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 38 #include <sys/cdefs.h> 39 #include "opt_posix.h" 40 #include "opt_config.h" 41 42 #include <sys/param.h> 43 #include <sys/boot.h> 44 #include <sys/elf.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/limits.h> 48 #include <sys/lock.h> 49 #include <sys/mutex.h> 50 #include <sys/proc.h> 51 #include <sys/random.h> 52 #include <sys/sbuf.h> 53 #include <sys/smp.h> 54 #include <sys/sx.h> 55 #include <sys/sysent.h> 56 #include <sys/vmmeter.h> 57 #include <sys/sysctl.h> 58 #include <sys/systm.h> 59 #include <sys/unistd.h> 60 61 #include <vm/vm_param.h> 62 63 SYSCTL_ROOT_NODE(0, sysctl, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 64 "Sysctl internal magic"); 65 SYSCTL_ROOT_NODE(CTL_KERN, kern, CTLFLAG_RW | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 0, 66 "High kernel, proc, limits &c"); 67 SYSCTL_ROOT_NODE(CTL_VM, vm, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 68 "Virtual memory"); 69 SYSCTL_ROOT_NODE(CTL_VFS, vfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 70 "File system"); 71 SYSCTL_ROOT_NODE(CTL_NET, net, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 72 "Network, (see socket.h)"); 73 SYSCTL_ROOT_NODE(CTL_DEBUG, debug, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 74 "Debugging"); 75 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 76 "Sizeof various things"); 77 SYSCTL_ROOT_NODE(CTL_HW, hw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 78 "hardware"); 79 SYSCTL_ROOT_NODE(CTL_MACHDEP, machdep, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 80 "machine dependent"); 81 SYSCTL_NODE(_machdep, OID_AUTO, mitigations, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 82 "Machine dependent platform mitigations."); 83 SYSCTL_ROOT_NODE(CTL_USER, user, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 84 "user-level"); 85 SYSCTL_ROOT_NODE(CTL_P1003_1B, p1003_1b, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 86 "p1003_1b, (see p1003_1b.h)"); 87 88 SYSCTL_ROOT_NODE(OID_AUTO, compat, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 89 "Compatibility code"); 90 SYSCTL_ROOT_NODE(OID_AUTO, security, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 91 "Security"); 92 #ifdef REGRESSION 93 SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 94 "Regression test MIB"); 95 #endif 96 97 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD, 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, 104 version, 0, "Kernel version"); 105 106 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD, 107 compiler_version, 0, "Version of compiler used to compile kernel"); 108 109 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD | CTLFLAG_CAPRD, 110 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, 145 kernelname, sizeof kernelname, "Name of kernel file booted"); 146 147 #ifdef COMPAT_FREEBSD12 148 static int 149 sysctl_maxphys(SYSCTL_HANDLER_ARGS) 150 { 151 u_long lvalue; 152 int ivalue; 153 154 lvalue = maxphys; 155 if (sizeof(int) == sizeof(u_long) || req->oldlen >= sizeof(u_long)) 156 return (sysctl_handle_long(oidp, &lvalue, 0, req)); 157 if (lvalue > INT_MAX) 158 return (sysctl_handle_long(oidp, &lvalue, 0, req)); 159 ivalue = lvalue; 160 return (sysctl_handle_int(oidp, &ivalue, 0, req)); 161 } 162 SYSCTL_PROC(_kern, KERN_MAXPHYS, maxphys, CTLTYPE_LONG | CTLFLAG_RDTUN | 163 CTLFLAG_NOFETCH | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 164 NULL, 0, sysctl_maxphys, "UL", "Maximum block I/O access size"); 165 #else 166 SYSCTL_ULONG(_kern, KERN_MAXPHYS, maxphys, 167 CTLFLAG_RDTUN | CTLFLAG_NOFETCH | CTLFLAG_CAPRD, 168 &maxphys, 0, "Maximum block I/O access size"); 169 #endif 170 171 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD, 172 &mp_ncpus, 0, "Number of active CPUs"); 173 174 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD, 175 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order"); 176 177 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD, 178 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size"); 179 180 static int 181 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 182 { 183 char buf[256]; 184 size_t len; 185 186 len = MIN(req->oldlen, sizeof(buf)); 187 read_random(buf, len); 188 return (SYSCTL_OUT(req, buf, len)); 189 } 190 191 SYSCTL_PROC(_kern, KERN_ARND, arandom, 192 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0, 193 sysctl_kern_arnd, "", "arc4rand"); 194 195 static int 196 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 197 { 198 u_long val, p; 199 200 p = SIZE_T_MAX >> PAGE_SHIFT; 201 if (physmem < p) 202 p = physmem; 203 val = ctob(p); 204 return (sysctl_handle_long(oidp, &val, 0, req)); 205 } 206 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, 207 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 