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 37 #include <sys/cdefs.h> 38 #include "opt_ddb.h" 39 #include "opt_ekcd.h" 40 #include "opt_kdb.h" 41 #include "opt_panic.h" 42 #include "opt_printf.h" 43 #include "opt_sched.h" 44 #include "opt_watchdog.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/bio.h> 49 #include <sys/boottrace.h> 50 #include <sys/buf.h> 51 #include <sys/conf.h> 52 #include <sys/compressor.h> 53 #include <sys/cons.h> 54 #include <sys/disk.h> 55 #include <sys/eventhandler.h> 56 #include <sys/filedesc.h> 57 #include <sys/jail.h> 58 #include <sys/kdb.h> 59 #include <sys/kernel.h> 60 #include <sys/kerneldump.h> 61 #include <sys/kthread.h> 62 #include <sys/ktr.h> 63 #include <sys/malloc.h> 64 #include <sys/mbuf.h> 65 #include <sys/mount.h> 66 #include <sys/priv.h> 67 #include <sys/proc.h> 68 #include <sys/reboot.h> 69 #include <sys/resourcevar.h> 70 #include <sys/rwlock.h> 71 #include <sys/sbuf.h> 72 #include <sys/sched.h> 73 #include <sys/smp.h> 74 #include <sys/sysctl.h> 75 #include <sys/sysproto.h> 76 #include <sys/taskqueue.h> 77 #include <sys/vnode.h> 78 #include <sys/watchdog.h> 79 80 #include <crypto/chacha20/chacha.h> 81 #include <crypto/rijndael/rijndael-api-fst.h> 82 #include <crypto/sha2/sha256.h> 83 84 #include <ddb/ddb.h> 85 86 #include <machine/cpu.h> 87 #include <machine/dump.h> 88 #include <machine/pcb.h> 89 #include <machine/smp.h> 90 91 #include <security/mac/mac_framework.h> 92 93 #include <vm/vm.h> 94 #include <vm/vm_object.h> 95 #include <vm/vm_page.h> 96 #include <vm/vm_pager.h> 97 #include <vm/swap_pager.h> 98 99 #include <sys/signalvar.h> 100 101 static MALLOC_DEFINE(M_DUMPER, "dumper", "dumper block buffer"); 102 103 #ifndef PANIC_REBOOT_WAIT_TIME 104 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 105 #endif 106 static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME; 107 SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RWTUN, 108 &panic_reboot_wait_time, 0, 109 "Seconds to wait before rebooting after a panic"); 110 static int reboot_wait_time = 0; 111 SYSCTL_INT(_kern, OID_AUTO, reboot_wait_time, CTLFLAG_RWTUN, 112 &reboot_wait_time, 0, 113 "Seconds to wait before rebooting"); 114 115 /* 116 * Note that stdarg.h and the ANSI style va_start macro is used for both 117 * ANSI and traditional C compilers. 118 */ 119 #include <machine/stdarg.h> 120 121 #ifdef KDB 122 #ifdef KDB_UNATTENDED 123 int debugger_on_panic = 0; 124 #else 125 int debugger_on_panic = 1; 126 #endif 127 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, 128 CTLFLAG_RWTUN, &debugger_on_panic, 0, 129 "Run debugger on kernel panic"); 130 131 static bool debugger_on_recursive_panic = false; 132 SYSCTL_BOOL(_debug, OID_AUTO, debugger_on_recursive_panic, 133 CTLFLAG_RWTUN, &debugger_on_recursive_panic, 0, 134 "Run debugger on recursive kernel panic"); 135 136 int debugger_on_trap = 0; 137 SYSCTL_INT(_debug, OID_AUTO, debugger_on_trap, 138 CTLFLAG_RWTUN, &debugger_on_trap, 0, 139 "Run debugger on kernel trap before panic"); 140 141 #ifdef KDB_TRACE 142 static int trace_on_panic = 1; 143 static bool trace_all_panics = true; 144 #else 145 static int trace_on_panic = 0; 146 static bool trace_all_panics = false; 147 #endif 148 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, 149 CTLFLAG_RWTUN | CTLFLAG_SECURE, 150 &trace_on_panic, 0, "Print stack trace on kernel panic"); 151 SYSCTL_BOOL(_debug, OID_AUTO, trace_all_panics, CTLFLAG_RWTUN, 152 &trace_all_panics, 0, "Print stack traces on secondary kernel panics"); 153 #endif /* KDB */ 154 155 static int sync_on_panic = 0; 156 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN, 157 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 158 159 static bool poweroff_on_panic = 0; 160 SYSCTL_BOOL(_kern, OID_AUTO, poweroff_on_panic, CTLFLAG_RWTUN, 161 &poweroff_on_panic, 0, "Do a power off instead of a reboot on a panic"); 162 163 static bool powercycle_on_panic = 0; 164 SYSCTL_BOOL(_kern, OID_AUTO, powercycle_on_panic, CTLFLAG_RWTUN, 165 &powercycle_on_panic, 0, "Do a power cycle instead of a reboot on a panic"); 166 167 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 168 "Shutdown environment"); 169 170 #ifndef DIAGNOSTIC 171 static int show_busybufs; 172 #else 173 static int show_busybufs = 1; 174 #endif 175 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, 176 &show_busybufs, 0, 177 "Show busy buffers during shutdown"); 178 179 int suspend_blocked = 0; 180 SYSCTL_INT(_kern, OID_AUTO, suspend_blocked, CTLFLAG_RW, 181 &suspend_blocked, 0, "Block suspend due to a pending shutdown"); 182 183 #ifdef EKCD 184 FEATURE(ekcd, "Encrypted kernel crash dumps support"); 185 186 MALLOC_DEFINE(M_EKCD, "ekcd", "Encrypted kernel crash dumps data"); 187 188 struct kerneldumpcrypto { 189 uint8_t kdc_encryption; 190 uint8_t kdc_iv[KERNELDUMP_IV_MAX_SIZE]; 191 union { 192 struct { 193 keyInstance aes_ki; 194 cipherInstance aes_ci; 195 } u_aes; 196 struct chacha_ctx u_chacha; 197 } u; 198 #define kdc_ki u.u_aes.aes_ki 199 #define kdc_ci u.u_aes.aes_ci 200 #define kdc_chacha u.u_chacha 201 uint32_t kdc_dumpkeysize; 202 struct kerneldumpkey kdc_dumpkey[]; 203 }; 204 #endif 205 206 struct kerneldumpcomp { 207 uint8_t kdc_format; 208 struct compressor *kdc_stream; 209 uint8_t *kdc_buf; 210 size_t kdc_resid; 211 }; 212 213 static struct kerneldumpcomp *kerneldumpcomp_create(struct dumperinfo *di, 214 uint8_t compression); 215 static void kerneldumpcomp_destroy(struct dumperinfo *di); 216 static int kerneldumpcomp_write_cb(void *base, size_t len, off_t off, void *arg); 217 218 static int kerneldump_gzlevel = 6; 219 SYSCTL_INT(_kern, OID_AUTO, kerneldump_gzlevel, CTLFLAG_RWTUN, 220 &kerneldump_gzlevel, 0, 221 "Kernel crash dump compression level"); 222 223 /* 224 * Variable panicstr contains argument to first call to panic; used as flag 225 * to indicate that the kernel has already called panic. 226 */ 227 const char *panicstr __read_mostly; 228 bool scheduler_stopped __read_frequently; 229 230 int dumping __read_mostly; /* system is dumping */ 231 int rebooting __read_mostly; /* system is rebooting */ 232 bool dumped_core __read_mostly; /* system successfully dumped core */ 233 /* 234 * Used to serialize between sysctl kern.shutdown.dumpdevname and list 235 * modifications via ioctl. 