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 63SYSCTL_ROOT_NODE(0, sysctl, CTLFLAG_RW, 0, 64 "Sysctl internal magic"); 65SYSCTL_ROOT_NODE(CTL_KERN, kern, CTLFLAG_RW|CTLFLAG_CAPRD, 0, 66 "High kernel, proc, limits &c"); 67SYSCTL_ROOT_NODE(CTL_VM, vm, CTLFLAG_RW, 0, 68 "Virtual memory"); 69SYSCTL_ROOT_NODE(CTL_VFS, vfs, CTLFLAG_RW, 0, 70 "File system"); 71SYSCTL_ROOT_NODE(CTL_NET, net, CTLFLAG_RW, 0, 72 "Network, (see socket.h)"); 73SYSCTL_ROOT_NODE(CTL_DEBUG, debug, CTLFLAG_RW, 0, 74 "Debugging"); 75SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 76 "Sizeof various things"); 77SYSCTL_ROOT_NODE(CTL_HW, hw, CTLFLAG_RW, 0, 78 "hardware"); 79SYSCTL_ROOT_NODE(CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 80 "machine dependent"); 81SYSCTL_NODE(_machdep, OID_AUTO, mitigations, CTLFLAG_RW, 0, 82 "Machine dependent platform mitigations."); 83SYSCTL_ROOT_NODE(CTL_USER, user, CTLFLAG_RW, 0, 84 "user-level"); 85SYSCTL_ROOT_NODE(CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 86 "p1003_1b, (see p1003_1b.h)"); 87 88SYSCTL_ROOT_NODE(OID_AUTO, compat, CTLFLAG_RW, 0, 89 "Compatibility code"); 90SYSCTL_ROOT_NODE(OID_AUTO, security, CTLFLAG_RW, 0, 91 "Security"); 92#ifdef REGRESSION 93SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW, 0, 94 "Regression test MIB"); 95#endif 96 97SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE, 98 kern_ident, 0, "Kernel identifier"); 99 100SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD|CTLFLAG_CAPRD, 101 SYSCTL_NULL_INT_PTR, BSD, "Operating system revision"); 102 103SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE, 104 version, 0, "Kernel version"); 105 106SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD|CTLFLAG_MPSAFE, 107 compiler_version, 0, "Version of compiler used to compile kernel"); 108 109SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE| 110 CTLFLAG_CAPRD, ostype, 0, "Operating system type"); 111 112SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, 113 &maxproc, 0, "Maximum number of processes"); 114 115SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 116 &maxprocperuid, 0, "Maximum processes allowed per userid"); 117 118SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, 119 &maxusers, 0, "Hint for kernel tuning"); 120 121SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD|CTLFLAG_CAPRD, 122 SYSCTL_NULL_INT_PTR, ARG_MAX, "Maximum bytes of argument to execve(2)"); 123 124SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD|CTLFLAG_CAPRD, 125 SYSCTL_NULL_INT_PTR, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 126 127SYSCTL_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 131SYSCTL_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 135SYSCTL_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 138SYSCTL_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 142char kernelname[MAXPATHLEN] = PATH_KERNEL; /* XXX bloat */ 143 144SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW | CTLFLAG_MPSAFE, 145 kernelname, sizeof kernelname, "Name of kernel file booted"); 146 147SYSCTL_INT(_kern, KERN_MAXPHYS, maxphys, CTLFLAG_RD | CTLFLAG_CAPRD, 148 SYSCTL_NULL_INT_PTR, MAXPHYS, "Maximum block I/O access size"); 149 150SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD, 151 &mp_ncpus, 0, "Number of active CPUs"); 152 153SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD, 154 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order"); 155 156SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD, 157 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size"); 158 159static int 160sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 161{ 162 char buf[256]; 163 size_t len; 164 165 /*- 166 * This is one of the very few legitimate uses of read_random(9). 167 * Use of arc4random(9) is not recommended as that will ignore 168 * an unsafe (i.e. unseeded) random(4). 169 * 170 * If random(4) is not seeded, then this returns 0, so the 171 * sysctl will return a zero-length buffer. 172 */ 173 len = read_random(buf, MIN(req->oldlen, sizeof(buf))); 174 return (SYSCTL_OUT(req, buf, len)); 175} 176 177SYSCTL_PROC(_kern, KERN_ARND, arandom, 178 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0, 179 sysctl_kern_arnd, "", "arc4rand"); 180 181static int 182sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 183{ 184 u_long val, p; 185 186 p = SIZE_T_MAX >> PAGE_SHIFT; 187 if (physmem < p) 188 p = physmem; 189 val = ctob(p); 190 return (sysctl_handle_long(oidp, &val, 0, req)); 191} 192SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 193 0, 0, sysctl_hw_physmem, "LU", 194 "Amount of physical memory (in bytes)"); 195 196static int 197sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 198{ 199 u_long val, p; 200 201 p = SIZE_T_MAX >> PAGE_SHIFT; 202 if (realmem < p) 203 p = realmem; 204 val = ctob(p); 205 return (sysctl_handle_long(oidp, &val, 0, req)); 206} 207SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD, 208 0, 0, sysctl_hw_realmem, "LU", 209 "Amount of memory (in bytes) reported by the firmware"); 210 211static int 212sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 213{ 214 u_long val, p, p1; 215 216 p1 = physmem - vm_wire_count(); 217 p = SIZE_T_MAX >> PAGE_SHIFT; 218 if (p1 < p) 219 p = p1; 220 val = ctob(p); 221 return (sysctl_handle_long(oidp, &val, 0, req)); 222} 223SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 224 0, 0, sysctl_hw_usermem, "LU", 225 "Amount of memory (in bytes) which is not wired"); 226 227SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, 228 "Amount of physical memory (in pages)"); 229 230u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE }; 231 232static int 233sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS) 234{ 235 int error; 236 size_t len; 237#ifdef SCTL_MASK32 238 int i; 239 uint32_t pagesizes32[MAXPAGESIZES]; 240 241 if (req->flags & SCTL_MASK32) { 242 /* 243 * Recreate the "pagesizes" array with 32-bit elements. 244 * Truncate any page size greater than UINT32_MAX to zero, 245 * which assumes that page sizes are powers of two. 246 */ 247 for (i = 0; i < MAXPAGESIZES; i++) 248 pagesizes32[i] = (uint32_t)pagesizes[i]; 249 250 len = sizeof(pagesizes32); 251 if (len > req->oldlen) 252 len = req->oldlen; 253 error = SYSCTL_OUT(req, pagesizes32, len); 254 } else 255#endif 256 { 257 len = sizeof(pagesizes); 258 if (len > req->oldlen) 259 len = req->oldlen; 260 error = SYSCTL_OUT(req, pagesizes, len); 261 } 262 return (error); 263} 264SYSCTL_PROC(_hw, OID_AUTO, pagesizes, CTLTYPE_ULONG | CTLFLAG_RD, 265 NULL, 0, sysctl_hw_pagesizes, "LU", "Supported page sizes"); 266 267#ifdef SCTL_MASK32 268int adaptive_machine_arch = 1; 269SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 270 &adaptive_machine_arch, 1, 271 "Adapt reported machine architecture to the ABI of the binary"); 272#endif 273 274static int 275sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 276{ 277 int error; 278 static const char machine_arch[] = MACHINE_ARCH; 279#ifdef SCTL_MASK32 280 static const char machine_arch32[] = MACHINE_ARCH32; 281 282 if ((req->flags & SCTL_MASK32) != 0 && adaptive_machine_arch) 283 error = SYSCTL_OUT(req, machine_arch32, sizeof(machine_arch32)); 284 else 285#endif 286 error = SYSCTL_OUT(req, machine_arch, sizeof(machine_arch)); 287 return (error); 288 289} 290SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 291 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 292 "System architecture"); 293 294SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE, 295#ifdef COMPAT_FREEBSD32 296 MACHINE_ARCH " " MACHINE_ARCH32, 0, "Supported architectures for binaries"); 297#else 298 MACHINE_ARCH, 0, "Supported architectures for binaries"); 299#endif 300 301static int 302sysctl_hostname(SYSCTL_HANDLER_ARGS) 303{ 304 struct prison *pr, *cpr; 305 size_t pr_offset; 306 char tmpname[MAXHOSTNAMELEN]; 307 int descend, error, len; 308 309 /* 310 * This function can set: hostname domainname hostuuid. 311 * Keep that in mind when comments say "hostname". 312 */ 313 pr_offset = (size_t)arg1; 314 len = arg2; 315 KASSERT(len <= sizeof(tmpname), 316 ("length %d too long for %s", len, __func__)); 317 318 pr = req->td->td_ucred->cr_prison; 319 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 320 return (EPERM); 321 /* 322 * Make a local copy of hostname to get/set so we don't have to hold 323 * the jail mutex during the sysctl copyin/copyout activities. 324 */ 325 mtx_lock(&pr->pr_mtx); 326 bcopy((char *)pr + pr_offset, tmpname, len); 327 mtx_unlock(&pr->pr_mtx); 328 329 error = sysctl_handle_string(oidp, tmpname, len, req); 330 331 if (req->newptr != NULL && error == 0) { 332 /* 333 * Copy the locally set hostname to all jails that share 334 * this host info. 335 */ 336 sx_slock(&allprison_lock); 337 while (!(pr->pr_flags & PR_HOST)) 338 pr = pr->pr_parent; 339 mtx_lock(&pr->pr_mtx); 340 bcopy(tmpname, (char *)pr + pr_offset, len); 341 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 342 if (cpr->pr_flags & PR_HOST) 343 descend = 0; 344 else 345 bcopy(tmpname, (char *)cpr + pr_offset, len); 346 mtx_unlock(&pr->pr_mtx); 347 sx_sunlock(&allprison_lock); 348 } 349 return (error); 350} 351 352SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 353 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 354 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN, 355 sysctl_hostname, "A", "Hostname"); 356SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, 357 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 358 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN, 359 sysctl_hostname, "A", "Name of the current YP/NIS domain"); 360SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid, 361 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 362 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN, 363 sysctl_hostname, "A", "Host UUID"); 364 365static int regression_securelevel_nonmonotonic = 0; 366 367#ifdef REGRESSION 368SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 369 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 370#endif 371 372static int 373sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 374{ 375 struct prison *pr, *cpr; 376 int descend, error, level; 377 378 pr = req->td->td_ucred->cr_prison; 379 380 /* 381 * Reading the securelevel is easy, since the current jail's level 382 * is known to be at least as secure as any higher levels. Perform 383 * a lockless read since the securelevel is an integer. 