208 sysctl_hw_physmem, "LU", 209 "Amount of physical memory (in bytes)"); 210 211 static int 212 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 213 { 214 u_long val, p; 215 216 p = SIZE_T_MAX >> PAGE_SHIFT; 217 if (realmem < p) 218 p = realmem; 219 val = ctob(p); 220 return (sysctl_handle_long(oidp, &val, 0, req)); 221 } 222 SYSCTL_PROC(_hw, HW_REALMEM, realmem, 223 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 224 sysctl_hw_realmem, "LU", 225 "Amount of memory (in bytes) reported by the firmware"); 226 227 static int 228 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 229 { 230 u_long val, p, p1; 231 232 p1 = physmem - vm_wire_count(); 233 p = SIZE_T_MAX >> PAGE_SHIFT; 234 if (p1 < p) 235 p = p1; 236 val = ctob(p); 237 return (sysctl_handle_long(oidp, &val, 0, req)); 238 } 239 SYSCTL_PROC(_hw, HW_USERMEM, usermem, 240 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 241 sysctl_hw_usermem, "LU", 242 "Amount of memory (in bytes) which is not wired"); 243 244 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, 245 "Amount of physical memory (in pages)"); 246 247 #if VM_NRESERVLEVEL > 0 248 _Static_assert(MAXPAGESIZES > VM_NRESERVLEVEL, "MAXPAGESIZES is too small"); 249 #endif 250 251 u_long __read_mostly pagesizes[MAXPAGESIZES] = { PAGE_SIZE }; 252 253 static int 254 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS) 255 { 256 int error; 257 size_t len; 258 #ifdef SCTL_MASK32 259 int i; 260 uint32_t pagesizes32[MAXPAGESIZES]; 261 262 if (req->flags & SCTL_MASK32) { 263 /* 264 * Recreate the "pagesizes" array with 32-bit elements. 265 * Truncate any page size greater than UINT32_MAX to zero, 266 * which assumes that page sizes are powers of two. 267 */ 268 for (i = 0; i < MAXPAGESIZES; i++) 269 pagesizes32[i] = (uint32_t)pagesizes[i]; 270 271 len = sizeof(pagesizes32); 272 if (len > req->oldlen && req->oldptr != NULL) 273 len = req->oldlen; 274 error = SYSCTL_OUT(req, pagesizes32, len); 275 } else 276 #endif 277 { 278 len = sizeof(pagesizes); 279 if (len > req->oldlen && req->oldptr != NULL) 280 len = req->oldlen; 281 error = SYSCTL_OUT(req, pagesizes, len); 282 } 283 return (error); 284 } 285 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, 286 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 287 sysctl_hw_pagesizes, "S,pagesizes", 288 "Supported page sizes"); 289 290 int adaptive_machine_arch = 1; 291 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW, 292 &adaptive_machine_arch, 1, 293 "Adapt reported machine architecture to the ABI of the binary"); 294 295 static const char * 296 proc_machine_arch(struct proc *p) 297 { 298 299 if (p->p_sysent->sv_machine_arch != NULL) 300 return (p->p_sysent->sv_machine_arch(p)); 301 #ifdef COMPAT_FREEBSD32 302 if (SV_PROC_FLAG(p, SV_ILP32)) 303 return (MACHINE_ARCH32); 304 #endif 305 return (MACHINE_ARCH); 306 } 307 308 static int 309 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS) 310 { 311 const char *machine_arch; 312 313 if (adaptive_machine_arch) 314 machine_arch = proc_machine_arch(curproc); 315 else 316 machine_arch = MACHINE_ARCH; 317 return (SYSCTL_OUT(req, machine_arch, strlen(machine_arch) + 1)); 318 } 319 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD | 320 CTLFLAG_CAPRD | CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A", 321 "System architecture"); 322 323 #ifdef COMPAT_FREEBSD32 324 #include <compat/freebsd32/freebsd32_util.h> 325 #endif 326 327 static int 328 sysctl_kern_supported_archs(SYSCTL_HANDLER_ARGS) 329 { 330 const char *supported_archs; 331 332 supported_archs = 333 #ifdef COMPAT_FREEBSD32 334 compat_freebsd_32bit ? MACHINE_ARCH " " MACHINE_ARCH32 : 335 #endif 336 MACHINE_ARCH; 337 return (SYSCTL_OUT(req, supported_archs, strlen(supported_archs) + 1)); 338 } 339 SYSCTL_PROC(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE | 340 CTLFLAG_CAPRD | CTLTYPE_STRING, NULL, 0, sysctl_kern_supported_archs, "A", 341 "Supported architectures for binaries"); 342 343 static int 344 sysctl_hostname(SYSCTL_HANDLER_ARGS) 345 { 346 struct prison *pr, *cpr; 347 size_t pr_offset; 348 char tmpname[MAXHOSTNAMELEN]; 349 int descend, error, len; 350 351 /* 352 * This function can set: hostname domainname hostuuid. 353 * Keep that in mind when comments say "hostname". 354 */ 355 pr_offset = (size_t)arg1; 356 len = arg2; 357 KASSERT(len <= sizeof(tmpname), 358 ("length %d too long for %s", len, __func__)); 359 360 /* 361 * Make a local copy of hostname to get/set so we don't have to hold 362 * the jail mutex during the sysctl copyin/copyout activities. 