1 /* $OpenBSD: i386_installboot.c,v 1.34 2020/02/28 12:26:30 otto Exp $ */ 2 /* $NetBSD: installboot.c,v 1.5 1995/11/17 23:23:50 gwr Exp $ */ 3 4 /* 5 * Copyright (c) 2013 Pedro Martelletto 6 * Copyright (c) 2011 Joel Sing <jsing@openbsd.org> 7 * Copyright (c) 2003 Tom Cosgrove <tom.cosgrove@arches-consulting.com> 8 * Copyright (c) 1997 Michael Shalayeff 9 * Copyright (c) 1994 Paul Kranenburg 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by Paul Kranenburg. 23 * 4. The name of the author may not be used to endorse or promote products 24 * derived from this software without specific prior written permission 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #define ELFSIZE 32 39 40 #include <sys/param.h> /* DEV_BSIZE */ 41 #include <sys/disklabel.h> 42 #include <sys/dkio.h> 43 #include <sys/ioctl.h> 44 #include <sys/mount.h> 45 #include <sys/reboot.h> 46 #include <sys/stat.h> 47 #include <sys/sysctl.h> 48 #include <sys/time.h> 49 50 #include <ufs/ufs/dinode.h> 51 #include <ufs/ufs/dir.h> 52 #include <ufs/ffs/fs.h> 53 54 #include <machine/cpu.h> 55 #include <machine/biosvar.h> 56 57 #include <elf.h> 58 #include <err.h> 59 #include <errno.h> 60 #include <fcntl.h> 61 #include <nlist.h> 62 #include <stdlib.h> 63 #include <stdio.h> 64 #include <stdint.h> 65 #include <string.h> 66 #include <unistd.h> 67 #include <util.h> 68 #include <uuid.h> 69 70 #include "installboot.h" 71 #include "i386_installboot.h" 72 73 char *bootldr; 74 75 char *blkstore; 76 size_t blksize; 77 78 struct sym_data pbr_symbols[] = { 79 {"_fs_bsize_p", 2}, 80 {"_fs_bsize_s", 2}, 81 {"_fsbtodb", 1}, 82 {"_p_offset", 4}, 83 {"_inodeblk", 4}, 84 {"_inodedbl", 4}, 85 {"_nblocks", 2}, 86 {"_blkincr", 1}, 87 {NULL} 88 }; 89 90 static void devread(int, void *, daddr_t, size_t, char *); 91 static u_int findopenbsd(int, struct disklabel *); 92 static int getbootparams(char *, int, struct disklabel *); 93 static char *loadproto(char *, long *); 94 static int gpt_chk_mbr(struct dos_partition *, u_int64_t); 95 static int sbchk(struct fs *, daddr_t); 96 static void sbread(int, daddr_t, struct fs **, char *); 97 98 static const daddr_t sbtry[] = SBLOCKSEARCH; 99 100 /* 101 * Read information about /boot's inode and filesystem parameters, then 102 * put biosboot (partition boot record) on the target drive with these 103 * parameters patched in. 104 */ 105 106 void 107 md_init(void) 108 { 109 stages = 2; 110 stage1 = "/usr/mdec/biosboot"; 111 stage2 = "/usr/mdec/boot"; 112 113 bootldr = "/boot"; 114 } 115 116 void 117 md_loadboot(void) 118 { 119 /* Load prototype boot blocks. */ 120 if ((blkstore = loadproto(stage1, &blksize)) == NULL) 121 exit(1); 122 123 /* XXX - Paranoia: Make sure size is aligned! */ 124 if (blksize & (DEV_BSIZE - 1)) 125 errx(1, "proto %s bad size=%ld", stage1, blksize); 126 127 if (blksize > SBSIZE - DEV_BSIZE) 128 errx(1, "proto bootblocks too big"); 129 } 130 131 void 132 md_installboot(int devfd, char *dev) 133 { 134 struct disklabel dl; 135 int part; 136 137 /* Get and check disklabel. */ 138 if (ioctl(devfd, DIOCGDINFO, &dl) == -1) 139 err(1, "disklabel: %s", dev); 140 if (dl.d_magic != DISKMAGIC) 141 errx(1, "bad disklabel magic=0x%08x", dl.d_magic); 