1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995 Terrence R. Lambert 5 * All rights reserved. 6 * 7 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 8 * The Regents of the University of California. All rights reserved. 9 * (c) UNIX System Laboratories, Inc. 10 * All or some portions of this file are derived from material licensed 11 * to the University of California by American Telephone and Telegraph 12 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 13 * the permission of UNIX System Laboratories, Inc. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the University of 26 * California, Berkeley and its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 44 */ 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include "opt_ddb.h" 50 #include "opt_init_path.h" 51 #include "opt_verbose_sysinit.h" 52 53 #include <sys/param.h> 54 #include <sys/kernel.h> 55 #include <sys/epoch.h> 56 #include <sys/eventhandler.h> 57 #include <sys/exec.h> 58 #include <sys/file.h> 59 #include <sys/filedesc.h> 60 #include <sys/imgact.h> 61 #include <sys/jail.h> 62 #include <sys/ktr.h> 63 #include <sys/lock.h> 64 #include <sys/loginclass.h> 65 #include <sys/mount.h> 66 #include <sys/mutex.h> 67 #include <sys/syscallsubr.h> 68 #include <sys/sysctl.h> 69 #include <sys/proc.h> 70 #include <sys/racct.h> 71 #include <sys/resourcevar.h> 72 #include <sys/systm.h> 73 #include <sys/signalvar.h> 74 #include <sys/vnode.h> 75 #include <sys/sysent.h> 76 #include <sys/reboot.h> 77 #include <sys/sched.h> 78 #include <sys/sx.h> 79 #include <sys/sysproto.h> 80 #include <sys/vmmeter.h> 81 #include <sys/unistd.h> 82 #include <sys/malloc.h> 83 #include <sys/conf.h> 84 #include <sys/cpuset.h> 85 86 #include <machine/cpu.h> 87 88 #include <security/audit/audit.h> 89 #include <security/mac/mac_framework.h> 90 91 #include <vm/vm.h> 92 #include <vm/vm_param.h> 93 #include <vm/vm_extern.h> 94 #include <vm/pmap.h> 95 #include <vm/vm_map.h> 96 #include <sys/copyright.h> 97 98 #include <ddb/ddb.h> 99 #include <ddb/db_sym.h> 100 101 void mi_startup(void); /* Should be elsewhere */ 102 103 /* Components of the first process -- never freed. */ 104 static struct session session0; 105 static struct pgrp pgrp0; 106 struct proc proc0; 107 struct thread0_storage thread0_st __aligned(32); 108 struct vmspace vmspace0; 109 struct proc *initproc; 110 111 int 112 linux_alloc_current_noop(struct thread *td __unused, int flags __unused) 113 { 114 return (0); 115 } 116 int (*lkpi_alloc_current)(struct thread *, int) = linux_alloc_current_noop; 117 118 #ifndef BOOTHOWTO 119 #define BOOTHOWTO 0 120 #endif 121 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */ 122 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 123 "Boot control flags, passed from loader"); 124 125 #ifndef BOOTVERBOSE 126 #define BOOTVERBOSE 0 127 #endif 128 int bootverbose = BOOTVERBOSE; 129 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 130 "Control the output of verbose kernel messages"); 131 132 #ifdef VERBOSE_SYSINIT 133 /* 134 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to 135 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this 136 * option and associated tunable are: 137 * - 0, 'compiled in but silent by default' 138 * - 1, 'compiled in but verbose by default' (default) 139 */ 140 int verbose_sysinit = VERBOSE_SYSINIT; 141 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit); 142 #endif 143 144 #ifdef INVARIANTS 145 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance"); 146 #endif 147 148 /* 149 * This ensures that there is at least one entry so that the sysinit_set 150 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 151 * executed. 152 */ 153 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 154 155 /* 156 * The sysinit table itself. Items are checked off as the are run. 157 * If we want to register new sysinit types, add them to newsysinit. 