1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1986, 1988, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include "opt_ddb.h" 43 #include "opt_ekcd.h" 44 #include "opt_gzio.h" 45 #include "opt_kdb.h" 46 #include "opt_panic.h" 47 #include "opt_sched.h" 48 #include "opt_watchdog.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/bio.h> 53 #include <sys/buf.h> 54 #include <sys/conf.h> 55 #include <sys/cons.h> 56 #include <sys/eventhandler.h> 57 #include <sys/filedesc.h> 58 #include <sys/gzio.h> 59 #include <sys/jail.h> 60 #include <sys/kdb.h> 61 #include <sys/kernel.h> 62 #include <sys/kerneldump.h> 63 #include <sys/kthread.h> 64 #include <sys/ktr.h> 65 #include <sys/malloc.h> 66 #include <sys/mount.h> 67 #include <sys/priv.h> 68 #include <sys/proc.h> 69 #include <sys/reboot.h> 70 #include <sys/resourcevar.h> 71 #include <sys/rwlock.h> 72 #include <sys/sched.h> 73 #include <sys/smp.h> 74 #include <sys/sysctl.h> 75 #include <sys/sysproto.h> 76 #include <sys/vnode.h> 77 #include <sys/watchdog.h> 78 79 #include <crypto/rijndael/rijndael-api-fst.h> 80 #include <crypto/sha2/sha256.h> 81 82 #include <ddb/ddb.h> 83 84 #include <machine/cpu.h> 85 #include <machine/dump.h> 86 #include <machine/pcb.h> 87 #include <machine/smp.h> 88 89 #include <security/mac/mac_framework.h> 90 91 #include <vm/vm.h> 92 #include <vm/vm_object.h> 93 #include <vm/vm_page.h> 94 #include <vm/vm_pager.h> 95 #include <vm/swap_pager.h> 96 97 #include <sys/signalvar.h> 98 99 static MALLOC_DEFINE(M_DUMPER, "dumper", "dumper block buffer"); 100 101 #ifndef PANIC_REBOOT_WAIT_TIME 102 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 103 #endif 104 static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME; 105 SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RWTUN, 106 &panic_reboot_wait_time, 0, 107 "Seconds to wait before rebooting after a panic"); 108 109 /* 110 * Note that stdarg.h and the ANSI style va_start macro is used for both 111 * ANSI and traditional C compilers. 112 */ 113 #include <machine/stdarg.h> 114 115 #ifdef KDB 116 #ifdef KDB_UNATTENDED 117 int debugger_on_panic = 0; 118 #else 119 int debugger_on_panic = 1; 120 #endif 121 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, 122 CTLFLAG_RWTUN | CTLFLAG_SECURE, 123 &debugger_on_panic, 0, "Run debugger on kernel panic"); 124 125 #ifdef KDB_TRACE 126 static int trace_on_panic = 1; 127 #else 128 static int trace_on_panic = 0; 129 #endif 130 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, 131 CTLFLAG_RWTUN | CTLFLAG_SECURE, 132 &trace_on_panic, 0, "Print stack trace on kernel panic"); 133 #endif /* KDB */ 134 135 static int sync_on_panic = 0; 136 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN, 137 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 138 139 static bool poweroff_on_panic = 0; 140 SYSCTL_BOOL(_kern, OID_AUTO, poweroff_on_panic, CTLFLAG_RWTUN, 141 &poweroff_on_panic, 0, "Do a power off instead of a reboot on a panic"); 142 143 static bool powercycle_on_panic = 0; 144 SYSCTL_BOOL(_kern, OID_AUTO, powercycle_on_panic, CTLFLAG_RWTUN, 145 &powercycle_on_panic, 0, "Do a power cycle instead of a reboot on a panic"); 146 147 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, 148 "Shutdown environment"); 149 150 #ifndef DIAGNOSTIC 151 static int show_busybufs; 152 #else 153 static int show_busybufs = 1; 154 #endif 155 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, 156 &show_busybufs, 0, ""); 157 158 int suspend_blocked = 0; 159 SYSCTL_INT(_kern, OID_AUTO, suspend_blocked, CTLFLAG_RW, 160 &suspend_blocked, 0, "Block suspend due to a pending shutdown"); 161 162 #ifdef EKCD 163 FEATURE(ekcd, "Encrypted kernel crash dumps support"); 164 165 MALLOC_DEFINE(M_EKCD, "ekcd", "Encrypted kernel crash dumps data"); 166 167 struct kerneldumpcrypto { 168 uint8_t kdc_encryption; 169 uint8_t kdc_iv[KERNELDUMP_IV_MAX_SIZE]; 170 keyInstance kdc_ki; 171 cipherInstance kdc_ci; 172 uint32_t kdc_dumpkeysize; 173 struct kerneldumpkey kdc_dumpkey[]; 174 }; 175 #endif 176 177 #ifdef GZIO 178 struct kerneldumpgz { 179 struct gzio_stream *kdgz_stream; 180 uint8_t *kdgz_buf; 181 size_t kdgz_resid; 182 }; 183 184 static struct kerneldumpgz *kerneldumpgz_create(struct dumperinfo *di, 185 uint8_t compression); 186 static void kerneldumpgz_destroy(struct dumperinfo *di); 187 static int kerneldumpgz_write_cb(void *cb, size_t len, off_t off, void *arg); 188 189 static int kerneldump_gzlevel = 6; 190 SYSCTL_INT(_kern, OID_AUTO, kerneldump_gzlevel, CTLFLAG_RWTUN, 191 &kerneldump_gzlevel, 0, 192 "Kernel crash dump gzip compression level"); 193 #endif /* GZIO */ 194 195 /* 196 * Variable panicstr contains argument to first call to panic; used as flag 197 * to indicate that the kernel has already called panic. 