1 /*- 2 * Copyright (c) 1994 Bruce D. Evans. 3 * All rights reserved. 4 * 5 * Copyright (c) 1982, 1986, 1988 Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. 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 * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 37 * from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $ 38 * $FreeBSD: src/sys/kern/subr_diskmbr.c,v 1.45 2000/01/28 10:22:07 bde Exp $ 39 * $DragonFly: src/sys/kern/subr_diskmbr.c,v 1.26 2007/06/19 06:07:57 dillon Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/buf.h> 45 #include <sys/conf.h> 46 #include <sys/diskslice.h> 47 #define DOSPTYP_EXTENDED 5 48 #define DOSPTYP_EXTENDEDX 15 49 #define DOSPTYP_ONTRACK 84 50 #include <sys/diskslice.h> 51 #include <sys/diskmbr.h> 52 #include <sys/disk.h> 53 #include <sys/malloc.h> 54 #include <sys/syslog.h> 55 #include <sys/device.h> 56 57 #define TRACE(str) do { if (dsi_debug) kprintf str; } while (0) 58 59 static volatile u_char dsi_debug; 60 61 /* 62 * This is what we have embedded in every boot1 for supporting the bogus 63 * "Dangerously Dedicated" mode. However, the old table is broken because 64 * it has an illegal geometry in it - it specifies 256 heads (heads = end 65 * head + 1) which causes nasty stuff when that wraps to zero in bios code. 66 * eg: divide by zero etc. This caused the dead-thinkpad problem, numerous 67 * SCSI bios crashes, EFI to crash, etc. 68 * 69 * We still have to recognize the old table though, even though we stopped 70 * inflicting it upon the world. 71 */ 72 static struct dos_partition historical_bogus_partition_table[NDOSPART] = { 73 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 74 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 75 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 76 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, }, 77 }; 78 static struct dos_partition historical_bogus_partition_table_fixed[NDOSPART] = { 79 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 80 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 81 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 82 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 254, 255, 255, 0, 50000, }, 83 }; 84 85 static int check_part (char *sname, struct dos_partition *dp, 86 u_int64_t offset, int nsectors, int ntracks, 87 u_int64_t mbr_offset); 88 static void mbr_extended (cdev_t dev, struct disk_info *info, 89 struct diskslices *ssp, u_int64_t ext_offset, 90 u_int64_t ext_size, u_int64_t base_ext_offset, 91 int nsectors, int ntracks, u_int64_t mbr_offset, 92 int level); 93 static int mbr_setslice (char *sname, struct disk_info *info, 94 struct diskslice *sp, struct dos_partition *dp, 95 u_int64_t br_offset); 96 97 98 int 99 mbrinit(cdev_t dev, struct disk_info *info, struct diskslices **sspp) 100 { 101 struct buf *bp; 102 u_char *cp; 103 int dospart; 104 struct dos_partition *dp; 105 struct dos_partition *dp0; 106 struct dos_partition dpcopy[NDOSPART]; 107 int error; 108 int max_ncyls; 109 int max_nsectors; 110 int max_ntracks; 111 u_int64_t mbr_offset; 112 char partname[2]; 113 u_long secpercyl; 114 char *sname = "tempname"; 115 struct diskslice *sp; 116 struct diskslices *ssp; 117 cdev_t wdev; 118 119 mbr_offset = DOSBBSECTOR; 120 reread_mbr: 121 if (info->d_media_blksize & DEV_BMASK) 122 return (EIO); 123 /* Read master boot record. */ 