1 /* $NetBSD: landisk.c,v 1.5 2009/05/07 07:03:39 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by David Laight. 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: landisk.c,v 1.5 2009/05/07 07:03:39 lukem Exp $"); 39 #endif /* !__lint */ 40 41 #include <sys/param.h> 42 43 #include <assert.h> 44 #include <err.h> 45 #include <md5.h> 46 #include <stddef.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 52 #include "installboot.h" 53 54 static int landisk_setboot(ib_params *); 55 56 struct ib_mach ib_mach_landisk = 57 { "landisk", landisk_setboot, no_clearboot, no_editboot, 58 IB_TIMEOUT }; 59 60 static int 61 landisk_setboot(ib_params *params) 62 { 63 struct mbr_sector mbr; 64 struct landisk_boot_params bp, *bpp; 65 uint8_t *bootstrapbuf; 66 ssize_t rv; 67 uint32_t magic; 68 size_t bootstrapsize; 69 int retval, i; 70 uint32_t bplen; 71 int bpbsize; 72 73 assert(params != NULL); 74 assert(params->fsfd != -1); 75 assert(params->filesystem != NULL); 76 assert(params->s1fd != -1); 77 assert(params->stage1 != NULL); 78 79 retval = 0; 80 bootstrapbuf = NULL; 81 82 /* 83 * There is only 8k of space in a FFSv1 partition (and ustarfs) 84 * so ensure we don't splat over anything important. 85 */ 86 if (params->s1stat.st_size > 8192) { 87 warnx("stage1 bootstrap `%s' is larger than 8192 bytes", 88 params->stage1); 89 goto done; 90 } 91 92 /* 93 * Read in the existing MBR. 94 */ 95 rv = pread(params->fsfd, &mbr, sizeof(mbr), MBR_BBSECTOR); 96 if (rv == -1) { 97 warn("Reading `%s'", params->filesystem); 98 goto done; 99 } else if (rv != sizeof(mbr)) { 100 warnx("Reading `%s': short read", params->filesystem); 101 goto done; 102 } 103 if (mbr.mbr_magic != le16toh(MBR_MAGIC)) { 104 if (params->flags & IB_VERBOSE) { 105 printf( 106 "Ignoring MBR with invalid magic in sector 0 of `%s'\n", 107 params->filesystem); 108 } 109 memset(&mbr, 0, sizeof(mbr)); 110 } 111 112 /* 113 * Allocate a buffer, with space to round up the input file 114 * to the next block size boundary, and with space for the boot 115 * block. 116 */ 117 bootstrapsize = roundup(params->s1stat.st_size, 512); 118 119 bootstrapbuf = malloc(bootstrapsize); 120 if (bootstrapbuf == NULL) { 121 warn("Allocating %zu bytes", bootstrapsize); 122 goto done; 123 } 124 memset(bootstrapbuf, 0, bootstrapsize); 125 126 /* 127 * Read the file into the buffer. 128 */ 129 rv = pread(params->s1fd, bootstrapbuf, params->s1stat.st_size, 0); 130 if (rv == -1) { 131 warn("Reading `%s'", params->stage1); 132 goto done; 133 } else if (rv != params->s1stat.st_size) { 134 warnx("Reading `%s': short read", params->stage1); 135 goto done; 136 } 137 138 magic = *(uint32_t *)(bootstrapbuf + 512 * 2 + 4); 139 if (magic != htole32(LANDISK_BOOT_MAGIC_1)) { 140 warnx("Invalid magic in stage1 boostrap %x != %x", 141 magic, htole32(LANDISK_BOOT_MAGIC_1)); 142 goto done; 143 } 144 145 /* 146 * Determine size of BIOS Parameter Block (BPB) to copy from 147 * original MBR to the temporary buffer by examining the first 148 * few