158 */ 159 SET_DECLARE(sysinit_set, struct sysinit); 160 struct sysinit **sysinit, **sysinit_end; 161 struct sysinit **newsysinit, **newsysinit_end; 162 163 /* 164 * Merge a new sysinit set into the current set, reallocating it if 165 * necessary. This can only be called after malloc is running. 166 */ 167 void 168 sysinit_add(struct sysinit **set, struct sysinit **set_end) 169 { 170 struct sysinit **newset; 171 struct sysinit **sipp; 172 struct sysinit **xipp; 173 int count; 174 175 count = set_end - set; 176 if (newsysinit) 177 count += newsysinit_end - newsysinit; 178 else 179 count += sysinit_end - sysinit; 180 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 181 if (newset == NULL) 182 panic("cannot malloc for sysinit"); 183 xipp = newset; 184 if (newsysinit) 185 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 186 *xipp++ = *sipp; 187 else 188 for (sipp = sysinit; sipp < sysinit_end; sipp++) 189 *xipp++ = *sipp; 190 for (sipp = set; sipp < set_end; sipp++) 191 *xipp++ = *sipp; 192 if (newsysinit) 193 free(newsysinit, M_TEMP); 194 newsysinit = newset; 195 newsysinit_end = newset + count; 196 } 197 198 #if defined (DDB) && defined(VERBOSE_SYSINIT) 199 static const char * 200 symbol_name(vm_offset_t va, db_strategy_t strategy) 201 { 202 const char *name; 203 c_db_sym_t sym; 204 db_expr_t offset; 205 206 if (va == 0) 207 return (NULL); 208 sym = db_search_symbol(va, strategy, &offset); 209 if (offset != 0) 210 return (NULL); 211 db_symbol_values(sym, &name, NULL); 212 return (name); 213 } 214 #endif 215 216 /* 217 * System startup; initialize the world, create process 0, mount root 218 * filesystem, and fork to create init and pagedaemon. Most of the 219 * hard work is done in the lower-level initialization routines including 220 * startup(), which does memory initialization and autoconfiguration. 221 * 222 * This allows simple addition of new kernel subsystems that require 223 * boot time initialization. It also allows substitution of subsystem 224 * (for instance, a scheduler, kernel profiler, or VM system) by object 225 * module. Finally, it allows for optional "kernel threads". 226 */ 227 void 228 mi_startup(void) 229 { 230 231 struct sysinit **sipp; /* system initialization*/ 232 struct sysinit **xipp; /* interior loop of sort*/ 233 struct sysinit *save; /* bubble*/ 234 235 #if defined(VERBOSE_SYSINIT) 236 int last; 237 int verbose; 238 #endif 239 240 TSENTER(); 241 242 if (boothowto & RB_VERBOSE) 243 bootverbose++; 244 245 if (sysinit == NULL) { 246 sysinit = SET_BEGIN(sysinit_set); 247 sysinit_end = SET_LIMIT(sysinit_set); 248 } 249 250 restart: 251 /* 252 * Perform a bubble sort of the system initialization objects by 253 * their subsystem (primary key) and order (secondary key). 254 */ 255 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 256 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 257 if ((*sipp)->subsystem < (*xipp)->subsystem || 258 ((*sipp)->subsystem == (*xipp)->subsystem && 259 (*sipp)->order <= (*xipp)->order)) 260 continue; /* skip*/ 261 save = *sipp; 262 *sipp = *xipp; 263 *xipp = save; 264 } 265 } 266 267 #if defined(VERBOSE_SYSINIT) 268 last = SI_SUB_COPYRIGHT; 269 verbose = 0; 270 #if !defined(DDB) 271 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 272 #endif 273 #endif 274 275 /* 276 * Traverse the (now) ordered list of system initialization tasks. 277 * Perform each task, and continue on to the next task. 278 */ 279 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 280 281 if ((*sipp)->subsystem == SI_SUB_DUMMY) 282 continue; /* skip dummy task(s)*/ 283 284 if ((*sipp)->subsystem == SI_SUB_DONE) 285 continue; 286 287 #if defined(VERBOSE_SYSINIT) 288 if ((*sipp)->subsystem > last && verbose_sysinit != 0) { 289 verbose = 1; 290 last = (*sipp)->subsystem; 291 printf("subsystem %x\n", last); 292 } 293 if (verbose) { 294 #if defined(DDB) 295 const char *func, *data; 296 297 func = symbol_name((vm_offset_t)(*sipp)->func, 298 DB_STGY_PROC); 299 data = symbol_name((vm_offset_t)(*sipp)->udata, 300 DB_STGY_ANY); 301 if (func != NULL && data != NULL) 302 printf(" %s(&%s)... ", func, data); 303 else if (func != NULL) 304 printf(" %s(%p)... ", func, (*sipp)->udata); 305 else 306 #endif 307 printf(" %p(%p)... ", (*sipp)->func, 308 (*sipp)->udata); 309 } 310 #endif 311 312 /* Call function */ 313 (*((*sipp)->func))((*sipp)->udata); 314 315 #if defined(VERBOSE_SYSINIT) 316 if (verbose) 317 printf("done.