142 143 /* Warn on unknown disklabel types. */ 144 if (dl.d_type == 0) 145 warnx("disklabel type unknown"); 146 147 part = findgptefisys(devfd, &dl); 148 if (part != -1) { 149 write_efisystem(&dl, (char)part); 150 return; 151 } 152 153 bootldr = fileprefix(root, bootldr); 154 if (bootldr == NULL) 155 exit(1); 156 if (verbose) 157 fprintf(stderr, "%s %s to %s\n", 158 (nowrite ? "would copy" : "copying"), stage2, bootldr); 159 if (!nowrite) 160 if (filecopy(stage2, bootldr) == -1) 161 exit(1); 162 163 /* Get bootstrap parameters to patch into proto. */ 164 if (getbootparams(bootldr, devfd, &dl) != 0) 165 exit(1); 166 167 /* Write boot blocks to device. */ 168 write_bootblocks(devfd, dev, &dl); 169 } 170 171 void 172 write_bootblocks(int devfd, char *dev, struct disklabel *dl) 173 { 174 struct stat sb; 175 u_int8_t *secbuf; 176 u_int start = 0; 177 178 /* Write patched proto bootblock(s) into the superblock. */ 179 if (fstat(devfd, &sb) == -1) 180 err(1, "fstat: %s", dev); 181 182 if (!S_ISCHR(sb.st_mode)) 183 errx(1, "%s: not a character device", dev); 184 185 /* Patch the parameters into the proto bootstrap sector. */ 186 pbr_set_symbols(stage1, blkstore, pbr_symbols); 187 188 if (!nowrite) { 189 /* Sync filesystems (to clean in-memory superblock?). */ 190 sync(); sleep(1); 191 } 192 193 /* 194 * Find OpenBSD partition. Floppies are special, getting an 195 * everything-in-one /boot starting at sector 0. 196 */ 197 if (dl->d_type != DTYPE_FLOPPY) { 198 start = findopenbsd(devfd, dl); 199 if (start == (u_int)-1) 200 errx(1, "no OpenBSD partition"); 201 } 202 203 if (verbose) 204 fprintf(stderr, "%s will be written at sector %u\n", 205 stage1, start); 206 207 if (start + (blksize / dl->d_secsize) > BOOTBIOS_MAXSEC) 208 warnx("%s extends beyond sector %u. OpenBSD might not boot.", 209 stage1, BOOTBIOS_MAXSEC); 210 211 if (!nowrite) { 212 secbuf = calloc(1, dl->d_secsize); 213 if (pread(devfd, secbuf, dl->d_secsize, (off_t)start * 214 dl->d_secsize) != dl->d_secsize) 215 err(1, "pread boot sector"); 216 bcopy(blkstore, secbuf, blksize); 217 if (pwrite(devfd, secbuf, dl->d_secsize, (off_t)start * 218 dl->d_secsize) != dl->d_secsize) 219 err(1, "pwrite bootstrap"); 220 free(secbuf); 221 } 222 } 223 224 void 225 write_efisystem(struct disklabel *dl, char part) 226 { 227 static char *fsckfmt = "/sbin/fsck_msdos %s >/dev/null"; 228 static char *newfsfmt ="/sbin/newfs_msdos %s >/dev/null"; 229 struct msdosfs_args args; 230 char cmd[60]; 231 char dst[PATH_MAX]; 232 char *src; 233 size_t mntlen, pathlen, srclen; 234 int rslt; 235 236 src = NULL; 237 238 /* Create directory for temporary mount point. */ 239 strlcpy(dst, "/tmp/installboot.XXXXXXXXXX", sizeof(dst)); 240 if (mkdtemp(dst) == NULL) 241 err(1, "mkdtemp('%s') failed", dst); 242 mntlen = strlen(dst); 243 244 /* Mount <duid>.<part> as msdos filesystem. */ 245 memset(&args, 0, sizeof(args)); 246 rslt = asprintf(&args.fspec, 247 "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx.