1 /*-
2 * Copyright (c) 1986, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/9.2/sys/kern/kern_shutdown.c 248085 2013-03-09 02:36:32Z marius $");
39
40 #include "opt_ddb.h"
41 #include "opt_kdb.h"
42 #include "opt_panic.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/buf.h>
50 #include <sys/conf.h>
51 #include <sys/cons.h>
52 #include <sys/eventhandler.h>
53 #include <sys/jail.h>
54 #include <sys/kdb.h>
55 #include <sys/kernel.h>
56 #include <sys/kerneldump.h>
57 #include <sys/kthread.h>
58 #include <sys/malloc.h>
59 #include <sys/mount.h>
60 #include <sys/priv.h>
61 #include <sys/proc.h>
62 #include <sys/reboot.h>
63 #include <sys/resourcevar.h>
64 #include <sys/sched.h>
65 #include <sys/smp.h>
66 #include <sys/sysctl.h>
67 #include <sys/sysproto.h>
68 #include <sys/vnode.h>
69 #include <sys/watchdog.h>
70
71 #include <ddb/ddb.h>
72
73 #include <machine/cpu.h>
74 #include <machine/pcb.h>
75 #include <machine/smp.h>
76
77 #include <security/mac/mac_framework.h>
78
79 #include <vm/vm.h>
80 #include <vm/vm_object.h>
81 #include <vm/vm_page.h>
82 #include <vm/vm_pager.h>
83 #include <vm/swap_pager.h>
84
85 #include <sys/signalvar.h>
86
87 #ifndef PANIC_REBOOT_WAIT_TIME
88 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
89 #endif
90
91 /*
92 * Note that stdarg.h and the ANSI style va_start macro is used for both
93 * ANSI and traditional C compilers.
94 */
95 #include <machine/stdarg.h>
96
97 #ifdef KDB
98 #ifdef KDB_UNATTENDED
99 int debugger_on_panic = 0;
100 #else
101 int debugger_on_panic = 1;
102 #endif
103 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic,
104 CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN,
105 &debugger_on_panic, 0, "Run debugger on kernel panic");
106 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic);
107
108 #ifdef KDB_TRACE
109 static int trace_on_panic = 1;
110 #else
111 static int trace_on_panic = 0;
112 #endif
113 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic,
114 CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN,
115 &trace_on_panic, 0, "Print stack trace on kernel panic");
116 TUNABLE_INT("debug.trace_on_panic", &trace_on_panic);
117 #endif /* KDB */
118
119 static int sync_on_panic = 0;
120 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
121 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
122 TUNABLE_INT("kern.sync_on_panic", &sync_on_panic);
123
124 static int stop_scheduler_on_panic = 1;
125 SYSCTL_INT(_kern, OID_AUTO, stop_scheduler_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
126 &stop_scheduler_on_panic, 0, "stop scheduler upon entering panic");
127 TUNABLE_INT("kern.stop_scheduler_on_panic", &stop_scheduler_on_panic);
128
129 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0,
130 "Shutdown environment");
131
132 #ifndef DIAGNOSTIC
133 static int show_busybufs;
134 #else
135 static int show_busybufs = 1;
136 #endif
137 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW,
138 &show_busybufs, 0, "");
139
140 /*
141 * Variable panicstr contains argument to first call to panic; used as flag
142 * to indicate that the kernel has already called panic.
143 */
144 const char *panicstr;
145
146 int dumping; /* system is dumping */
147 int rebooting; /* system is rebooting */
148 static struct dumperinfo dumper; /* our selected dumper */
149
150 /* Context information for dump-debuggers. */
151 static struct pcb dumppcb; /* Registers. */
152 lwpid_t dumptid; /* Thread ID. */
153
154 static void poweroff_wait(void *, int);
155 static void shutdown_halt(void *junk, int howto);
156 static void shutdown_panic(void *junk, int howto);
157 static void shutdown_reset(void *junk, int howto);
158
159 /* register various local shutdown events */
160 static void
161 shutdown_conf(void *unused)
162 {
163
164 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
165 SHUTDOWN_PRI_FIRST);
166 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
167 SHUTDOWN_PRI_LAST + 100);
168 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
169 SHUTDOWN_PRI_LAST + 100);
170 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
171 SHUTDOWN_PRI_LAST + 200);
172 }
173
174 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
175
176 /*
177 * The system call that results in a reboot.
