diff options
Diffstat (limited to 'grub-core/partmap/bsdlabel.c')
| -rw-r--r-- | grub-core/partmap/bsdlabel.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/grub-core/partmap/bsdlabel.c b/grub-core/partmap/bsdlabel.c new file mode 100644 index 0000000..888100a --- /dev/null +++ b/grub-core/partmap/bsdlabel.c @@ -0,0 +1,254 @@ +/* bsdlabel.c - Read BSD style partition tables. */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/partition.h> +#include <grub/bsdlabel.h> +#include <grub/disk.h> +#include <grub/mm.h> +#include <grub/misc.h> +#include <grub/dl.h> +#include <grub/msdos_partition.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +#ifdef GRUB_UTIL +#include <grub/emu/misc.h> +#endif + +static struct grub_partition_map grub_bsdlabel_partition_map; +static struct grub_partition_map grub_netbsdlabel_partition_map; +static struct grub_partition_map grub_openbsdlabel_partition_map; + + + +static grub_err_t +iterate_real (grub_disk_t disk, grub_disk_addr_t sector, int freebsd, + struct grub_partition_map *pmap, + int (*hook) (grub_disk_t disk, + const grub_partition_t partition)) +{ + struct grub_partition_bsd_disk_label label; + struct grub_partition p; + grub_disk_addr_t delta = 0; + grub_disk_addr_t pos; + + /* Read the BSD label. */ + if (grub_disk_read (disk, sector, 0, sizeof (label), &label)) + return grub_errno; + + /* Check if it is valid. */ + if (label.magic != grub_cpu_to_le32 (GRUB_PC_PARTITION_BSD_LABEL_MAGIC)) + return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature"); + + /* A kludge to determine a base of be.offset. */ + if (GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION + < grub_cpu_to_le16 (label.num_partitions) && freebsd) + { + struct grub_partition_bsd_entry whole_disk_be; + + pos = sizeof (label) + sector * GRUB_DISK_SECTOR_SIZE + + sizeof (struct grub_partition_bsd_entry) + * GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION; + + if (grub_disk_read (disk, pos / GRUB_DISK_SECTOR_SIZE, + pos % GRUB_DISK_SECTOR_SIZE, sizeof (whole_disk_be), + &whole_disk_be)) + return grub_errno; + + delta = grub_le_to_cpu32 (whole_disk_be.offset); + } + + pos = sizeof (label) + sector * GRUB_DISK_SECTOR_SIZE; + + for (p.number = 0; + p.number < grub_cpu_to_le16 (label.num_partitions); + p.number++, pos += sizeof (struct grub_partition_bsd_entry)) + { + struct grub_partition_bsd_entry be; + + if (p.number == GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION) + continue; + + p.offset = pos / GRUB_DISK_SECTOR_SIZE; + p.index = pos % GRUB_DISK_SECTOR_SIZE; + + if (grub_disk_read (disk, p.offset, p.index, sizeof (be), &be)) + return grub_errno; + + p.start = grub_le_to_cpu32 (be.offset); + p.len = grub_le_to_cpu32 (be.size); + p.partmap = pmap; + + if (p.len == 0) + continue; + + if (p.start < delta) + { +#ifdef GRUB_UTIL + char *partname; + /* disk->partition != NULL as 0 < delta */ + partname = disk->partition ? grub_partition_get_name (disk->partition) + : ""; + grub_util_warn ("Discarding improperly nested partition (%s,%s,%s%d)", + disk->name, partname, p.partmap->name, p.number + 1); + grub_free (partname); +#endif + continue; + } + + p.start -= delta; + + if (hook (disk, &p)) + return grub_errno; + } + return GRUB_ERR_NONE; +} + +static grub_err_t +bsdlabel_partition_map_iterate (grub_disk_t disk, + int (*hook) (grub_disk_t disk, + const grub_partition_t partition)) +{ + + if (disk->partition && grub_strcmp (disk->partition->partmap->name, "msdos") + == 0 && disk->partition->msdostype == GRUB_PC_PARTITION_TYPE_FREEBSD) + return iterate_real (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 1, + &grub_bsdlabel_partition_map, hook); + + if (disk->partition + && (grub_strcmp (disk->partition->partmap->name, "msdos") == 0 + || disk->partition->partmap == &grub_bsdlabel_partition_map + || disk->partition->partmap == &grub_netbsdlabel_partition_map + || disk->partition->partmap == &grub_openbsdlabel_partition_map)) + return grub_error (GRUB_ERR_BAD_PART_TABLE, "no embedding supported"); + + return iterate_real (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 0, + &grub_bsdlabel_partition_map, hook); +} + +/* This is a total breakage. Even when net-/openbsd label is inside partition + it actually describes the whole disk. + */ +static grub_err_t +netopenbsdlabel_partition_map_iterate (grub_disk_t disk, grub_uint8_t type, + struct grub_partition_map *pmap, + int (*hook) (grub_disk_t disk, + const grub_partition_t partition)) +{ + int count = 0; + + auto int check_msdos (grub_disk_t dsk, + const grub_partition_t partition); + + int check_msdos (grub_disk_t dsk, + const grub_partition_t partition) + { + grub_err_t err; + + if (partition->msdostype != type) + return 0; + + err = iterate_real (dsk, partition->start + + GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 0, pmap, hook); + if (err == GRUB_ERR_NONE) + { + count++; + return 1; + } + if (err == GRUB_ERR_BAD_PART_TABLE) + { + grub_errno = GRUB_ERR_NONE; + return 0; + } + grub_print_error (); + return 0; + } + + if (disk->partition && grub_strcmp (disk->partition->partmap->name, "msdos") + == 0) + return grub_error (GRUB_ERR_BAD_PART_TABLE, "no embedding supported"); + + { + grub_err_t err; + err = grub_partition_msdos_iterate (disk, check_msdos); + + if (err) + return err; + if (!count) + return grub_error (GRUB_ERR_BAD_PART_TABLE, "no bsdlabel found"); + } + return GRUB_ERR_NONE; +} + +static grub_err_t +netbsdlabel_partition_map_iterate (grub_disk_t disk, + int (*hook) (grub_disk_t disk, + const grub_partition_t partition)) +{ + return netopenbsdlabel_partition_map_iterate (disk, + GRUB_PC_PARTITION_TYPE_NETBSD, + &grub_netbsdlabel_partition_map, + hook); +} + +static grub_err_t +openbsdlabel_partition_map_iterate (grub_disk_t disk, + int (*hook) (grub_disk_t disk, + const grub_partition_t partition)) +{ + return netopenbsdlabel_partition_map_iterate (disk, + GRUB_PC_PARTITION_TYPE_OPENBSD, + &grub_openbsdlabel_partition_map, + hook); +} + + +static struct grub_partition_map grub_bsdlabel_partition_map = + { + .name = "bsd", + .iterate = bsdlabel_partition_map_iterate, + }; + +static struct grub_partition_map grub_openbsdlabel_partition_map = + { + .name = "openbsd", + .iterate = openbsdlabel_partition_map_iterate, + }; + +static struct grub_partition_map grub_netbsdlabel_partition_map = + { + .name = "netbsd", + .iterate = netbsdlabel_partition_map_iterate, + }; + + + +GRUB_MOD_INIT(part_bsd) +{ + grub_partition_map_register (&grub_bsdlabel_partition_map); + grub_partition_map_register (&grub_netbsdlabel_partition_map); + grub_partition_map_register (&grub_openbsdlabel_partition_map); +} + +GRUB_MOD_FINI(part_bsd) +{ + grub_partition_map_unregister (&grub_bsdlabel_partition_map); + grub_partition_map_unregister (&grub_netbsdlabel_partition_map); + grub_partition_map_unregister (&grub_openbsdlabel_partition_map); +} |