usr.sbin/installboot/bbinfo.c

   1 /*      $NetBSD: bbinfo.c,v 1.14 2009/04/05 11:55:39 lukem Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Matt Fredette, Paul Kranenburg, and Luke Mewburn.
   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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 #if !defined(__lint)
  38 __RCSID("$NetBSD: bbinfo.c,v 1.14 2009/04/05 11:55:39 lukem Exp $");
  39 #endif  /* !__lint */
  40
  41 #include <sys/param.h>
  42 #ifndef HAVE_NBTOOL_CONFIG_H
  43 #include <sys/ioctl.h>
  44 #include <sys/dkio.h>
  45 #include <errno.h>
  46 #endif
  47
  48 #include <assert.h>
  49 #include <err.h>
  50 #include <stddef.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55
  56 #include "installboot.h"
  57
  58 int
  59 shared_bbinfo_clearboot(ib_params *params, struct bbinfo_params *bbparams,
  60         int (*callback)(ib_params *, struct bbinfo_params *, uint8_t *))
  61 {
  62         uint8_t *bb;
  63         ssize_t rv;
  64         int     retval;
  65
  66         assert(params != NULL);
  67         assert(params->fsfd != -1);
  68         assert(params->filesystem != NULL);
  69         assert(bbparams != NULL);
  70         assert((strlen(bbparams->magic) + 1) == 32);
  71
  72         retval = 0;
  73         if ((bb = malloc(bbparams->maxsize)) == NULL) {
  74                 warn("Allocating %lu bytes for bbinfo",
  75                     (unsigned long) bbparams->maxsize);
  76                 goto done;
  77         }
  78
  79                 /* First check that it _could_ exist here */
  80         rv = pread(params->fsfd, bb, bbparams->maxsize, bbparams->offset);
  81         if (rv == -1) {
  82                 warn("Reading `%s'", params->filesystem);
  83                 goto done;
  84         } else if ((uint32_t)rv != bbparams->maxsize) {
  85                 warnx("Reading `%s': short read", params->filesystem);
  86                 goto done;
  87         }
  88
  89                 /* Now clear out (past the header offset) */
  90         memset(bb + bbparams->headeroffset, 0,
  91             bbparams->maxsize - bbparams->headeroffset);
  92         if (callback != NULL && ! (*callback)(params, bbparams, bb))
  93                 goto done;
  94
  95         if (params->flags & IB_VERBOSE)
  96                 printf("%slearing boot block\n",
  97                     (params->flags & IB_NOWRITE) ? "Not c" : "C");
  98         if (params->flags & IB_NOWRITE) {
  99                 retval = 1;
 100                 goto done;
 101         }
 102
 103         rv = pwrite(params->fsfd, bb, bbparams->maxsize, bbparams->offset);
 104 #ifdef DIOCWLABEL
 105         if (rv == -1 && errno == EROFS) {
 106                 /*
 107                  * The first sector might be protected by
 108                  * bounds_check_with_label(9)
 109                  */
 110                 int enable;
 111
 112                 enable = 1;
 113                 rv = ioctl(params->fsfd, DIOCWLABEL, &enable);
 114                 if (rv != 0) {
 115                         warn("Cannot enable writes to the label sector");
 116                         goto done;
 117                 }
 118
 119                 rv = pwrite(params->fsfd, bb, bbparams->maxsize,
 120                     bbparams->offset);
 121
 122                 /* Reset write-protect. */
 123                 enable = 0;
 124                 (void)ioctl(params->fsfd, DIOCWLABEL, &enable);
 125         }
 126 #endif
 127         if (rv == -1) {
 128                 warn("Writing `%s'", params->filesystem);
 129                 goto done;
 130         } else if ((uint32_t)rv != bbparams->maxsize) {
 131                 warnx("Writing `%s': short write", params->filesystem);
 132                 goto done;
 133         } else
 134                 retval = 1;
 135
 136  done:
 137         if (bb != NULL)
 138                 free(bb);
 139         return (retval);
 140 }
 141
 142 int
 143 shared_bbinfo_setboot(ib_params *params, struct bbinfo_params *bbparams,
