Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_mib.c
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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_NODE(_machdep, OID_AUTO, mitigations, CTLFLAG_RW, 0, 82 "Machine dependent platform mitigations."); 83 SYSCTL_ROOT_NODE(CTL_USER, user, CTLFLAG_RW, 0, 84 "user-level"); 85 SYSCTL_ROOT_NODE(CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 86 "p1003_1b, (see p1003_1b.h)"); 87 88 SYSCTL_ROOT_NODE(OID_AUTO, compat, CTLFLAG_RW, 0, 89 "Compatibility code"); 90 SYSCTL_ROOT_NODE(OID_AUTO, security, CTLFLAG_RW, 0, 91 "Security"); 92 #ifdef REGRESSION 93 SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW, 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 SYSCTL_INT(_kern, KERN_MAXPHYS, maxphys, CTLFLAG_RD | CTLFLAG_CAPRD, 148 SYSCTL_NULL_INT_PTR, MAXPHYS, "Maximum block I/O access size"); 149 150 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD, 151 &mp_ncpus, 0, "Number of active CPUs"); 152 153 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD, 154 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order"); 155 156 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD, 157 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size"); 158 159 static int 160 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 161 { 162 char buf[256]; 163 size_t len; 164 165 len = MIN(req->oldlen, sizeof(buf)); 166 read_random(buf, len); 167 return (SYSCTL_OUT(req, buf, len)); 168 } 169 170 SYSCTL_PROC(_kern, KERN_ARND, arandom, 171 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0, 172 sysctl_kern_arnd, "", "arc4rand"); 173 174 static int 175 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 176 { 177 u_long val, p; 178 179 p = SIZE_T_MAX >> PAGE_SHIFT; 180 if (physmem < p) 181 p = physmem; 182 val = ctob(p); 183 return (sysctl_handle_long(oidp, &val, 0, req)); 184 } 185 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 186 0, 0, sysctl_hw_physmem, "LU", 187 "Amount of physical memory (in bytes)"); 188 189 static int 190 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 191 { 192 u_long val, p; 193 194 p = SIZE_T_MAX >> PAGE_SHIFT; 195 if (realmem < p) 196 p = realmem; 197 val = ctob(p); 198 return (sysctl_handle_long(oidp, &val, 0, req)); 199 } 200 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD, 201 0, 0, sysctl_hw_realmem, "LU", 202 "Amount of memory (in bytes) reported by the firmware"); 203 204 static int 205 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 206 { 207 u_long val, p, p1; 208 209 p1 = physmem - vm_wire_count(); 210 p = SIZE_T_MAX >> PAGE_SHIFT; 211 if (p1 < p) 212 p = p1; 213 val = ctob(p); 214 return (sysctl_handle_long(oidp, &val, 0, req)); 215 } 216 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 217 0, 0, sysctl_hw_usermem, "LU", 218 "Amount of memory (in bytes) which is not wired"); 219 220 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, 221 "Amount of physical memory (in pages)"); 222 223 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE }; 224 225 static int 226 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS) 227 { 228 int error; 229 size_t len; 230 #ifdef SCTL_MASK32 231 int i; 232 uint32_t pagesizes32[MAXPAGESIZES]; 233 234 if (req->flags & SCTL_MASK32) { 235 /* 236 * Recreate the "pagesizes" array with 32-bit elements. 237 * Truncate any page size greater than UINT32_MAX to zero, 238 * which assumes that page sizes are powers of two. 239 */ 240 for (i = 0; i < MAXPAGESIZES; i++) 241 pagesizes32[i] = (uint32_t)pagesizes[i]; 242 243 len = sizeof(pagesizes32); 244 if (len > req->oldlen) 245 len = req->oldlen; 246 error = SYSCTL_OUT(req, pagesizes32, len); 247 } else 248 #endif 249 { 250 len = sizeof(pagesizes); 251 if (len > req->oldlen) 252 len = req->oldlen; 253 error = SYSCTL_OUT(req, pagesizes, len); 254 } 255 return (error); 256 } 257 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, CTLTYPE_ULONG | CTLFLAG_RD, 258 NULL, 0, sysctl_hw_pagesizes, "LU", "Supported page sizes"); 259 260 #ifdef SCTL_MASK32 261 int adaptive_machine_arch = 1; 262 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 263 &adaptive_machine_arch, 1, 264 "Adapt reported machine architecture to the ABI of the binary"); 265 #endif 266 267 static int 268 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 269 { 270 int error; 271 static const char machine_arch[] = MACHINE_ARCH; 272 #ifdef SCTL_MASK32 273 static const char machine_arch32[] = MACHINE_ARCH32; 274 275 if ((req->flags & SCTL_MASK32) != 0 && adaptive_machine_arch) 276 error = SYSCTL_OUT(req, machine_arch32, sizeof(machine_arch32)); 277 else 278 #endif 279 error = SYSCTL_OUT(req, machine_arch, sizeof(machine_arch)); 280 return (error); 281 282 } 283 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 284 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 285 "System architecture"); 286 287 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE, 288 #ifdef COMPAT_FREEBSD32 289 MACHINE_ARCH " " MACHINE_ARCH32, 0, "Supported architectures for binaries"); 290 #else 291 MACHINE_ARCH, 0, "Supported architectures for binaries"); 292 #endif 293 294 static int 295 sysctl_hostname(SYSCTL_HANDLER_ARGS) 296 { 297 struct prison *pr, *cpr; 298 size_t pr_offset; 299 char tmpname[MAXHOSTNAMELEN]; 300 int descend, error, len; 301 302 /* 303 * This function can set: hostname domainname hostuuid. 304 * Keep that in mind when comments say "hostname". 305 */ 306 pr_offset = (size_t)arg1; 307 len = arg2; 308 KASSERT(len <= sizeof(tmpname), 309 ("length %d too long for %s", len, __func__)); 310 311 pr = req->td->td_ucred->cr_prison; 312 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 313 return (EPERM); 314 /* 315 * Make a local copy of hostname to get/set so we don't have to hold 316 * the jail mutex during the sysctl copyin/copyout activities. 317 */ 318 mtx_lock(&pr->pr_mtx); 319 bcopy((char *)pr + pr_offset, tmpname, len); 320 mtx_unlock(&pr->pr_mtx); 321 322 error = sysctl_handle_string(oidp, tmpname, len, req); 323 324 if (req->newptr != NULL && error == 0) { 325 /* 326 * Copy the locally set hostname to all jails that share 327 * this host info. 328 */ 329 sx_slock(&allprison_lock); 330 while (!(pr->pr_flags & PR_HOST)) 331 pr = pr->pr_parent; 332 mtx_lock(&pr->pr_mtx); 333 bcopy(tmpname, (char *)pr + pr_offset, len); 334 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 335 if (cpr->pr_flags & PR_HOST) 336 descend = 0; 337 else 338 bcopy(tmpname, (char *)cpr + pr_offset, len); 339 mtx_unlock(&pr->pr_mtx); 340 sx_sunlock(&allprison_lock); 341 } 342 return (error); 343 } 344 345 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 346 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 347 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN, 348 sysctl_hostname, "A", "Hostname"); 349 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, 350 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 351 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN, 352 sysctl_hostname, "A", "Name of the current YP/NIS domain"); 353 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid, 354 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 355 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN, 356 sysctl_hostname, "A", "Host UUID"); 357 358 static int regression_securelevel_nonmonotonic = 0; 359 360 #ifdef REGRESSION 361 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 362 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 363 #endif 364 365 static int 366 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 367 { 368 struct prison *pr, *cpr; 369 int descend, error, level; 370 371 pr = req->td->td_ucred->cr_prison; 372 373 /* 374 * Reading the securelevel is easy, since the current jail's level 375 * is known to be at least as secure as any higher levels. Perform 376 * a lockless read since the securelevel is an integer. 377 */ 378 level = pr->pr_securelevel; 379 error = sysctl_handle_int(oidp, &level, 0, req); 380 if (error || !req->newptr) 381 return (error); 382 /* Permit update only if the new securelevel exceeds the old. */ 383 sx_slock(&allprison_lock); 384 mtx_lock(&pr->pr_mtx); 385 if (!regression_securelevel_nonmonotonic && 386 level < pr->pr_securelevel) { 387 mtx_unlock(&pr->pr_mtx); 388 sx_sunlock(&allprison_lock); 389 return (EPERM); 390 } 391 pr->pr_securelevel = level; 392 /* 393 * Set all child jails to be at least this level, but do not lower 394 * them (even if regression_securelevel_nonmonotonic). 395 */ 396 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 397 if (cpr->pr_securelevel < level) 398 cpr->pr_securelevel = level; 399 } 400 mtx_unlock(&pr->pr_mtx); 401 sx_sunlock(&allprison_lock); 402 return (error); 403 } 404 405 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 406 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 407 "I", "Current secure level"); 408 409 #ifdef INCLUDE_CONFIG_FILE 410 /* Actual kernel configuration options. */ 411 extern char kernconfstring[]; 412 413 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE, 414 kernconfstring, 0, "Kernel configuration file"); 415 #endif 416 417 static int 418 sysctl_hostid(SYSCTL_HANDLER_ARGS) 419 { 420 struct prison *pr, *cpr; 421 u_long tmpid; 422 int descend, error; 423 424 /* 425 * Like sysctl_hostname, except it operates on a u_long 426 * instead of a string, and is used only for hostid. 