When using a kernel built with the GZIO config option, dumpon -z can be used to configure gzip compression using the in-kernel copy of zlib. This is useful on systems with large amounts of RAM, which require a correspondingly large dump device. Recovery of compressed dumps is also faster since fewer bytes need to be copied from the dump device. Because we have no way of knowing the final size of a compressed dump until it is written, the kernel will always attempt to dump when compression is configured, regardless of the dump device size. If the dump is aborted because we run out of space, an error is reported on the console. savecore(8) is modified to handle compressed dumps and save them to vmcore.<index>.gz, as it does when given the -z option. A new rc.conf variable, dumpon_flags, is added. Its value is added to the boot-time dumpon(8) invocation that occurs when a dump device is configured in rc.conf. Reviewed by: cem (earlier version) Discussed with: def, rgrimes Relnotes: yes Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D11723
293 lines
7.2 KiB
C
293 lines
7.2 KiB
C
/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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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. 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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#if 0
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "From: @(#)swapon.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/disk.h>
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#include <sys/sysctl.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#ifdef HAVE_CRYPTO
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#include <openssl/err.h>
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#include <openssl/pem.h>
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#include <openssl/rsa.h>
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#endif
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static int verbose;
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static void
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usage(void)
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{
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fprintf(stderr, "%s\n%s\n%s\n",
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"usage: dumpon [-v] [-k public_key_file] [-z] special_file",
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" dumpon [-v] off",
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" dumpon [-v] -l");
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exit(EX_USAGE);
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}
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static void
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check_size(int fd, const char *fn)
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{
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int name[] = { CTL_HW, HW_PHYSMEM };
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size_t namelen = nitems(name);
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unsigned long physmem;
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size_t len;
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off_t mediasize;
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int minidump;
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len = sizeof(minidump);
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if (sysctlbyname("debug.minidump", &minidump, &len, NULL, 0) == 0 &&
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minidump == 1)
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return;
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len = sizeof(physmem);
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if (sysctl(name, namelen, &physmem, &len, NULL, 0) != 0)
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err(EX_OSERR, "can't get memory size");
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if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) != 0)
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err(EX_OSERR, "%s: can't get size", fn);
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if ((uintmax_t)mediasize < (uintmax_t)physmem) {
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if (verbose)
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printf("%s is smaller than physical memory\n", fn);
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exit(EX_IOERR);
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}
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}
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#ifdef HAVE_CRYPTO
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static void
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genkey(const char *pubkeyfile, struct diocskerneldump_arg *kda)
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{
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FILE *fp;
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RSA *pubkey;
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assert(pubkeyfile != NULL);
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assert(kda != NULL);
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fp = NULL;
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pubkey = NULL;
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fp = fopen(pubkeyfile, "r");
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if (fp == NULL)
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err(1, "Unable to open %s", pubkeyfile);
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if (cap_enter() < 0 && errno != ENOSYS)
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err(1, "Unable to enter capability mode");
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pubkey = RSA_new();
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if (pubkey == NULL) {
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errx(1, "Unable to allocate an RSA structure: %s",
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ERR_error_string(ERR_get_error(), NULL));
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}
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pubkey = PEM_read_RSA_PUBKEY(fp, &pubkey, NULL, NULL);
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fclose(fp);
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fp = NULL;
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if (pubkey == NULL)
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errx(1, "Unable to read data from %s.", pubkeyfile);
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kda->kda_encryptedkeysize = RSA_size(pubkey);
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if (kda->kda_encryptedkeysize > KERNELDUMP_ENCKEY_MAX_SIZE) {
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errx(1, "Public key has to be at most %db long.",
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8 * KERNELDUMP_ENCKEY_MAX_SIZE);
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}
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kda->kda_encryptedkey = calloc(1, kda->kda_encryptedkeysize);
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if (kda->kda_encryptedkey == NULL)
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err(1, "Unable to allocate encrypted key");
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kda->kda_encryption = KERNELDUMP_ENC_AES_256_CBC;
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arc4random_buf(kda->kda_key, sizeof(kda->kda_key));
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if (RSA_public_encrypt(sizeof(kda->kda_key), kda->kda_key,
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kda->kda_encryptedkey, pubkey,
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RSA_PKCS1_PADDING) != (int)kda->kda_encryptedkeysize) {
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errx(1, "Unable to encrypt the one-time key.");
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}
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RSA_free(pubkey);
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}
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#endif
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static void
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listdumpdev(void)