178 */
179 /* ARGSUSED */
180 int
181 sys_reboot(struct thread *td, struct reboot_args *uap)
182 {
183 int error;
184
185 error = 0;
186 #ifdef MAC
187 error = mac_system_check_reboot(td->td_ucred, uap->opt);
188 #endif
189 if (error == 0)
190 error = priv_check(td, PRIV_REBOOT);
191 if (error == 0) {
192 mtx_lock(&Giant);
193 kern_reboot(uap->opt);
194 mtx_unlock(&Giant);
195 }
196 return (error);
197 }
198
199 /*
200 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
201 */
202 static int shutdown_howto = 0;
203
204 void
205 shutdown_nice(int howto)
206 {
207
208 shutdown_howto = howto;
209
210 /* Send a signal to init(8) and have it shutdown the world */
211 if (initproc != NULL) {
212 PROC_LOCK(initproc);
213 kern_psignal(initproc, SIGINT);
214 PROC_UNLOCK(initproc);
215 } else {
216 /* No init(8) running, so simply reboot */
217 kern_reboot(RB_NOSYNC);
218 }
219 return;
220 }
221 static int waittime = -1;
222
223 static void
224 print_uptime(void)
225 {
226 int f;
227 struct timespec ts;
228
229 getnanouptime(&ts);
230 printf("Uptime: ");
231 f = 0;
232 if (ts.tv_sec >= 86400) {
233 printf("%ldd", (long)ts.tv_sec / 86400);
234 ts.tv_sec %= 86400;
235 f = 1;
236 }
237 if (f || ts.tv_sec >= 3600) {
238 printf("%ldh", (long)ts.tv_sec / 3600);
239 ts.tv_sec %= 3600;
240 f = 1;
241 }
242 if (f || ts.tv_sec >= 60) {
243 printf("%ldm", (long)ts.tv_sec / 60);
244 ts.tv_sec %= 60;
245 f = 1;
246 }
247 printf("%lds\n", (long)ts.tv_sec);
248 }
249
250 int
251 doadump(boolean_t textdump)
252 {
253 boolean_t coredump;
254
255 if (dumping)
256 return (EBUSY);
257 if (dumper.dumper == NULL)
258 return (ENXIO);
259
260 savectx(&dumppcb);
261 dumptid = curthread->td_tid;
262 dumping++;
263
264 coredump = TRUE;
265 #ifdef DDB
266 if (textdump && textdump_pending) {
267 coredump = FALSE;
268 textdump_dumpsys(&dumper);
269 }
270 #endif
271 if (coredump)
272 dumpsys(&dumper);
273
274 dumping--;
275 return (0);
276 }
277
278 static int
279 isbufbusy(struct buf *bp)
280 {
281 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
282 BUF_ISLOCKED(bp)) ||
283 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
284 return (1);
285 return (0);
286 }
287
288 /*
289 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
290 */
291 void
292 kern_reboot(int howto)
293 {
294 static int first_buf_printf = 1;
295
296 #if defined(SMP)
297 /*
298 * Bind us to CPU 0 so that all shutdown code runs there. Some
299 * systems don't shutdown properly (i.e., ACPI power off) if we
300 * run on another processor.
301 */
302 if (!SCHEDULER_STOPPED()) {
303 thread_lock(curthread);
304 sched_bind(curthread, 0);
305 thread_unlock(curthread);
306 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
307 }
308 #endif
309 /* We're in the process of rebooting. */
310 rebooting = 1;
311
312 /* collect extra flags that shutdown_nice might have set */
313 howto |= shutdown_howto;
314
315 /* We are out of the debugger now. */
316 kdb_active = 0;
317
318 /*
319 * Do any callouts that should be done BEFORE syncing the filesystems.
320 */
321 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
322
323 /*
324 * Now sync filesystems
325 */
326 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
327 register struct buf *bp;
328 int iter, nbusy, pbusy;
329 #ifndef PREEMPTION
330 int subiter;
331 #endif
332
333 waittime = 0;
334
335 wdog_kern_pat(WD_LASTVAL);
336 sys_sync(curthread, NULL);
337
338 /*
339 * With soft updates, some buffers that are
340 * written will be remarked as dirty until other
341 * buffers are written.