%c", 248 dl->d_uid[0], dl->d_uid[1], dl->d_uid[2], dl->d_uid[3], 249 dl->d_uid[4], dl->d_uid[5], dl->d_uid[6], dl->d_uid[7], 250 part); 251 if (rslt == -1) { 252 warn("bad special device"); 253 goto rmdir; 254 } 255 256 args.export_info.ex_root = -2; /* unchecked anyway on DOS fs */ 257 args.export_info.ex_flags = 0; 258 259 if (mount(MOUNT_MSDOS, dst, 0, &args) == -1) { 260 /* Try fsck'ing it. */ 261 rslt = snprintf(cmd, sizeof(cmd), fsckfmt, args.fspec); 262 if (rslt >= sizeof(cmd)) { 263 warnx("can't build fsck command"); 264 rslt = -1; 265 goto rmdir; 266 } 267 rslt = system(cmd); 268 if (rslt == -1) { 269 warn("system('%s') failed", cmd); 270 goto rmdir; 271 } 272 if (mount(MOUNT_MSDOS, dst, 0, &args) == -1) { 273 /* Try newfs'ing it. */ 274 rslt = snprintf(cmd, sizeof(cmd), newfsfmt, 275 args.fspec); 276 if (rslt >= sizeof(cmd)) { 277 warnx("can't build newfs command"); 278 rslt = -1; 279 goto rmdir; 280 } 281 rslt = system(cmd); 282 if (rslt == -1) { 283 warn("system('%s') failed", cmd); 284 goto rmdir; 285 } 286 rslt = mount(MOUNT_MSDOS, dst, 0, &args); 287 if (rslt == -1) { 288 warn("unable to mount EFI System partition"); 289 goto rmdir; 290 } 291 } 292 } 293 294 /* Create "/efi/BOOT" directory in <duid>.<part>. */ 295 if (strlcat(dst, "/efi", sizeof(dst)) >= sizeof(dst)) { 296 rslt = -1; 297 warn("unable to build /efi directory"); 298 goto umount; 299 } 300 rslt = mkdir(dst, 0); 301 if (rslt == -1 && errno != EEXIST) { 302 warn("mkdir('%s') failed", dst); 303 goto umount; 304 } 305 if (strlcat(dst, "/BOOT", sizeof(dst)) >= sizeof(dst)) { 306 rslt = -1; 307 warn("unable to build /BOOT directory"); 308 goto umount; 309 } 310 rslt = mkdir(dst, 0); 311 if (rslt == -1 && errno != EEXIST) { 312 warn("mkdir('%s') failed", dst); 313 goto umount; 314 } 315 316 /* 317 * Copy BOOTIA32.EFI and BOOTX64.EFI to /efi/BOOT/. 318 * 319 * N.B.: BOOTIA32.EFI is longer than BOOTX64.EFI, so src can be reused! 320 */ 321 pathlen = strlen(dst); 322 if (strlcat(dst, "/BOOTIA32.EFI", sizeof(dst)) >= sizeof(dst)) { 323 rslt = -1; 324 warn("unable to build /BOOTIA32.EFI path"); 325 goto umount; 326 } 327 src = fileprefix(root, "/usr/mdec/BOOTIA32.EFI"); 328 if (src == NULL) { 329 rslt = -1; 330 goto umount; 331 } 332 srclen = strlen(src); 333 if (verbose) 334 fprintf(stderr, "%s %s to %s\n", 335 (nowrite ? "would copy" : "copying"), src, dst); 336 if (!nowrite) { 337 rslt = filecopy(src, dst); 338 if (rslt == -1) 339 goto umount; 340 } 341 src[srclen - strlen("/BOOTIA32.EFI")] = '\0'; 342 343 dst[pathlen] = '\0'; 344 if (strlcat(dst, "/BOOTX64.EFI", sizeof(dst)) >= sizeof(dst)) { 345 rslt = -1; 346 warn("unable to build /BOOTX64.EFI dst path"); 347 goto umount; 348 } 349 if (strlcat(src, "/BOOTX64.EFI", srclen+1) >= srclen+1) { 350 rslt = -1; 351 warn("unable to build /BOOTX64.EFI src path"); 352 goto umount; 353 } 354 if (verbose) 355 fprintf(stderr, "%s %s to %s\n", 356 (nowrite ? "would copy" : "copying"), src, dst); 357 if (!nowrite) { 358 rslt = filecopy(src, dst); 359 if (rslt == -1) 360 goto umount; 361 } 362 363 rslt = 0; 364 365 umount: 366 dst[mntlen] = '\0'; 367 if (unmount(dst, MNT_FORCE) == -1) 368 err(1, "unmount('%s') failed", dst); 369 370 rmdir: 371 free(args.fspec); 372 dst[mntlen] = '\0'; 373 if (rmdir(dst) == -1) 374 err(1, "rmdir('%s') failed", dst); 375 376 free(src); 377 378 if (rslt == -1) 379 exit(1); 380 } 381 382 u_int 383 findopenbsd(int