198 */ 199 const char *panicstr; 200 201 int dumping; /* system is dumping */ 202 int rebooting; /* system is rebooting */ 203 static struct dumperinfo dumper; /* our selected dumper */ 204 205 /* Context information for dump-debuggers. */ 206 static struct pcb dumppcb; /* Registers. */ 207 lwpid_t dumptid; /* Thread ID. */ 208 209 static struct cdevsw reroot_cdevsw = { 210 .d_version = D_VERSION, 211 .d_name = "reroot", 212 }; 213 214 static void poweroff_wait(void *, int); 215 static void shutdown_halt(void *junk, int howto); 216 static void shutdown_panic(void *junk, int howto); 217 static void shutdown_reset(void *junk, int howto); 218 static int kern_reroot(void); 219 220 /* register various local shutdown events */ 221 static void 222 shutdown_conf(void *unused) 223 { 224 225 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 226 SHUTDOWN_PRI_FIRST); 227 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 228 SHUTDOWN_PRI_LAST + 100); 229 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 230 SHUTDOWN_PRI_LAST + 100); 231 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 232 SHUTDOWN_PRI_LAST + 200); 233 } 234 235 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 236 237 /* 238 * The only reason this exists is to create the /dev/reroot/ directory, 239 * used by reroot code in init(8) as a mountpoint for tmpfs. 240 */ 241 static void 242 reroot_conf(void *unused) 243 { 244 int error; 245 struct cdev *cdev; 246 247 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &cdev, 248 &reroot_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "reroot/reroot"); 249 if (error != 0) { 250 printf("%s: failed to create device node, error %d", 251 __func__, error); 252 } 253 } 254 255 SYSINIT(reroot_conf, SI_SUB_DEVFS, SI_ORDER_ANY, reroot_conf, NULL); 256 257 /* 258 * The system call that results in a reboot. 259 */ 260 /* ARGSUSED */ 261 int 262 sys_reboot(struct thread *td, struct reboot_args *uap) 263 { 264 int error; 265 266 error = 0; 267 #ifdef MAC 268 error = mac_system_check_reboot(td->td_ucred, uap->opt); 269 #endif 270 if (error == 0) 271 error = priv_check(td, PRIV_REBOOT); 272 if (error == 0) { 273 if (uap->opt & RB_REROOT) { 274 error = kern_reroot(); 275 } else { 276 mtx_lock(&Giant); 277 kern_reboot(uap->opt); 278 mtx_unlock(&Giant); 279 } 280 } 281 return (error); 282 } 283 284 /* 285 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 286 */ 287 void 288 shutdown_nice(int howto) 289 { 290 291 if (initproc != NULL) { 292 /* Send a signal to init(8) and have it shutdown the world. */ 293 PROC_LOCK(initproc); 294 if (howto & RB_POWEROFF) 295 kern_psignal(initproc, SIGUSR2); 296 else if (howto & RB_POWERCYCLE) 297 kern_psignal(initproc, SIGWINCH); 298 else if (howto & RB_HALT) 299 kern_psignal(initproc, SIGUSR1); 300 else 301 kern_psignal(initproc, SIGINT); 302 PROC_UNLOCK(initproc); 303 } else { 304 /* No init(8) running, so simply reboot. */ 305 kern_reboot(howto | RB_NOSYNC); 306 } 307 } 308 309 static void 310 print_uptime(void) 311 { 312 int f; 313 struct timespec ts; 314 315 getnanouptime(&ts); 316 printf("Uptime: "); 317 f = 0; 318 if (ts.tv_sec >= 86400) { 319 printf("%ldd", (long)ts.tv_sec / 86400); 320 ts.tv_sec %= 86400; 321 f = 1; 322 } 323 if (f || ts.tv_sec >= 3600) { 324 printf("%ldh", (long)ts.tv_sec / 3600); 325 ts.tv_sec %= 3600; 326 f = 1; 327 } 328 if (f || ts.tv_sec >= 60) { 329 printf("%ldm", (long)ts.tv_sec / 60); 330 ts.tv_sec %= 60; 331 f = 1; 332 } 333 printf("%lds\n", (long)ts.tv_sec); 334 } 335 336 int 337 doadump(boolean_t textdump) 338 { 339 boolean_t coredump; 340 int error; 341 342 error = 0; 343 if (dumping) 344 return (EBUSY); 345 if (dumper.dumper == NULL) 346 return (ENXIO); 347 348 savectx(&dumppcb); 349 dumptid = curthread->td_tid; 350 dumping++; 351 352 coredump = TRUE; 353 #ifdef DDB 354 if (textdump && textdump_pending) { 355 coredump = FALSE; 356 textdump_dumpsys(&dumper); 357 } 358 #endif 359 if (coredump) 360 error = dumpsys(&dumper); 361 362 dumping--; 363 return (error); 364 } 365 366 /* 367 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 368 */ 369 void 370 kern_reboot(int howto) 371 { 372 static int once = 0; 373 374 #if defined(SMP) 375 /* 376 * Bind us to CPU 0 so that all shutdown code runs there. Some 377 * systems don't shutdown properly (i.e., ACPI power off) if we 378 * run on another processor. 379 */ 380 if (!SCHEDULER_STOPPED()) { 381 thread_lock(curthread); 382 sched_bind(curthread, 0); 383 thread_unlock(curthread); 384 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 385 } 386 #endif 387 /* We're in the process of rebooting. */ 388 rebooting = 1; 389 390 /* We are out of the debugger now. */ 391 kdb_active = 0; 392 393 /* 394 * Do any callouts that should be done BEFORE syncing the filesystems. 395 */ 396 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 397 398 /* 399 * Now sync filesystems 400 */ 401 if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) { 402 once = 1; 403 bufshutdown(show_busybufs); 404 } 405 406 print_uptime(); 407 408 cngrab(); 409 410 /* 411 * Ok, now do things that assume all filesystem activity has 412 * been completed. 