2127f26023
for possible buffer overflow problems. Replaced most sprintf()'s with snprintf(); for others cases, added terminating NUL bytes where appropriate, replaced constants like "16" with sizeof(), etc. These changes include several bug fixes, but most changes are for maintainability's sake. Any instance where it wasn't "immediately obvious" that a buffer overflow could not occur was made safer. Reviewed by: Bruce Evans <bde@zeta.org.au> Reviewed by: Matthew Dillon <dillon@apollo.backplane.com> Reviewed by: Mike Spengler <mks@networkcs.com>
531 lines
13 KiB
C
531 lines
13 KiB
C
/*-
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* Copyright (c) 1986, 1988, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
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* $Id: kern_shutdown.c,v 1.42 1998/11/13 22:40:37 msmith Exp $
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*/
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#include "opt_ddb.h"
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#include "opt_hw_wdog.h"
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#include "opt_panic.h"
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#include "opt_show_busybufs.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/reboot.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/conf.h>
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#include <sys/sysproto.h>
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|
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|
#include <machine/pcb.h>
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#include <machine/clock.h>
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#include <machine/cons.h>
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#include <machine/md_var.h>
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#ifdef SMP
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#include <machine/smp.h> /* smp_active, cpuid */
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#endif
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#include <sys/signalvar.h>
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#ifndef PANIC_REBOOT_WAIT_TIME
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#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
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#endif
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|
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/*
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* Note that stdarg.h and the ANSI style va_start macro is used for both
|
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* ANSI and traditional C compilers.
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*/
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#include <machine/stdarg.h>
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|
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#ifdef DDB
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#ifdef DDB_UNATTENDED
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static int debugger_on_panic = 0;
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#else
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static int debugger_on_panic = 1;
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|
#endif
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SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
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&debugger_on_panic, 0, "");
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#endif
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|
#ifdef HW_WDOG
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/*
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* If there is a hardware watchdog, point this at the function needed to
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* hold it off.
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* It's needed when the kernel needs to do some lengthy operations.
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* e.g. in wd.c when dumping core.. It's most annoying to have
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* your precious core-dump only half written because the wdog kicked in.
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*/
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watchdog_tickle_fn wdog_tickler = NULL;
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#endif /* HW_WDOG */
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|
|
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/*
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* Variable panicstr contains argument to first call to panic; used as flag
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* to indicate that the kernel has already called panic.
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*/
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const char *panicstr;
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|
|
/*
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* callout list for things to do a shutdown
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*/
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typedef struct shutdown_list_element {
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LIST_ENTRY(shutdown_list_element) links;
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bootlist_fn function;
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void *arg;
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int priority;
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} *sle_p;
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|
|
|
/*
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* There are three shutdown lists. Some things need to be shut down
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* earlier than others.
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*/
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LIST_HEAD(shutdown_list, shutdown_list_element);
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static struct shutdown_list shutdown_lists[SHUTDOWN_FINAL + 1];
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static void boot __P((int)) __dead2;
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static void dumpsys __P((void));
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#ifndef _SYS_SYSPROTO_H_
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struct reboot_args {
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int opt;
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};
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#endif
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/* ARGSUSED */
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/*
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* The system call that results in a reboot
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*/
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int
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reboot(p, uap)
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struct proc *p;
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struct reboot_args *uap;
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{
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int error;
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if ((error = suser(p->p_ucred, &p->p_acflag)))
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return (error);
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boot(uap->opt);
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return (0);
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}
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/*
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* Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
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*/
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void
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shutdown_nice()
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{
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/* Send a signal to init(8) and have it shutdown the world */
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if (initproc != NULL) {
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psignal(initproc, SIGINT);
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} else {
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/* No init(8) running, so simply reboot */
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boot(RB_NOSYNC);
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}
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return;
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}
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static int waittime = -1;
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static struct pcb dumppcb;
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/*
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* Go through the rigmarole of shutting down..
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* this used to be in machdep.c but I'll be dammned if I could see
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* anything machine dependant in it.
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*/
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static void
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boot(howto)
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int howto;
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{
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sle_p ep;
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#ifdef SMP
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if (smp_active) {
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printf("boot() called on cpu#%d\n", cpuid);
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}
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#endif
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/*
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* Do any callouts that should be done BEFORE syncing the filesystems.
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*/
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LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_PRE_SYNC], links)
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(*ep->function)(howto, ep->arg);
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/*
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* Now sync filesystems
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*/
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if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
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register struct buf *bp;
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int iter, nbusy;
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waittime = 0;
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printf("\nsyncing disks... ");
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sync(&proc0, NULL);
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/*
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* With soft updates, some buffers that are
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* written will be remarked as dirty until other
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* buffers are written.