236 */ 237 static struct mtx dumpconf_list_lk; 238 MTX_SYSINIT(dumper_configs, &dumpconf_list_lk, "dumper config list", MTX_DEF); 239 240 /* Our selected dumper(s). */ 241 static TAILQ_HEAD(dumpconflist, dumperinfo) dumper_configs = 242 TAILQ_HEAD_INITIALIZER(dumper_configs); 243 244 /* Context information for dump-debuggers, saved by the dump_savectx() macro. */ 245 struct pcb dumppcb; /* Registers. */ 246 lwpid_t dumptid; /* Thread ID. */ 247 248 static struct cdevsw reroot_cdevsw = { 249 .d_version = D_VERSION, 250 .d_name = "reroot", 251 }; 252 253 static void poweroff_wait(void *, int); 254 static void shutdown_halt(void *junk, int howto); 255 static void shutdown_panic(void *junk, int howto); 256 static void shutdown_reset(void *junk, int howto); 257 static int kern_reroot(void); 258 259 /* register various local shutdown events */ 260 static void 261 shutdown_conf(void *unused) 262 { 263 264 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 265 SHUTDOWN_PRI_FIRST); 266 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 267 SHUTDOWN_PRI_LAST + 100); 268 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 269 SHUTDOWN_PRI_LAST + 200); 270 } 271 272 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 273 274 /* 275 * The only reason this exists is to create the /dev/reroot/ directory, 276 * used by reroot code in init(8) as a mountpoint for tmpfs. 277 */ 278 static void 279 reroot_conf(void *unused) 280 { 281 int error; 282 struct cdev *cdev; 283 284 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &cdev, 285 &reroot_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "reroot/reroot"); 286 if (error != 0) { 287 printf("%s: failed to create device node, error %d", 288 __func__, error); 289 } 290 } 291 292 SYSINIT(reroot_conf, SI_SUB_DEVFS, SI_ORDER_ANY, reroot_conf, NULL); 293 294 /* 295 * The system call that results in a reboot. 296 */ 297 /* ARGSUSED */ 298 int 299 sys_reboot(struct thread *td, struct reboot_args *uap) 300 { 301 int error; 302 303 error = 0; 304 #ifdef MAC 305 error = mac_system_check_reboot(td->td_ucred, uap->opt); 306 #endif 307 if (error == 0) 308 error = priv_check(td, PRIV_REBOOT); 309 if (error == 0) { 310 if (uap->opt & RB_REROOT) 311 error = kern_reroot(); 312 else 313 kern_reboot(uap->opt); 314 } 315 return (error); 316 } 317 318 static void 319 shutdown_nice_task_fn(void *arg, int pending __unused) 320 { 321 int howto; 322 323 howto = (uintptr_t)arg; 324 /* Send a signal to init(8) and have it shutdown the world. */ 325 PROC_LOCK(initproc); 326 if ((howto & RB_POWEROFF) != 0) { 327 BOOTTRACE("SIGUSR2 to init(8)"); 328 kern_psignal(initproc, SIGUSR2); 329 } else if ((howto & RB_POWERCYCLE) != 0) { 330 BOOTTRACE("SIGWINCH to init(8)"); 331 kern_psignal(initproc, SIGWINCH); 332 } else if ((howto & RB_HALT) != 0) { 333 BOOTTRACE("SIGUSR1 to init(8)"); 334 kern_psignal(initproc, SIGUSR1); 335 } else { 336 BOOTTRACE("SIGINT to init(8)"); 337 kern_psignal(initproc, SIGINT); 338 } 339 PROC_UNLOCK(initproc); 340 } 341 342 static struct task shutdown_nice_task = TASK_INITIALIZER(0, 343 &shutdown_nice_task_fn, NULL); 344 345 /* 346 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 347 */ 348 void 349 shutdown_nice(int howto) 350 { 351 352 if (initproc != NULL && !SCHEDULER_STOPPED()) { 353 BOOTTRACE("shutdown initiated"); 354 shutdown_nice_task.ta_context = (void *)(uintptr_t)howto; 355 taskqueue_enqueue(taskqueue_fast, &shutdown_nice_task); 356 } else { 357 /* 358 * No init(8) running, or scheduler would not allow it 359 * to run, so simply reboot. 360 */ 361 kern_reboot(howto | RB_NOSYNC); 362 } 363 } 364 365 static void 366 print_uptime(void) 367 { 368 int f; 369 struct timespec ts; 370 371 getnanouptime(&ts); 372 printf("Uptime: "); 373 f = 0; 374 if (ts.tv_sec >= 86400) { 375 printf("%ldd", (long)ts.tv_sec / 86400); 376 ts.tv_sec %= 86400; 377 f = 1; 378 } 379 if (f || ts.tv_sec >= 3600) { 380 printf("%ldh", (long)ts.tv_sec / 3600); 381 ts.tv_sec %= 3600; 382 f = 1; 383 } 384 if (f || ts.tv_sec >= 60) { 385 printf("%ldm", (long)ts.tv_sec / 60); 386 ts.tv_sec %= 60; 387 f = 1; 388 } 389 printf("%lds\n", (long)ts.tv_sec); 390 } 391 392 int 393 doadump(boolean_t textdump) 394 { 395 boolean_t coredump; 396 int error; 397 398 error = 0; 399 if (dumping) 400 return (EBUSY); 401 if (TAILQ_EMPTY(&dumper_configs)) 402 return (ENXIO); 403 404 dump_savectx(); 405 dumping++; 406 407 coredump = TRUE; 408 #ifdef DDB 409 if (textdump && textdump_pending) { 410 coredump = FALSE; 411 textdump_dumpsys(TAILQ_FIRST(&dumper_configs)); 412 } 413 #endif 414 if (coredump) { 415 struct dumperinfo *di; 416 417 TAILQ_FOREACH(di, &dumper_configs, di_next) { 418 error = dumpsys(di); 419 if (error == 0) { 420 dumped_core = true; 421 break; 422 } 423 } 424 } 425 426 dumping--; 427 return (error); 428 } 429 430 /* 431 * Trace the shutdown reason. 432 */ 433 static void 434 reboottrace(int howto) 435 { 436 if ((howto & RB_DUMP) != 0) { 437 if ((howto & RB_HALT) != 0) 438 BOOTTRACE("system panic: halting..."); 439 if ((howto & RB_POWEROFF) != 0) 440 BOOTTRACE("system panic: powering off..."); 441 if ((howto & (RB_HALT|RB_POWEROFF)) == 0) 442 BOOTTRACE("system panic: rebooting..."); 443 } else { 444 if ((howto & RB_HALT) != 0) 445 BOOTTRACE("system halting..."); 446 if ((howto & RB_POWEROFF) != 0) 447 BOOTTRACE("system powering off..."); 448 if ((howto & (RB_HALT|RB_POWEROFF)) == 0) 449 BOOTTRACE("system rebooting..."); 450 } 451 } 452 453 /* 454 * kern_reboot(9): Shut down the system cleanly to prepare for reboot, halt, or 455 * power off. 456 */ 457 void 458 kern_reboot(int howto) 459 { 460 static int once = 0; 461 462 if (initproc != NULL && curproc != initproc) 463 BOOTTRACE("kernel shutdown (dirty) started"); 464 else 465 BOOTTRACE("kernel shutdown (clean) started"); 466 467 /* 468 * Normal paths here don't hold Giant, but we can wind up here 469 * unexpectedly with it held. Drop it now so we don't have to 470 * drop and pick it up elsewhere. The paths it is locking will 471 * never be returned to, and it is preferable to preclude 472 * deadlock than to lock against code that won't ever 473 * continue. 474 */ 475 while (!SCHEDULER_STOPPED() && mtx_owned(&Giant)) 476 mtx_unlock(&Giant); 477 478 #if defined(SMP) 479 /* 480 * Bind us to the first CPU so that all shutdown code runs there. Some 481 * systems don't shutdown properly (i.e., ACPI power off) if we 482 * run on another processor. 