devfd, struct disklabel *dl) 384 { 385 struct dos_mbr mbr; 386 u_int mbroff = DOSBBSECTOR; 387 u_int mbr_eoff = DOSBBSECTOR; /* Offset of extended part. */ 388 struct dos_partition *dp; 389 u_int8_t *secbuf; 390 u_int maxebr = DOS_MAXEBR, nextebr; 391 int i; 392 393 again: 394 if (!maxebr--) { 395 if (verbose) 396 fprintf(stderr, "Traversed more than %d Extended Boot " 397 "Records (EBRs)\n", DOS_MAXEBR); 398 return ((u_int)-1); 399 } 400 401 if (verbose) 402 fprintf(stderr, "%s boot record (%cBR) at sector %u\n", 403 (mbroff == DOSBBSECTOR) ? "master" : "extended", 404 (mbroff == DOSBBSECTOR) ? 'M' : 'E', mbroff); 405 406 if ((secbuf = malloc(dl->d_secsize)) == NULL) 407 err(1, NULL); 408 if (pread(devfd, secbuf, dl->d_secsize, (off_t)mbroff * dl->d_secsize) 409 < (ssize_t)sizeof(mbr)) 410 err(4, "can't pread boot record"); 411 bcopy(secbuf, &mbr, sizeof(mbr)); 412 free(secbuf); 413 414 if (mbr.dmbr_sign != DOSMBR_SIGNATURE) 415 errx(1, "invalid boot record signature (0x%04X) @ sector %u", 416 mbr.dmbr_sign, mbroff); 417 418 nextebr = 0; 419 for (i = 0; i < NDOSPART; i++) { 420 dp = &mbr.dmbr_parts[i]; 421 if (!dp->dp_size) 422 continue; 423 424 if (verbose) 425 fprintf(stderr, 426 "\tpartition %d: type 0x%02X offset %u size %u\n", 427 i, dp->dp_typ, dp->dp_start, dp->dp_size); 428 429 if (dp->dp_typ == DOSPTYP_OPENBSD) { 430 if (dp->dp_start > (dp->dp_start + mbroff)) 431 continue; 432 return (dp->dp_start + mbroff); 433 } 434 435 if (!nextebr && (dp->dp_typ == DOSPTYP_EXTEND || 436 dp->dp_typ == DOSPTYP_EXTENDL)) { 437 nextebr = dp->dp_start + mbr_eoff; 438 if (nextebr < dp->dp_start) 439 nextebr = (u_int)-1; 440 if (mbr_eoff == DOSBBSECTOR) 441 mbr_eoff = dp->dp_start; 442 } 443 } 444 445 if (nextebr && nextebr != (u_int)-1) { 446 mbroff = nextebr; 447 goto again; 448 } 449 450 return ((u_int)-1); 451 } 452 453 /* 454 * Returns 0 if the MBR with the provided partition array is a GPT protective 455 * MBR, and returns 1 otherwise. A GPT protective MBR would have one and only 456 * one MBR partition, an EFI partition that either covers the whole disk or as 457 * much of it as is possible with a 32bit size field. 458 * 459 * NOTE: MS always uses a size of UINT32_MAX for the EFI partition!** 460 */ 461 static int 462 gpt_chk_mbr(struct dos_partition *dp, u_int64_t dsize) 463 { 464 struct dos_partition *dp2; 465 int efi, found, i; 466 u_int32_t psize; 467 468 found = efi = 0; 469 for (dp2=dp, i=0; i < NDOSPART; i++, dp2++) { 470 if (dp2->dp_typ == DOSPTYP_UNUSED) 471 continue; 472 found++; 473 if (dp2->dp_typ != DOSPTYP_EFI) 474 continue; 475 psize = letoh32(dp2->dp_size); 476 if (psize == (dsize - 1) || 477 psize == UINT32_MAX) { 478 if (letoh32(dp2->dp_start) == 1) 479 efi++; 480 } 481 } 482 if (found == 1 && efi == 1) 483 return (0); 484 485 return (1); 486 } 487 488 int 489 findgptefisys(int devfd, struct disklabel *dl) 490 { 491 struct gpt_partition gp[NGPTPARTITIONS]; 492 struct gpt_header gh; 493 struct dos_partition dp[NDOSPART]; 494 struct uuid efisys_uuid; 495 const char efisys_uuid_code[] = GPT_UUID_EFI_SYSTEM; 496 off_t off; 497 ssize_t len; 498 u_int64_t start; 499 int i; 500 uint32_t orig_csum, new_csum; 501 uint32_t