363 */ 364 pr = req->td->td_ucred->cr_prison; 365 mtx_lock(&pr->pr_mtx); 366 bcopy((char *)pr + pr_offset, tmpname, len); 367 mtx_unlock(&pr->pr_mtx); 368 369 error = sysctl_handle_string(oidp, tmpname, len, req); 370 if (error != 0 || req->newptr == NULL) 371 return (error); 372 373 /* 374 * Copy the locally set hostname to all jails that share 375 * this host info. 376 */ 377 sx_slock(&allprison_lock); 378 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME)) 379 error = EPERM; 380 else { 381 while (!(pr->pr_flags & PR_HOST)) 382 pr = pr->pr_parent; 383 mtx_lock(&pr->pr_mtx); 384 bcopy(tmpname, (char *)pr + pr_offset, len); 385 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 386 if (cpr->pr_flags & PR_HOST) 387 descend = 0; 388 else 389 bcopy(tmpname, (char *)cpr + pr_offset, len); 390 mtx_unlock(&pr->pr_mtx); 391 } 392 sx_sunlock(&allprison_lock); 393 return (error); 394 } 395 396 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 397 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 398 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN, 399 sysctl_hostname, "A", "Hostname"); 400 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, 401 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 402 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN, 403 sysctl_hostname, "A", "Name of the current YP/NIS domain"); 404 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid, 405 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 406 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN, 407 sysctl_hostname, "A", "Host UUID"); 408 409 static int regression_securelevel_nonmonotonic = 0; 410 411 #ifdef REGRESSION 412 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 413 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 414 #endif 415 416 static int 417 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 418 { 419 struct prison *pr, *cpr; 420 int descend, error, level; 421 422 pr = req->td->td_ucred->cr_prison; 423 424 /* 425 * Reading the securelevel is easy, since the current jail's level 426 * is known to be at least as secure as any higher levels. Perform 427 * a lockless read since the securelevel is an integer. 428 */ 429 level = pr->pr_securelevel; 430 error = sysctl_handle_int(oidp, &level, 0, req); 431 if (error || !req->newptr) 432 return (error); 433 /* Permit update only if the new securelevel exceeds the old. */ 434 sx_slock(&allprison_lock); 435 mtx_lock(&pr->pr_mtx); 436 if (!regression_securelevel_nonmonotonic && 437 level < pr->pr_securelevel) { 438 mtx_unlock(&pr->pr_mtx); 439 sx_sunlock(&allprison_lock); 440 return (EPERM); 441 } 442 pr->pr_securelevel = level; 443 /* 444 * Set all child jails to be at least this level, but do not lower 445 * them (even if regression_securelevel_nonmonotonic). 446 */ 447 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 448 if (cpr->pr_securelevel < level) 449 cpr->pr_securelevel = level; 450 } 451 mtx_unlock(&pr->pr_mtx); 452 sx_sunlock(&allprison_lock); 453 return (error); 454 } 455 456 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 457 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 0, 0, 458 sysctl_kern_securelvl, "I", 459 "Current secure level"); 460 461 #ifdef INCLUDE_CONFIG_FILE 462 /* Actual kernel configuration options. */ 463 extern char kernconfstring[]; 464 465 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD, 466 kernconfstring, 0, "Kernel configuration file"); 467 #endif 468 469 static int 470 sysctl_hostid(SYSCTL_HANDLER_ARGS) 471 { 472 struct prison *pr, *cpr; 473 u_long tmpid; 474 int descend, error; 475 476 /* 477 * Like sysctl_hostname, except it operates on a u_long 478 * instead of a string, and is used only for hostid. 479 */ 480 pr = req->td->td_ucred->cr_prison; 481 mtx_lock(&pr->pr_mtx); 482 tmpid = pr->pr_hostid; 483 mtx_unlock(&pr->pr_mtx); 484 485 error = sysctl_handle_long(oidp, &tmpid, 0, req); 486 if (error != 0 || req->newptr == NULL) 487 return (error); 488 489 sx_slock(&allprison_lock); 490 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME)) 491 error = EPERM; 492 else { 493 while (!(pr->pr_flags & PR_HOST)) 494 pr = pr->pr_parent; 495 mtx_lock(&pr->pr_mtx); 496 pr->pr_hostid = tmpid; 497 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) 498 if (cpr->pr_flags & PR_HOST) 499 descend = 0; 500 else 501 cpr->pr_hostid = tmpid; 502 mtx_unlock(&pr->pr_mtx); 503 } 504 sx_sunlock(&allprison_lock); 505 return (error); 506 } 507 508 SYSCTL_PROC(_kern, KERN_HOSTID, hostid, 509 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 510 NULL, 0, sysctl_hostid, "LU", "Host ID"); 511 512 static struct mtx bootid_lk; 513 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF); 514 515 static int 516 sysctl_bootid(SYSCTL_HANDLER_ARGS) 517 { 518 static uint8_t boot_id[16]; 519 static bool initialized = false; 520 521 mtx_lock(&bootid_lk); 522 if (!initialized) { 523 if (!is_random_seeded()) { 524 mtx_unlock(&bootid_lk); 525 return (ENXIO); 526 } 527 arc4random_buf(boot_id, sizeof(boot_id)); 528 