483 */ 484 if (!SCHEDULER_STOPPED()) { 485 thread_lock(curthread); 486 sched_bind(curthread, CPU_FIRST()); 487 thread_unlock(curthread); 488 KASSERT(PCPU_GET(cpuid) == CPU_FIRST(), 489 ("%s: not running on cpu 0", __func__)); 490 } 491 #endif 492 /* We're in the process of rebooting. */ 493 rebooting = 1; 494 reboottrace(howto); 495 496 /* 497 * Do any callouts that should be done BEFORE syncing the filesystems. 498 */ 499 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 500 BOOTTRACE("shutdown pre sync complete"); 501 502 /* 503 * Now sync filesystems 504 */ 505 if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) { 506 once = 1; 507 BOOTTRACE("bufshutdown begin"); 508 bufshutdown(show_busybufs); 509 BOOTTRACE("bufshutdown end"); 510 } 511 512 print_uptime(); 513 514 cngrab(); 515 516 /* 517 * Ok, now do things that assume all filesystem activity has 518 * been completed. 519 */ 520 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 521 BOOTTRACE("shutdown post sync complete"); 522 523 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 524 doadump(TRUE); 525 526 /* Now that we're going to really halt the system... */ 527 BOOTTRACE("shutdown final begin"); 528 529 if (shutdown_trace) 530 boottrace_dump_console(); 531 532 EVENTHANDLER_INVOKE(shutdown_final, howto); 533 534 /* 535 * Call this directly so that reset is attempted even if shutdown 536 * handlers are not yet registered. 537 */ 538 shutdown_reset(NULL, howto); 539 540 for(;;) ; /* safety against shutdown_reset not working */ 541 /* NOTREACHED */ 542 } 543 544 /* 545 * The system call that results in changing the rootfs. 546 */ 547 static int 548 kern_reroot(void) 549 { 550 struct vnode *oldrootvnode, *vp; 551 struct mount *mp, *devmp; 552 int error; 553 554 if (curproc != initproc) 555 return (EPERM); 556 557 /* 558 * Mark the filesystem containing currently-running executable 559 * (the temporary copy of init(8)) busy. 560 */ 561 vp = curproc->p_textvp; 562 error = vn_lock(vp, LK_SHARED); 563 if (error != 0) 564 return (error); 565 mp = vp->v_mount; 566 error = vfs_busy(mp, MBF_NOWAIT); 567 if (error != 0) { 568 vfs_ref(mp); 569 VOP_UNLOCK(vp); 570 error = vfs_busy(mp, 0); 571 vn_lock(vp, LK_SHARED | LK_RETRY); 572 vfs_rel(mp); 573 if (error != 0) { 574 VOP_UNLOCK(vp); 575 return (ENOENT); 576 } 577 if (VN_IS_DOOMED(vp)) { 578 VOP_UNLOCK(vp); 579 vfs_unbusy(mp); 580 return (ENOENT); 581 } 582 } 583 VOP_UNLOCK(vp); 584 585 /* 586 * Remove the filesystem containing currently-running executable 587 * from the mount list, to prevent it from being unmounted 588 * by vfs_unmountall(), and to avoid confusing vfs_mountroot(). 589 * 590 * Also preserve /dev - forcibly unmounting it could cause driver 591 * reinitialization. 592 */ 593 594 vfs_ref(rootdevmp); 595 devmp = rootdevmp; 596 rootdevmp = NULL; 597 598 mtx_lock(&mountlist_mtx); 599 TAILQ_REMOVE(&mountlist, mp, mnt_list); 600 TAILQ_REMOVE(&mountlist, devmp, mnt_list); 601 mtx_unlock(&mountlist_mtx); 602 603 oldrootvnode = rootvnode; 604 605 /* 606 * Unmount everything except for the two filesystems preserved above. 607 */ 608 vfs_unmountall(); 609 610 /* 611 * Add /dev back; vfs_mountroot() will move it into its new place. 612 */ 613 mtx_lock(&mountlist_mtx); 614 TAILQ_INSERT_HEAD(&mountlist, devmp, mnt_list); 615 mtx_unlock(&mountlist_mtx); 616 rootdevmp = devmp; 617 vfs_rel(rootdevmp); 618 619 /* 620 * Mount the new rootfs. 621 */ 622 vfs_mountroot(); 623 624 /* 625 * Update all references to the old rootvnode. 626 */ 627 mountcheckdirs(oldrootvnode, rootvnode); 628 629 /* 630 * Add the temporary filesystem back and unbusy it. 631 */ 632 mtx_lock(&mountlist_mtx); 633 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 634 mtx_unlock(&mountlist_mtx); 635 vfs_unbusy(mp); 636 637 return (0); 638 } 639 640 /* 641 * If the shutdown was a clean halt, behave accordingly. 642 */ 643 static void 644 shutdown_halt(void *junk, int howto) 645 { 646 647 if (howto & RB_HALT) { 648 printf("\n"); 649 printf("The operating system has halted.\n"); 650 printf("Please press any key to reboot.\n\n"); 651 652 wdog_kern_pat(WD_TO_NEVER); 653 654 switch (cngetc()) { 655 case -1: /* No console, just die */ 656 cpu_halt(); 657 /* NOTREACHED */ 658 default: 659 break; 660 } 661 } 662 } 663 664 /* 665 * Check to see if the system panicked, pause and then reboot 666 * according to the specified delay. 667 */ 668 static void 669 shutdown_panic(void *junk, int howto) 670 { 671 int loop; 672 673 if (howto & RB_DUMP) { 674 if (panic_reboot_wait_time != 0) { 675 if (panic_reboot_wait_time != -1) { 676 printf("Automatic reboot in %d seconds - " 677 "press a key on the console to abort\n", 678 panic_reboot_wait_time); 679 for (loop = panic_reboot_wait_time * 10; 680 loop > 0; --loop) { 681 DELAY(1000 * 100); /* 1/10th second */ 682 /* Did user type a key? */ 683 if (cncheckc() != -1) 684 break; 685 } 686 if (!loop) 687 return; 688 } 689 } else { /* zero time specified - reboot NOW */ 690 return; 691 } 692 printf("--> Press a key on the console to reboot,\n"); 693 printf("--> or switch off the system now.\n"); 694 cngetc(); 695 } 696 } 697 698 /* 699 * Everything done, now reset 700 */ 701 static void 702 shutdown_reset(void *junk, int howto) 703 { 704 705 printf("Rebooting...\n"); 706 DELAY(reboot_wait_time * 1000000); 707 708 /* 709 * Acquiring smp_ipi_mtx here has a double effect: 710 * - it disables interrupts avoiding CPU0 preemption 711 * by fast handlers (thus deadlocking against other CPUs) 712 * - it avoids deadlocks against smp_rendezvous() or, more 713 * generally, threads busy-waiting, with this spinlock held, 714 * and waiting for responses by threads on other CPUs 715 * (ie. smp_tlb_shootdown()). 716 * 717 * For the !SMP case it just needs to handle the former problem. 