413 */ 414 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 415 416 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 417 doadump(TRUE); 418 419 /* Now that we're going to really halt the system... */ 420 EVENTHANDLER_INVOKE(shutdown_final, howto); 421 422 for(;;) ; /* safety against shutdown_reset not working */ 423 /* NOTREACHED */ 424 } 425 426 /* 427 * The system call that results in changing the rootfs. 428 */ 429 static int 430 kern_reroot(void) 431 { 432 struct vnode *oldrootvnode, *vp; 433 struct mount *mp, *devmp; 434 int error; 435 436 if (curproc != initproc) 437 return (EPERM); 438 439 /* 440 * Mark the filesystem containing currently-running executable 441 * (the temporary copy of init(8)) busy. 442 */ 443 vp = curproc->p_textvp; 444 error = vn_lock(vp, LK_SHARED); 445 if (error != 0) 446 return (error); 447 mp = vp->v_mount; 448 error = vfs_busy(mp, MBF_NOWAIT); 449 if (error != 0) { 450 vfs_ref(mp); 451 VOP_UNLOCK(vp, 0); 452 error = vfs_busy(mp, 0); 453 vn_lock(vp, LK_SHARED | LK_RETRY); 454 vfs_rel(mp); 455 if (error != 0) { 456 VOP_UNLOCK(vp, 0); 457 return (ENOENT); 458 } 459 if (vp->v_iflag & VI_DOOMED) { 460 VOP_UNLOCK(vp, 0); 461 vfs_unbusy(mp); 462 return (ENOENT); 463 } 464 } 465 VOP_UNLOCK(vp, 0); 466 467 /* 468 * Remove the filesystem containing currently-running executable 469 * from the mount list, to prevent it from being unmounted 470 * by vfs_unmountall(), and to avoid confusing vfs_mountroot(). 471 * 472 * Also preserve /dev - forcibly unmounting it could cause driver 473 * reinitialization. 474 */ 475 476 vfs_ref(rootdevmp); 477 devmp = rootdevmp; 478 rootdevmp = NULL; 479 480 mtx_lock(&mountlist_mtx); 481 TAILQ_REMOVE(&mountlist, mp, mnt_list); 482 TAILQ_REMOVE(&mountlist, devmp, mnt_list); 483 mtx_unlock(&mountlist_mtx); 484 485 oldrootvnode = rootvnode; 486 487 /* 488 * Unmount everything except for the two filesystems preserved above. 489 */ 490 vfs_unmountall(); 491 492 /* 493 * Add /dev back; vfs_mountroot() will move it into its new place. 494 */ 495 mtx_lock(&mountlist_mtx); 496 TAILQ_INSERT_HEAD(&mountlist, devmp, mnt_list); 497 mtx_unlock(&mountlist_mtx); 498 rootdevmp = devmp; 499 vfs_rel(rootdevmp); 500 501 /* 502 * Mount the new rootfs. 503 */ 504 vfs_mountroot(); 505 506 /* 507 * Update all references to the old rootvnode. 508 */ 509 mountcheckdirs(oldrootvnode, rootvnode); 510 511 /* 512 * Add the temporary filesystem back and unbusy it. 513 */ 514 mtx_lock(&mountlist_mtx); 515 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 516 mtx_unlock(&mountlist_mtx); 517 vfs_unbusy(mp); 518 519 return (0); 520 } 521 522 /* 523 * If the shutdown was a clean halt, behave accordingly. 524 */ 525 static void 526 shutdown_halt(void *junk, int howto) 527 { 528 529 if (howto & RB_HALT) { 530 printf("\n"); 531 printf("The operating system has halted.\n"); 532 printf("Please press any key to reboot.\n\n"); 533 switch (cngetc()) { 534 case -1: /* No console, just die */ 535 cpu_halt(); 536 /* NOTREACHED */ 537 default: 538 howto &= ~RB_HALT; 539 break; 540 } 541 } 542 } 543 544 /* 545 * Check to see if the system paniced, pause and then reboot 546 * according to the specified delay. 547 */ 548 static void 549 shutdown_panic(void *junk, int howto) 550 { 551 int loop; 552 553 if (howto & RB_DUMP) { 554 if (panic_reboot_wait_time != 0) { 555 if (panic_reboot_wait_time != -1) { 556 printf("Automatic reboot in %d seconds - " 557 "press a key on the console to abort\n", 558 panic_reboot_wait_time); 559 for (loop = panic_reboot_wait_time * 10; 560 loop > 0; --loop) { 561 DELAY(1000 * 100); /* 1/10th second */ 562 /* Did user type a key? */ 563 if (cncheckc() != -1) 564 break; 565 } 566 if (!loop) 567 return; 568 } 569 } else { /* zero time specified - reboot NOW */ 570 return; 571 } 572 printf("--> Press a key on the console to reboot,\n"); 573 printf("--> or switch off the system now.\n"); 574 cngetc(); 575 } 576 } 577 578 /* 579 * Everything done, now reset 580 */ 581 static void 582 shutdown_reset(void *junk, int howto) 583 { 584 585 printf("Rebooting...\n"); 586 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 587 588 /* 589 * Acquiring smp_ipi_mtx here has a double effect: 590 * - it disables interrupts avoiding CPU0 preemption 591 * by fast handlers (thus deadlocking against other CPUs) 592 * - it avoids deadlocks against smp_rendezvous() or, more 593 * generally, threads busy-waiting, with this spinlock held, 594 * and waiting for responses by threads on other CPUs 595 * (ie. smp_tlb_shootdown()). 596 * 597 * For the !SMP case it just needs to handle the former problem. 