initialized = true; 529 } 530 mtx_unlock(&bootid_lk); 531 532 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id))); 533 } 534 SYSCTL_PROC(_kern, OID_AUTO, boot_id, 535 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, 536 NULL, 0, sysctl_bootid, "", "Random boot ID"); 537 538 /* 539 * The osrelease string is copied from the global (osrelease in vers.c) into 540 * prison0 by a sysinit and is inherited by child jails if not changed at jail 541 * creation, so we always return the copy from the current prison data. 542 */ 543 static int 544 sysctl_osrelease(SYSCTL_HANDLER_ARGS) 545 { 546 struct prison *pr; 547 548 pr = req->td->td_ucred->cr_prison; 549 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1)); 550 551 } 552 553 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease, 554 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 555 NULL, 0, sysctl_osrelease, "A", "Operating system release"); 556 557 /* 558 * The osreldate number is copied from the global (osreldate in vers.c) into 559 * prison0 by a sysinit and is inherited by child jails if not changed at jail 560 * creation, so we always return the value from the current prison data. 561 */ 562 static int 563 sysctl_osreldate(SYSCTL_HANDLER_ARGS) 564 { 565 struct prison *pr; 566 567 pr = req->td->td_ucred->cr_prison; 568 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate))); 569 570 } 571 572 /* 573 * NOTICE: The *userland* release date is available in 574 * /usr/include/osreldate.h 575 */ 576 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate, 577 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 578 NULL, 0, sysctl_osreldate, "I", "Kernel release date"); 579 580 /* 581 * The build-id is copied from the ELF section .note.gnu.build-id. The linker 582 * script defines two variables to expose the beginning and end. LLVM 583 * currently uses a SHA-1 hash, but other formats can be supported by checking 584 * the length of the section. 585 */ 586 587 extern char __build_id_start[]; 588 extern char __build_id_end[]; 589 590 #define BUILD_ID_HEADER_LEN 0x10 591 #define BUILD_ID_HASH_MAXLEN 0x14 592 593 static int 594 sysctl_build_id(SYSCTL_HANDLER_ARGS) 595 { 596 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start); 597 int hashlen; 598 char buf[2*BUILD_ID_HASH_MAXLEN+1]; 599 600 /* 601 * The ELF note section has a four byte length for the vendor name, 602 * four byte length for the value, and a four byte vendor specific 603 * type. The name for the build id is "GNU\0". We skip the first 16 604 * bytes to read the build hash. We will return the remaining bytes up 605 * to 20 (SHA-1) hash size. If the hash happens to be a custom number 606 * of bytes we will pad the value with zeros, as the section should be 607 * four byte aligned. 608 */ 609 if (sectionlen <= BUILD_ID_HEADER_LEN || 610 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) { 611 return (ENOENT); 612 } 613 614 hashlen = sectionlen - BUILD_ID_HEADER_LEN; 615 for (int i = 0; i < hashlen; i++) { 616 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN]; 617 snprintf(&buf[2*i], 3, "%02x", c); 618 } 619 620 return (SYSCTL_OUT(req, buf, strlen(buf) + 1)); 621 } 622 623 SYSCTL_PROC(_kern, OID_AUTO, build_id, 624 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE, 625 NULL, 0, sysctl_build_id, "A", "Operating system build-id"); 626 627 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 628 "Kernel Features"); 629 630 #ifdef COMPAT_FREEBSD4 631 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 632 #endif 633 634 #ifdef COMPAT_FREEBSD5 635 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 636 #endif 637 638 #ifdef COMPAT_FREEBSD6 639 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 640 #endif 641 642 #ifdef COMPAT_FREEBSD7 643 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 644 #endif 645 646 #ifdef COMPAT_FREEBSD8 647 FEATURE(compat_freebsd8, "Compatible with FreeBSD 8"); 648 #endif 649 650 #ifdef COMPAT_FREEBSD9 651 FEATURE(compat_freebsd9, "Compatible with FreeBSD 9"); 652 #endif 653 654 #ifdef COMPAT_FREEBSD10 655 FEATURE(compat_freebsd10, "Compatible with FreeBSD 10"); 656 #endif 657 658 #ifdef COMPAT_FREEBSD11 659 FEATURE(compat_freebsd11, "Compatible with FreeBSD 11"); 660 #endif 661 662 #ifdef COMPAT_FREEBSD12 663 FEATURE(compat_freebsd12, "Compatible with FreeBSD 12"); 664 #endif 665 666 #ifdef COMPAT_FREEBSD13 667 FEATURE(compat_freebsd13, "Compatible with FreeBSD 13"); 668 #endif 669 670 #ifdef COMPAT_FREEBSD14 671 FEATURE(compat_freebsd14, "Compatible with FreeBSD 14"); 672 #endif 673 674 /* 675 * This is really cheating. These actually live in the libc, something 676 * which I'm not quite sure is a good idea anyway, but in order for 677 * getnext and friends to actually work, we define dummies here. 678 * 679 * XXXRW: These probably should be CTLFLAG_CAPRD. 