427 */ 428 pr = req->td->td_ucred->cr_prison; 429 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 430 return (EPERM); 431 tmpid = pr->pr_hostid; 432 error = sysctl_handle_long(oidp, &tmpid, 0, req); 433 434 if (req->newptr != NULL && error == 0) { 435 sx_slock(&allprison_lock); 436 while (!(pr->pr_flags & PR_HOST)) 437 pr = pr->pr_parent; 438 mtx_lock(&pr->pr_mtx); 439 pr->pr_hostid = tmpid; 440 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 441 if (cpr->pr_flags & PR_HOST) 442 descend = 0; 443 else 444 cpr->pr_hostid = tmpid; 445 mtx_unlock(&pr->pr_mtx); 446 sx_sunlock(&allprison_lock); 447 } 448 return (error); 449 } 450 451 SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 452 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 453 NULL, 0, sysctl_hostid, "LU", "Host ID"); 454 455 /* 456 * The osrelease string is copied from the global (osrelease in vers.c) into 457 * prison0 by a sysinit and is inherited by child jails if not changed at jail 458 * creation, so we always return the copy from the current prison data. 459 */ 460 static int 461 sysctl_osrelease(SYSCTL_HANDLER_ARGS) 462 { 463 struct prison *pr; 464 465 pr = req->td->td_ucred->cr_prison; 466 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 467 468 } 469 470 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 471 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 472 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 473 474 /* 475 * The osreldate number is copied from the global (osreldate in vers.c) into 476 * prison0 by a sysinit and is inherited by child jails if not changed at jail 477 * creation, so we always return the value from the current prison data. 478 */ 479 static int 480 sysctl_osreldate(SYSCTL_HANDLER_ARGS) 481 { 482 struct prison *pr; 483 484 pr = req->td->td_ucred->cr_prison; 485 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 486 487 } 488 489 /* 490 * NOTICE: The *userland* release date is available in 491 * /usr/include/osreldate.h 492 */ 493 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 494 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 495 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 496 497 /* 498 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 499 * script defines two variables to expose the beginning and end. LLVM 500 * currently uses a SHA-1 hash, but other formats can be supported by checking 501 * the length of the section. 502 */ 503 504 extern char __build_id_start[]; 505 extern char __build_id_end[]; 506 507 #define BUILD_ID_HEADER_LEN 0x10 508 #define BUILD_ID_HASH_MAXLEN 0x14 509 510 static int 511 sysctl_build_id(SYSCTL_HANDLER_ARGS) 512 { 513 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 514 int hashlen; 515 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 516 517 /* 518 * The ELF note section has a four byte length for the vendor name, 519 * four byte length for the value, and a four byte vendor specific 520 * type. The name for the build id is "GNU\0". We skip the first 16 521 * bytes to read the build hash. We will return the remaining bytes up 522 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 523 * of bytes we will pad the value with zeros, as the section should be 524 * four byte aligned. 525 */ 526 if (sectionlen <= BUILD_ID_HEADER_LEN || 527 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 528 return (ENOENT); 529 } 530 531 532 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 533 for (int i = 0; i < hashlen; i++) { 534 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 535 snprintf(&buf[2*i], 3, "%02x", c); 536 } 537 538 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 539 } 540 541 SYSCTL_PROC(_kern, OID_AUTO, build_id, 542 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 543 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 544 545 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features"); 546 547 #ifdef COMPAT_FREEBSD4 548 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 549 #endif 550 551 #ifdef COMPAT_FREEBSD5 552 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 553 #endif 554 555 #ifdef COMPAT_FREEBSD6 556 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 557 #endif 558 559 #ifdef COMPAT_FREEBSD7 560 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 561 #endif 562 563 /* 564 * This is really cheating. These actually live in the libc, something 565 * which I'm not quite sure is a good idea anyway, but in order for 566 * getnext and friends to actually work, we define dummies here. 567 * 568 * XXXRW: These probably should be CTLFLAG_CAPRD. 