124 wdev = dev; 125 bp = geteblk((int)info->d_media_blksize); 126 bp->b_bio1.bio_offset = (off_t)mbr_offset * info->d_media_blksize; 127 bp->b_bio1.bio_done = biodone_sync; 128 bp->b_bio1.bio_flags |= BIO_SYNC; 129 bp->b_bcount = info->d_media_blksize; 130 bp->b_cmd = BUF_CMD_READ; 131 dev_dstrategy(wdev, &bp->b_bio1); 132 if (biowait(&bp->b_bio1, "mbrrd") != 0) { 133 if ((info->d_dsflags & DSO_MBRQUIET) == 0) { 134 diskerr(&bp->b_bio1, wdev, 135 "reading primary partition table: error", 136 LOG_PRINTF, 0); 137 kprintf("\n"); 138 } 139 error = EIO; 140 goto done; 141 } 142 143 /* Weakly verify it. */ 144 cp = bp->b_data; 145 //sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, WHOLE_SLICE_PART, partname); 146 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { 147 if (bootverbose) 148 kprintf("%s: invalid primary partition table: no magic\n", 149 sname); 150 error = EINVAL; 151 goto done; 152 } 153 154 /* Make a copy of the partition table to avoid alignment problems. */ 155 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); 156 157 dp0 = &dpcopy[0]; 158 159 /* 160 * Check for "Ontrack Diskmanager" or GPT. If a GPT is found in 161 * the first dos partition, ignore the rest of the MBR and go 162 * to GPT processing. 163 */ 164 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { 165 if (dospart == 0 && 166 (dp->dp_typ == DOSPTYP_PMBR || dp->dp_typ == DOSPTYP_GPT)) { 167 if (bootverbose) 168 kprintf( 169 "%s: Found GPT in slice #%d\n", sname, dospart + 1); 170 error = gptinit(dev, info, sspp); 171 goto done; 172 } 173 174 if (dp->dp_typ == DOSPTYP_ONTRACK) { 175 if (bootverbose) 176 kprintf( 177 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname); 178 bp->b_flags |= B_INVAL | B_AGE; 179 brelse(bp); 180 mbr_offset = 63; 181 goto reread_mbr; 182 } 183 } 184 185 if (bcmp(dp0, historical_bogus_partition_table, 186 sizeof historical_bogus_partition_table) == 0 || 187 bcmp(dp0, historical_bogus_partition_table_fixed, 188 sizeof historical_bogus_partition_table_fixed) == 0) { 189 #if 0 190 TRACE(("%s: invalid primary partition table: historical\n", 191 sname)); 192 #endif /* 0 */ 193 if (bootverbose) 194 kprintf( 195 "%s: invalid primary partition table: Dangerously Dedicated (ignored)\n", 196 sname); 197 error = EINVAL; 198 goto done; 199 } 200 201 /* Guess the geometry. */ 202 /* 203 * TODO: 204 * Perhaps skip entries with 0 size. 205 * Perhaps only look at entries of type DOSPTYP_386BSD. 206 */ 207 max_ncyls = 0; 208 max_nsectors = 0; 209 max_ntracks = 0; 210 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { 211 int ncyls; 212 int nsectors; 213 int ntracks; 214 215 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1; 216 if (max_ncyls < ncyls) 217 max_ncyls = ncyls; 218 nsectors = DPSECT(dp->dp_esect); 219 if (max_nsectors < nsectors) 220 max_nsectors = nsectors; 221 ntracks = dp->dp_ehd + 1; 222 if (max_ntracks < ntracks) 223 max_ntracks = ntracks; 224 } 225 226 /* 227 * Check that we have guessed the geometry right by checking the 228 * partition entries. 229 */ 230 /* 231 * TODO: 232 * As above. 233 * Check for overlaps. 234 * Check against d_secperunit if the latter is reliable. 