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{
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char dumpdev[PATH_MAX];
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size_t len;
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const char *sysctlname = "kern.shutdown.dumpdevname";
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len = sizeof(dumpdev);
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if (sysctlbyname(sysctlname, &dumpdev, &len, NULL, 0) != 0) {
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if (errno == ENOMEM) {
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err(EX_OSERR, "Kernel returned too large of a buffer for '%s'\n",
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sysctlname);
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} else {
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err(EX_OSERR, "Sysctl get '%s'\n", sysctlname);
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}
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}
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if (verbose) {
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printf("kernel dumps on ");
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}
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if (strlen(dumpdev) == 0) {
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printf("%s\n", _PATH_DEVNULL);
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} else {
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printf("%s\n", dumpdev);
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}
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}
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int
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main(int argc, char *argv[])
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{
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struct diocskerneldump_arg kda;
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const char *pubkeyfile;
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int ch;
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int i, fd;
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int do_listdumpdev = 0;
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bool enable, gzip;
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gzip = false;
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pubkeyfile = NULL;
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while ((ch = getopt(argc, argv, "k:lvz")) != -1)
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switch((char)ch) {
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case 'k':
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pubkeyfile = optarg;
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break;
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case 'l':
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do_listdumpdev = 1;
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break;
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case 'v':
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verbose = 1;
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break;
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case 'z':
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gzip = true;
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (do_listdumpdev) {
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listdumpdev();
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exit(EX_OK);
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}
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if (argc != 1)
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usage();
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enable = (strcmp(argv[0], "off") != 0);
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#ifndef HAVE_CRYPTO
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if (pubkeyfile != NULL) {
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enable = false;
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warnx("Unable to use the public key. Recompile dumpon with OpenSSL support.");
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}
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#endif
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if (enable) {
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char tmp[PATH_MAX];
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char *dumpdev;
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if (strncmp(argv[0], _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0) {
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dumpdev = argv[0];
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} else {
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i = snprintf(tmp, PATH_MAX, "%s%s", _PATH_DEV, argv[0]);
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if (i < 0) {
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err(EX_OSERR, "%s", argv[0]);
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} else if (i >= PATH_MAX) {
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errno = EINVAL;
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err(EX_DATAERR, "%s", argv[0]);
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}
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dumpdev = tmp;
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}
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fd = open(dumpdev, O_RDONLY);
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if (fd < 0)
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err(EX_OSFILE, "%s", dumpdev);
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if (!gzip)
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check_size(fd, dumpdev);
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bzero(&kda, sizeof(kda));
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kda.kda_enable = 0;
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i = ioctl(fd, DIOCSKERNELDUMP, &kda);
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explicit_bzero(&kda, sizeof(kda));
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#ifdef HAVE_CRYPTO
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if (pubkeyfile != NULL)
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genkey(pubkeyfile, &kda);
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#endif
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kda.kda_enable = 1;
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kda.kda_compression = gzip ? KERNELDUMP_COMP_GZIP :
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KERNELDUMP_COMP_NONE;
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i = ioctl(fd, DIOCSKERNELDUMP, &kda);
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explicit_bzero(kda.kda_encryptedkey, kda.kda_encryptedkeysize);
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free(kda.kda_encryptedkey);
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explicit_bzero(&kda, sizeof(kda));
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if (i == 0 && verbose)
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printf("kernel dumps on %s\n", dumpdev);
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} else {
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fd = open(_PATH_DEVNULL, O_RDONLY);
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if (fd < 0)
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err(EX_OSFILE, "%s", _PATH_DEVNULL);
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kda.kda_enable = 0;
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i = ioctl(fd, DIOCSKERNELDUMP, &kda);
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explicit_bzero(&kda, sizeof(kda));
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if (i == 0 && verbose)
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printf("kernel dumps disabled\n");
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}
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if (i < 0)
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err(EX_OSERR, "ioctl(DIOCSKERNELDUMP)");
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exit (0);
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}
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