598 */ 599 #ifdef SMP 600 mtx_lock_spin(&smp_ipi_mtx); 601 #else 602 spinlock_enter(); 603 #endif 604 605 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 606 cpu_reset(); 607 /* NOTREACHED */ /* assuming reset worked */ 608 } 609 610 #if defined(WITNESS) || defined(INVARIANT_SUPPORT) 611 static int kassert_warn_only = 0; 612 #ifdef KDB 613 static int kassert_do_kdb = 0; 614 #endif 615 #ifdef KTR 616 static int kassert_do_ktr = 0; 617 #endif 618 static int kassert_do_log = 1; 619 static int kassert_log_pps_limit = 4; 620 static int kassert_log_mute_at = 0; 621 static int kassert_log_panic_at = 0; 622 static int kassert_warnings = 0; 623 624 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW, NULL, "kassert options"); 625 626 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, CTLFLAG_RWTUN, 627 &kassert_warn_only, 0, 628 "KASSERT triggers a panic (1) or just a warning (0)"); 629 630 #ifdef KDB 631 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, CTLFLAG_RWTUN, 632 &kassert_do_kdb, 0, "KASSERT will enter the debugger"); 633 #endif 634 635 #ifdef KTR 636 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, CTLFLAG_RWTUN, 637 &kassert_do_ktr, 0, 638 "KASSERT does a KTR, set this to the KTRMASK you want"); 639 #endif 640 641 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, CTLFLAG_RWTUN, 642 &kassert_do_log, 0, "KASSERT triggers a panic (1) or just a warning (0)"); 643 644 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RWTUN, 645 &kassert_warnings, 0, "number of KASSERTs that have been triggered"); 646 647 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, CTLFLAG_RWTUN, 648 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic"); 649 650 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, CTLFLAG_RWTUN, 651 &kassert_log_pps_limit, 0, "limit number of log messages per second"); 652 653 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, CTLFLAG_RWTUN, 654 &kassert_log_mute_at, 0, "max number of KASSERTS to log"); 655 656 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS); 657 658 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert, 659 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0, 660 kassert_sysctl_kassert, "I", "set to trigger a test kassert"); 661 662 static int 663 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS) 664 { 665 int error, i; 666 667 error = sysctl_wire_old_buffer(req, sizeof(int)); 668 if (error == 0) { 669 i = 0; 670 error = sysctl_handle_int(oidp, &i, 0, req); 671 } 672 if (error != 0 || req->newptr == NULL) 673 return (error); 674 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i)); 675 return (0); 676 } 677 678 /* 679 * Called by KASSERT, this decides if we will panic 680 * or if we will log via printf and/or ktr. 681 */ 682 void 683 kassert_panic(const char *fmt, ...) 684 { 685 static char buf[256]; 686 va_list ap; 687 688 va_start(ap, fmt); 689 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 690 va_end(ap); 691 692 /* 693 * panic if we're not just warning, or if we've exceeded 694 * kassert_log_panic_at warnings. 695 */ 696 if (!kassert_warn_only || 697 (kassert_log_panic_at > 0 && 698 kassert_warnings >= kassert_log_panic_at)) { 699 va_start(ap, fmt); 700 vpanic(fmt, ap); 701 /* NORETURN */ 702 } 703 #ifdef KTR 704 if (kassert_do_ktr) 705 CTR0(ktr_mask, buf); 706 #endif /* KTR */ 707 /* 708 * log if we've not yet met the mute limit. 709 */ 710 if (kassert_do_log && 711 (kassert_log_mute_at == 0 || 712 kassert_warnings < kassert_log_mute_at)) { 713 static struct timeval lasterr; 714 static int curerr; 715 716 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) { 717 printf("KASSERT failed: %s\n", buf); 718 kdb_backtrace(); 719 } 720 } 721 #ifdef KDB 722 if (kassert_do_kdb) { 723 kdb_enter(KDB_WHY_KASSERT, buf); 724 } 725 #endif 726 atomic_add_int(&kassert_warnings, 1); 727 } 728 #endif 729 730 /* 731 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 732 * and then reboots. If we are called twice, then we avoid trying to sync 733 * the disks as this often leads to recursive panics. 734 */ 735 void 736 panic(const char *fmt, ...) 737 { 738 va_list ap; 739 740 va_start(ap, fmt); 741 vpanic(fmt, ap); 742 } 743 744 void 745 vpanic(const char *fmt, va_list ap) 746 { 747 #ifdef SMP 748 cpuset_t other_cpus; 749 #endif 750 struct thread *td = curthread; 751 int bootopt, newpanic; 752 static char buf[256]; 753 754 spinlock_enter(); 755 756 #ifdef SMP 757 /* 758 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from 759 * concurrently entering panic. Only the winner will proceed 760 * further. 761 */ 762 if (panicstr == NULL && !kdb_active) { 763 other_cpus = all_cpus; 764 CPU_CLR(PCPU_GET(cpuid), &other_cpus); 765 stop_cpus_hard(other_cpus); 766 } 767 #endif 768 769 /* 770 * Ensure that the scheduler is stopped while panicking, even if panic 771 * has been entered from kdb. 772 */ 773 td->td_stopsched = 1; 774 775 bootopt = RB_AUTOBOOT; 776 newpanic = 0; 777 if (panicstr) 778 bootopt |= RB_NOSYNC; 779 else { 780 bootopt |= RB_DUMP; 781 panicstr = fmt; 782 newpanic = 1; 783 } 784 785 if (newpanic) { 786 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 787 panicstr = buf; 788 cngrab(); 789 printf("panic: %s\n", buf); 790 } else { 791 printf("panic: "); 792 vprintf(fmt, ap); 793 printf("\n"); 794 } 795 #ifdef SMP 796 printf("cpuid = %d\n", PCPU_GET(cpuid)); 797 #endif 798 printf("time = %jd\n", (intmax_t )time_second); 799 #ifdef KDB 800 if (newpanic && trace_on_panic) 801 kdb_backtrace(); 802 if (debugger_on_panic) 803 kdb_enter(KDB_WHY_PANIC, "panic"); 804 #endif 805 /*thread_lock(td); */ 806 td->td_flags |= TDF_INPANIC; 807 /* thread_unlock(td); */ 808 if (!sync_on_panic) 809 bootopt |= RB_NOSYNC; 810 if (poweroff_on_panic) 811 bootopt |= RB_POWEROFF; 812 if (powercycle_on_panic) 813 bootopt |= RB_POWERCYCLE; 814 kern_reboot(bootopt); 815 } 816 817 /* 818 * Support for poweroff delay. 