mirror of
https://git.proxmox.com/git/grub2
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272 lines
7.6 KiB
C
272 lines
7.6 KiB
C
/* bsdlabel.c - Read BSD style partition tables. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/partition.h>
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#include <grub/bsdlabel.h>
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#include <grub/disk.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/dl.h>
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#include <grub/msdos_partition.h>
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#include <grub/i18n.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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#ifdef GRUB_UTIL
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#include <grub/emu/misc.h>
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#endif
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static struct grub_partition_map grub_bsdlabel_partition_map;
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static struct grub_partition_map grub_netbsdlabel_partition_map;
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static struct grub_partition_map grub_openbsdlabel_partition_map;
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static grub_err_t
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iterate_real (grub_disk_t disk, grub_disk_addr_t sector, int freebsd,
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struct grub_partition_map *pmap,
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grub_partition_iterate_hook_t hook, void *hook_data)
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{
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struct grub_partition_bsd_disk_label label;
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struct grub_partition p;
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grub_disk_addr_t delta = 0;
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grub_disk_addr_t pos;
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/* Read the BSD label. */
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if (grub_disk_read (disk, sector, 0, sizeof (label), &label))
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return grub_errno;
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/* Check if it is valid. */
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if (label.magic != grub_cpu_to_le32 (GRUB_PC_PARTITION_BSD_LABEL_MAGIC))
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature");
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/* A kludge to determine a base of be.offset. */
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if (GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION
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< grub_cpu_to_le16 (label.num_partitions) && freebsd)
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{
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struct grub_partition_bsd_entry whole_disk_be;
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pos = sizeof (label) + sector * GRUB_DISK_SECTOR_SIZE
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+ sizeof (struct grub_partition_bsd_entry)
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* GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION;
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if (grub_disk_read (disk, pos / GRUB_DISK_SECTOR_SIZE,
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pos % GRUB_DISK_SECTOR_SIZE, sizeof (whole_disk_be),
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&whole_disk_be))
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return grub_errno;
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delta = grub_le_to_cpu32 (whole_disk_be.offset);
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}
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pos = sizeof (label) + sector * GRUB_DISK_SECTOR_SIZE;
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for (p.number = 0;
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p.number < grub_cpu_to_le16 (label.num_partitions);
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p.number++, pos += sizeof (struct grub_partition_bsd_entry))
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{
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struct grub_partition_bsd_entry be;
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if (p.number == GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION)
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continue;
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p.offset = pos / GRUB_DISK_SECTOR_SIZE;
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p.index = pos % GRUB_DISK_SECTOR_SIZE;
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if (grub_disk_read (disk, p.offset, p.index, sizeof (be), &be))
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return grub_errno;
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p.start = grub_le_to_cpu32 (be.offset);
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p.len = grub_le_to_cpu32 (be.size);
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p.partmap = pmap;
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if (p.len == 0)
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continue;
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if (p.start < delta)
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{
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#ifdef GRUB_UTIL
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char *partname;
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/* disk->partition != NULL as 0 < delta */
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partname = disk->partition ? grub_partition_get_name (disk->partition)
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: 0;
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grub_util_warn (_("Discarding improperly nested partition (%s,%s,%s%d)"),
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disk->name, partname ? : "", p.partmap->name,
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p.number + 1);
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grub_free (partname);
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#endif
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continue;
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}
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p.start -= delta;
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if (hook (disk, &p, hook_data))
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return grub_errno;
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}
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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bsdlabel_partition_map_iterate (grub_disk_t disk,
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grub_partition_iterate_hook_t hook,
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void *hook_data)
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{
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if (disk->partition && grub_strcmp (disk->partition->partmap->name, "msdos")
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== 0 && disk->partition->msdostype == GRUB_PC_PARTITION_TYPE_FREEBSD)
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return iterate_real (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 1,
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&grub_bsdlabel_partition_map, hook, hook_data);
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if (disk->partition
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&& (grub_strcmp (disk->partition->partmap->name, "msdos") == 0
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|| disk->partition->partmap == &grub_bsdlabel_partition_map
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|| disk->partition->partmap == &grub_netbsdlabel_partition_map
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|| disk->partition->partmap == &grub_openbsdlabel_partition_map))
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "no embedding supported");
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return iterate_real (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 0,
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&grub_bsdlabel_partition_map, hook, hook_data);
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}
