115c2cc180
an Acer registration utility with several sightings in the wild. Reported by: Rickard Westman. Fixes Ubuntu bug #987022.
425 lines
12 KiB
C
425 lines
12 KiB
C
/* pc.c - Read PC 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/msdos_partition.h>
|
||
#include <grub/disk.h>
|
||
#include <grub/mm.h>
|
||
#include <grub/misc.h>
|
||
#include <grub/dl.h>
|
||
#include <grub/i18n.h>
|
||
|
||
GRUB_MOD_LICENSE ("GPLv3+");
|
||
|
||
static struct grub_partition_map grub_msdos_partition_map;
|
||
|
||
|
||
#ifdef GRUB_UTIL
|
||
#include <grub/emu/misc.h>
|
||
|
||
struct embed_signature
|
||
{
|
||
const char *name;
|
||
const char *signature;
|
||
int signature_len;
|
||
enum { TYPE_SOFTWARE, TYPE_RAID } type;
|
||
};
|
||
|
||
const char message_warn[][200] = {
|
||
/* TRANSLATORS: MBR gap and boot track is the same thing and is the space
|
||
between MBR and first partitition. If your language translates well only
|
||
"boot track", you can just use it everywhere. Next two messages are about
|
||
RAID controllers/software bugs which GRUB has to live with. Please spread
|
||
the message that these are bugs in other software and not merely
|
||
suboptimal behaviour. */
|
||
[TYPE_RAID] = N_("Sector %llu is already in use by raid controller `%s';"
|
||
" avoiding it. "
|
||
"Please ask the manufacturer not to store data in MBR gap"),
|
||
[TYPE_SOFTWARE] = N_("Sector %llu is already in use by the program `%s';"
|
||
" avoiding it. "
|
||
"This software may cause boot or other problems in "
|
||
"future. Please ask its authors not to store data "
|
||
"in the boot track")
|
||
};
|
||
|
||
|
||
/* Signatures of other software that may be using sectors in the embedding
|
||
area. */
|
||
struct embed_signature embed_signatures[] =
|
||
{
|
||
{
|
||
.name = "ZISD",
|
||
.signature = "ZISD",
|
||
.signature_len = 4,
|
||
.type = TYPE_SOFTWARE
|
||
},
|
||
{
|
||
.name = "FlexNet",
|
||
.signature = "\xd4\x41\xa0\xf5\x03\x00\x03\x00",
|
||
.signature_len = 8,
|
||
.type = TYPE_SOFTWARE
|
||
},
|
||
{
|
||
.name = "FlexNet",
|
||
.signature = "\xd8\x41\xa0\xf5\x02\x00\x02\x00",
|
||
.signature_len = 8,
|
||
.type = TYPE_SOFTWARE
|
||
},
|
||
{
|
||
/* from Ryan Perkins */
|
||
.name = "HP Backup and Recovery Manager (?)",
|
||
.signature = "\x70\x8a\x5d\x46\x35\xc5\x1b\x93"
|
||
"\xae\x3d\x86\xfd\xb1\x55\x3e\xe0",
|
||
.signature_len = 16,
|
||
.type = TYPE_SOFTWARE
|
||
},
|
||
{
|
||
.name = "HighPoint RAID controller",
|
||
.signature = "ycgl",
|
||
.signature_len = 4,
|
||
.type = TYPE_RAID
|
||
},
|
||
{
|
||
/* https://bugs.launchpad.net/bugs/987022 */
|
||
.name = "Acer registration utility (?)",
|
||
.signature = "GREGRegDone.Tag\x00",
|
||
.signature_len = 16,
|
||
.type = TYPE_SOFTWARE
|
||
}
|
||
};
|
||
#endif
|
||
|
||
grub_err_t
|
||
grub_partition_msdos_iterate (grub_disk_t disk,
|
||
grub_partition_iterate_hook_t hook,
|
||
void *hook_data)
|
||
{
|
||
struct grub_partition p;
|
||
struct grub_msdos_partition_mbr mbr;
|
||
int labeln = 0;
|
||
grub_disk_addr_t lastaddr;
|
||
grub_disk_addr_t ext_offset;
|
||
grub_disk_addr_t delta = 0;
|
||
|
||
if (disk->partition && disk->partition->partmap == &grub_msdos_partition_map)
|
||
{
|
||
if (disk->partition->msdostype == GRUB_PC_PARTITION_TYPE_LINUX_MINIX)
|
||
delta = disk->partition->start;
|
||
else
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no embedding supported");
|
||
}
|
||
|
||
p.offset = 0;
|
||
ext_offset = 0;
|
||
p.number = -1;
|
||
p.partmap = &grub_msdos_partition_map;
|
||
|
||
/* Any value different than `p.offset' will satisfy the check during
|
||
first loop. */
|
||
lastaddr = !p.offset;
|
||
|
||
while (1)
|
||
{
|
||
int i;
|
||
struct grub_msdos_partition_entry *e;
|
||
|
||
/* Read the MBR. */
|
||
if (grub_disk_read (disk, p.offset, 0, sizeof (mbr), &mbr))
|
||
goto finish;
|
||
|
||
/* If this is a GPT partition, this MBR is just a dummy. */
|
||
if (p.offset == 0)
|
||
for (i = 0; i < 4; i++)
|
||
if (mbr.entries[i].type == GRUB_PC_PARTITION_TYPE_GPT_DISK)
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "dummy mbr");
|
||
|
||
/* This is our loop-detection algorithm. It works the following way:
|
||
It saves last position which was a power of two. Then it compares the
|
||
saved value with a current one. This way it's guaranteed that the loop
|
||
will be broken by at most third walk.