 144         int (*callback)(ib_params *, struct bbinfo_params *, uint8_t *))
 145 {
 146         uint8_t         *bb;
 147         int             retval;
 148         ssize_t         rv;
 149         size_t          bbi;
 150         struct shared_bbinfo    *bbinfop;       /* bbinfo in prototype image */
 151         uint32_t        maxblk, nblk, blk_i;
 152         ib_block        *blocks;
 153
 154         assert(params != NULL);
 155         assert(params->fsfd != -1);
 156         assert(params->filesystem != NULL);
 157         assert(params->fstype != NULL);
 158         assert(params->s1fd != -1);
 159         assert(params->stage1 != NULL);
 160         assert(bbparams != NULL);
 161         assert((strlen(bbparams->magic) + 1) == 32);
 162
 163         bbinfop = NULL;         /* XXXGCC -Wuninitialized [sparc64] */
 164         retval = 0;
 165         blocks = NULL;
 166         if ((bb = malloc(bbparams->maxsize)) == NULL) {
 167                 warn("Allocating %lu bytes for bbinfo",
 168                     (unsigned long) bbparams->maxsize);
 169                 goto done;
 170         }
 171
 172         if (params->stage2 == NULL) {
 173                 warnx("Name of secondary bootstrap not provided");
 174                 goto done;
 175         }
 176
 177         if (params->s1stat.st_size >
 178             bbparams->maxsize - bbparams->headeroffset) {
 179                 warnx("`%s' cannot be larger than %lu bytes",
 180                     params->stage1, (unsigned long)(bbparams->maxsize -
 181                         bbparams->headeroffset));
 182                 goto done;
 183         }
 184
 185         memset(bb, 0, bbparams->maxsize);
 186         rv = read(params->s1fd, bb + bbparams->headeroffset,
 187             bbparams->maxsize - bbparams->headeroffset);
 188         if (rv == -1) {
 189                 warn("Reading `%s'", params->stage1);
 190                 goto done;
 191         }
 192
 193                 /*
 194                  * Quick sanity check that the bootstrap given
 195                  * is *not* an ELF executable.
 196                  */
 197         if (memcmp(bb + bbparams->headeroffset + 1, "ELF", strlen("ELF"))
 198             == 0) {
 199                 warnx("`%s' is an ELF executable; need raw binary",
 200                     params->stage1);
 201                 goto done;
 202         }
 203
 204 #define HOSTTOTARGET32(x) ((bbparams->endian == BBINFO_LITTLE_ENDIAN) \
 205                             ? (uint32_t)htole32((x)) : (uint32_t)htobe32((x)))
 206 #define TARGET32TOHOST(x) ((bbparams->endian == BBINFO_LITTLE_ENDIAN) \
 207                             ? (uint32_t)le32toh((x)) : (uint32_t)be32toh((x)))
 208
 209                 /* Look for the bbinfo structure. */
 210         bbinfop = NULL;
 211         for (bbi = 0; bbi < bbparams->maxsize; bbi += sizeof(uint32_t)) {
 212                 bbinfop = (void *) (bb + bbparams->headeroffset + bbi);
 213                 if (memcmp(bbinfop->bbi_magic, bbparams->magic,
 214                             sizeof(bbinfop->bbi_magic)) == 0)
 215                         break;
 216         }
 217         if (bbi >= bbparams->maxsize) {
 218                 warnx("%s bbinfo structure not found in `%s'",
 219                     params->machine->name, params->stage1);
 220                 goto done;
 221         }
 222         maxblk = TARGET32TOHOST(bbinfop->bbi_block_count);
 223         if (maxblk == 0 || maxblk > (bbparams->maxsize / sizeof(uint32_t))) {
 224                 warnx("%s bbinfo structure in `%s' has preposterous size `%u'",
 225                     params->machine->name, params->stage1, maxblk);
 226                 goto done;
 227         }
 228
 229                 /* Allocate space for our block list. */
 230         blocks = malloc(sizeof(*blocks) * maxblk);
 231         if (blocks == NULL) {
 232                 warn("Allocating %lu bytes",
 233                     (unsigned long)sizeof(*blocks) * maxblk);