235 */ 236 error = 0; 237 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { 238 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0 239 && dp->dp_start == 0 && dp->dp_size == 0) 240 continue; 241 //sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart, 242 // WHOLE_SLICE_PART, partname); 243 244 /* 245 * Temporarily ignore errors from this check. We could 246 * simplify things by accepting the table eariler if we 247 * always ignore errors here. Perhaps we should always 248 * accept the table if the magic is right but not let 249 * bad entries affect the geometry. 250 */ 251 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks, 252 mbr_offset); 253 } 254 if (error != 0) 255 goto done; 256 257 /* 258 * Accept the DOS partition table. 259 * 260 * Adjust the disk information structure with updated CHS 261 * conversion parameters, but only use values extracted from 262 * the primary partition table. 263 * 264 * NOTE! Regardless of our having to deal with this old cruft, 265 * we do not screw around with the info->d_media* parameters. 266 */ 267 secpercyl = (u_long)max_nsectors * max_ntracks; 268 if (secpercyl != 0 && mbr_offset == DOSBBSECTOR) { 269 info->d_secpertrack = max_nsectors; 270 info->d_nheads = max_ntracks; 271 info->d_secpercyl = secpercyl; 272 info->d_ncylinders = info->d_media_blocks / secpercyl; 273 } 274 275 /* 276 * We are passed a pointer to a suitably initialized minimal 277 * slices "struct" with no dangling pointers in it. Replace it 278 * by a maximal one. This usually oversizes the "struct", but 279 * enlarging it while searching for logical drives would be 280 * inconvenient. 281 */ 282 kfree(*sspp, M_DEVBUF); 283 ssp = dsmakeslicestruct(MAX_SLICES, info); 284 *sspp = ssp; 285 286 /* Initialize normal slices. */ 287 sp = &ssp->dss_slices[BASE_SLICE]; 288 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) { 289 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart, 290 WHOLE_SLICE_PART, partname); 291 (void)mbr_setslice(sname, info, sp, dp, mbr_offset); 292 } 293 ssp->dss_nslices = BASE_SLICE + NDOSPART; 294 295 /* Handle extended partitions. */ 296 sp -= NDOSPART; 297 for (dospart = 0; dospart < NDOSPART; dospart++, sp++) { 298 if (sp->ds_type == DOSPTYP_EXTENDED || 299 sp->ds_type == DOSPTYP_EXTENDEDX) { 300 mbr_extended(wdev, info, ssp, 301 sp->ds_offset, sp->ds_size, sp->ds_offset, 302 max_nsectors, max_ntracks, mbr_offset, 1); 303 } 304 } 305 306 /* 307 * mbr_extended() abuses ssp->dss_nslices for the number of slices 308 * that would be found if there were no limit on the number of slices 309 * in *ssp. Cut it back now. 310 */ 311 if (ssp->dss_nslices > MAX_SLICES) 312 ssp->dss_nslices = MAX_SLICES; 313 314 done: 315 bp->b_flags |= B_INVAL | B_AGE; 316 brelse(bp); 317 if (error == EINVAL) 318 error = 0; 319 return (error); 320 } 321 322 static int 323 check_part(char *sname, struct dos_partition *dp, u_int64_t offset, 324 int nsectors, int ntracks, u_int64_t mbr_offset) 325 { 326 int chs_ecyl; 327 int chs_esect; 328 int chs_scyl; 329 int chs_ssect; 330 int error; 331 u_long secpercyl; 332 u_int64_t esector; 333 u_int64_t esector1; 334 u_int64_t ssector; 335 u_int64_t ssector1; 336 337 secpercyl = (u_long)nsectors * ntracks; 338 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect); 339 chs_ssect = DPSECT(dp->dp_ssect); 340 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl 341 + mbr_offset; 342 ssector1 = offset + dp->dp_start; 343 344 /* 345 * If ssector1 is on a cylinder >= 1024, then ssector can't be right. 