819 * 820 * Please note that setting this delay too short might power off your machine 821 * before the write cache on your hard disk has been flushed, leading to 822 * soft-updates inconsistencies. 823 */ 824 #ifndef POWEROFF_DELAY 825 # define POWEROFF_DELAY 5000 826 #endif 827 static int poweroff_delay = POWEROFF_DELAY; 828 829 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 830 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)"); 831 832 static void 833 poweroff_wait(void *junk, int howto) 834 { 835 836 if ((howto & (RB_POWEROFF | RB_POWERCYCLE)) == 0 || poweroff_delay <= 0) 837 return; 838 DELAY(poweroff_delay * 1000); 839 } 840 841 /* 842 * Some system processes (e.g. syncer) need to be stopped at appropriate 843 * points in their main loops prior to a system shutdown, so that they 844 * won't interfere with the shutdown process (e.g. by holding a disk buf 845 * to cause sync to fail). For each of these system processes, register 846 * shutdown_kproc() as a handler for one of shutdown events. 847 */ 848 static int kproc_shutdown_wait = 60; 849 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 850 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process"); 851 852 void 853 kproc_shutdown(void *arg, int howto) 854 { 855 struct proc *p; 856 int error; 857 858 if (panicstr) 859 return; 860 861 p = (struct proc *)arg; 862 printf("Waiting (max %d seconds) for system process `%s' to stop... ", 863 kproc_shutdown_wait, p->p_comm); 864 error = kproc_suspend(p, kproc_shutdown_wait * hz); 865 866 if (error == EWOULDBLOCK) 867 printf("timed out\n"); 868 else 869 printf("done\n"); 870 } 871 872 void 873 kthread_shutdown(void *arg, int howto) 874 { 875 struct thread *td; 876 int error; 877 878 if (panicstr) 879 return; 880 881 td = (struct thread *)arg; 882 printf("Waiting (max %d seconds) for system thread `%s' to stop... ", 883 kproc_shutdown_wait, td->td_name); 884 error = kthread_suspend(td, kproc_shutdown_wait * hz); 885 886 if (error == EWOULDBLOCK) 887 printf("timed out\n"); 888 else 889 printf("done\n"); 890 } 891 892 static char dumpdevname[sizeof(((struct cdev*)NULL)->si_name)]; 893 SYSCTL_STRING(_kern_shutdown, OID_AUTO, dumpdevname, CTLFLAG_RD, 894 dumpdevname, 0, "Device for kernel dumps"); 895 896 static int _dump_append(struct dumperinfo *di, void *virtual, 897 vm_offset_t physical, size_t length); 898 899 #ifdef EKCD 900 static struct kerneldumpcrypto * 901 kerneldumpcrypto_create(size_t blocksize, uint8_t encryption, 902 const uint8_t *key, uint32_t encryptedkeysize, const uint8_t *encryptedkey) 903 { 904 struct kerneldumpcrypto *kdc; 905 struct kerneldumpkey *kdk; 906 uint32_t dumpkeysize; 907 908 dumpkeysize = roundup2(sizeof(*kdk) + encryptedkeysize, blocksize); 909 kdc = malloc(sizeof(*kdc) + dumpkeysize, M_EKCD, M_WAITOK | M_ZERO); 910 911 arc4rand(kdc->kdc_iv, sizeof(kdc->kdc_iv), 0); 912 913 kdc->kdc_encryption = encryption; 914 switch (kdc->kdc_encryption) { 915 case KERNELDUMP_ENC_AES_256_CBC: 916 if (rijndael_makeKey(&kdc->kdc_ki, DIR_ENCRYPT, 256, key) <= 0) 917 goto failed; 918 break; 919 default: 920 goto failed; 921 } 922 923 kdc->kdc_dumpkeysize = dumpkeysize; 924 kdk = kdc->kdc_dumpkey; 925 kdk->kdk_encryption = kdc->kdc_encryption; 926 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv)); 927 kdk->kdk_encryptedkeysize = htod32(encryptedkeysize); 928 memcpy(kdk->kdk_encryptedkey, encryptedkey, encryptedkeysize); 929 930 return (kdc); 931 failed: 932 explicit_bzero(kdc, sizeof(*kdc) + dumpkeysize); 933 free(kdc, M_EKCD); 934 return (NULL); 935 } 936 937 static int 938 kerneldumpcrypto_init(struct kerneldumpcrypto *kdc) 939 { 940 uint8_t hash[SHA256_DIGEST_LENGTH]; 941 SHA256_CTX ctx; 942 struct kerneldumpkey *kdk; 943 int error; 944 945 error = 0; 946 947 if (kdc == NULL) 948 return (0); 949 950 /* 951 * When a user enters ddb it can write a crash dump multiple times. 