 234                 goto done;
 235         }
 236
 237         if (S_ISREG(params->fsstat.st_mode)) {
 238                 if (fsync(params->fsfd) == -1)
 239                         warn("Synchronising file system `%s'",
 240                             params->filesystem);
 241         } else {
 242                 /* Ensure the secondary bootstrap is on disk. */
 243                 sync();
 244         }
 245
 246                 /* Collect the blocks for the secondary bootstrap. */
 247         nblk = maxblk;
 248         if (! params->fstype->findstage2(params, &nblk, blocks))
 249                 goto done;
 250         if (nblk == 0) {
 251                 warnx("Secondary bootstrap `%s' is empty",
 252                     params->stage2);
 253                 goto done;
 254         }
 255
 256                 /* Save those blocks in the primary bootstrap. */
 257         bbinfop->bbi_block_count = HOSTTOTARGET32(nblk);
 258         bbinfop->bbi_block_size = HOSTTOTARGET32(blocks[0].blocksize);
 259         for (blk_i = 0; blk_i < nblk; blk_i++) {
 260                 bbinfop->bbi_block_table[blk_i] =
 261                     HOSTTOTARGET32(blocks[blk_i].block);
 262                 if (blocks[blk_i].blocksize < blocks[0].blocksize &&
 263                     blk_i + 1 != nblk) {
 264                         warnx("Secondary bootstrap `%s' blocks do not have "
 265                             "a uniform size", params->stage2);
 266                         goto done;
 267                 }
 268         }
 269         if (callback != NULL && ! (*callback)(params, bbparams, bb))
 270                 goto done;
 271
 272         if (params->flags & IB_VERBOSE) {
 273                 printf("Bootstrap start sector: %u\n",
 274                     bbparams->offset / bbparams->blocksize);
 275                 printf("Bootstrap byte count:   %u\n", (unsigned)rv);
 276                 printf("Bootstrap block table:  "
 277                         "%u entries of %u bytes available, %u used:",
 278                     maxblk, blocks[0].blocksize, nblk);
 279                 for (blk_i = 0; blk_i < nblk; blk_i++)
 280                         printf(" %llu",
 281                             (unsigned long long)blocks[blk_i].block);
 282                 printf("\n%sriting bootstrap\n",
 283                     (params->flags & IB_NOWRITE) ? "Not w" : "W");
 284         }
 285         if (params->flags & IB_NOWRITE) {
 286                 retval = 1;
 287                 goto done;
 288         }
 289
 290         rv = pwrite(params->fsfd, bb, bbparams->maxsize, bbparams->offset);
 291 #ifdef DIOCWLABEL
 292         if (rv == -1 && errno == EROFS) {
 293                 /*
 294                  * The first sector might be protected by
 295                  * bounds_check_with_label(9)
 296                  */
 297                 int enable;
 298
 299                 enable = 1;
 300                 rv = ioctl(params->fsfd, DIOCWLABEL, &enable);
 301                 if (rv != 0) {
 302                         warn("Cannot enable writes to the label sector");
 303                         goto done;
 304                 }
 305
 306                 rv = pwrite(params->fsfd, bb, bbparams->maxsize,
 307                     bbparams->offset);
 308
 309                 /* Reset write-protect. */
 310                 enable = 0;
 311                 (void)ioctl(params->fsfd, DIOCWLABEL, &enable);
 312         }
 313 #endif
 314         if (rv == -1) {
 315                 warn("Writing `%s'", params->filesystem);
 316                 goto done;
 317         } else if ((uint32_t)rv != bbparams->maxsize) {
 318                 warnx("Writing `%s': short write", params->filesystem);
 319                 goto done;
 320         } else {
 321                 retval = 1;
 322         }
 323
 324  done:
 325         if (blocks != NULL)
 326                 free(blocks);
 327         if (bb != NULL)
 328                 free(bb);
 329         return (retval);
 330 }