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