342 */
343 for (iter = pbusy = 0; iter < 20; iter++) {
344 nbusy = 0;
345 for (bp = &buf[nbuf]; --bp >= buf; )
346 if (isbufbusy(bp))
347 nbusy++;
348 if (nbusy == 0) {
349 if (first_buf_printf)
350 printf("All buffers synced.");
351 break;
352 }
353 if (first_buf_printf) {
354 printf("Syncing disks, buffers remaining... ");
355 first_buf_printf = 0;
356 }
357 printf("%d ", nbusy);
358 if (nbusy < pbusy)
359 iter = 0;
360 pbusy = nbusy;
361
362 wdog_kern_pat(WD_LASTVAL);
363 sys_sync(curthread, NULL);
364
365 #ifdef PREEMPTION
366 /*
367 * Drop Giant and spin for a while to allow
368 * interrupt threads to run.
369 */
370 DROP_GIANT();
371 DELAY(50000 * iter);
372 PICKUP_GIANT();
373 #else
374 /*
375 * Drop Giant and context switch several times to
376 * allow interrupt threads to run.
377 */
378 DROP_GIANT();
379 for (subiter = 0; subiter < 50 * iter; subiter++) {
380 thread_lock(curthread);
381 mi_switch(SW_VOL, NULL);
382 thread_unlock(curthread);
383 DELAY(1000);
384 }
385 PICKUP_GIANT();
386 #endif
387 }
388 printf("\n");
389 /*
390 * Count only busy local buffers to prevent forcing
391 * a fsck if we're just a client of a wedged NFS server
392 */
393 nbusy = 0;
394 for (bp = &buf[nbuf]; --bp >= buf; ) {
395 if (isbufbusy(bp)) {
396 #if 0
397 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
398 if (bp->b_dev == NULL) {
399 TAILQ_REMOVE(&mountlist,
400 bp->b_vp->v_mount, mnt_list);
401 continue;
402 }
403 #endif
404 nbusy++;
405 if (show_busybufs > 0) {
406 printf(
407 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:",
408 nbusy, bp, bp->b_vp, bp->b_flags,
409 (intmax_t)bp->b_blkno,
410 (intmax_t)bp->b_lblkno);
411 BUF_LOCKPRINTINFO(bp);
412 if (show_busybufs > 1)
413 vn_printf(bp->b_vp,
414 "vnode content: ");
415 }
416 }
417 }
418 if (nbusy) {
419 /*
420 * Failed to sync all blocks. Indicate this and don't
421 * unmount filesystems (thus forcing an fsck on reboot).
422 */
423 printf("Giving up on %d buffers\n", nbusy);
424 DELAY(5000000); /* 5 seconds */
425 } else {
426 if (!first_buf_printf)
427 printf("Final sync complete\n");
428 /*
429 * Unmount filesystems
430 */
431 if (panicstr == 0)
432 vfs_unmountall();
433 }
434 swapoff_all();
435 DELAY(100000); /* wait for console output to finish */
436 }
437
438 print_uptime();
439
440 cngrab();
441
442 /*
443 * Ok, now do things that assume all filesystem activity has
444 * been completed.
445 */
446 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
447
448 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
449 doadump(TRUE);
450
451 /* Now that we're going to really halt the system... */
452 EVENTHANDLER_INVOKE(shutdown_final, howto);
453
454 for(;;) ; /* safety against shutdown_reset not working */
455 /* NOTREACHED */
456 }
457
458 /*
459 * If the shutdown was a clean halt, behave accordingly.
460 */
461 static void
462 shutdown_halt(void *junk, int howto)
463 {
464
465 if (howto & RB_HALT) {
466 printf("\n");
467 printf("The operating system has halted.\n");
468 printf("Please press any key to reboot.\n\n");
469 switch (cngetc()) {
470 case -1: /* No console, just die */
471 cpu_halt();
472 /* NOTREACHED */
473 default:
474 howto &= ~RB_HALT;
475 break;
476 }
477 }
478 }
479
480 /*
481 * Check to see if the system paniced, pause and then reboot
482 * according to the specified delay.