718 */ 719 #ifdef SMP 720 mtx_lock_spin(&smp_ipi_mtx); 721 #else 722 spinlock_enter(); 723 #endif 724 725 cpu_reset(); 726 /* NOTREACHED */ /* assuming reset worked */ 727 } 728 729 #if defined(WITNESS) || defined(INVARIANT_SUPPORT) 730 static int kassert_warn_only = 0; 731 #ifdef KDB 732 static int kassert_do_kdb = 0; 733 #endif 734 #ifdef KTR 735 static int kassert_do_ktr = 0; 736 #endif 737 static int kassert_do_log = 1; 738 static int kassert_log_pps_limit = 4; 739 static int kassert_log_mute_at = 0; 740 static int kassert_log_panic_at = 0; 741 static int kassert_suppress_in_panic = 0; 742 static int kassert_warnings = 0; 743 744 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 745 "kassert options"); 746 747 #ifdef KASSERT_PANIC_OPTIONAL 748 #define KASSERT_RWTUN CTLFLAG_RWTUN 749 #else 750 #define KASSERT_RWTUN CTLFLAG_RDTUN 751 #endif 752 753 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, KASSERT_RWTUN, 754 &kassert_warn_only, 0, 755 "KASSERT triggers a panic (0) or just a warning (1)"); 756 757 #ifdef KDB 758 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, KASSERT_RWTUN, 759 &kassert_do_kdb, 0, "KASSERT will enter the debugger"); 760 #endif 761 762 #ifdef KTR 763 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, KASSERT_RWTUN, 764 &kassert_do_ktr, 0, 765 "KASSERT does a KTR, set this to the KTRMASK you want"); 766 #endif 767 768 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, KASSERT_RWTUN, 769 &kassert_do_log, 0, 770 "If warn_only is enabled, log (1) or do not log (0) assertion violations"); 771 772 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RD | CTLFLAG_STATS, 773 &kassert_warnings, 0, "number of KASSERTs that have been triggered"); 774 775 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, KASSERT_RWTUN, 776 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic"); 777 778 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, KASSERT_RWTUN, 779 &kassert_log_pps_limit, 0, "limit number of log messages per second"); 780 781 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, KASSERT_RWTUN, 782 &kassert_log_mute_at, 0, "max number of KASSERTS to log"); 783 784 SYSCTL_INT(_debug_kassert, OID_AUTO, suppress_in_panic, KASSERT_RWTUN, 785 &kassert_suppress_in_panic, 0, 786 "KASSERTs will be suppressed while handling a panic"); 787 #undef KASSERT_RWTUN 788 789 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS); 790 791 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert, 792 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE, NULL, 0, 793 kassert_sysctl_kassert, "I", 794 "set to trigger a test kassert"); 795 796 static int 797 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS) 798 { 799 int error, i; 800 801 error = sysctl_wire_old_buffer(req, sizeof(int)); 802 if (error == 0) { 803 i = 0; 804 error = sysctl_handle_int(oidp, &i, 0, req); 805 } 806 if (error != 0 || req->newptr == NULL) 807 return (error); 808 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i)); 809 return (0); 810 } 811 812 #ifdef KASSERT_PANIC_OPTIONAL 813 /* 814 * Called by KASSERT, this decides if we will panic 815 * or if we will log via printf and/or ktr. 816 */ 817 void 818 kassert_panic(const char *fmt, ...) 819 { 820 static char buf[256]; 821 va_list ap; 822 823 va_start(ap, fmt); 824 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 825 va_end(ap); 826 827 /* 828 * If we are suppressing secondary panics, log the warning but do not 829 * re-enter panic/kdb. 830 */ 831 if (KERNEL_PANICKED() && kassert_suppress_in_panic) { 832 if (kassert_do_log) { 833 printf("KASSERT failed: %s\n", buf); 834 #ifdef KDB 835 if (trace_all_panics && trace_on_panic) 836 kdb_backtrace(); 837 #endif 838 } 839 return; 840 } 841 842 /* 843 * panic if we're not just warning, or if we've exceeded 844 * kassert_log_panic_at warnings. 845 */ 846 if (!kassert_warn_only || 847 (kassert_log_panic_at > 0 && 848 kassert_warnings >= kassert_log_panic_at)) { 849 va_start(ap, fmt); 850 vpanic(fmt, ap); 851 /* NORETURN */ 852 } 853 #ifdef KTR 854 if (kassert_do_ktr) 855 CTR0(ktr_mask, buf); 856 #endif /* KTR */ 857 /* 858 * log if we've not yet met the mute limit. 859 */ 860 if (kassert_do_log && 861 (kassert_log_mute_at == 0 || 862 kassert_warnings < kassert_log_mute_at)) { 863 static struct timeval lasterr; 864 static int curerr; 865 866 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) { 867 printf("KASSERT failed: %s\n", buf); 868 kdb_backtrace(); 869 } 870 } 871 #ifdef KDB 872 if (kassert_do_kdb) { 873 kdb_enter(KDB_WHY_KASSERT, buf); 874 } 875 #endif 876 atomic_add_int(&kassert_warnings, 1); 877 } 878 #endif /* KASSERT_PANIC_OPTIONAL */ 879 #endif 880 881 /* 882 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 883 * and then reboots. If we are called twice, then we avoid trying to sync 884 * the disks as this often leads to recursive panics. 885 */ 886 void 887 panic(const char *fmt, ...) 888 { 889 va_list ap; 890 891 va_start(ap, fmt); 892 vpanic(fmt, ap); 893 } 894 895 void 896 vpanic(const char *fmt, va_list ap) 897 { 898 #ifdef SMP 899 cpuset_t other_cpus; 900 #endif 901 struct thread *td = curthread; 902 int bootopt, newpanic; 903 static char buf[256]; 904 905 /* 906 * 'fmt' must not be NULL as it is put into 'panicstr' which is then 907 * used as a flag to detect if the kernel has panicked. Also, although 908 * vsnprintf() supports a NULL 'fmt' argument, use a more informative 909 * message. 910 */ 911 if (fmt == NULL) 912 fmt = "<no panic string!>"; 913 914 spinlock_enter(); 915 916 #ifdef SMP 917 /* 918 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from 919 * concurrently entering panic. Only the winner will proceed 920 * further. 921 */ 922 if (!KERNEL_PANICKED() && !kdb_active) { 923 other_cpus = all_cpus; 924 CPU_CLR(PCPU_GET(cpuid), &other_cpus); 925 stop_cpus_hard(other_cpus); 926 } 927 #endif 928 929 /* 930 * Ensure that the scheduler is stopped while panicking, even if panic 931 * has been entered from kdb. 932 */ 933 scheduler_stopped = true; 934 935 bootopt = RB_AUTOBOOT; 936 newpanic = 0; 937 if (KERNEL_PANICKED()) 938 bootopt |= RB_NOSYNC; 939 else { 940 bootopt |= RB_DUMP; 941 panicstr = fmt; 942 newpanic = 1; 943 } 944 945 /* Unmute when panic */ 946 cn_mute = 0; 947 948 if (newpanic) { 949 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 950 panicstr = buf; 951 cngrab(); 952 printf("panic: %s\n", buf); 953 } else { 954 printf("panic: "); 955 vprintf(fmt, ap); 956 printf("\n"); 957 } 958 #ifdef SMP 959 printf("cpuid = %d\n", PCPU_GET(cpuid)); 960 #endif 961 printf("time = %jd\n", (intmax_t )time_second); 962 #ifdef KDB 963 if ((newpanic || trace_all_panics) && trace_on_panic) 964 kdb_backtrace(); 965 if (debugger_on_panic) 966 kdb_enter(KDB_WHY_PANIC, "panic"); 967 else if (!newpanic && debugger_on_recursive_panic) 968 kdb_enter(KDB_WHY_PANIC, "re-panic"); 969 #endif 970 /*thread_lock(td); */ 971 td->td_flags |= TDF_INPANIC; 972 /* thread_unlock(td); */ 973 if (!sync_on_panic) 974 bootopt |= RB_NOSYNC; 975 if (poweroff_on_panic) 976 bootopt |= RB_POWEROFF; 977 if (powercycle_on_panic) 978 bootopt |= RB_POWERCYCLE; 979 kern_reboot(bootopt); 980 } 981 982 /* 983 * Support for poweroff delay. 