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/* Context for netopenbsdlabel_partition_map_iterate. */
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struct netopenbsdlabel_ctx
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{
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grub_uint8_t type;
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struct grub_partition_map *pmap;
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grub_partition_iterate_hook_t hook;
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void *hook_data;
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int count;
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};
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/* Helper for netopenbsdlabel_partition_map_iterate. */
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static int
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check_msdos (grub_disk_t dsk, const grub_partition_t partition, void *data)
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{
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struct netopenbsdlabel_ctx *ctx = data;
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grub_err_t err;
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if (partition->msdostype != ctx->type)
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return 0;
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err = iterate_real (dsk, partition->start
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+ GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 0, ctx->pmap,
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ctx->hook, ctx->hook_data);
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if (err == GRUB_ERR_NONE)
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{
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ctx->count++;
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return 1;
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}
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if (err == GRUB_ERR_BAD_PART_TABLE)
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{
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grub_errno = GRUB_ERR_NONE;
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return 0;
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}
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grub_print_error ();
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return 0;
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}
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/* This is a total breakage. Even when net-/openbsd label is inside partition
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it actually describes the whole disk.
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*/
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static grub_err_t
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netopenbsdlabel_partition_map_iterate (grub_disk_t disk, grub_uint8_t type,
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struct grub_partition_map *pmap,
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grub_partition_iterate_hook_t hook,
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void *hook_data)
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{
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if (disk->partition && grub_strcmp (disk->partition->partmap->name, "msdos")
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== 0)
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "no embedding supported");
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{
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struct netopenbsdlabel_ctx ctx = {
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.type = type,
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.pmap = pmap,
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.hook = hook,
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.hook_data = hook_data,
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.count = 0
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};
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grub_err_t err;
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err = grub_partition_msdos_iterate (disk, check_msdos, &ctx);
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if (err)
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return err;
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if (!ctx.count)
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "no bsdlabel found");
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}
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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netbsdlabel_partition_map_iterate (grub_disk_t disk,
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grub_partition_iterate_hook_t hook,
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void *hook_data)
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{
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return netopenbsdlabel_partition_map_iterate (disk,
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GRUB_PC_PARTITION_TYPE_NETBSD,
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&grub_netbsdlabel_partition_map,
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hook, hook_data);
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}
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static grub_err_t
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openbsdlabel_partition_map_iterate (grub_disk_t disk,
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grub_partition_iterate_hook_t hook,
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void *hook_data)
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{
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return netopenbsdlabel_partition_map_iterate (disk,
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GRUB_PC_PARTITION_TYPE_OPENBSD,
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&grub_openbsdlabel_partition_map,
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hook, hook_data);
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}
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static struct grub_partition_map grub_bsdlabel_partition_map =
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{
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.name = "bsd",
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.iterate = bsdlabel_partition_map_iterate,
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};
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static struct grub_partition_map grub_openbsdlabel_partition_map =
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{
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.name = "openbsd",
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.iterate = openbsdlabel_partition_map_iterate,
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};
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static struct grub_partition_map grub_netbsdlabel_partition_map =
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{
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.name = "netbsd",
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.iterate = netbsdlabel_partition_map_iterate,
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};
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GRUB_MOD_INIT(part_bsd)
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{
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grub_partition_map_register (&grub_bsdlabel_partition_map);
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grub_partition_map_register (&grub_netbsdlabel_partition_map);
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grub_partition_map_register (&grub_openbsdlabel_partition_map);
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}
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GRUB_MOD_FINI(part_bsd)
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{
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grub_partition_map_unregister (&grub_bsdlabel_partition_map);
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grub_partition_map_unregister (&grub_netbsdlabel_partition_map);
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grub_partition_map_unregister (&grub_openbsdlabel_partition_map);
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}
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