483 */
484 static void
485 shutdown_panic(void *junk, int howto)
486 {
487 int loop;
488
489 if (howto & RB_DUMP) {
490 if (PANIC_REBOOT_WAIT_TIME != 0) {
491 if (PANIC_REBOOT_WAIT_TIME != -1) {
492 printf("Automatic reboot in %d seconds - "
493 "press a key on the console to abort\n",
494 PANIC_REBOOT_WAIT_TIME);
495 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
496 loop > 0; --loop) {
497 DELAY(1000 * 100); /* 1/10th second */
498 /* Did user type a key? */
499 if (cncheckc() != -1)
500 break;
501 }
502 if (!loop)
503 return;
504 }
505 } else { /* zero time specified - reboot NOW */
506 return;
507 }
508 printf("--> Press a key on the console to reboot,\n");
509 printf("--> or switch off the system now.\n");
510 cngetc();
511 }
512 }
513
514 /*
515 * Everything done, now reset
516 */
517 static void
518 shutdown_reset(void *junk, int howto)
519 {
520
521 printf("Rebooting...\n");
522 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
523
524 /*
525 * Acquiring smp_ipi_mtx here has a double effect:
526 * - it disables interrupts avoiding CPU0 preemption
527 * by fast handlers (thus deadlocking against other CPUs)
528 * - it avoids deadlocks against smp_rendezvous() or, more
529 * generally, threads busy-waiting, with this spinlock held,
530 * and waiting for responses by threads on other CPUs
531 * (ie. smp_tlb_shootdown()).
532 *
533 * For the !SMP case it just needs to handle the former problem.
534 */
535 #ifdef SMP
536 mtx_lock_spin(&smp_ipi_mtx);
537 #else
538 spinlock_enter();
539 #endif
540
541 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
542 cpu_reset();
543 /* NOTREACHED */ /* assuming reset worked */
544 }
545
546 /*
547 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
548 * and then reboots. If we are called twice, then we avoid trying to sync
549 * the disks as this often leads to recursive panics.
550 */
551 void
552 panic(const char *fmt, ...)
553 {
554 #ifdef SMP
555 static volatile u_int panic_cpu = NOCPU;
556 cpuset_t other_cpus;
557 #endif
558 struct thread *td = curthread;
559 int bootopt, newpanic;
560 va_list ap;
561 static char buf[256];
562
563 if (stop_scheduler_on_panic)
564 spinlock_enter();
565 else
566 critical_enter();
567
568 #ifdef SMP
569 /*
570 * We don't want multiple CPU's to panic at the same time, so we
571 * use panic_cpu as a simple spinlock. We have to keep checking
572 * panic_cpu if we are spinning in case the panic on the first
573 * CPU is canceled.
574 */
575 if (panic_cpu != PCPU_GET(cpuid))
576 while (atomic_cmpset_int(&panic_cpu, NOCPU,
577 PCPU_GET(cpuid)) == 0)
578 while (panic_cpu != NOCPU)
579 ; /* nothing */
580
581 if (stop_scheduler_on_panic) {
582 if (panicstr == NULL && !kdb_active) {
583 other_cpus = all_cpus;
584 CPU_CLR(PCPU_GET(cpuid), &other_cpus);
585 stop_cpus_hard(other_cpus);
586 }
587
588 /*
589 * We set stop_scheduler here and not in the block above,
590 * because we want to ensure that if panic has been called and
591 * stop_scheduler_on_panic is true, then stop_scheduler will
592 * always be set. Even if panic has been entered from kdb.
593 */
594 td->td_stopsched = 1;
595 }
596 #endif
597
598 bootopt = RB_AUTOBOOT;
599 newpanic = 0;
600 if (panicstr)
601 bootopt |= RB_NOSYNC;
602 else {
603 bootopt |= RB_DUMP;
604 panicstr = fmt;
605 newpanic = 1;
606 }
607
608 va_start(ap, fmt);
609 if (newpanic) {
610 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
611 panicstr = buf;
612 cngrab();
613 printf("panic: %s\n", buf);
614 } else {
615 printf("panic: ");
616 vprintf(fmt, ap);
617 printf("\n");
618 }
619 va_end(ap);
620 #ifdef SMP
621 printf("cpuid = %d\n", PCPU_GET(cpuid));
622 #endif
623
624 #ifdef KDB
625 if (newpanic && trace_on_panic)
626 kdb_backtrace();
627 if (debugger_on_panic)
628 kdb_enter(KDB_WHY_PANIC, "panic");
629 #endif
630 /*thread_lock(td); */
631 td->td_flags |= TDF_INPANIC;
632 /* thread_unlock(td); */
633 if (!sync_on_panic)
634 bootopt |= RB_NOSYNC;
635 if (!stop_scheduler_on_panic)
636 critical_exit();
637 kern_reboot(bootopt);
638 }
639
640 /*
641 * Support for poweroff delay.