984 * 985 * Please note that setting this delay too short might power off your machine 986 * before the write cache on your hard disk has been flushed, leading to 987 * soft-updates inconsistencies. 988 */ 989 #ifndef POWEROFF_DELAY 990 # define POWEROFF_DELAY 5000 991 #endif 992 static int poweroff_delay = POWEROFF_DELAY; 993 994 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 995 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)"); 996 997 static void 998 poweroff_wait(void *junk, int howto) 999 { 1000 1001 if ((howto & (RB_POWEROFF | RB_POWERCYCLE)) == 0 || poweroff_delay <= 0) 1002 return; 1003 DELAY(poweroff_delay * 1000); 1004 } 1005 1006 /* 1007 * Some system processes (e.g. syncer) need to be stopped at appropriate 1008 * points in their main loops prior to a system shutdown, so that they 1009 * won't interfere with the shutdown process (e.g. by holding a disk buf 1010 * to cause sync to fail). For each of these system processes, register 1011 * shutdown_kproc() as a handler for one of shutdown events. 1012 */ 1013 static int kproc_shutdown_wait = 60; 1014 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 1015 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process"); 1016 1017 void 1018 kproc_shutdown(void *arg, int howto) 1019 { 1020 struct proc *p; 1021 int error; 1022 1023 if (SCHEDULER_STOPPED()) 1024 return; 1025 1026 p = (struct proc *)arg; 1027 printf("Waiting (max %d seconds) for system process `%s' to stop... ", 1028 kproc_shutdown_wait, p->p_comm); 1029 error = kproc_suspend(p, kproc_shutdown_wait * hz); 1030 1031 if (error == EWOULDBLOCK) 1032 printf("timed out\n"); 1033 else 1034 printf("done\n"); 1035 } 1036 1037 void 1038 kthread_shutdown(void *arg, int howto) 1039 { 1040 struct thread *td; 1041 int error; 1042 1043 if (SCHEDULER_STOPPED()) 1044 return; 1045 1046 td = (struct thread *)arg; 1047 printf("Waiting (max %d seconds) for system thread `%s' to stop... ", 1048 kproc_shutdown_wait, td->td_name); 1049 error = kthread_suspend(td, kproc_shutdown_wait * hz); 1050 1051 if (error == EWOULDBLOCK) 1052 printf("timed out\n"); 1053 else 1054 printf("done\n"); 1055 } 1056 1057 static int 1058 dumpdevname_sysctl_handler(SYSCTL_HANDLER_ARGS) 1059 { 1060 char buf[256]; 1061 struct dumperinfo *di; 1062 struct sbuf sb; 1063 int error; 1064 1065 error = sysctl_wire_old_buffer(req, 0); 1066 if (error != 0) 1067 return (error); 1068 1069 sbuf_new_for_sysctl(&sb, buf, sizeof(buf), req); 1070 1071 mtx_lock(&dumpconf_list_lk); 1072 TAILQ_FOREACH(di, &dumper_configs, di_next) { 1073 if (di != TAILQ_FIRST(&dumper_configs)) 1074 sbuf_putc(&sb, ','); 1075 sbuf_cat(&sb, di->di_devname); 1076 } 1077 mtx_unlock(&dumpconf_list_lk); 1078 1079 error = sbuf_finish(&sb); 1080 sbuf_delete(&sb); 1081 return (error); 1082 } 1083 SYSCTL_PROC(_kern_shutdown, OID_AUTO, dumpdevname, 1084 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, &dumper_configs, 0, 1085 dumpdevname_sysctl_handler, "A", 1086 "Device(s) for kernel dumps"); 1087 1088 static int _dump_append(struct dumperinfo *di, void *virtual, size_t length); 1089 1090 #ifdef EKCD 1091 static struct kerneldumpcrypto * 1092 kerneldumpcrypto_create(size_t blocksize, uint8_t encryption, 1093 const uint8_t *key, uint32_t encryptedkeysize, const uint8_t *encryptedkey) 1094 { 1095 struct kerneldumpcrypto *kdc; 1096 struct kerneldumpkey *kdk; 1097 uint32_t dumpkeysize; 1098 1099 dumpkeysize = roundup2(sizeof(*kdk) + encryptedkeysize, blocksize); 1100 kdc = malloc(sizeof(*kdc) + dumpkeysize, M_EKCD, M_WAITOK | M_ZERO); 1101 1102 arc4rand(kdc->kdc_iv, sizeof(kdc->kdc_iv), 0); 1103 1104 kdc->kdc_encryption = encryption; 1105 switch (kdc->kdc_encryption) { 1106 case KERNELDUMP_ENC_AES_256_CBC: 1107 if (rijndael_makeKey(&kdc->kdc_ki, DIR_ENCRYPT, 256, key) <= 0) 1108 goto failed; 1109 break; 1110 case KERNELDUMP_ENC_CHACHA20: 1111 chacha_keysetup(&kdc->kdc_chacha, key, 256); 1112 break; 1113 default: 1114 goto failed; 1115 } 1116 1117 kdc->kdc_dumpkeysize = dumpkeysize; 1118 kdk = kdc->kdc_dumpkey; 1119 kdk->kdk_encryption = kdc->kdc_encryption; 1120 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv)); 1121 kdk->kdk_encryptedkeysize = htod32(encryptedkeysize); 1122 memcpy(kdk->kdk_encryptedkey, encryptedkey, encryptedkeysize); 1123 1124 return (kdc); 1125 failed: 1126 zfree(kdc, M_EKCD); 1127 return (NULL); 1128 } 1129 1130 static int 1131 kerneldumpcrypto_init(struct kerneldumpcrypto *kdc) 1132 { 1133 uint8_t hash[SHA256_DIGEST_LENGTH]; 1134 SHA256_CTX ctx; 1135 struct kerneldumpkey *kdk; 1136 int error; 1137 1138 error = 0; 1139 1140 if (kdc == NULL) 1141 return (0); 1142 1143 /* 1144 * When a user enters ddb it can write a crash dump multiple times. 1145 * Each time it should be encrypted using a different IV. 1146 */ 1147 SHA256_Init(&ctx); 1148 SHA256_Update(&ctx, kdc->kdc_iv, sizeof(kdc->kdc_iv)); 1149 SHA256_Final(hash, &ctx); 1150 bcopy(hash, kdc->kdc_iv, sizeof(kdc->kdc_iv)); 1151 1152 switch (kdc->kdc_encryption) { 1153 case KERNELDUMP_ENC_AES_256_CBC: 1154 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC, 1155 kdc->kdc_iv) <= 0) { 1156 error = EINVAL; 1157 goto out; 1158 } 1159 break; 1160 case KERNELDUMP_ENC_CHACHA20: 1161 chacha_ivsetup(&kdc->kdc_chacha, kdc->kdc_iv, NULL); 1162 break; 1163 default: 1164 error = EINVAL; 1165 goto out; 1166 } 1167 1168 kdk = kdc->kdc_dumpkey; 1169 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv)); 1170 out: 1171 explicit_bzero(hash, sizeof(hash)); 1172 return (error); 1173 } 1174 1175 static uint32_t 1176 kerneldumpcrypto_dumpkeysize(const struct kerneldumpcrypto *kdc) 1177 { 1178 1179 if (kdc == NULL) 1180 return (0); 1181 return (kdc->kdc_dumpkeysize); 1182 } 1183 #endif /* EKCD */ 1184 1185 static struct