ghsize, ghpartsize, ghpartnum, ghpartspersec; 502 u_int8_t *secbuf; 503 504 /* Prepare EFI System UUID */ 505 uuid_dec_be(efisys_uuid_code, &efisys_uuid); 506 507 if ((secbuf = malloc(dl->d_secsize)) == NULL) 508 err(1, NULL); 509 510 /* Check that there is a protective MBR. */ 511 len = pread(devfd, secbuf, dl->d_secsize, 0); 512 if (len != dl->d_secsize) 513 err(4, "can't read mbr"); 514 memcpy(dp, &secbuf[DOSPARTOFF], sizeof(dp)); 515 if (gpt_chk_mbr(dp, DL_GETDSIZE(dl))) { 516 free(secbuf); 517 return (-1); 518 } 519 520 /* Check GPT Header. */ 521 off = dl->d_secsize; /* Read header from sector 1. */ 522 len = pread(devfd, secbuf, dl->d_secsize, off); 523 if (len != dl->d_secsize) 524 err(4, "can't pread gpt header"); 525 526 memcpy(&gh, secbuf, sizeof(gh)); 527 free(secbuf); 528 529 /* Check signature */ 530 if (letoh64(gh.gh_sig) != GPTSIGNATURE) 531 return (-1); 532 533 if (letoh32(gh.gh_rev) != GPTREVISION) 534 return (-1); 535 536 ghsize = letoh32(gh.gh_size); 537 if (ghsize < GPTMINHDRSIZE || ghsize > sizeof(struct gpt_header)) 538 return (-1); 539 540 /* Check checksum */ 541 orig_csum = gh.gh_csum; 542 gh.gh_csum = 0; 543 new_csum = crc32((unsigned char *)&gh, ghsize); 544 gh.gh_csum = orig_csum; 545 if (letoh32(orig_csum) != new_csum) 546 return (-1); 547 548 off = letoh64(gh.gh_part_lba) * dl->d_secsize; 549 ghpartsize = letoh32(gh.gh_part_size); 550 ghpartspersec = dl->d_secsize / ghpartsize; 551 ghpartnum = letoh32(gh.gh_part_num); 552 if ((secbuf = malloc(dl->d_secsize)) == NULL) 553 err(1, NULL); 554 for (i = 0; i < (ghpartnum + ghpartspersec - 1) / ghpartspersec; i++) { 555 len = pread(devfd, secbuf, dl->d_secsize, off); 556 if (len != dl->d_secsize) { 557 free(secbuf); 558 return (-1); 559 } 560 memcpy(gp + i * ghpartspersec, secbuf, 561 ghpartspersec * sizeof(struct gpt_partition)); 562 off += dl->d_secsize; 563 } 564 free(secbuf); 565 new_csum = crc32((unsigned char *)&gp, ghpartnum * ghpartsize); 566 if (new_csum != letoh32(gh.gh_part_csum)) 567 return (-1); 568 569 start = 0; 570 for (i = 0; i < ghpartnum && start == 0; i++) { 571 if (memcmp(&gp[i].gp_type, &efisys_uuid, 572 sizeof(struct uuid)) == 0) 573 start = letoh64(gp[i].gp_lba_start); 574 } 575 576 if (start) { 577 for (i = 0; i < MAXPARTITIONS; i++) { 578 if (DL_GETPSIZE(&dl->d_partitions[i]) > 0 && 579 DL_GETPOFFSET(&dl->d_partitions[i]) == start) 580 return ('a' + i); 581 } 582 } 583 584 return (-1); 585 } 586 587 /* 588 * Load the prototype boot sector (biosboot) into memory. 589 */ 590 static char * 591 loadproto(char *fname, long *size) 592 { 593 int fd; 594 size_t tdsize; /* text+data size */ 595 char *bp; 596 Elf_Ehdr eh; 597 Elf_Word phsize; 598 Elf_Phdr *ph; 599 600 if ((fd = open(fname, O_RDONLY)) == -1) 601 err(1, "%s", fname); 602 603 if (read(fd, &eh, sizeof(eh)) != sizeof(eh)) 604 errx(1, "%s: read failed", fname); 605 606 if (!IS_ELF(eh)) 607 errx(1, "%s: bad magic: 0x%02x%02x%02x%02x", fname, 608 eh.e_ident[EI_MAG0], eh.e_ident[EI_MAG1], 609 eh.e_ident[EI_MAG2], eh.e_ident[EI_MAG3]); 610 611 /* 612 * We have to include the exec header in the beginning of 613 * the buffer, and leave extra space at the end in case 614 * the actual write to disk wants to skip the header. 