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*/
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for (iter = 0; iter < 20; iter++) {
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if ((bp->b_flags & (B_BUSY | B_INVAL))
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== B_BUSY) {
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nbusy++;
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} else if ((bp->b_flags & (B_DELWRI | B_INVAL))
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== B_DELWRI) {
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/* bawrite(bp);*/
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nbusy++;
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}
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}
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if (nbusy == 0)
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break;
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printf("%d ", nbusy);
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sync(&proc0, NULL);
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DELAY(50000 * iter);
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}
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/*
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* Count only busy local buffers to prevent forcing
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* a fsck if we're just a client of a wedged NFS server
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*/
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if (((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY)
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||((bp->b_flags & (B_DELWRI | B_INVAL))== B_DELWRI))
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if(bp->b_dev == NODEV)
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CIRCLEQ_REMOVE(&mountlist, bp->b_vp->v_mount, mnt_list);
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else
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nbusy++;
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}
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if (nbusy) {
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/*
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* Failed to sync all blocks. Indicate this and don't
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* unmount filesystems (thus forcing an fsck on reboot).
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*/
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printf("giving up\n");
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#ifdef SHOW_BUSYBUFS
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if ((bp->b_flags & (B_BUSY | B_INVAL))
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== B_BUSY) {
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nbusy++;
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printf(
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"%d: dev:%08lx, flags:%08lx, blkno:%ld, lblkno:%ld\n",
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nbusy, (u_long)bp->b_dev,
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bp->b_flags, (long)bp->b_blkno,
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(long)bp->b_lblkno);
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}
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}
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DELAY(5000000); /* 5 seconds */
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#endif
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} else {
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printf("done\n");
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/*
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* Unmount filesystems
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*/
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if (panicstr == 0)
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vfs_unmountall();
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}
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DELAY(100000); /* wait for console output to finish */
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}
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/*
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* Ok, now do things that assume all filesystem activity has
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* been completed.
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*/
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LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_POST_SYNC], links)
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(*ep->function)(howto, ep->arg);
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splhigh();
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|
if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) {
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savectx(&dumppcb);
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#ifdef __i386__
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dumppcb.pcb_cr3 = rcr3();
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#endif
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dumpsys();
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}
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|
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/* Now that we're going to really halt the system... */
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LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_FINAL], links)
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(*ep->function)(howto, ep->arg);
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if (howto & RB_HALT) {
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printf("\n");
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printf("The operating system has halted.\n");
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|
printf("Please press any key to reboot.\n\n");
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switch (cngetc()) {
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case -1: /* No console, just die */
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cpu_halt();
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/* NOTREACHED */
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default:
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howto &= ~RB_HALT;
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break;
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}
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} else if (howto & RB_DUMP) {
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/* System Paniced */
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|
|
|
if (PANIC_REBOOT_WAIT_TIME != 0) {
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if (PANIC_REBOOT_WAIT_TIME != -1) {
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int loop;
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printf("Automatic reboot in %d seconds - "
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"press a key on the console to abort\n",
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PANIC_REBOOT_WAIT_TIME);
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for (loop = PANIC_REBOOT_WAIT_TIME * 10;
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loop > 0; --loop) {
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DELAY(1000 * 100); /* 1/10th second */
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/* Did user type a key? */
|
|
if (cncheckc() != -1)
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break;
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}
|
|
if (!loop)
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goto die;
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|
}
|
|
} else { /* zero time specified - reboot NOW */
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|
goto die;
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|
}
|
|
printf("--> Press a key on the console to reboot <--\n");
|
|
cngetc();
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|
}
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|
die:
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|
printf("Rebooting...\n");
|
|
DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
|
|
/* cpu_boot(howto); */ /* doesn't do anything at the moment */
|
|
cpu_reset();
|
|
for(;;) ;
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Magic number for savecore
|
|
*
|
|
* exported (symorder) and used at least by savecore(8)
|
|
*
|
|
*/
|
|
static u_long const dumpmag = 0x8fca0101UL;
|
|
|
|
static int dumpsize = 0; /* also for savecore */
|
|
|
|
static int dodump = 1;
|
|
SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, "");
|
|
|
|
/* ARGSUSED */
|
|
static void dump_conf __P((void *dummy));
|
|
static void
|
|
dump_conf(dummy)
|
|
void *dummy;
|
|
{
|
|
cpu_dumpconf();
|
|
}
|
|
SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
|
|
|
|
/*
|
|
* Doadump comes here after turning off memory management and
|
|
* getting on the dump stack, either when called above, or by
|
|
* the auto-restart code.