952 * Each time it should be encrypted using a different IV. 953 */ 954 SHA256_Init(&ctx); 955 SHA256_Update(&ctx, kdc->kdc_iv, sizeof(kdc->kdc_iv)); 956 SHA256_Final(hash, &ctx); 957 bcopy(hash, kdc->kdc_iv, sizeof(kdc->kdc_iv)); 958 959 switch (kdc->kdc_encryption) { 960 case KERNELDUMP_ENC_AES_256_CBC: 961 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC, 962 kdc->kdc_iv) <= 0) { 963 error = EINVAL; 964 goto out; 965 } 966 break; 967 default: 968 error = EINVAL; 969 goto out; 970 } 971 972 kdk = kdc->kdc_dumpkey; 973 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv)); 974 out: 975 explicit_bzero(hash, sizeof(hash)); 976 return (error); 977 } 978 979 static uint32_t 980 kerneldumpcrypto_dumpkeysize(const struct kerneldumpcrypto *kdc) 981 { 982 983 if (kdc == NULL) 984 return (0); 985 return (kdc->kdc_dumpkeysize); 986 } 987 #endif /* EKCD */ 988 989 #ifdef GZIO 990 static struct kerneldumpgz * 991 kerneldumpgz_create(struct dumperinfo *di, uint8_t compression) 992 { 993 struct kerneldumpgz *kdgz; 994 995 if (compression != KERNELDUMP_COMP_GZIP) 996 return (NULL); 997 kdgz = malloc(sizeof(*kdgz), M_DUMPER, M_WAITOK | M_ZERO); 998 kdgz->kdgz_stream = gzio_init(kerneldumpgz_write_cb, GZIO_DEFLATE, 999 di->maxiosize, kerneldump_gzlevel, di); 1000 if (kdgz->kdgz_stream == NULL) { 1001 free(kdgz, M_DUMPER); 1002 return (NULL); 1003 } 1004 kdgz->kdgz_buf = malloc(di->maxiosize, M_DUMPER, M_WAITOK | M_NODUMP); 1005 return (kdgz); 1006 } 1007 1008 static void 1009 kerneldumpgz_destroy(struct dumperinfo *di) 1010 { 1011 struct kerneldumpgz *kdgz; 1012 1013 kdgz = di->kdgz; 1014 if (kdgz == NULL) 1015 return; 1016 gzio_fini(kdgz->kdgz_stream); 1017 explicit_bzero(kdgz->kdgz_buf, di->maxiosize); 1018 free(kdgz->kdgz_buf, M_DUMPER); 1019 free(kdgz, M_DUMPER); 1020 } 1021 #endif /* GZIO */ 1022 1023 /* Registration of dumpers */ 1024 int 1025 set_dumper(struct dumperinfo *di, const char *devname, struct thread *td, 1026 uint8_t compression, uint8_t encryption, const uint8_t *key, 1027 uint32_t encryptedkeysize, const uint8_t *encryptedkey) 1028 { 1029 size_t wantcopy; 1030 int error; 1031 1032 error = priv_check(td, PRIV_SETDUMPER); 1033 if (error != 0) 1034 return (error); 1035 1036 if (di == NULL) { 1037 error = 0; 1038 goto cleanup; 1039 } 1040 if (dumper.dumper != NULL) 1041 return (EBUSY); 1042 dumper = *di; 1043 dumper.blockbuf = NULL; 1044 dumper.kdc = NULL; 1045 dumper.kdgz = NULL; 1046 1047 if (encryption != KERNELDUMP_ENC_NONE) { 1048 #ifdef EKCD 1049 dumper.kdc = kerneldumpcrypto_create(di->blocksize, encryption, 1050 key, encryptedkeysize, encryptedkey); 1051 if (dumper.kdc == NULL) { 1052 error = EINVAL; 1053 goto cleanup; 1054 } 1055 #else 1056 error = EOPNOTSUPP; 1057 goto cleanup; 1058 #endif 1059 } 1060 1061 wantcopy = strlcpy(dumpdevname, devname, sizeof(dumpdevname)); 1062 if (wantcopy >= sizeof(dumpdevname)) { 1063 printf("set_dumper: device name truncated from '%s' -> '%s'\n", 1064 devname, dumpdevname); 1065 } 1066 1067 if (compression != KERNELDUMP_COMP_NONE) { 1068 #ifdef GZIO 1069 /* 1070 * We currently can't support simultaneous encryption and 1071 * compression. 1072 */ 1073 if (encryption != KERNELDUMP_ENC_NONE) { 1074 error = EOPNOTSUPP; 1075 goto cleanup; 1076 } 1077 dumper.kdgz = kerneldumpgz_create(&dumper, compression); 1078 if (dumper.kdgz == NULL) { 1079 error = EINVAL; 1080 goto cleanup; 1081 } 1082 #else 1083 error = EOPNOTSUPP; 1084 goto cleanup; 1085 #endif 1086 } 1087 1088 dumper.blockbuf = malloc(di->blocksize, M_DUMPER, M_WAITOK | M_ZERO); 1089 return (0); 1090 cleanup: 1091 #ifdef EKCD 1092 if (dumper.kdc != NULL) { 1093 explicit_bzero(dumper.kdc, sizeof(*dumper.kdc) + 1094 dumper.kdc->kdc_dumpkeysize); 1095 free(dumper.kdc, M_EKCD); 1096 } 1097 #endif 1098 1099 #ifdef GZIO 1100 kerneldumpgz_destroy(&dumper); 1101 #endif 1102 1103 if (dumper.blockbuf != NULL) { 1104 explicit_bzero(dumper.blockbuf, dumper.blocksize); 1105 free(dumper.blockbuf, M_DUMPER); 1106 } 1107 explicit_bzero(&dumper, sizeof(dumper)); 1108 dumpdevname[0] = '\0'; 1109 return (error); 1110 } 1111 1112 static int 1113 dump_check_bounds(struct dumperinfo *di, off_t offset, size_t length) 1114 { 1115 1116 if (length != 0 && (offset < di->mediaoffset || 1117 offset - di->mediaoffset + length > di->mediasize)) { 1118 printf("Attempt to write outside dump device boundaries.\n" 1119 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n", 1120 (intmax_t)offset, (intmax_t)di->mediaoffset, 1121 (uintmax_t)length, (intmax_t)di->mediasize); 1122 return (ENOSPC); 1123 } 1124 if (length % di->blocksize != 0) { 1125 printf("Attempt to write partial block of length %ju.\n", 1126 (uintmax_t)length); 1127 return (EINVAL); 1128 } 1129 if (offset % di->blocksize != 0) { 1130 printf("Attempt to write at unaligned offset %jd.