680 */ 681 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 682 "", 0, "PATH that finds all the standard utilities"); 683 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 684 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)"); 685 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 686 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)"); 687 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 688 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)"); 689 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 690 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)"); 691 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 692 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 693 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 694 SYSCTL_NULL_INT_PTR, 0, ""); 695 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 696 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line"); 697 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 698 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted"); 699 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 700 SYSCTL_NULL_INT_PTR, 0, 701 "The version of POSIX 1003.2 with which the system attempts to comply"); 702 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 703 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option"); 704 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 705 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option"); 706 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 707 SYSCTL_NULL_INT_PTR, 0, ""); 708 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 709 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities"); 710 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 711 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities"); 712 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 713 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales"); 714 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 715 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities"); 716 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 717 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities"); 718 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 719 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time"); 720 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 721 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names"); 722 723 static char localbase[MAXPATHLEN] = ""; 724 725 SYSCTL_STRING(_user, USER_LOCALBASE, localbase, CTLFLAG_RWTUN, 726 localbase, sizeof(localbase), "Prefix used to install and locate add-on packages"); 727 728 #include <sys/vnode.h> 729 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 730 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)"); 731 732 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 733 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)"); 734 735 static int 736 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) 737 { 738 int error, pm; 739 740 pm = pid_max; 741 error = sysctl_handle_int(oidp, &pm, 0, req); 742 if (error || !req->newptr) 743 return (error); 744 sx_xlock(&proctree_lock); 745 sx_xlock(&allproc_lock); 746 747 /* 748 * Only permit the values less then PID_MAX. 749 * As a safety measure, do not allow to limit the pid_max too much. 750 */ 751 if (pm < 300 || pm > PID_MAX) 752 error = EINVAL; 753 else 754 pid_max = pm; 755 sx_xunlock(&allproc_lock); 756 sx_xunlock(&proctree_lock); 757 return (error); 758 } 759 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | 760 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 761 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid"); 762 763 SYSCTL_INT(_kern, OID_AUTO, pid_max_limit, CTLFLAG_RD, 764 SYSCTL_NULL_INT_PTR, PID_MAX, 765 "Maximum allowed pid (kern.pid_max) top limit"); 766 767 #include <sys/bio.h> 768 #include <sys/buf.h> 769 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 770 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)"); 771 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 772 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)"); 773 774 #include <sys/user.h> 775 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 776 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 777 778 /* Used by kernel debuggers. */ 779 const int pcb_size = sizeof(struct pcb); 780 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD, 781 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)"); 782 783 /* XXX compatibility, remove for 6.0 */ 784 #include <sys/imgact.h> 785 #include <sys/imgact_elf.h> 786 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 787 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 788 "compatibility for kern.fallback_elf_brand"); 789