|
||
*/
|
||
if (labeln && lastaddr == p.offset)
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "loop detected");
|
||
|
||
labeln++;
|
||
if ((labeln & (labeln - 1)) == 0)
|
||
lastaddr = p.offset;
|
||
|
||
/* Check if it is valid. */
|
||
if (mbr.signature != grub_cpu_to_le16 (GRUB_PC_PARTITION_SIGNATURE))
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature");
|
||
|
||
for (i = 0; i < 4; i++)
|
||
if (mbr.entries[i].flag & 0x7f)
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "bad boot flag");
|
||
|
||
/* Analyze DOS partitions. */
|
||
for (p.index = 0; p.index < 4; p.index++)
|
||
{
|
||
e = mbr.entries + p.index;
|
||
|
||
p.start = p.offset
|
||
+ (grub_le_to_cpu32 (e->start)
|
||
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS)) - delta;
|
||
p.len = grub_le_to_cpu32 (e->length)
|
||
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS);
|
||
p.msdostype = e->type;
|
||
|
||
grub_dprintf ("partition",
|
||
"partition %d: flag 0x%x, type 0x%x, start 0x%llx, len 0x%llx\n",
|
||
p.index, e->flag, e->type,
|
||
(unsigned long long) p.start,
|
||
(unsigned long long) p.len);
|
||
|
||
/* If this partition is a normal one, call the hook. */
|
||
if (! grub_msdos_partition_is_empty (e->type)
|
||
&& ! grub_msdos_partition_is_extended (e->type))
|
||
{
|
||
p.number++;
|
||
|
||
if (hook (disk, &p, hook_data))
|
||
return grub_errno;
|
||
}
|
||
else if (p.number < 4)
|
||
/* If this partition is a logical one, shouldn't increase the
|
||
partition number. */
|
||
p.number++;
|
||
}
|
||
|
||
/* Find an extended partition. */
|
||
for (i = 0; i < 4; i++)
|
||
{
|
||
e = mbr.entries + i;
|
||
|
||
if (grub_msdos_partition_is_extended (e->type))
|
||
{
|
||
p.offset = ext_offset
|
||
+ (grub_le_to_cpu32 (e->start)
|
||
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS));
|
||
if (! ext_offset)
|
||
ext_offset = p.offset;
|
||
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* If no extended partition, the end. */
|
||
if (i == 4)
|
||
break;
|
||
}
|
||
|
||
finish:
|
||
return grub_errno;
|
||
}
|
||
|
||
#ifdef GRUB_UTIL
|
||
static grub_err_t
|
||
pc_partition_map_embed (struct grub_disk *disk, unsigned int *nsectors,
|
||
unsigned int max_nsectors,
|
||
grub_embed_type_t embed_type,
|
||
grub_disk_addr_t **sectors)
|
||
{
|
||
grub_disk_addr_t end = ~0ULL;
|
||
struct grub_msdos_partition_mbr mbr;
|
||
int labeln = 0;
|
||
/* Any value different than `p.offset' will satisfy the check during
|
||
first loop. */
|
||
grub_disk_addr_t lastaddr = 1;
|
||
grub_disk_addr_t ext_offset = 0;
|
||
grub_disk_addr_t offset = 0;
|
||
|
||
if (embed_type != GRUB_EMBED_PCBIOS)
|
||
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
|
||
"PC-style partitions curently support "
|
||
"only PC-BIOS embedding");
|
||
|
||
if (disk->partition)
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
"Embedding on MSDOS subpartition isn't supported");
|
||
|
||
while (1)
|
||
{
|
||
int i;
|
||
struct grub_msdos_partition_entry *e;
|
||
grub_err_t err;
|
||
|
||
/* Read the MBR. */
|
||
err = grub_disk_read (disk, offset, 0, sizeof (mbr), &mbr);
|
||
if (err)
|
||
return err;
|
||
|
||
/* This is our loop-detection algorithm. It works the following way:
|
||
It saves last position which was a power of two. Then it compares the
|
||
saved value with a current one. This way it's guaranteed that the loop
|
||
will be broken by at most third walk.