384 */ 385 level = pr->pr_securelevel; 386 error = sysctl_handle_int(oidp, &level, 0, req); 387 if (error || !req->newptr) 388 return (error); 389 /* Permit update only if the new securelevel exceeds the old. */ 390 sx_slock(&allprison_lock); 391 mtx_lock(&pr->pr_mtx); 392 if (!regression_securelevel_nonmonotonic && 393 level < pr->pr_securelevel) { 394 mtx_unlock(&pr->pr_mtx); 395 sx_sunlock(&allprison_lock); 396 return (EPERM); 397 } 398 pr->pr_securelevel = level; 399 /* 400 * Set all child jails to be at least this level, but do not lower 401 * them (even if regression_securelevel_nonmonotonic). 402 */ 403 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 404 if (cpr->pr_securelevel < level) 405 cpr->pr_securelevel = level; 406 } 407 mtx_unlock(&pr->pr_mtx); 408 sx_sunlock(&allprison_lock); 409 return (error); 410} 411 412SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 413 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 414 "I", "Current secure level"); 415 416#ifdef INCLUDE_CONFIG_FILE 417/* Actual kernel configuration options. */ 418extern char kernconfstring[]; 419 420SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE, 421 kernconfstring, 0, "Kernel configuration file"); 422#endif 423 424static int 425sysctl_hostid(SYSCTL_HANDLER_ARGS) 426{ 427 struct prison *pr, *cpr; 428 u_long tmpid; 429 int descend, error; 430 431 /* 432 * Like sysctl_hostname, except it operates on a u_long 433 * instead of a string, and is used only for hostid. 434 */ 435 pr = req->td->td_ucred->cr_prison; 436 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 437 return (EPERM); 438 tmpid = pr->pr_hostid; 439 error = sysctl_handle_long(oidp, &tmpid, 0, req); 440 441 if (req->newptr != NULL && error == 0) { 442 sx_slock(&allprison_lock); 443 while (!(pr->pr_flags & PR_HOST)) 444 pr = pr->pr_parent; 445 mtx_lock(&pr->pr_mtx); 446 pr->pr_hostid = tmpid; 447 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 448 if (cpr->pr_flags & PR_HOST) 449 descend = 0; 450 else 451 cpr->pr_hostid = tmpid; 452 mtx_unlock(&pr->pr_mtx); 453 sx_sunlock(&allprison_lock); 454 } 455 return (error); 456} 457 458SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 459 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 460 NULL, 0, sysctl_hostid, "LU", "Host ID"); 461 462/* 463 * The osrelease string is copied from the global (osrelease 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 copy from the current prison data. 466 */ 467static int 468sysctl_osrelease(SYSCTL_HANDLER_ARGS) 469{ 470 struct prison *pr; 471 472 pr = req->td->td_ucred->cr_prison; 473 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 474 475} 476 477SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 478 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 479 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 480 481/* 482 * The osreldate number is copied from the global (osreldate in vers.c) into 483 * prison0 by a sysinit and is inherited by child jails if not changed at jail 484 * creation, so we always return the value from the current prison data. 485 */ 486static int 487sysctl_osreldate(SYSCTL_HANDLER_ARGS) 488{ 489 struct prison *pr; 490 491 pr = req->td->td_ucred->cr_prison; 492 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 493 494} 495 496/* 497 * NOTICE: The *userland* release date is available in 498 * /usr/include/osreldate.h 499 */ 500SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 501 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 502 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 503 504/* 505 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 506 * script defines two variables to expose the beginning and end. LLVM 507 * currently uses a SHA-1 hash, but other formats can be supported by checking 508 * the length of the section. 509 */ 510 511extern char __build_id_start[]; 512extern char __build_id_end[]; 513 514#define BUILD_ID_HEADER_LEN 0x10 515#define BUILD_ID_HASH_MAXLEN 0x14 516 517static int 518sysctl_build_id(SYSCTL_HANDLER_ARGS) 519{ 520 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 521 int hashlen; 522 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 523 524 /* 525 * The ELF note section has a four byte length for the vendor name, 526 * four byte length for the value, and a four byte vendor specific 527 * type. The name for the build id is "GNU\0". We skip the first 16 528 * bytes to read the build hash. We will return the remaining bytes up 529 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 530 * of bytes we will pad the value with zeros, as the section should be 531 * four byte aligned. 