\n"); 318 #endif 319 320 /* Check off the one we're just done */ 321 (*sipp)->subsystem = SI_SUB_DONE; 322 323 /* Check if we've installed more sysinit items via KLD */ 324 if (newsysinit != NULL) { 325 if (sysinit != SET_BEGIN(sysinit_set)) 326 free(sysinit, M_TEMP); 327 sysinit = newsysinit; 328 sysinit_end = newsysinit_end; 329 newsysinit = NULL; 330 newsysinit_end = NULL; 331 goto restart; 332 } 333 } 334 335 TSEXIT(); /* Here so we don't overlap with start_init. */ 336 337 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 338 mtx_unlock(&Giant); 339 340 /* 341 * Now hand over this thread to swapper. 342 */ 343 swapper(); 344 /* NOTREACHED*/ 345 } 346 347 static void 348 print_caddr_t(void *data) 349 { 350 printf("%s", (char *)data); 351 } 352 353 static void 354 print_version(void *data __unused) 355 { 356 int len; 357 358 /* Strip a trailing newline from version. */ 359 len = strlen(version); 360 while (len > 0 && version[len - 1] == '\n') 361 len--; 362 printf("%.*s %s\n", len, version, machine); 363 printf("%s\n", compiler_version); 364 } 365 366 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 367 copyright); 368 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 369 trademark); 370 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 371 372 #ifdef WITNESS 373 static char wit_warn[] = 374 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 375 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 376 print_caddr_t, wit_warn); 377 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1, 378 print_caddr_t, wit_warn); 379 #endif 380 381 #ifdef DIAGNOSTIC 382 static char diag_warn[] = 383 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 384 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 385 print_caddr_t, diag_warn); 386 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2, 387 print_caddr_t, diag_warn); 388 #endif 389 390 static int 391 null_fetch_syscall_args(struct thread *td __unused) 392 { 393 394 panic("null_fetch_syscall_args"); 395 } 396 397 static void 398 null_set_syscall_retval(struct thread *td __unused, int error __unused) 399 { 400 401 panic("null_set_syscall_retval"); 402 } 403 404 struct sysentvec null_sysvec = { 405 .sv_size = 0, 406 .sv_table = NULL, 407 .sv_errsize = 0, 408 .sv_errtbl = NULL, 409 .sv_transtrap = NULL, 410 .sv_fixup = NULL, 411 .sv_sendsig = NULL, 412 .sv_sigcode = NULL, 413 .sv_szsigcode = NULL, 414 .sv_name = "null", 415 .sv_coredump = NULL, 416 .sv_imgact_try = NULL, 417 .sv_minsigstksz = 0, 418 .sv_minuser = VM_MIN_ADDRESS, 419 .sv_maxuser = VM_MAXUSER_ADDRESS, 420 .sv_usrstack = USRSTACK, 421 .sv_psstrings = PS_STRINGS, 422 .sv_stackprot = VM_PROT_ALL, 423 .sv_copyout_strings = NULL, 424 .sv_setregs = NULL, 425 .sv_fixlimit = NULL, 426 .sv_maxssiz = NULL, 427 .sv_flags = 0, 428 .sv_set_syscall_retval = null_set_syscall_retval, 429 .sv_fetch_syscall_args = null_fetch_syscall_args, 430 .sv_syscallnames = NULL, 431 .sv_schedtail = NULL, 432 .sv_thread_detach = NULL, 433 .sv_trap = NULL, 434 }; 435 436 /* 437 * The two following SYSINIT's are proc0 specific glue code. I am not 438 * convinced that they can not be safely combined, but their order of 439 * operation has been maintained as the same as the original init_main.c 440 * for right now. 441 */ 442 /* ARGSUSED*/ 443 static void 444 proc0_init(void *dummy __unused) 445 { 446 struct proc *p; 447 struct thread *td; 448 struct ucred *newcred; 449 struct uidinfo tmpuinfo; 450 struct loginclass tmplc = { 451 .lc_name = "", 452 }; 453 vm_paddr_t pageablemem; 454 int i; 455 456 GIANT_REQUIRED; 457 p = &proc0; 458 td = &thread0; 459 460 /* 461 * Initialize magic number and osrel. 