|
||
*/
|
||
if (labeln && lastaddr == offset)
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "loop detected");
|
||
|
||
labeln++;
|
||
if ((labeln & (labeln - 1)) == 0)
|
||
lastaddr = offset;
|
||
|
||
/* Check if it is valid. */
|
||
if (mbr.signature != grub_cpu_to_le16 (GRUB_PC_PARTITION_SIGNATURE))
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature");
|
||
|
||
for (i = 0; i < 4; i++)
|
||
if (mbr.entries[i].flag & 0x7f)
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "bad boot flag");
|
||
|
||
/* Analyze DOS partitions. */
|
||
for (i = 0; i < 4; i++)
|
||
{
|
||
e = mbr.entries + i;
|
||
|
||
if (!grub_msdos_partition_is_empty (e->type)
|
||
&& end > offset
|
||
+ (grub_le_to_cpu32 (e->start)
|
||
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS)))
|
||
end = offset + (grub_le_to_cpu32 (e->start)
|
||
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS));
|
||
|
||
/* If this is a GPT partition, this MBR is just a dummy. */
|
||
if (e->type == GRUB_PC_PARTITION_TYPE_GPT_DISK && i == 0)
|
||
return grub_error (GRUB_ERR_BAD_PART_TABLE, "dummy mbr");
|
||
}
|
||
|
||
/* Find an extended partition. */
|
||
for (i = 0; i < 4; i++)
|
||
{
|
||
e = mbr.entries + i;
|
||
|
||
if (grub_msdos_partition_is_extended (e->type))
|
||
{
|
||
offset = ext_offset
|
||
+ (grub_le_to_cpu32 (e->start)
|
||
<< (disk->log_sector_size - GRUB_DISK_SECTOR_BITS));
|
||
if (! ext_offset)
|
||
ext_offset = offset;
|
||
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* If no extended partition, the end. */
|
||
if (i == 4)
|
||
break;
|
||
}
|
||
|
||
if (end >= *nsectors + 1)
|
||
{
|
||
unsigned i, j;
|
||
char *embed_signature_check;
|
||
unsigned int orig_nsectors, avail_nsectors;
|
||
|
||
orig_nsectors = *nsectors;
|
||
*nsectors = end - 1;
|
||
avail_nsectors = *nsectors;
|
||
if (*nsectors > max_nsectors)
|
||
*nsectors = max_nsectors;
|
||
*sectors = grub_malloc (*nsectors * sizeof (**sectors));
|
||
if (!*sectors)
|
||
return grub_errno;
|
||
for (i = 0; i < *nsectors; i++)
|
||
(*sectors)[i] = 1 + i;
|
||
|
||
/* Check for software that is already using parts of the embedding
|
||
* area.
|
||
*/
|
||
embed_signature_check = grub_malloc (GRUB_DISK_SECTOR_SIZE);
|
||
for (i = 0; i < *nsectors; i++)
|
||
{
|
||
if (grub_disk_read (disk, (*sectors)[i], 0, GRUB_DISK_SECTOR_SIZE,
|
||
embed_signature_check))
|
||
continue;
|
||
|
||
for (j = 0; j < ARRAY_SIZE (embed_signatures); j++)
|
||
if (! grub_memcmp (embed_signatures[j].signature,
|
||
embed_signature_check,
|
||
embed_signatures[j].signature_len))
|
||
break;
|
||
if (j == ARRAY_SIZE (embed_signatures))
|
||
continue;
|
||
grub_util_warn (_(message_warn[embed_signatures[j].type]),
|
||
(*sectors)[i], embed_signatures[j].name);
|
||
avail_nsectors--;
|
||
if (avail_nsectors < *nsectors)
|
||
*nsectors = avail_nsectors;
|
||
|
||
/* Avoid this sector. */
|
||
for (j = i; j < *nsectors; j++)
|
||
(*sectors)[j]++;
|
||
|
||
/* Have we run out of space? */
|
||
if (avail_nsectors < orig_nsectors)
|
||
break;
|
||
|
||
/* Make sure to check the next sector. */
|
||
i--;
|
||
}
|
||
grub_free (embed_signature_check);
|
||
|
||
if (*nsectors < orig_nsectors)
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
N_("other software is using the embedding area, and "
|
||
"there is not enough room for core.img. Such "
|
||
"software is often trying to store data in a way "
|
||
"that avoids detection. We recommend you "
|
||
"investigate"));
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
if (end <= 1)
|
||
return grub_error (GRUB_ERR_FILE_NOT_FOUND,
|
||
N_("this msdos-style partition label has no "
|
||
"post-MBR gap; embedding won't be possible"));
|
||
|
||
if (*nsectors > 62)
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
N_("your core.img is unusually large. "
|
||
"It won't fit in the embedding area"));
|
||
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
N_("your embedding area is unusually small. "
|
||
"core.img won't fit in it."));
|
||
}
|
||
#endif
|
||
|
||
|
||
/* Partition map type. */
|
||
static struct grub_partition_map grub_msdos_partition_map =
|
||
{
|
||
.name = "msdos",
|
||
.iterate = grub_partition_msdos_iterate,
|
||
#ifdef GRUB_UTIL
|
||
.embed = pc_partition_map_embed
|
||
#endif
|
||
};
|
||
|
||
GRUB_MOD_INIT(part_msdos)
|
||
{
|
||
grub_partition_map_register (&grub_msdos_partition_map);
|
||
}
|
||
|
||
GRUB_MOD_FINI(part_msdos)
|
||
{
|
||
grub_partition_map_unregister (&grub_msdos_partition_map);
|
||
}
|