346 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct 347 * apart from the cylinder being reduced modulo 1024. Always allow 348 * 1023/255/63, because this is the official way to represent 349 * pure-LBA for the starting position. 350 */ 351 if ((ssector < ssector1 352 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1 353 && chs_scyl == 1023) 354 || (secpercyl != 0 355 && (ssector1 - ssector) % (1024 * secpercyl) == 0))) 356 || (dp->dp_scyl == 255 && dp->dp_shd == 255 357 && dp->dp_ssect == 255)) { 358 TRACE(("%s: C/H/S start %d/%d/%d, start %llu: allow\n", 359 sname, chs_scyl, dp->dp_shd, chs_ssect, 360 (long long)ssector1)); 361 ssector = ssector1; 362 } 363 364 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect); 365 chs_esect = DPSECT(dp->dp_esect); 366 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl 367 + mbr_offset; 368 esector1 = ssector1 + dp->dp_size - 1; 369 370 /* 371 * Allow certain bogus C/H/S values for esector, as above. However, 372 * heads == 255 isn't really legal and causes some BIOS crashes. The 373 * correct value to indicate a pure-LBA end is 1023/heads-1/sectors - 374 * usually 1023/254/63. "heads" is base 0, "sectors" is base 1. 375 */ 376 if ((esector < esector1 377 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1 378 && chs_ecyl == 1023) 379 || (secpercyl != 0 380 && (esector1 - esector) % (1024 * secpercyl) == 0))) 381 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255 382 && dp->dp_esect == 255)) { 383 TRACE(("%s: C/H/S end %d/%d/%d, end %llu: allow\n", 384 sname, chs_ecyl, dp->dp_ehd, chs_esect, 385 (long long)esector1)); 386 esector = esector1; 387 } 388 389 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL; 390 if (bootverbose) 391 kprintf("%s: type 0x%x, start %llu, end = %llu, size %u %s\n", 392 sname, dp->dp_typ, 393 (long long)ssector1, (long long)esector1, 394 dp->dp_size, (error ? "" : ": OK")); 395 if (ssector != ssector1 && bootverbose) 396 kprintf("%s: C/H/S start %d/%d/%d (%llu) != start %llu: invalid\n", 397 sname, chs_scyl, dp->dp_shd, chs_ssect, 398 (long long)ssector, (long long)ssector1); 399 if (esector != esector1 && bootverbose) 400 kprintf("%s: C/H/S end %d/%d/%d (%llu) != end %llu: invalid\n", 401 sname, chs_ecyl, dp->dp_ehd, chs_esect, 402 (long long)esector, (long long)esector1); 403 return (error); 404 } 405 406 static 407 void 408 mbr_extended(cdev_t dev, struct disk_info *info, struct diskslices *ssp, 409 u_int64_t ext_offset, u_int64_t ext_size, u_int64_t base_ext_offset, 410 int nsectors, int ntracks, u_int64_t mbr_offset, int level) 411 { 412 struct buf *bp; 413 u_char *cp; 414 int dospart; 415 struct dos_partition *dp; 416 struct dos_partition dpcopy[NDOSPART]; 417 u_int64_t ext_offsets[NDOSPART]; 418 u_int64_t ext_sizes[NDOSPART]; 419 char partname[2]; 420 int slice; 421 char *sname; 422 struct diskslice *sp; 423 424 if (level >= 16) { 425 kprintf( 426 "%s: excessive recursion in search for slices; aborting search\n", 427 devtoname(dev)); 428 return; 429 } 430 431 /* Read extended boot record. */ 432 bp = geteblk((int)info->d_media_blksize); 433 bp->b_bio1.bio_offset = (off_t)ext_offset * info->d_media_blksize; 434 bp->b_bio1.bio_done = biodone_sync; 435 bp->b_bio1.bio_flags |= BIO_SYNC; 436 bp->b_bcount = info->d_media_blksize; 437 bp->b_cmd = BUF_CMD_READ; 438 dev_dstrategy(dev, &bp->b_bio1); 439 if (biowait(&bp->b_bio1, "mbrrd") != 0) { 440 diskerr(&bp->b_bio1, dev, 441 "reading extended partition table: error", 442 LOG_PRINTF, 0); 443 kprintf("\n"); 444 goto done; 445 } 446 447 /* Weakly verify it. */ 448 cp = bp->b_data; 449 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { 450 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, WHOLE_SLICE_PART, 451 partname); 452 if (bootverbose) 453 kprintf("%s: invalid extended partition table: no magic\n", 454 sname); 455 goto done; 456 } 457 458 /* Make a copy of the partition table to avoid alignment problems. */ 459 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); 460 461 slice = ssp->dss_nslices; 462 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART; 463 dospart++, dp++) { 464 ext_sizes[dospart] = 0; 465 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0 466 && dp->dp_start == 0 && dp->dp_size == 0) 467 continue; 468 if (dp->dp_typ == DOSPTYP_EXTENDED || 469 dp->dp_typ == DOSPTYP_EXTENDEDX) { 470 static char buf[32]; 471 472 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, 473 WHOLE_SLICE_PART, partname); 474 ksnprintf(buf, sizeof(buf), "%s", sname); 475 if (strlen(buf) < sizeof buf - 11) 476 strcat(buf, "<extended>"); 477 check_part(buf, dp, base_ext_offset, nsectors, 478 ntracks, mbr_offset); 479 ext_offsets[dospart] = base_ext_offset + dp->dp_start; 480 ext_sizes[dospart] = dp->dp_size; 481 } else { 482 sname = dsname(dev, dkunit(dev), slice, WHOLE_SLICE_PART, 483 partname); 484 check_part(sname, dp, ext_offset, nsectors, ntracks, 485 mbr_offset); 486 if (slice >= MAX_SLICES) { 487 kprintf("%s: too many slices\n", sname); 488 slice++; 489 continue; 490 } 491 sp = &ssp->dss_slices[slice]; 492 if (mbr_setslice(sname, info, sp, dp, ext_offset) != 0) 493 continue; 494 slice++; 495 } 496 } 497 ssp->dss_nslices = slice; 498 499 /* If we found any more slices, recursively find all the subslices. */ 500 for (dospart = 0; dospart < NDOSPART; dospart++) { 501 if (ext_sizes[dospart] != 0) { 502 mbr_extended(dev, info, ssp, ext_offsets[dospart], 503 ext_sizes[dospart], base_ext_offset, 504 nsectors, ntracks, mbr_offset, ++level); 505 } 506 } 507 508 done: 509 bp->b_flags |= B_INVAL | B_AGE; 510 brelse(bp); 511 } 512 513 static int 514 mbr_setslice(char *sname, struct disk_info *info, struct diskslice *sp, 515 struct dos_partition *dp, u_int64_t br_offset) 516 { 517 u_int64_t offset; 518 u_int64_t size; 519 520 offset = br_offset + dp->dp_start; 521 if (offset > info->d_media_blocks || offset < br_offset) { 522 kprintf( 523 "%s: slice starts beyond end of the disk: rejecting it\n", 524 sname); 525 return (1); 526 } 527 size = info->d_media_blocks - offset; 528 if (size >= dp->dp_size) { 529 if (dp->dp_size == 0xFFFFFFFFU) { 530 kprintf("%s: slice >2TB, using media size instead " 531 "of slice table size\n", sname); 532 } else { 533 size = dp->dp_size; 534 } 535 } else { 536 kprintf("%s: slice extends beyond end of disk: " 537 "truncating from %u to %llu sectors\n", 538 sname, dp->dp_size, (unsigned long long)size); 539 } 540 sp->ds_offset = offset; 541 sp->ds_size = size; 542 sp->ds_type = dp->dp_typ; 543 bzero(&sp->ds_type_uuid, sizeof(sp->ds_type_uuid)); 544 bzero(&sp->ds_stor_uuid, sizeof(sp->ds_type_uuid)); 545 546 /* 547 * Slices do not overlap with the parent (if any). 548 */ 549 sp->ds_reserved = 0; 550 return (0); 551 } 552