615 */ 616 617 /* Program load header. */ 618 if (eh.e_phnum != 1) 619 errx(1, "%s: %u ELF load sections (only support 1)", 620 fname, eh.e_phnum); 621 622 ph = reallocarray(NULL, eh.e_phnum, sizeof(Elf_Phdr)); 623 if (ph == NULL) 624 err(1, NULL); 625 phsize = eh.e_phnum * sizeof(Elf_Phdr); 626 627 if (pread(fd, ph, phsize, eh.e_phoff) != phsize) 628 errx(1, "%s: can't pread header", fname); 629 630 tdsize = ph->p_filesz; 631 632 /* 633 * Allocate extra space here because the caller may copy 634 * the boot block starting at the end of the exec header. 635 * This prevents reading beyond the end of the buffer. 636 */ 637 if ((bp = calloc(tdsize, 1)) == NULL) 638 err(1, NULL); 639 640 /* Read the rest of the file. */ 641 if (pread(fd, bp, tdsize, ph->p_offset) != (ssize_t)tdsize) 642 errx(1, "%s: pread failed", fname); 643 644 *size = tdsize; /* not aligned to DEV_BSIZE */ 645 646 close(fd); 647 return bp; 648 } 649 650 static void 651 devread(int fd, void *buf, daddr_t blk, size_t size, char *msg) 652 { 653 if (pread(fd, buf, size, dbtob((off_t)blk)) != (ssize_t)size) 654 err(1, "%s: devread: pread", msg); 655 } 656 657 /* 658 * Read information about /boot's inode, then put this and filesystem 659 * parameters from the superblock into pbr_symbols. 660 */ 661 static int 662 getbootparams(char *boot, int devfd, struct disklabel *dl) 663 { 664 int fd; 665 struct stat dsb, fsb; 666 struct statfs fssb; 667 struct partition *pp; 668 struct fs *fs; 669 char *sblock, *buf; 670 u_int blk, *ap; 671 int ndb; 672 int mib[3]; 673 size_t size; 674 dev_t dev; 675 int incr; 676 677 /* 678 * Open 2nd-level boot program and record enough details about 679 * where it is on the filesystem represented by `devfd' 680 * (inode block, offset within that block, and various filesystem 681 * parameters essentially taken from the superblock) for biosboot 682 * to be able to load it later. 683 */ 684 685 /* Make sure the (probably new) boot file is on disk. */ 686 sync(); sleep(1); 687 688 if ((fd = open(boot, O_RDONLY)) == -1) 689 err(1, "open: %s", boot); 690 691 if (fstatfs(fd, &fssb) == -1) 692 err(1, "statfs: %s", boot); 693 694 if (strncmp(fssb.f_fstypename, "ffs", MFSNAMELEN) && 695 strncmp(fssb.f_fstypename, "ufs", MFSNAMELEN) ) 696 errx(1, "%s: not on an FFS filesystem", boot); 697 698 #if 0 699 if (read(fd, &eh, sizeof(eh)) != sizeof(eh)) 700 errx(1, "read: %s", boot); 701 702 if (!IS_ELF(eh)) { 703 errx(1, "%s: bad magic: 0x%02x%02x%02x%02x", 704 boot, 705 eh.e_ident[EI_MAG0], eh.e_ident[EI_MAG1], 706 eh.e_ident[EI_MAG2], eh.e_ident[EI_MAG3]); 707 } 708 #endif 709 710 if (fsync(fd) != 0) 711 err(1, "fsync: %s", boot); 712 713 if (fstat(fd, &fsb) != 0) 714 err(1, "fstat: %s", boot); 715 716 if (fstat(devfd, &dsb) != 0) 717 err(1, "fstat: %d", devfd); 718 719 /* Check devices. */ 720 mib[0] = CTL_MACHDEP; 721 mib[1] = CPU_CHR2BLK; 722 mib[2] = dsb.st_rdev; 723 size = sizeof(dev); 724 if (sysctl(mib, 3, &dev, &size, NULL, 0) >= 0) { 725 if (fsb.st_dev / MAXPARTITIONS != dev / MAXPARTITIONS) 726 errx(1, "cross-device install"); 727 } 728 729 pp = &dl->d_partitions[DISKPART(fsb.st_dev)]; 730 close(fd); 731 732 if ((sblock = malloc(SBSIZE)) == NULL) 