d8d97191a5
1. Fix copy-paste bug that resulted in not sizing the image correctly
for the secondary header and table.
2. The hdr_lba_end field in the header is the LBA of the last usable
sector, not the one after it.
While here, fix a white-space nit.
272 lines
8.7 KiB
C
272 lines
8.7 KiB
C
/*-
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* Copyright (c) 2014 Juniper Networks, Inc.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/diskmbr.h>
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#include <sys/endian.h>
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#include <sys/errno.h>
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#include <sys/gpt.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <uuid.h>
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#include "mkimg.h"
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#include "scheme.h"
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static uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI;
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static struct mkimg_alias gpt_aliases[] = {
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{ "efi", ALIAS_PTR2TYPE(&gpt_uuid_efi) },
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{ NULL, 0 }
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};
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/* CRC32 code derived from work by Gary S. Brown. */
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static const uint32_t crc32_tab[] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
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0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
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0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
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0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
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0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
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0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
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0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
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0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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static uint32_t
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crc32(const void *buf, size_t sz)
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{
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const uint8_t *p = (const uint8_t *)buf;
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uint32_t crc = ~0U;
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while (sz--)
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crc = crc32_tab[(crc ^ *p++) & 0xff] ^ (crc >> 8);
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return (crc ^ ~0U);
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}
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static u_int
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gpt_tblsz(u_int parts, u_int secsz)
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{
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u_int ents;
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ents = secsz / sizeof(struct gpt_ent);
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return ((parts + ents - 1) / ents);
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}
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static u_int
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gpt_metadata(u_int where, u_int parts, u_int secsz)
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{
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u_int secs;
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if (where != SCHEME_META_IMG_START && where != SCHEME_META_IMG_END)
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return (0);
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secs = gpt_tblsz(parts, secsz);
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secs += (where == SCHEME_META_IMG_START) ? 2 : 1;
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return (secs);
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}
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static int
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gpt_filewrite(int fd, off_t ofs, void *buf, ssize_t bufsz)
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{
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if (lseek(fd, ofs, SEEK_SET) != ofs)
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return (errno);
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if (write(fd, buf, bufsz) != bufsz)
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return (errno);
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return (0);
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}
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static int
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gpt_write_pmbr(int fd, off_t nblocks, u_int secsz)
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{
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u_char *pmbr;
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uint32_t secs;
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int error;
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secs = (nblocks > UINT32_MAX) ? UINT32_MAX : nblocks;
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pmbr = malloc(secsz);
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if (pmbr == NULL)
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return (errno);
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memset(pmbr, 0, secsz);
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pmbr[DOSPARTOFF + 2] = 2;
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pmbr[DOSPARTOFF + 4] = 0xee;
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pmbr[DOSPARTOFF + 5] = 0xff;
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pmbr[DOSPARTOFF + 6] = 0xff;
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pmbr[DOSPARTOFF + 7] = 0xff;
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le32enc(pmbr + DOSPARTOFF + 8, 1);
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le32enc(pmbr + DOSPARTOFF + 12, secs);
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le16enc(pmbr + DOSMAGICOFFSET, DOSMAGIC);
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error = gpt_filewrite(fd, 0, pmbr, secsz);
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free(pmbr);
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return (error);
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}
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static struct gpt_ent *
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gpt_mktbl(u_int tblsz, u_int secsz)
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{
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struct gpt_ent *tbl, *ent;
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struct part *part;
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uint64_t partsize;
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tbl = calloc(tblsz, secsz);
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if (tbl == NULL)
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return (NULL);
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STAILQ_FOREACH(part, &partlist, link) {
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ent = tbl + part->index;
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memcpy(&ent->ent_type, ALIAS_TYPE2PTR(part->type),
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sizeof(uuid_t));
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uuidgen(&ent->ent_uuid, 1);
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ent->ent_lba_start = part->offset / secsz;
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partsize = part->size / secsz;
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ent->ent_lba_end = ent->ent_lba_start + partsize - 1;
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/* TODO add support for labels */
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}
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return (tbl);
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}
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static int
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gpt_write_hdr(int fd, struct gpt_hdr *hdr, uint64_t self, uint64_t alt,
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uint64_t tbl, u_int secsz)
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{
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hdr->hdr_lba_self = self;
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hdr->hdr_lba_alt = alt;
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hdr->hdr_lba_table = tbl;
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hdr->hdr_crc_self = 0;
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hdr->hdr_crc_self = crc32(hdr, hdr->hdr_size);
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return (gpt_filewrite(fd, self * secsz, hdr, secsz));
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}
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static int
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gpt_write(int fd, off_t imgsz, u_int parts, u_int secsz)
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{
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struct gpt_ent *tbl;
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struct gpt_hdr *hdr;
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off_t nblocks;
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u_int tblsz;
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int error;
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nblocks = imgsz / secsz;
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/* PMBR */
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error = gpt_write_pmbr(fd, nblocks, secsz);
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if (error)
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return (error);
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/* GPT table(s) */
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tblsz = gpt_tblsz(parts, secsz);
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tbl = gpt_mktbl(tblsz, secsz);
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if (tbl == NULL)
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return (errno);
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error = gpt_filewrite(fd, 2 * secsz, tbl, tblsz * secsz);
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if (error)
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goto out;
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error = gpt_filewrite(fd, imgsz - (tblsz + 1) * secsz, tbl,
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tblsz * secsz);
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if (error)
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goto out;
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/* GPT header(s) */
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hdr = malloc(secsz);
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if (hdr == NULL) {
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error = errno;
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goto out;
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}
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memset(hdr, 0, secsz);
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memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig));
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hdr->hdr_revision = GPT_HDR_REVISION;
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hdr->hdr_size = offsetof(struct gpt_hdr, padding);
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hdr->hdr_lba_start = 2 + tblsz;
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hdr->hdr_lba_end = nblocks - tblsz - 2;
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uuidgen(&hdr->hdr_uuid, 1);
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hdr->hdr_entries = parts;
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hdr->hdr_entsz = sizeof(struct gpt_ent);
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hdr->hdr_crc_table = crc32(tbl, hdr->hdr_entries * hdr->hdr_entsz);
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error = gpt_write_hdr(fd, hdr, 1, nblocks - 1, 2, secsz);
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if (!error)
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error = gpt_write_hdr(fd, hdr, nblocks - 1, 1,
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nblocks - tblsz - 1, secsz);
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free(hdr);
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out:
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free(tbl);
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return (error);
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}
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static struct mkimg_scheme gpt_scheme = {
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.name = "gpt",
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.description = "GUID Partition Table",
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.aliases = gpt_aliases,
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.metadata = gpt_metadata,
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.write = gpt_write,
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.nparts = 4096
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};
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SCHEME_DEFINE(gpt_scheme);
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