462 */ 463 p->p_magic = P_MAGIC; 464 p->p_osrel = osreldate; 465 466 /* 467 * Initialize thread and process structures. 468 */ 469 procinit(); /* set up proc zone */ 470 threadinit(); /* set up UMA zones */ 471 472 /* 473 * Initialise scheduler resources. 474 * Add scheduler specific parts to proc, thread as needed. 475 */ 476 schedinit(); /* scheduler gets its house in order */ 477 478 /* 479 * Create process 0 (the swapper). 480 */ 481 LIST_INSERT_HEAD(&allproc, p, p_list); 482 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 483 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 484 p->p_pgrp = &pgrp0; 485 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 486 LIST_INIT(&pgrp0.pg_members); 487 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 488 489 pgrp0.pg_session = &session0; 490 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 491 refcount_init(&session0.s_count, 1); 492 session0.s_leader = p; 493 494 p->p_sysent = &null_sysvec; 495 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC; 496 p->p_flag2 = 0; 497 p->p_state = PRS_NORMAL; 498 p->p_klist = knlist_alloc(&p->p_mtx); 499 STAILQ_INIT(&p->p_ktr); 500 p->p_nice = NZERO; 501 /* pid_max cannot be greater than PID_MAX */ 502 td->td_tid = PID_MAX + 1; 503 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 504 td->td_state = TDS_RUNNING; 505 td->td_pri_class = PRI_TIMESHARE; 506 td->td_user_pri = PUSER; 507 td->td_base_user_pri = PUSER; 508 td->td_lend_user_pri = PRI_MAX; 509 td->td_priority = PVM; 510 td->td_base_pri = PVM; 511 td->td_oncpu = curcpu; 512 td->td_flags = TDF_INMEM; 513 td->td_pflags = TDP_KTHREAD; 514 td->td_cpuset = cpuset_thread0(); 515 td->td_domain.dr_policy = td->td_cpuset->cs_domain; 516 prison0_init(); 517 p->p_peers = 0; 518 p->p_leader = p; 519 p->p_reaper = p; 520 p->p_treeflag |= P_TREE_REAPER; 521 LIST_INIT(&p->p_reaplist); 522 523 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 524 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 525 526 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 527 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 528 callout_init(&td->td_slpcallout, 1); 529 530 /* Create credentials. */ 531 newcred = crget(); 532 newcred->cr_ngroups = 1; /* group 0 */ 533 /* A hack to prevent uifind from tripping over NULL pointers. */ 534 curthread->td_ucred = newcred; 535 tmpuinfo.ui_uid = 1; 536 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo; 537 newcred->cr_uidinfo = uifind(0); 538 newcred->cr_ruidinfo = uifind(0); 539 newcred->cr_loginclass = &tmplc; 540 newcred->cr_loginclass = loginclass_find("default"); 541 /* End hack. creds get properly set later with thread_cow_get_proc */ 542 curthread->td_ucred = NULL; 543 newcred->cr_prison = &prison0; 544 newcred->cr_users++; /* avoid assertion failure */ 545 proc_set_cred_init(p, newcred); 546 newcred->cr_users--; 547 crfree(newcred); 548 #ifdef AUDIT 549 audit_cred_kproc0(newcred); 550 #endif 551 #ifdef MAC 552 mac_cred_create_swapper(newcred); 553 #endif 554 /* Create sigacts. */ 555 p->p_sigacts = sigacts_alloc(); 556 557 /* Initialize signal state for process 0. */ 558 siginit(&proc0); 559 560 /* Create the file descriptor table. */ 561 p->p_fd = fdinit(NULL, false, NULL); 562 p->p_fdtol = NULL; 563 564 /* Create the limits structures. */ 565 p->p_limit = lim_alloc(); 566 for (i = 0; i < RLIM_NLIMITS; i++) 567 p->p_limit->pl_rlimit[i].rlim_cur = 568 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 569 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 570 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 571 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 572 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 573 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 574 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 575 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 576 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 577 /* Cast to avoid overflow on i386/PAE. */ 578 