733 err(1, NULL); 734 735 sbread(devfd, DL_SECTOBLK(dl, pp->p_offset), &fs, sblock); 736 737 /* Read inode. */ 738 if ((buf = malloc(fs->fs_bsize)) == NULL) 739 err(1, NULL); 740 741 blk = fsbtodb(fs, ino_to_fsba(fs, fsb.st_ino)); 742 743 /* 744 * Have the inode. Figure out how many filesystem blocks (not disk 745 * sectors) there are for biosboot to load. 746 */ 747 devread(devfd, buf, DL_SECTOBLK(dl, pp->p_offset) + blk, 748 fs->fs_bsize, "inode"); 749 if (fs->fs_magic == FS_UFS2_MAGIC) { 750 struct ufs2_dinode *ip2 = (struct ufs2_dinode *)(buf) + 751 ino_to_fsbo(fs, fsb.st_ino); 752 ndb = howmany(ip2->di_size, fs->fs_bsize); 753 ap = (u_int *)ip2->di_db; 754 incr = sizeof(u_int32_t); 755 } else { 756 struct ufs1_dinode *ip1 = (struct ufs1_dinode *)(buf) + 757 ino_to_fsbo(fs, fsb.st_ino); 758 ndb = howmany(ip1->di_size, fs->fs_bsize); 759 ap = (u_int *)ip1->di_db; 760 incr = 0; 761 } 762 763 if (ndb <= 0) 764 errx(1, "No blocks to load"); 765 766 /* 767 * Now set the values that will need to go into biosboot 768 * (the partition boot record, a.k.a. the PBR). 769 */ 770 sym_set_value(pbr_symbols, "_fs_bsize_p", (fs->fs_bsize / 16)); 771 sym_set_value(pbr_symbols, "_fs_bsize_s", (fs->fs_bsize / 772 dl->d_secsize)); 773 774 /* 775 * fs_fsbtodb is the shift to convert fs_fsize to DEV_BSIZE. The 776 * ino_to_fsba() return value is the number of fs_fsize units. 777 * Calculate the shift to convert fs_fsize into physical sectors, 778 * which are added to p_offset to get the sector address BIOS 779 * will use. 780 * 781 * N.B.: ASSUMES fs_fsize is a power of 2 of d_secsize. 782 */ 783 sym_set_value(pbr_symbols, "_fsbtodb", 784 ffs(fs->fs_fsize / dl->d_secsize) - 1); 785 786 sym_set_value(pbr_symbols, "_p_offset", pp->p_offset); 787 sym_set_value(pbr_symbols, "_inodeblk", 788 ino_to_fsba(fs, fsb.st_ino)); 789 sym_set_value(pbr_symbols, "_inodedbl", 790 ((((char *)ap) - buf) + INODEOFF)); 791 sym_set_value(pbr_symbols, "_nblocks", ndb); 792 sym_set_value(pbr_symbols, "_blkincr", incr); 793 794 if (verbose) { 795 fprintf(stderr, "%s is %d blocks x %d bytes\n", 796 boot, ndb, fs->fs_bsize); 797 fprintf(stderr, "fs block shift %u; part offset %u; " 798 "inode block %lld, offset %u\n", 799 ffs(fs->fs_fsize / dl->d_secsize) - 1, 800 pp->p_offset, 801 ino_to_fsba(fs, fsb.st_ino), 802 (unsigned int)((((char *)ap) - buf) + INODEOFF)); 803 fprintf(stderr, "expecting %d-bit fs blocks (incr %d)\n", 804 incr ? 64 : 32, incr); 805 } 806 807 free (sblock); 808 free (buf); 809 810 return 0; 811 } 812 813 void 814 sym_set_value(struct sym_data *sym_list, char *sym, u_int32_t value) 815 { 816 struct sym_data *p; 817 818 for (p = sym_list; p->sym_name != NULL; p++) { 819 if (strcmp(p->sym_name, sym) == 0) 820 break; 821 } 822 823 if (p->sym_name == NULL) 824 errx(1, "%s: no such symbol", sym); 825 826 p->sym_value = value; 827 p->sym_set = 1; 828 } 829 830 /* 831 * Write the parameters stored in sym_list into the in-memory copy of 832 * the prototype biosboot (proto), ready for it to be written to disk. 833 */ 834 void 835 pbr_set_symbols(char *fname, char *proto, struct sym_data *sym_list) 836 { 837 struct sym_data *sym; 838 struct nlist *nl; 839 char *vp; 