> 601 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 602 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 603 604 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 605 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 606 607 static int 608 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 609 { 610 int error, pm; 611 612 pm = pid_max; 613 error = sysctl_handle_int(oidp, &pm, 0, req); 614 if (error || !req->newptr) 615 return (error); 616 sx_xlock(&proctree_lock); 617 sx_xlock(&allproc_lock); 618 619 /* 620 * Only permit the values less then PID_MAX. 621 * As a safety measure, do not allow to limit the pid_max too much. 622 */ 623 if (pm < 300 || pm > PID_MAX) 624 error = EINVAL; 625 else 626 pid_max = pm; 627 sx_xunlock(&allproc_lock); 628 sx_xunlock(&proctree_lock); 629 return (error); 630 } 631 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 632 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 633 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 634 635 #include <sys/bio.h> 636 #include <sys/buf.h> 637 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 638 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 639 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 640 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 641 642 #include <sys/user.h> 643 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 644 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 645 646 /* Used by kernel debuggers. */ 647 const int pcb_size = sizeof(struct pcb); 648 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 649 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 650 651 /* XXX compatibility, remove for 6.0 */ 652 #include <sys/imgact.h> 653 #include <sys/imgact_elf.h> 654 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 655 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 656 "compatibility for kern.fallback_elf_brand"); 657