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https://github.com/freebsd/freebsd-src
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9b42d3e12f
UEFI v2.10 Section 5.3 documentes that the minimum reserved space after the GPT header be at least 16kB. Enforce this minimum. Before, we'd only set the number of entries to be the unpadded size. gpart's selective enforcement of aspects of the GPT standard meant that these images would work, but couldn't be changed (to add a partition or grow the size of a partition). This ensures that gpart's overly picky standards don't cause problems for people wishing to, for example, resize release images. MFC after: 1 day (we want this in 14.0) PR: 274312 Sponsored by: Netflix Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D42245
297 lines
10 KiB
C
297 lines
10 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/param.h>
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#include <sys/errno.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 <gpt.h>
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#include <mbr.h>
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#include "endian.h"
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#include "image.h"
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#include "mkimg.h"
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#include "scheme.h"
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static mkimg_uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI;
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static mkimg_uuid_t gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD;
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static mkimg_uuid_t gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT;
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static mkimg_uuid_t gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS;
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static mkimg_uuid_t gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP;
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static mkimg_uuid_t gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS;
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static mkimg_uuid_t gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM;
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static mkimg_uuid_t gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS;
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static mkimg_uuid_t gpt_uuid_mbr = GPT_ENT_TYPE_MBR;
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static mkimg_uuid_t gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA;
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static mkimg_uuid_t gpt_uuid_prep_boot = GPT_ENT_TYPE_PREP_BOOT;
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static struct mkimg_alias gpt_aliases[] = {
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{ ALIAS_EFI, ALIAS_PTR2TYPE(&gpt_uuid_efi) },
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{ ALIAS_FREEBSD, ALIAS_PTR2TYPE(&gpt_uuid_freebsd) },
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{ ALIAS_FREEBSD_BOOT, ALIAS_PTR2TYPE(&gpt_uuid_freebsd_boot) },
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{ ALIAS_FREEBSD_NANDFS, ALIAS_PTR2TYPE(&gpt_uuid_freebsd_nandfs) },
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{ ALIAS_FREEBSD_SWAP, ALIAS_PTR2TYPE(&gpt_uuid_freebsd_swap) },
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{ ALIAS_FREEBSD_UFS, ALIAS_PTR2TYPE(&gpt_uuid_freebsd_ufs) },
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{ ALIAS_FREEBSD_VINUM, ALIAS_PTR2TYPE(&gpt_uuid_freebsd_vinum) },
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{ ALIAS_FREEBSD_ZFS, ALIAS_PTR2TYPE(&gpt_uuid_freebsd_zfs) },
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{ ALIAS_MBR, ALIAS_PTR2TYPE(&gpt_uuid_mbr) },
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{ ALIAS_NTFS, ALIAS_PTR2TYPE(&gpt_uuid_ms_basic_data) },
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{ ALIAS_PPCBOOT, ALIAS_PTR2TYPE(&gpt_uuid_prep_boot) },
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{ ALIAS_NONE, 0 } /* Keep last! */
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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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/*
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* Return the number of sectors needed to store the partition table.
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*/
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static u_int
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gpt_tblsz(void)
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{
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u_int eps; /* Entries per Sector */
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/*
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* Count the number of sectors needed for the GPT Entry Array to store
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* the number of partitions defined for this image. Enforce the 16kB
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* minimum space for the GPT Entry Array per UEFI v2.10 Section 5.3.
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*/
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eps = secsz / sizeof(struct gpt_ent);
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return (MAX(howmany(GPT_MIN_RESERVED, secsz), howmany(nparts, eps)));
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}
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static lba_t
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gpt_metadata(u_int where, lba_t blk)
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{
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if (where == SCHEME_META_IMG_START || where == SCHEME_META_IMG_END) {
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blk += gpt_tblsz();
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blk += (where == SCHEME_META_IMG_START) ? 2 : 1;
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}
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return (round_block(blk));
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}
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static int
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gpt_write_pmbr(lba_t blks, void *bootcode)
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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 = (blks > UINT32_MAX) ? UINT32_MAX : (uint32_t)blks - 1;
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pmbr = malloc(secsz);
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if (pmbr == NULL)
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return (errno);
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if (bootcode != NULL) {
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memcpy(pmbr, bootcode, DOSPARTOFF);
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memset(pmbr + DOSPARTOFF, 0, secsz - DOSPARTOFF);
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} else
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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 = image_write(0, pmbr, 1);
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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)
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{
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mkimg_uuid_t uuid;
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struct gpt_ent *tbl, *ent;
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struct part *part;
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int c, idx;
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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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TAILQ_FOREACH(part, &partlist, link) {
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ent = tbl + part->index;
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mkimg_uuid_enc(&ent->ent_type, ALIAS_TYPE2PTR(part->type));
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mkimg_uuid(&uuid);
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mkimg_uuid_enc(&ent->ent_uuid, &uuid);
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le64enc(&ent->ent_lba_start, part->block);
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le64enc(&ent->ent_lba_end, part->block + part->size - 1);
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if (part->label != NULL) {
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idx = 0;
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while ((c = part->label[idx]) != '\0') {
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le16enc(ent->ent_name + idx, c);
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idx++;
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}
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}
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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(struct gpt_hdr *hdr, uint64_t self, uint64_t alt, uint64_t tbl)
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{
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uint32_t crc;
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le64enc(&hdr->hdr_lba_self, self);
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le64enc(&hdr->hdr_lba_alt, alt);
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le64enc(&hdr->hdr_lba_table, tbl);
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hdr->hdr_crc_self = 0;
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crc = crc32(hdr, offsetof(struct gpt_hdr, padding));
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le64enc(&hdr->hdr_crc_self, crc);
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return (image_write(self, hdr, 1));
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}
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static int
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gpt_write(lba_t imgsz, void *bootcode)
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{
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mkimg_uuid_t uuid;
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struct gpt_ent *tbl;
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struct gpt_hdr *hdr;
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uint32_t crc;
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u_int tblsz;
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int error;
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/* PMBR */
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error = gpt_write_pmbr(imgsz, bootcode);
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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();
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tbl = gpt_mktbl(tblsz);
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if (tbl == NULL)
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return (errno);
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error = image_write(2, tbl, tblsz);
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if (error)
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goto out;
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error = image_write(imgsz - (tblsz + 1), tbl, tblsz);
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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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le32enc(&hdr->hdr_revision, GPT_HDR_REVISION);
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le32enc(&hdr->hdr_size, offsetof(struct gpt_hdr, padding));
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le64enc(&hdr->hdr_lba_start, 2 + tblsz);
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le64enc(&hdr->hdr_lba_end, imgsz - tblsz - 2);
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mkimg_uuid(&uuid);
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mkimg_uuid_enc(&hdr->hdr_uuid, &uuid);
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le32enc(&hdr->hdr_entries, tblsz * secsz / sizeof(struct gpt_ent));
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le32enc(&hdr->hdr_entsz, sizeof(struct gpt_ent));
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crc = crc32(tbl, tblsz * secsz);
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le32enc(&hdr->hdr_crc_table, crc);
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error = gpt_write_hdr(hdr, 1, imgsz - 1, 2);
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if (!error)
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error = gpt_write_hdr(hdr, imgsz - 1, 1, imgsz - tblsz - 1);
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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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.labellen = 36,
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.bootcode = 512,
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.maxsecsz = 4096
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};
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SCHEME_DEFINE(gpt_scheme);
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