840 u_int32_t *lp; 841 u_int16_t *wp; 842 u_int8_t *bp; 843 844 for (sym = sym_list; sym->sym_name != NULL; sym++) { 845 if (!sym->sym_set) 846 errx(1, "%s not set", sym->sym_name); 847 848 /* Allocate space for 2; second is null-terminator for list. */ 849 nl = calloc(2, sizeof(struct nlist)); 850 if (nl == NULL) 851 err(1, NULL); 852 853 nl->n_name = sym->sym_name; 854 855 if (nlist_elf32(fname, nl) != 0) 856 errx(1, "%s: symbol %s not found", 857 fname, sym->sym_name); 858 859 if (nl->n_type != (N_TEXT)) 860 errx(1, "%s: %s: wrong type (%x)", 861 fname, sym->sym_name, nl->n_type); 862 863 /* Get a pointer to where the symbol's value needs to go. */ 864 vp = proto + nl->n_value; 865 866 switch (sym->sym_size) { 867 case 4: /* u_int32_t */ 868 lp = (u_int32_t *) vp; 869 *lp = sym->sym_value; 870 break; 871 case 2: /* u_int16_t */ 872 if (sym->sym_value >= 0x10000) /* out of range */ 873 errx(1, "%s: symbol out of range (%u)", 874 sym->sym_name, sym->sym_value); 875 wp = (u_int16_t *) vp; 876 *wp = (u_int16_t) sym->sym_value; 877 break; 878 case 1: /* u_int16_t */ 879 if (sym->sym_value >= 0x100) /* out of range */ 880 errx(1, "%s: symbol out of range (%u)", 881 sym->sym_name, sym->sym_value); 882 bp = (u_int8_t *) vp; 883 *bp = (u_int8_t) sym->sym_value; 884 break; 885 default: 886 errx(1, "%s: bad symbol size %d", 887 sym->sym_name, sym->sym_size); 888 /* NOTREACHED */ 889 } 890 891 free(nl); 892 } 893 } 894 895 static int 896 sbchk(struct fs *fs, daddr_t sbloc) 897 { 898 if (verbose) 899 fprintf(stderr, "looking for superblock at %lld\n", sbloc); 900 901 if (fs->fs_magic != FS_UFS2_MAGIC && fs->fs_magic != FS_UFS1_MAGIC) { 902 if (verbose) 903 fprintf(stderr, "bad superblock magic 0x%x\n", 904 fs->fs_magic); 905 return (0); 906 } 907 908 /* 909 * Looking for an FFS1 file system at SBLOCK_UFS2 will find the 910 * wrong superblock for file systems with 64k block size. 911 */ 912 if (fs->fs_magic == FS_UFS1_MAGIC && sbloc == SBLOCK_UFS2) { 913 if (verbose) 914 fprintf(stderr, "skipping ffs1 superblock at %lld\n", 915 sbloc); 916 return (0); 917 } 918 919 if (fs->fs_bsize <= 0 || fs->fs_bsize < sizeof(struct fs) || 920 fs->fs_bsize > MAXBSIZE) { 921 if (verbose) 922 fprintf(stderr, "invalid superblock block size %d\n", 923 fs->fs_bsize); 924 return (0); 925 } 926 927 if (fs->fs_sbsize <= 0 || fs->fs_sbsize > SBSIZE) { 928 if (verbose) 929 fprintf(stderr, "invalid superblock size %d\n", 930 fs->fs_sbsize); 931 return (0); 932 } 933 934 if (fs->fs_inopb <= 0) { 935 if (verbose) 936 fprintf(stderr, "invalid superblock inodes/block %d\n", 937 fs->fs_inopb); 938 return (0); 939 } 940 941 if (verbose) 942 fprintf(stderr, "found valid %s superblock\n", 943 fs->fs_magic == FS_UFS2_MAGIC ? "ffs2" : "ffs1"); 944 945 return (1); 946 } 947 948 static void 949 sbread(int fd, daddr_t poffset, struct fs **fs, char *sblock) 950 { 951 int i; 952 daddr_t sboff; 953 954 for (i = 0; sbtry[i] != -1; i++) { 955 sboff = sbtry[i] / DEV_BSIZE; 956 devread(fd, sblock, poffset + sboff, SBSIZE, "superblock"); 957 *fs = (struct fs *)sblock; 958 if (sbchk(*fs, sbtry[i])) 959 break; 960 } 961 962 if (sbtry[i] == -1) 963 errx(1, "couldn't find ffs superblock"); 964 } 965