kerneldumpcomp * 1186 kerneldumpcomp_create(struct dumperinfo *di, uint8_t compression) 1187 { 1188 struct kerneldumpcomp *kdcomp; 1189 int format; 1190 1191 switch (compression) { 1192 case KERNELDUMP_COMP_GZIP: 1193 format = COMPRESS_GZIP; 1194 break; 1195 case KERNELDUMP_COMP_ZSTD: 1196 format = COMPRESS_ZSTD; 1197 break; 1198 default: 1199 return (NULL); 1200 } 1201 1202 kdcomp = malloc(sizeof(*kdcomp), M_DUMPER, M_WAITOK | M_ZERO); 1203 kdcomp->kdc_format = compression; 1204 kdcomp->kdc_stream = compressor_init(kerneldumpcomp_write_cb, 1205 format, di->maxiosize, kerneldump_gzlevel, di); 1206 if (kdcomp->kdc_stream == NULL) { 1207 free(kdcomp, M_DUMPER); 1208 return (NULL); 1209 } 1210 kdcomp->kdc_buf = malloc(di->maxiosize, M_DUMPER, M_WAITOK | M_NODUMP); 1211 return (kdcomp); 1212 } 1213 1214 static void 1215 kerneldumpcomp_destroy(struct dumperinfo *di) 1216 { 1217 struct kerneldumpcomp *kdcomp; 1218 1219 kdcomp = di->kdcomp; 1220 if (kdcomp == NULL) 1221 return; 1222 compressor_fini(kdcomp->kdc_stream); 1223 zfree(kdcomp->kdc_buf, M_DUMPER); 1224 free(kdcomp, M_DUMPER); 1225 } 1226 1227 /* 1228 * Free a dumper. Must not be present on global list. 1229 */ 1230 void 1231 dumper_destroy(struct dumperinfo *di) 1232 { 1233 1234 if (di == NULL) 1235 return; 1236 1237 zfree(di->blockbuf, M_DUMPER); 1238 kerneldumpcomp_destroy(di); 1239 #ifdef EKCD 1240 zfree(di->kdcrypto, M_EKCD); 1241 #endif 1242 zfree(di, M_DUMPER); 1243 } 1244 1245 /* 1246 * Allocate and set up a new dumper from the provided template. 1247 */ 1248 int 1249 dumper_create(const struct dumperinfo *di_template, const char *devname, 1250 const struct diocskerneldump_arg *kda, struct dumperinfo **dip) 1251 { 1252 struct dumperinfo *newdi; 1253 int error = 0; 1254 1255 if (dip == NULL) 1256 return (EINVAL); 1257 1258 /* Allocate a new dumper */ 1259 newdi = malloc(sizeof(*newdi) + strlen(devname) + 1, M_DUMPER, 1260 M_WAITOK | M_ZERO); 1261 memcpy(newdi, di_template, sizeof(*newdi)); 1262 newdi->blockbuf = NULL; 1263 newdi->kdcrypto = NULL; 1264 newdi->kdcomp = NULL; 1265 strcpy(newdi->di_devname, devname); 1266 1267 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) { 1268 #ifdef EKCD 1269 newdi->kdcrypto = kerneldumpcrypto_create(newdi->blocksize, 1270 kda->kda_encryption, kda->kda_key, 1271 kda->kda_encryptedkeysize, kda->kda_encryptedkey); 1272 if (newdi->kdcrypto == NULL) { 1273 error = EINVAL; 1274 goto cleanup; 1275 } 1276 #else 1277 error = EOPNOTSUPP; 1278 goto cleanup; 1279 #endif 1280 } 1281 if (kda->kda_compression != KERNELDUMP_COMP_NONE) { 1282 #ifdef EKCD 1283 /* 1284 * We can't support simultaneous unpadded block cipher 1285 * encryption and compression because there is no guarantee the 1286 * length of the compressed result is exactly a multiple of the 1287 * cipher block size. 1288 */ 1289 if (kda->kda_encryption == KERNELDUMP_ENC_AES_256_CBC) { 1290 error = EOPNOTSUPP; 1291 goto cleanup; 1292 } 1293 #endif 1294 newdi->kdcomp = kerneldumpcomp_create(newdi, 1295 kda->kda_compression); 1296 if (newdi->kdcomp == NULL) { 1297 error = EINVAL; 1298 goto cleanup; 1299 } 1300 } 1301 newdi->blockbuf = malloc(newdi->blocksize, M_DUMPER, M_WAITOK | M_ZERO); 1302 1303 *dip = newdi; 1304 return (0); 1305 cleanup: 1306 dumper_destroy(newdi); 1307 return (error); 1308 } 1309 1310 /* 1311 * Create a new dumper and register it in the global list. 1312 */ 1313 int 1314 dumper_insert(const struct dumperinfo *di_template, const char *devname, 1315 const struct diocskerneldump_arg *kda) 1316 { 1317 struct dumperinfo *newdi, *listdi; 1318 bool inserted; 1319 uint8_t index; 1320 int error; 1321 1322 index = kda->kda_index; 1323 MPASS(index != KDA_REMOVE && index != KDA_REMOVE_DEV && 1324 index != KDA_REMOVE_ALL); 1325 1326 error = priv_check(curthread, PRIV_SETDUMPER); 1327 if (error != 0) 1328 return (error); 1329 1330 error = dumper_create(di_template, devname, kda, &newdi); 1331 if (error != 0) 1332 return (error); 1333 1334 /* Add the new configuration to the queue */ 1335 mtx_lock(&dumpconf_list_lk); 1336 inserted = false; 1337 TAILQ_FOREACH(listdi, &dumper_configs, di_next) { 1338 if (index == 0) { 1339 TAILQ_INSERT_BEFORE(listdi, newdi, di_next); 1340 inserted = true; 1341 break; 1342 } 1343 index--; 1344 } 1345 if (!inserted) 1346 TAILQ_INSERT_TAIL(&dumper_configs, newdi, di_next); 1347 mtx_unlock(&dumpconf_list_lk); 1348 1349 return (0); 1350 } 1351 1352 #ifdef DDB 1353 void 1354 dumper_ddb_insert(struct dumperinfo *newdi) 1355 { 1356 TAILQ_INSERT_HEAD(&dumper_configs, newdi, di_next); 1357 } 1358 1359 void 1360 dumper_ddb_remove(struct dumperinfo *di) 1361 { 1362 TAILQ_REMOVE(&dumper_configs, di, di_next); 1363 } 1364 #endif 1365 1366 static bool 1367 dumper_config_match(const struct dumperinfo *di, const char *devname, 1368 const struct diocskerneldump_arg *kda) 1369 { 1370 if (kda->kda_index == KDA_REMOVE_ALL) 1371 return (true); 1372 1373 if (strcmp(di->di_devname, devname) != 0) 1374 return (false); 1375 1376 /* 1377 * Allow wildcard removal of configs matching a device on g_dev_orphan. 1378 */ 1379 if (kda->kda_index == KDA_REMOVE_DEV) 1380 return (true); 1381 1382 if (di->kdcomp != NULL) { 1383 if (di->kdcomp->kdc_format != kda->kda_compression) 1384 return (false); 1385 } else if (kda->kda_compression != KERNELDUMP_COMP_NONE) 1386 return (false); 1387 #ifdef EKCD 1388 if (di->kdcrypto != NULL) { 1389 if (di->kdcrypto->kdc_encryption != kda->kda_encryption) 1390 return (false); 1391 /* 1392 * Do we care to verify keys match to delete? It seems weird 1393 * to expect multiple fallback dump configurations on the same 1394 * device that only differ in crypto key. 1395 */ 1396 } else 1397 #endif 1398 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) 1399 return (false); 1400 1401 return (true); 1402 } 1403 1404 /* 1405 * Remove and free the requested dumper(s) from the global list. 1406 */ 1407 int 1408 dumper_remove(const char *devname, const struct diocskerneldump_arg *kda) 1409 { 1410 struct dumperinfo *di, *sdi; 1411 bool found; 1412 int error; 1413 1414 error = priv_check(curthread, PRIV_SETDUMPER); 1415 if (error != 0) 1416 return (error); 1417 1418 /* 1419 * Try to find a matching configuration, and kill it. 1420 * 1421 * NULL 'kda' indicates remove any configuration matching 'devname', 1422 * which may remove multiple configurations in atypical configurations. 