532 */ 533 if (sectionlen <= BUILD_ID_HEADER_LEN || 534 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 535 return (ENOENT); 536 } 537 538 539 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 540 for (int i = 0; i < hashlen; i++) { 541 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 542 snprintf(&buf[2*i], 3, "%02x", c); 543 } 544 545 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 546} 547 548SYSCTL_PROC(_kern, OID_AUTO, build_id, 549 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 550 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 551 552SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features"); 553 554#ifdef COMPAT_FREEBSD4 555FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 556#endif 557 558#ifdef COMPAT_FREEBSD5 559FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 560#endif 561 562#ifdef COMPAT_FREEBSD6 563FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 564#endif 565 566#ifdef COMPAT_FREEBSD7 567FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 568#endif 569 570/* 571 * This is really cheating. These actually live in the libc, something 572 * which I'm not quite sure is a good idea anyway, but in order for 573 * getnext and friends to actually work, we define dummies here. 574 * 575 * XXXRW: These probably should be CTLFLAG_CAPRD. 576 */ 577SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 578 "", 0, "PATH that finds all the standard utilities"); 579SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 580 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 581SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 582 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 583SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 584 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 585SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 586 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 587SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 588 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 589SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 590 SYSCTL_NULL_INT_PTR, 0, ""); 591SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 592 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 593SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 594 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 595SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 596 SYSCTL_NULL_INT_PTR, 0, 597 "The version of POSIX 1003.2 with which the system attempts to comply"); 598SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 599 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 600SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 601 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 602SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 603 SYSCTL_NULL_INT_PTR, 0, ""); 604SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 605 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 606SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 607 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 608SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 609 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 610SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 611 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 612SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 613 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 614SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 615 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 616SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 617 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 618 619#include <sys/vnode.h> 620SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 621 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 622 623SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 624 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 625 626static int 627sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 628{ 629 int error, pm; 630 631 pm = pid_max; 632 error = sysctl_handle_int(oidp, &pm, 0, req); 633 if (error || !req->newptr) 634 return (error); 635 sx_xlock(&proctree_lock); 636 sx_xlock(&allproc_lock); 637 638 /* 639 * Only permit the values less then PID_MAX. 640 * As a safety measure, do not allow to limit the pid_max too much. 641 */ 642 if (pm < 300 || pm > PID_MAX) 643 error = EINVAL; 644 else 645 pid_max = pm; 646 sx_xunlock(&allproc_lock); 647 sx_xunlock(&proctree_lock); 648 return (error); 649} 650SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 651 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 652 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 653 654#include <sys/bio.h> 655#include <sys/buf.h> 656SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 657 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 658SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 659 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 660 661#include <sys/user.h> 662SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 663 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 664 665/* Used by kernel debuggers. */ 666const int pcb_size = sizeof(struct pcb); 667SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 668 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 669 670/* XXX compatibility, remove for 6.0 */ 671#include <sys/imgact.h> 672#include <sys/imgact_elf.h> 673SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 674 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 675 "compatibility for kern.fallback_elf_brand"); 676