642 *
643 * Please note that setting this delay too short might power off your machine
644 * before the write cache on your hard disk has been flushed, leading to
645 * soft-updates inconsistencies.
646 */
647 #ifndef POWEROFF_DELAY
648 # define POWEROFF_DELAY 5000
649 #endif
650 static int poweroff_delay = POWEROFF_DELAY;
651
652 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
653 &poweroff_delay, 0, "");
654
655 static void
656 poweroff_wait(void *junk, int howto)
657 {
658
659 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
660 return;
661 DELAY(poweroff_delay * 1000);
662 }
663
664 /*
665 * Some system processes (e.g. syncer) need to be stopped at appropriate
666 * points in their main loops prior to a system shutdown, so that they
667 * won't interfere with the shutdown process (e.g. by holding a disk buf
668 * to cause sync to fail). For each of these system processes, register
669 * shutdown_kproc() as a handler for one of shutdown events.
670 */
671 static int kproc_shutdown_wait = 60;
672 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
673 &kproc_shutdown_wait, 0, "");
674
675 void
676 kproc_shutdown(void *arg, int howto)
677 {
678 struct proc *p;
679 int error;
680
681 if (panicstr)
682 return;
683
684 p = (struct proc *)arg;
685 printf("Waiting (max %d seconds) for system process `%s' to stop...",
686 kproc_shutdown_wait, p->p_comm);
687 error = kproc_suspend(p, kproc_shutdown_wait * hz);
688
689 if (error == EWOULDBLOCK)
690 printf("timed out\n");
691 else
692 printf("done\n");
693 }
694
695 void
696 kthread_shutdown(void *arg, int howto)
697 {
698 struct thread *td;
699 int error;
700
701 if (panicstr)
702 return;
703
704 td = (struct thread *)arg;
705 printf("Waiting (max %d seconds) for system thread `%s' to stop...",
706 kproc_shutdown_wait, td->td_name);
707 error = kthread_suspend(td, kproc_shutdown_wait * hz);
708
709 if (error == EWOULDBLOCK)
710 printf("timed out\n");
711 else
712 printf("done\n");
713 }
714
715 /* Registration of dumpers */
716 int
717 set_dumper(struct dumperinfo *di)
718 {
719
720 if (di == NULL) {
721 bzero(&dumper, sizeof dumper);
722 return (0);
723 }
724 if (dumper.dumper != NULL)
725 return (EBUSY);
726 dumper = *di;
727 return (0);
728 }
729
730 /* Call dumper with bounds checking. */
731 int
732 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
733 off_t offset, size_t length)
734 {
735
736 if (length != 0 && (offset < di->mediaoffset ||
737 offset - di->mediaoffset + length > di->mediasize)) {
738 printf("Attempt to write outside dump device boundaries.\n"
739 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
740 (intmax_t)offset, (intmax_t)di->mediaoffset,
741 (uintmax_t)length, (intmax_t)di->mediasize);
742 return (ENOSPC);
743 }
744 return (di->dumper(di->priv, virtual, physical, offset, length));
745 }
746
747 void
748 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
749 uint64_t dumplen, uint32_t blksz)
750 {
751
752 bzero(kdh, sizeof(*kdh));
753 strncpy(kdh->magic, magic, sizeof(kdh->magic));
754 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
755 kdh->version = htod32(KERNELDUMPVERSION);
756 kdh->architectureversion = htod32(archver);
757 kdh->dumplength = htod64(dumplen);
758 kdh->dumptime = htod64(time_second);
759 kdh->blocksize = htod32(blksz);
760 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
761 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
762 if (panicstr != NULL)
763 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
764 kdh->parity = kerneldump_parity(kdh);
765 }
Cache object: 8122f6295248b436daacb39d65b11e1d
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