instruction in the new bootblock. Supported values: 149 * 2b a0 11 jmp ENDOF(mbr_bpbFAT32)+1, nop 150 * (anything else) ; don't preserve 151 */ 152 bpbsize = 0; 153 #if 0 154 if (bootstrapbuf[1] == 0xa0 && bootstrapbuf[2] == 0x11 && 155 (bootstrapbuf[0] == 0x2b /*|| bootstrapbuf[0] == 0x1d*/)) { 156 bpbsize = bootstrapbuf[0] + 2 - MBR_BPB_OFFSET; 157 } 158 #endif 159 160 /* 161 * Ensure bootxx hasn't got any code or data (i.e, non-zero bytes) in 162 * the partition table. 163 */ 164 for (i = 0; i < (int)sizeof(mbr.mbr_parts); i++) { 165 if (*(uint8_t *)(bootstrapbuf + MBR_PART_OFFSET + i) != 0) { 166 warnx( 167 "Partition table has non-zero byte at offset %d in `%s'", 168 MBR_PART_OFFSET + i, params->stage1); 169 goto done; 170 } 171 } 172 173 #if 0 174 /* 175 * Copy the BPB and the partition table from the original MBR to the 176 * temporary buffer so that they're written back to the fs. 177 */ 178 if (bpbsize != 0) { 179 if (params->flags & IB_VERBOSE) 180 printf("Preserving %d (%#x) bytes of the BPB\n", 181 bpbsize, bpbsize); 182 (void)memcpy(bootstrapbuf + MBR_BPB_OFFSET, &mbr.mbr_bpb, 183 bpbsize); 184 } 185 #endif 186 memcpy(bootstrapbuf + MBR_PART_OFFSET, &mbr.mbr_parts, 187 sizeof(mbr.mbr_parts)); 188 189 /* 190 * Fill in any user-specified options into the 191 * struct landisk_boot_params 192 * that's 8 bytes in from the start of the third sector. 193 * See sys/arch/landisk/stand/bootxx/bootxx.S for more information. 194 */ 195 bpp = (void *)(bootstrapbuf + 512 * 2 + 8); 196 bplen = le32toh(bpp->bp_length); 197 if (bplen > sizeof bp) 198 /* Ignore pad space in bootxx */ 199 bplen = sizeof bp; 200 /* Take (and update) local copy so we handle size mismatches */ 201 memset(&bp, 0, sizeof bp); 202 memcpy(&bp, bpp, bplen); 203 if (params->flags & IB_TIMEOUT) 204 bp.bp_timeout = htole32(params->timeout); 205 /* Check we aren't trying to set anything we can't save */ 206 if (bplen < sizeof bp && memcmp((char *)&bp + bplen, 207 (char *)&bp + bplen + 1, 208 sizeof bp - bplen - 1) != 0) { 209 warnx("Patch area in stage1 bootstrap is too small"); 210 goto done; 211 } 212 memcpy(bpp, &bp, bplen); 213 214 if (params->flags & IB_NOWRITE) { 215 retval = 1; 216 goto done; 217 } 218 219 /* 220 * Write MBR code to sector zero. 221 */ 222 rv = pwrite(params->fsfd, bootstrapbuf, 512, 0); 223 if (rv == -1) { 224 warn("Writing `%s'", params->filesystem); 225 goto done; 226 } else if (rv != 512) { 227 warnx("Writing `%s': short write", params->filesystem); 228 goto done; 229 } 230 231 /* 232 * Skip disklabel in sector 1 and write bootxx to sectors 2..N. 233 */ 234 rv = pwrite(params->fsfd, bootstrapbuf + 512 * 2, 235 bootstrapsize - 512 * 2, 512 * 2); 236 if (rv == -1) { 237 warn("Writing `%s'", params->filesystem); 238 goto done; 239 } else if ((size_t)rv != bootstrapsize - 512 * 2) { 240 warnx("Writing `%s': short write", params->filesystem); 241 goto done; 242 } 243 244 retval = 1; 245 246 done: 247 if (bootstrapbuf) 248 free(bootstrapbuf); 249 return retval; 250 } 251