1423 */ 1424 found = false; 1425 mtx_lock(&dumpconf_list_lk); 1426 TAILQ_FOREACH_SAFE(di, &dumper_configs, di_next, sdi) { 1427 if (dumper_config_match(di, devname, kda)) { 1428 found = true; 1429 TAILQ_REMOVE(&dumper_configs, di, di_next); 1430 dumper_destroy(di); 1431 } 1432 } 1433 mtx_unlock(&dumpconf_list_lk); 1434 1435 /* Only produce ENOENT if a more targeted match didn't match. */ 1436 if (!found && kda->kda_index == KDA_REMOVE) 1437 return (ENOENT); 1438 return (0); 1439 } 1440 1441 static int 1442 dump_check_bounds(struct dumperinfo *di, off_t offset, size_t length) 1443 { 1444 1445 if (di->mediasize > 0 && length != 0 && (offset < di->mediaoffset || 1446 offset - di->mediaoffset + length > di->mediasize)) { 1447 if (di->kdcomp != NULL && offset >= di->mediaoffset) { 1448 printf( 1449 "Compressed dump failed to fit in device boundaries.\n"); 1450 return (E2BIG); 1451 } 1452 1453 printf("Attempt to write outside dump device boundaries.\n" 1454 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n", 1455 (intmax_t)offset, (intmax_t)di->mediaoffset, 1456 (uintmax_t)length, (intmax_t)di->mediasize); 1457 return (ENOSPC); 1458 } 1459 if (length % di->blocksize != 0) { 1460 printf("Attempt to write partial block of length %ju.\n", 1461 (uintmax_t)length); 1462 return (EINVAL); 1463 } 1464 if (offset % di->blocksize != 0) { 1465 printf("Attempt to write at unaligned offset %jd.\n", 1466 (intmax_t)offset); 1467 return (EINVAL); 1468 } 1469 1470 return (0); 1471 } 1472 1473 #ifdef EKCD 1474 static int 1475 dump_encrypt(struct kerneldumpcrypto *kdc, uint8_t *buf, size_t size) 1476 { 1477 1478 switch (kdc->kdc_encryption) { 1479 case KERNELDUMP_ENC_AES_256_CBC: 1480 if (rijndael_blockEncrypt(&kdc->kdc_ci, &kdc->kdc_ki, buf, 1481 8 * size, buf) <= 0) { 1482 return (EIO); 1483 } 1484 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC, 1485 buf + size - 16 /* IV size for AES-256-CBC */) <= 0) { 1486 return (EIO); 1487 } 1488 break; 1489 case KERNELDUMP_ENC_CHACHA20: 1490 chacha_encrypt_bytes(&kdc->kdc_chacha, buf, buf, size); 1491 break; 1492 default: 1493 return (EINVAL); 1494 } 1495 1496 return (0); 1497 } 1498 1499 /* Encrypt data and call dumper. */ 1500 static int 1501 dump_encrypted_write(struct dumperinfo *di, void *virtual, off_t offset, 1502 size_t length) 1503 { 1504 static uint8_t buf[KERNELDUMP_BUFFER_SIZE]; 1505 struct kerneldumpcrypto *kdc; 1506 int error; 1507 size_t nbytes; 1508 1509 kdc = di->kdcrypto; 1510 1511 while (length > 0) { 1512 nbytes = MIN(length, sizeof(buf)); 1513 bcopy(virtual, buf, nbytes); 1514 1515 if (dump_encrypt(kdc, buf, nbytes) != 0) 1516 return (EIO); 1517 1518 error = dump_write(di, buf, offset, nbytes); 1519 if (error != 0) 1520 return (error); 1521 1522 offset += nbytes; 1523 virtual = (void *)((uint8_t *)virtual + nbytes); 1524 length -= nbytes; 1525 } 1526 1527 return (0); 1528 } 1529 #endif /* EKCD */ 1530 1531 static int 1532 kerneldumpcomp_write_cb(void *base, size_t length, off_t offset, void *arg) 1533 { 1534 struct dumperinfo *di; 1535 size_t resid, rlength; 1536 int error; 1537 1538 di = arg; 1539 1540 if (length % di->blocksize != 0) { 1541 /* 1542 * This must be the final write after flushing the compression 1543 * stream. Write as many full blocks as possible and stash the 1544 * residual data in the dumper's block buffer. It will be 1545 * padded and written in dump_finish(). 1546 */ 1547 rlength = rounddown(length, di->blocksize); 1548 if (rlength != 0) { 1549 error = _dump_append(di, base, rlength); 1550 if (error != 0) 1551 return (error); 1552 } 1553 resid = length - rlength; 1554 memmove(di->blockbuf, (uint8_t *)base + rlength, resid); 1555 bzero((uint8_t *)di->blockbuf + resid, di->blocksize - resid); 1556 di->kdcomp->kdc_resid = resid; 1557 return (EAGAIN); 1558 } 1559 return (_dump_append(di, base, length)); 1560 } 1561 1562 /* 1563 * Write kernel dump headers at the beginning and end of the dump extent. 1564 * Write the kernel dump encryption key after the leading header if we were 1565 * configured to do so. 1566 */ 1567 static int 1568 dump_write_headers(struct dumperinfo *di, struct kerneldumpheader *kdh) 1569 { 1570 #ifdef EKCD 1571 struct kerneldumpcrypto *kdc; 1572 #endif 1573 void *buf; 1574 size_t hdrsz; 1575 uint64_t extent; 1576 uint32_t keysize; 1577 int error; 1578 1579 hdrsz = sizeof(*kdh); 1580 if (hdrsz > di->blocksize) 1581 return (ENOMEM); 1582 1583 #ifdef EKCD 1584 kdc = di->kdcrypto; 1585 keysize = kerneldumpcrypto_dumpkeysize(kdc); 1586 #else 1587 keysize = 0; 1588 #endif 1589 1590 /* 1591 * If the dump device has special handling for headers, let it take care 1592 * of writing them out. 1593 */ 1594 if (di->dumper_hdr != NULL) 1595 return (di->dumper_hdr(di, kdh)); 1596 1597 if (hdrsz == di->blocksize) 1598 buf = kdh; 1599 else { 1600 buf = di->blockbuf; 1601 memset(buf, 0, di->blocksize); 1602 memcpy(buf, kdh, hdrsz); 1603 } 1604 1605 extent = dtoh64(kdh->dumpextent); 1606 #ifdef EKCD 1607 if (kdc != NULL) { 1608 error = dump_write(di, kdc->kdc_dumpkey, 1609 di->mediaoffset + di->mediasize - di->blocksize - extent - 1610 keysize, keysize); 1611 if (error != 0) 1612 return (error); 1613 } 1614 #endif 1615 1616 error = dump_write(di, buf, 1617 di->mediaoffset + di->mediasize - 2 * di->blocksize - extent - 1618 keysize, di->blocksize); 1619 if (error == 0) 1620 error = dump_write(di, buf, di->mediaoffset + di->mediasize - 1621 di->blocksize, di->blocksize); 1622 return (error); 1623 } 1624 1625 /* 1626 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This is to 1627 * protect us from metadata and metadata from us. 1628 */ 1629 #define SIZEOF_METADATA (64 * 1024) 1630 1631 /* 1632 * Do some preliminary setup for a kernel dump: initialize state for encryption, 1633 * if requested, and make sure that we have enough space on the dump device. 1634 * 1635 * We set things up so that the dump ends before the last sector of the dump 1636 * device, at which the trailing header is written. 1637 * 1638 * +-----------+------+-----+----------------------------+------+ 1639 * | | lhdr | key | ... kernel dump ... | thdr | 1640 * +-----------+------+-----+----------------------------+------+ 1641 * 1 blk opt <------- dump extent --------> 1 blk 1642 * 1643 * Dumps written using dump_append() start at the beginning of the extent. 