569 */ 570 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 571 "", 0, "PATH that finds all the standard utilities"); 572 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 573 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 574 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 575 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 576 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 577 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 578 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 579 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 580 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 581 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 582 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 583 SYSCTL_NULL_INT_PTR, 0, ""); 584 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 585 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 586 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 587 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 588 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 589 SYSCTL_NULL_INT_PTR, 0, 590 "The version of POSIX 1003.2 with which the system attempts to comply"); 591 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 592 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 593 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 594 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 595 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 596 SYSCTL_NULL_INT_PTR, 0, ""); 597 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 598 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 599 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 600 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 601 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 602 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 603 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 604 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 605 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 606 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 607 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 608 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 609 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 610 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 611 612 #include <sys/vnode.h> 613 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 614 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 615 616 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 617 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 618 619 static int 620 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 621 { 622 int error, pm; 623 624 pm = pid_max; 625 error = sysctl_handle_int(oidp, &pm, 0, req); 626 if (error || !req->newptr) 627 return (error); 628 sx_xlock(&proctree_lock); 629 sx_xlock(&allproc_lock); 630 631 /* 632 * Only permit the values less then PID_MAX. 633 * As a safety measure, do not allow to limit the pid_max too much. 634 */ 635 if (pm < 300 || pm > PID_MAX) 636 error = EINVAL; 637 else 638 pid_max = pm; 639 sx_xunlock(&allproc_lock); 640 sx_xunlock(&proctree_lock); 641 return (error); 642 } 643 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 644 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 645 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 646 647 #include <sys/bio.h> 648 #include <sys/buf.h> 649 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 650 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 651 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 652 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 653 654 #include <sys/user.h> 655 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 656 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 657 658 /* Used by kernel debuggers. */ 659 const int pcb_size = sizeof(struct pcb); 660 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 661 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 662 663 /* XXX compatibility, remove for 6.0 */ 664 #include <sys/imgact.h> 665 #include <sys/imgact_elf.h> 666 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 667 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 668 "compatibility for kern.fallback_elf_brand");
Cache object: e7343fb8048371f3e59071d5a79309e9
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