|
|
*/
|
|
static void
|
|
dumpsys(void)
|
|
{
|
|
|
|
if (!dodump)
|
|
return;
|
|
if (dumpdev == NODEV)
|
|
return;
|
|
if (!(bdevsw[major(dumpdev)]))
|
|
return;
|
|
if (!(bdevsw[major(dumpdev)]->d_dump))
|
|
return;
|
|
dumpsize = Maxmem;
|
|
printf("\ndumping to dev %lx, offset %ld\n", (u_long)dumpdev, dumplo);
|
|
printf("dump ");
|
|
switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) {
|
|
|
|
case ENXIO:
|
|
printf("device bad\n");
|
|
break;
|
|
|
|
case EFAULT:
|
|
printf("device not ready\n");
|
|
break;
|
|
|
|
case EINVAL:
|
|
printf("area improper\n");
|
|
break;
|
|
|
|
case EIO:
|
|
printf("i/o error\n");
|
|
break;
|
|
|
|
case EINTR:
|
|
printf("aborted from console\n");
|
|
break;
|
|
|
|
default:
|
|
printf("succeeded\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Panic is called on unresolvable fatal errors. It prints "panic: mesg",
|
|
* and then reboots. If we are called twice, then we avoid trying to sync
|
|
* the disks as this often leads to recursive panics.
|
|
*/
|
|
void
|
|
panic(const char *fmt, ...)
|
|
{
|
|
int bootopt;
|
|
va_list ap;
|
|
static char buf[256];
|
|
|
|
bootopt = RB_AUTOBOOT | RB_DUMP;
|
|
if (panicstr)
|
|
bootopt |= RB_NOSYNC;
|
|
else
|
|
panicstr = fmt;
|
|
|
|
va_start(ap, fmt);
|
|
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
if (panicstr == fmt)
|
|
panicstr = buf;
|
|
va_end(ap);
|
|
printf("panic: %s\n", buf);
|
|
#ifdef SMP
|
|
/* three seperate prints in case of an unmapped page and trap */
|
|
printf("mp_lock = %08x; ", mp_lock);
|
|
printf("cpuid = %d; ", cpuid);
|
|
printf("lapic.id = %08x\n", lapic.id);
|
|
#endif
|
|
|
|
#if defined(DDB)
|
|
if (debugger_on_panic)
|
|
Debugger ("panic");
|
|
#endif
|
|
boot(bootopt);
|
|
}
|
|
|
|
/*
|
|
* Three routines to handle adding/deleting items on the
|
|
* shutdown callout lists
|
|
*
|
|
* at_shutdown():
|
|
* Take the arguments given and put them onto the shutdown callout list.
|
|
* However first make sure that it's not already there.
|
|
* returns 0 on success.
|
|
*/
|
|
int
|
|
at_shutdown(bootlist_fn function, void *arg, int queue)
|
|
{
|
|
return(at_shutdown_pri(function, arg, queue, SHUTDOWN_PRI_DEFAULT));
|
|
}
|
|
|
|
/*
|
|
* at_shutdown_pri():
|
|
* Take the arguments given and put them onto the shutdown callout list
|
|
* with the given execution priority.
|
|
* returns 0 on success.
|
|
*/
|
|
int
|
|
at_shutdown_pri(bootlist_fn function, void *arg, int queue, int pri)
|
|
{
|
|
sle_p ep, ip;
|
|
|
|
if (queue < SHUTDOWN_PRE_SYNC
|
|
|| queue > SHUTDOWN_FINAL) {
|
|
printf("at_shutdown: bad exit callout queue %d specified\n",
|
|
queue);
|
|
return (EINVAL);
|
|
}
|
|
if (rm_at_shutdown(function, arg))
|
|
printf("at_shutdown: exit callout entry was already present\n");
|
|
ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT);
|
|
if (ep == NULL)
|
|
return (ENOMEM);
|
|
ep->function = function;
|
|
ep->arg = arg;
|
|
ep->priority = pri;
|
|
|
|
/* Sort into list of items on this queue */
|
|
ip = LIST_FIRST(&shutdown_lists[queue]);
|
|
if (ip == NULL) {
|
|
LIST_INSERT_HEAD(&shutdown_lists[queue], ep, links);
|
|
} else {
|
|
for (; LIST_NEXT(ip, links) != NULL; ip = LIST_NEXT(ip, links)) {
|
|
if (ep->priority < ip->priority) {
|
|
LIST_INSERT_BEFORE(ip, ep, links);
|
|
ep = NULL;
|
|
break;
|
|
}
|
|
}
|
|
if (ep != NULL)
|
|
LIST_INSERT_AFTER(ip, ep, links);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Scan the exit callout lists for the given items and remove them.
|
|
* Returns the number of items removed.
|
|
*/
|
|
int
|
|
rm_at_shutdown(bootlist_fn function, void *arg)
|
|
{
|
|
sle_p ep;
|
|
int count;
|
|
int queue;
|
|
|
|
count = 0;
|
|
for (queue = SHUTDOWN_PRE_SYNC; queue < SHUTDOWN_FINAL; queue++) {
|
|
LIST_FOREACH(ep, &shutdown_lists[queue], links) {
|
|
if ((ep->function == function) && (ep->arg == arg)) {
|
|
LIST_REMOVE(ep, links);
|
|
free(ep, M_TEMP);
|
|
count++;
|
|
}
|
|
}
|
|
}
|
|
return (count);
|
|
}
|