1644 * Uncompressed dumps will use the entire extent, but compressed dumps typically 1645 * will not. The true length of the dump is recorded in the leading and trailing 1646 * headers once the dump has been completed. 1647 * 1648 * The dump device may provide a callback, in which case it will initialize 1649 * dumpoff and take care of laying out the headers. 1650 */ 1651 int 1652 dump_start(struct dumperinfo *di, struct kerneldumpheader *kdh) 1653 { 1654 #ifdef EKCD 1655 struct kerneldumpcrypto *kdc; 1656 #endif 1657 void *key; 1658 uint64_t dumpextent, span; 1659 uint32_t keysize; 1660 int error; 1661 1662 #ifdef EKCD 1663 /* Send the key before the dump so a partial dump is still usable. */ 1664 kdc = di->kdcrypto; 1665 error = kerneldumpcrypto_init(kdc); 1666 if (error != 0) 1667 return (error); 1668 keysize = kerneldumpcrypto_dumpkeysize(kdc); 1669 key = keysize > 0 ? kdc->kdc_dumpkey : NULL; 1670 #else 1671 error = 0; 1672 keysize = 0; 1673 key = NULL; 1674 #endif 1675 1676 if (di->dumper_start != NULL) { 1677 error = di->dumper_start(di, key, keysize); 1678 } else { 1679 dumpextent = dtoh64(kdh->dumpextent); 1680 span = SIZEOF_METADATA + dumpextent + 2 * di->blocksize + 1681 keysize; 1682 if (di->mediasize < span) { 1683 if (di->kdcomp == NULL) 1684 return (E2BIG); 1685 1686 /* 1687 * We don't yet know how much space the compressed dump 1688 * will occupy, so try to use the whole swap partition 1689 * (minus the first 64KB) in the hope that the 1690 * compressed dump will fit. If that doesn't turn out to 1691 * be enough, the bounds checking in dump_write() 1692 * will catch us and cause the dump to fail. 1693 */ 1694 dumpextent = di->mediasize - span + dumpextent; 1695 kdh->dumpextent = htod64(dumpextent); 1696 } 1697 1698 /* 1699 * The offset at which to begin writing the dump. 1700 */ 1701 di->dumpoff = di->mediaoffset + di->mediasize - di->blocksize - 1702 dumpextent; 1703 } 1704 di->origdumpoff = di->dumpoff; 1705 return (error); 1706 } 1707 1708 static int 1709 _dump_append(struct dumperinfo *di, void *virtual, size_t length) 1710 { 1711 int error; 1712 1713 #ifdef EKCD 1714 if (di->kdcrypto != NULL) 1715 error = dump_encrypted_write(di, virtual, di->dumpoff, length); 1716 else 1717 #endif 1718 error = dump_write(di, virtual, di->dumpoff, length); 1719 if (error == 0) 1720 di->dumpoff += length; 1721 return (error); 1722 } 1723 1724 /* 1725 * Write to the dump device starting at dumpoff. When compression is enabled, 1726 * writes to the device will be performed using a callback that gets invoked 1727 * when the compression stream's output buffer is full. 1728 */ 1729 int 1730 dump_append(struct dumperinfo *di, void *virtual, size_t length) 1731 { 1732 void *buf; 1733 1734 if (di->kdcomp != NULL) { 1735 /* Bounce through a buffer to avoid CRC errors. */ 1736 if (length > di->maxiosize) 1737 return (EINVAL); 1738 buf = di->kdcomp->kdc_buf; 1739 memmove(buf, virtual, length); 1740 return (compressor_write(di->kdcomp->kdc_stream, buf, length)); 1741 } 1742 return (_dump_append(di, virtual, length)); 1743 } 1744 1745 /* 1746 * Write to the dump device at the specified offset. 1747 */ 1748 int 1749 dump_write(struct dumperinfo *di, void *virtual, off_t offset, size_t length) 1750 { 1751 int error; 1752 1753 error = dump_check_bounds(di, offset, length); 1754 if (error != 0) 1755 return (error); 1756 return (di->dumper(di->priv, virtual, offset, length)); 1757 } 1758 1759 /* 1760 * Perform kernel dump finalization: flush the compression stream, if necessary, 1761 * write the leading and trailing kernel dump headers now that we know the true 1762 * length of the dump, and optionally write the encryption key following the 1763 * leading header. 1764 */ 1765 int 1766 dump_finish(struct dumperinfo *di, struct kerneldumpheader *kdh) 1767 { 1768 int error; 1769 1770 if (di->kdcomp != NULL) { 1771 error = compressor_flush(di->kdcomp->kdc_stream); 1772 if (error == EAGAIN) { 1773 /* We have residual data in di->blockbuf. */ 1774 error = _dump_append(di, di->blockbuf, di->blocksize); 1775 if (error == 0) 1776 /* Compensate for _dump_append()'s adjustment. */ 1777 di->dumpoff -= di->blocksize - di->kdcomp->kdc_resid; 1778 di->kdcomp->kdc_resid = 0; 1779 } 1780 if (error != 0) 1781 return (error); 1782 1783 /* 1784 * We now know the size of the compressed dump, so update the 1785 * header accordingly and recompute parity. 1786 */ 1787 kdh->dumplength = htod64(di->dumpoff - di->origdumpoff); 1788 kdh->parity = 0; 1789 kdh->parity = kerneldump_parity(kdh); 1790 1791 compressor_reset(di->kdcomp->kdc_stream); 1792 } 1793 1794 error = dump_write_headers(di, kdh); 1795 if (error != 0) 1796 return (error); 1797 1798 (void)dump_write(di, NULL, 0, 0); 1799 return (0); 1800 } 1801 1802 void 1803 dump_init_header(const struct dumperinfo *di, struct kerneldumpheader *kdh, 1804 const char *magic, uint32_t archver, uint64_t dumplen) 1805 { 1806 size_t dstsize; 1807 1808 bzero(kdh, sizeof(*kdh)); 1809 strlcpy(kdh->magic, magic, sizeof(kdh->magic)); 1810 strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 1811 kdh->version = htod32(KERNELDUMPVERSION); 1812 kdh->architectureversion = htod32(archver); 1813 kdh->dumplength = htod64(dumplen); 1814 kdh->dumpextent = kdh->dumplength; 1815 kdh->dumptime = htod64(time_second); 1816 #ifdef EKCD 1817 kdh->dumpkeysize = htod32(kerneldumpcrypto_dumpkeysize(di->kdcrypto)); 1818 #else 1819 kdh->dumpkeysize = 0; 1820 #endif 1821 kdh->blocksize = htod32(di->blocksize); 1822 strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 1823 dstsize = sizeof(kdh->versionstring); 1824 if (strlcpy(kdh->versionstring, version, dstsize) >= dstsize) 1825 kdh->versionstring[dstsize - 2] = '\n'; 1826 if (panicstr != NULL) 1827 strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 1828 if (di->kdcomp != NULL) 1829 kdh->compression = di->kdcomp->kdc_format; 1830 kdh->parity = kerneldump_parity(kdh); 1831 } 1832 1833 #ifdef DDB 1834 DB_SHOW_COMMAND_FLAGS(panic, db_show_panic, DB_CMD_MEMSAFE) 1835 { 1836 1837 if (panicstr == NULL) 1838 db_printf("panicstr not set\n"); 1839 else 1840 db_printf("panic: %s\n", panicstr); 1841 } 1842 #endif 1843