\n", 1131 (intmax_t)offset); 1132 return (EINVAL); 1133 } 1134 1135 return (0); 1136 } 1137 1138 #ifdef EKCD 1139 static int 1140 dump_encrypt(struct kerneldumpcrypto *kdc, uint8_t *buf, size_t size) 1141 { 1142 1143 switch (kdc->kdc_encryption) { 1144 case KERNELDUMP_ENC_AES_256_CBC: 1145 if (rijndael_blockEncrypt(&kdc->kdc_ci, &kdc->kdc_ki, buf, 1146 8 * size, buf) <= 0) { 1147 return (EIO); 1148 } 1149 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC, 1150 buf + size - 16 /* IV size for AES-256-CBC */) <= 0) { 1151 return (EIO); 1152 } 1153 break; 1154 default: 1155 return (EINVAL); 1156 } 1157 1158 return (0); 1159 } 1160 1161 /* Encrypt data and call dumper. */ 1162 static int 1163 dump_encrypted_write(struct dumperinfo *di, void *virtual, 1164 vm_offset_t physical, off_t offset, size_t length) 1165 { 1166 static uint8_t buf[KERNELDUMP_BUFFER_SIZE]; 1167 struct kerneldumpcrypto *kdc; 1168 int error; 1169 size_t nbytes; 1170 1171 kdc = di->kdc; 1172 1173 while (length > 0) { 1174 nbytes = MIN(length, sizeof(buf)); 1175 bcopy(virtual, buf, nbytes); 1176 1177 if (dump_encrypt(kdc, buf, nbytes) != 0) 1178 return (EIO); 1179 1180 error = dump_write(di, buf, physical, offset, nbytes); 1181 if (error != 0) 1182 return (error); 1183 1184 offset += nbytes; 1185 virtual = (void *)((uint8_t *)virtual + nbytes); 1186 length -= nbytes; 1187 } 1188 1189 return (0); 1190 } 1191 1192 static int 1193 dump_write_key(struct dumperinfo *di, off_t offset) 1194 { 1195 struct kerneldumpcrypto *kdc; 1196 1197 kdc = di->kdc; 1198 if (kdc == NULL) 1199 return (0); 1200 return (dump_write(di, kdc->kdc_dumpkey, 0, offset, 1201 kdc->kdc_dumpkeysize)); 1202 } 1203 #endif /* EKCD */ 1204 1205 #ifdef GZIO 1206 static int 1207 kerneldumpgz_write_cb(void *base, size_t length, off_t offset, void *arg) 1208 { 1209 struct dumperinfo *di; 1210 size_t resid, rlength; 1211 int error; 1212 1213 di = arg; 1214 1215 if (length % di->blocksize != 0) { 1216 /* 1217 * This must be the final write after flushing the compression 1218 * stream. Write as many full blocks as possible and stash the 1219 * residual data in the dumper's block buffer. It will be 1220 * padded and written in dump_finish(). 1221 */ 1222 rlength = rounddown(length, di->blocksize); 1223 if (rlength != 0) { 1224 error = _dump_append(di, base, 0, rlength); 1225 if (error != 0) 1226 return (error); 1227 } 1228 resid = length - rlength; 1229 memmove(di->blockbuf, (uint8_t *)base + rlength, resid); 1230 di->kdgz->kdgz_resid = resid; 1231 return (EAGAIN); 1232 } 1233 return (_dump_append(di, base, 0, length)); 1234 } 1235 #endif /* GZIO */ 1236 1237 /* 1238 * Write a kerneldumpheader at the specified offset. The header structure is 512 1239 * bytes in size, but we must pad to the device sector size. 1240 */ 1241 static int 1242 dump_write_header(struct dumperinfo *di, struct kerneldumpheader *kdh, 1243 off_t offset) 1244 { 1245 void *buf; 1246 size_t hdrsz; 1247 1248 hdrsz = sizeof(*kdh); 1249 if (hdrsz > di->blocksize) 1250 return (ENOMEM); 1251 1252 if (hdrsz == di->blocksize) 1253 buf = kdh; 1254 else { 1255 buf = di->blockbuf; 1256 memset(buf, 0, di->blocksize); 1257 memcpy(buf, kdh, hdrsz); 1258 } 1259 1260 return (dump_write(di, buf, 0, offset, di->blocksize)); 1261 } 1262 1263 /* 1264 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This is to 1265 * protect us from metadata and metadata from us. 1266 */ 1267 #define SIZEOF_METADATA (64 * 1024) 1268 1269 /* 1270 * Do some preliminary setup for a kernel dump: initialize state for encryption, 1271 * if requested, and make sure that we have enough space on the dump device. 1272 * 1273 * We set things up so that the dump ends before the last sector of the dump 1274 * device, at which the trailing header is written. 1275 * 1276 * +-----------+------+-----+----------------------------+------+ 1277 * | | lhdr | key | ... kernel dump ... | thdr | 1278 * +-----------+------+-----+----------------------------+------+ 1279 * 1 blk opt <------- dump extent --------> 1 blk 1280 * 1281 * Dumps written using dump_append() start at the beginning of the extent. 1282 * Uncompressed dumps will use the entire extent, but compressed dumps typically 1283 * will not. The true length of the dump is recorded in the leading and trailing 1284 * headers once the dump has been completed. 1285 */ 1286 int 1287 dump_start(struct dumperinfo *di, struct kerneldumpheader *kdh) 1288 { 1289 uint64_t dumpextent; 1290 uint32_t keysize; 1291 1292 #ifdef EKCD 1293 int error = kerneldumpcrypto_init(di->kdc); 1294 if (error != 0) 1295 return (error); 1296 keysize = kerneldumpcrypto_dumpkeysize(di->kdc); 1297 #else 1298 keysize = 0; 1299 #endif 1300 1301 dumpextent = dtoh64(kdh->dumpextent); 1302 if (di->mediasize < SIZEOF_METADATA + dumpextent + 2 * di->blocksize + 1303 keysize) { 1304 #ifdef GZIO 1305 if (di->kdgz != NULL) { 1306 /* 1307 * We don't yet know how much space the compressed dump 1308 * will occupy, so try to use the whole swap partition 1309 * (minus the first 64KB) in the hope that the 1310 * compressed dump will fit. If that doesn't turn out to 1311 * be enouch, the bounds checking in dump_write() 1312 * will catch us and cause the dump to fail. 1313 */ 1314 dumpextent = di->mediasize - SIZEOF_METADATA - 1315 2 * di->blocksize - keysize; 1316 kdh->dumpextent = htod64(dumpextent); 1317 } else 1318 #endif 1319 return (E2BIG); 1320 } 1321 1322 /* The offset at which to begin writing the dump. */ 1323 di->dumpoff = di->mediaoffset + di->mediasize - di->blocksize - 1324 dumpextent; 1325 1326 return (0); 1327 } 1328 1329 static int 1330 _dump_append(struct dumperinfo *di, void *virtual, vm_offset_t physical, 1331 size_t length) 1332 { 1333 int error; 1334 1335 #ifdef EKCD 1336 if (di->kdc != NULL) 1337 error = dump_encrypted_write(di, virtual, physical, di->dumpoff, 1338 length); 1339 else 1340 #endif 1341 error = dump_write(di, virtual, physical, di->dumpoff, length); 1342 if (error == 0) 1343 di->dumpoff += length; 1344 return (error); 1345 } 1346 1347 /* 1348 * Write to the dump device starting at dumpoff. When compression is enabled, 1349 * writes to the device will be performed using a callback that gets invoked 1350 * when the compression stream's output buffer is full. 1351 */ 1352 int 1353 dump_append(struct dumperinfo *di, void *virtual, vm_offset_t physical, 1354 size_t length) 1355 { 1356 #ifdef GZIO 1357 void *buf; 1358 1359 if (di->kdgz != NULL) { 1360 /* Bounce through a buffer to avoid gzip CRC errors. */ 1361 if (length > di->maxiosize) 1362 return (EINVAL); 1363 buf = di->kdgz->kdgz_buf; 1364 memmove(buf, virtual, length); 1365 return (gzio_write(di->kdgz->kdgz_stream, buf, length)); 1366 } 1367 #endif 1368 return (_dump_append(di, virtual, physical, length)); 1369 } 1370 1371 /* 1372 * Write to the dump device at the specified offset. 1373 */ 1374 int 1375 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 1376 off_t offset, size_t length) 1377 { 1378 int error; 1379 1380 error = dump_check_bounds(di, offset, length); 1381 if (error != 0) 1382 return (error); 1383 return (di->dumper(di->priv, virtual, physical, offset, length)); 1384 } 1385 1386 /* 1387 * Perform kernel dump finalization: flush the compression stream, if necessary, 1388 * write the leading and trailing kernel dump headers now that we know the true 1389 * length of the dump, and optionally write the encryption key following the 1390 * leading header. 1391 */ 1392 int 1393 dump_finish(struct dumperinfo *di, struct kerneldumpheader *kdh) 1394 { 1395 uint64_t extent; 1396 uint32_t keysize; 1397 int error; 1398 1399 extent = dtoh64(kdh->dumpextent); 1400 1401 #ifdef EKCD 1402 keysize = kerneldumpcrypto_dumpkeysize(di->kdc); 1403 #else 1404 keysize = 0; 1405 #endif 1406 1407 #ifdef GZIO 1408 if (di->kdgz != NULL) { 1409 error = gzio_flush(di->kdgz->kdgz_stream); 1410 if (error == EAGAIN) { 1411 /* We have residual data in di->blockbuf. */ 1412 error = dump_write(di, di->blockbuf, 0, di->dumpoff, 1413 di->blocksize); 1414 di->dumpoff += di->kdgz->kdgz_resid; 1415 di->kdgz->kdgz_resid = 0; 1416 } 1417 if (error != 0) 1418 return (error); 1419 1420 /* 1421 * We now know the size of the compressed dump, so update the 1422 * header accordingly and recompute parity. 1423 */ 1424 kdh->dumplength = htod64(di->dumpoff - 1425 (di->mediaoffset + di->mediasize - di->blocksize - extent)); 1426 kdh->parity = 0; 1427 kdh->parity = kerneldump_parity(kdh); 1428 1429 gzio_reset(di->kdgz->kdgz_stream); 1430 } 1431 #endif 1432 1433 /* 1434 * Write kerneldump headers at the beginning and end of the dump extent. 1435 * Write the key after the leading header. 1436 */ 1437 error = dump_write_header(di, kdh, 1438 di->mediaoffset + di->mediasize - 2 * di->blocksize - extent - 1439 keysize); 1440 if (error != 0) 1441 return (error); 1442 1443 #ifdef EKCD 1444 error = dump_write_key(di, 1445 di->mediaoffset + di->mediasize - di->blocksize - extent - keysize); 1446 if (error != 0) 1447 return (error); 1448 #endif 1449 1450 error = dump_write_header(di, kdh, 1451 di->mediaoffset + di->mediasize - di->blocksize); 1452 if (error != 0) 1453 return (error); 1454 1455 (void)dump_write(di, NULL, 0, 0, 0); 1456 return (0); 1457 } 1458 1459 void 1460 dump_init_header(const struct dumperinfo *di, struct kerneldumpheader *kdh, 1461 char *magic, uint32_t archver, uint64_t dumplen) 1462 { 1463 size_t dstsize; 1464 1465 bzero(kdh, sizeof(*kdh)); 1466 strlcpy(kdh->magic, magic, sizeof(kdh->magic)); 1467 strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 1468 kdh->version = htod32(KERNELDUMPVERSION); 1469 kdh->architectureversion = htod32(archver); 1470 kdh->dumplength = htod64(dumplen); 1471 kdh->dumpextent = kdh->dumplength; 1472 kdh->dumptime = htod64(time_second); 1473 #ifdef EKCD 1474 kdh->dumpkeysize = htod32(kerneldumpcrypto_dumpkeysize(di->kdc)); 1475 #else 1476 kdh->dumpkeysize = 0; 1477 #endif 1478 kdh->blocksize = htod32(di->blocksize); 1479 strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 1480 dstsize = sizeof(kdh->versionstring); 1481 if (strlcpy(kdh->versionstring, version, dstsize) >= dstsize) 1482 kdh->versionstring[dstsize - 2] = '\n'; 1483 if (panicstr != NULL) 1484 strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 1485 #ifdef GZIO 1486 if (di->kdgz != NULL) 1487 kdh->compression = KERNELDUMP_COMP_GZIP; 1488 #endif 1489 kdh->parity = kerneldump_parity(kdh); 1490 } 1491 1492 #ifdef DDB 1493 DB_SHOW_COMMAND(panic, db_show_panic) 1494 { 1495 1496 if (panicstr == NULL) 1497 db_printf("panicstr not set\n"); 1498 else 1499 db_printf("panic: %s\n", panicstr); 1500 } 1501 #endif 1502