pageablemem = ptoa((vm_paddr_t)vm_free_count()); 579 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 580 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 581 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 582 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 583 p->p_cpulimit = RLIM_INFINITY; 584 585 PROC_LOCK(p); 586 thread_cow_get_proc(td, p); 587 PROC_UNLOCK(p); 588 589 /* Initialize resource accounting structures. */ 590 racct_create(&p->p_racct); 591 592 p->p_stats = pstats_alloc(); 593 594 /* Allocate a prototype map so we have something to fork. */ 595 p->p_vmspace = &vmspace0; 596 vmspace0.vm_refcnt = 1; 597 pmap_pinit0(vmspace_pmap(&vmspace0)); 598 599 /* 600 * proc0 is not expected to enter usermode, so there is no special 601 * handling for sv_minuser here, like is done for exec_new_vmspace(). 602 */ 603 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 604 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 605 606 /* 607 * Call the init and ctor for the new thread and proc. We wait 608 * to do this until all other structures are fairly sane. 609 */ 610 EVENTHANDLER_DIRECT_INVOKE(process_init, p); 611 EVENTHANDLER_DIRECT_INVOKE(thread_init, td); 612 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p); 613 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td); 614 615 /* 616 * Charge root for one process. 617 */ 618 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 619 PROC_LOCK(p); 620 racct_add_force(p, RACCT_NPROC, 1); 621 PROC_UNLOCK(p); 622 } 623 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 624 625 /* ARGSUSED*/ 626 static void 627 proc0_post(void *dummy __unused) 628 { 629 struct proc *p; 630 struct rusage ru; 631 struct thread *td; 632 633 /* 634 * Now we can look at the time, having had a chance to verify the 635 * time from the filesystem. Pretend that proc0 started now. 636 */ 637 sx_slock(&allproc_lock); 638 FOREACH_PROC_IN_SYSTEM(p) { 639 PROC_LOCK(p); 640 if (p->p_state == PRS_NEW) { 641 PROC_UNLOCK(p); 642 continue; 643 } 644 microuptime(&p->p_stats->p_start); 645 PROC_STATLOCK(p); 646 rufetch(p, &ru); /* Clears thread stats */ 647 p->p_rux.rux_runtime = 0; 648 p->p_rux.rux_uticks = 0; 649 p->p_rux.rux_sticks = 0; 650 p->p_rux.rux_iticks = 0; 651 PROC_STATUNLOCK(p); 652 FOREACH_THREAD_IN_PROC(p, td) { 653 td->td_runtime = 0; 654 } 655 PROC_UNLOCK(p); 656 } 657 sx_sunlock(&allproc_lock); 658 PCPU_SET(switchtime, cpu_ticks()); 659 PCPU_SET(switchticks, ticks); 660 } 661 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 662 663 /* 664 *************************************************************************** 665 **** 666 **** The following SYSINIT's and glue code should be moved to the 667 **** respective files on a per subsystem basis. 668 **** 669 *************************************************************************** 670 */ 671 672 /* 673 * List of paths to try when searching for "init". 674 */ 675 static char init_path[MAXPATHLEN] = 676 #ifdef INIT_PATH 677 __XSTRING(INIT_PATH); 678 #else 679 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 680 #endif 681 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 682 "Path used to search the init process"); 683 684 /* 685 * Shutdown timeout of init(8). 686 * Unused within kernel, but used to control init(8), hence do not remove. 687 */ 688 #ifndef INIT_SHUTDOWN_TIMEOUT 689 #define INIT_SHUTDOWN_TIMEOUT 120 690 #endif 691 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 692 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 693 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 694 "Unused within kernel, but used to control init(8)"); 695 696 /* 697 * Start the initial user process; try exec'ing each pathname in init_path. 698 * The program is invoked with one argument containing the boot flags. 699 */ 700 static void 701 start_init(void *dummy) 702 { 703 struct image_args args; 704 int error; 705 char *var, *path; 706 char *free_init_path, *tmp_init_path; 707 struct thread *td; 708 struct proc *p; 709 struct vmspace *oldvmspace; 710 711 TSENTER(); /* Here so we don't overlap with mi_startup. */ 712 713 td = curthread; 714 p = td->td_proc; 715 716 vfs_mountroot(); 717 718 /* Wipe GELI passphrase from the environment. */ 719 kern_unsetenv("kern.geom.eli.passphrase"); 720 721 if ((var = kern_getenv("init_path")) != NULL) { 722 strlcpy(init_path, var, sizeof(init_path)); 723 freeenv(var); 724 } 725 free_init_path = tmp_init_path = strdup(init_path, M_TEMP); 726 727 while ((path = strsep(&tmp_init_path, ":")) != NULL) { 728 if (bootverbose) 729 printf("start_init: trying %s\n", path); 730 731 memset(&args, 0, sizeof(args)); 732 error = exec_alloc_args(&args); 733 if (error != 0) 734 panic("%s: Can't allocate space for init arguments %d", 735 __func__, error); 736 737 error = exec_args_add_fname(&args, path, UIO_SYSSPACE); 738 if (error != 0) 739 panic("%s: Can't add fname %d", __func__, error); 740 error = exec_args_add_arg(&args, path, UIO_SYSSPACE); 741 if (error != 0) 742 panic("%s: Can't add argv[0] %d", __func__, error); 743 if (boothowto & RB_SINGLE) 744 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE); 745 if (error != 0) 746 panic("%s: Can't add argv[0] %d", __func__, error); 747 748 /* 749 * Now try to exec the program. If can't for any reason 750 * other than it doesn't exist, complain. 751 * 752 * Otherwise, return via fork_trampoline() all the way 753 * to user mode as init! 754 */ 755 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0, 756 ("nested execve")); 757 oldvmspace = td->td_proc->p_vmspace; 758 error = kern_execve(td, &args, NULL); 759 KASSERT(error != 0, 760 ("kern_execve returned success, not EJUSTRETURN")); 761 if (error == EJUSTRETURN) { 762 if ((td->td_pflags & TDP_EXECVMSPC) != 0) { 763 KASSERT(p->p_vmspace != oldvmspace, 764 ("oldvmspace still used")); 765 vmspace_free(oldvmspace); 766 td->td_pflags &= ~TDP_EXECVMSPC; 767 } 768 free(free_init_path, M_TEMP); 769 TSEXIT(); 770 return; 771 } 772 if (error != ENOENT) 773 printf("exec %s: error %d\n", path, error); 774 } 775 free(free_init_path, M_TEMP); 776 printf("init: not found in path %s\n", init_path); 777 panic("no init"); 778 } 779 780 /* 781 * Like kproc_create(), but runs in its own address space. We do this 782 * early to reserve pid 1. Note special case - do not make it 783 * runnable yet, init execution is started when userspace can be served. 784 */ 785 static void 786 create_init(const void *udata __unused) 787 { 788 struct fork_req fr; 789 struct ucred *newcred, *oldcred; 790 struct thread *td; 791 int error; 792 793 bzero(&fr, sizeof(fr)); 794 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED; 795 fr.fr_procp = &initproc; 796 error = fork1(&thread0, &fr); 797 if (error) 798 panic("cannot fork init: %d\n", error); 799 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 800 /* divorce init's credentials from the kernel's */ 801 newcred = crget(); 802 sx_xlock(&proctree_lock); 803 PROC_LOCK(initproc); 804 initproc->p_flag |= P_SYSTEM | P_INMEM; 805 initproc->p_treeflag |= P_TREE_REAPER; 806 oldcred = initproc->p_ucred; 807 crcopy(newcred, oldcred); 808 #ifdef MAC 809 mac_cred_create_init(newcred); 810 #endif 811 #ifdef AUDIT 812 audit_cred_proc1(newcred); 813 #endif 814 proc_set_cred(initproc, newcred); 815 td = FIRST_THREAD_IN_PROC(initproc); 816 crcowfree(td); 817 td->td_realucred = crcowget(initproc->p_ucred); 818 td->td_ucred = td->td_realucred; 819 PROC_UNLOCK(initproc); 820 sx_xunlock(&proctree_lock); 821 crfree(oldcred); 822 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc), 823 start_init, NULL); 824 } 825 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 826 827 /* 828 * Make it runnable now. 829 */ 830 static void 831 kick_init(const void *udata __unused) 832 { 833 struct thread *td; 834 835 td = FIRST_THREAD_IN_PROC(initproc); 836 thread_lock(td); 837 TD_SET_CAN_RUN(td); 838 sched_add(td, SRQ_BORING); 839 } 840 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL); 841