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Check amiga partmap checksum

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-12-31 15:23:06 +01:00
parent b9cd13659c
commit fb17547ca8
1 changed files with 17 additions and 3 deletions
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20
grub-core/partmap/amiga.c
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@ -37,7 +37,7 @@ struct grub_amiga_rdsk
grub_uint32_t partitionlst;
grub_uint32_t fslst;
/* The other information is not important for us. */
grub_uint32_t unused[128 - 9];
} __attribute__ ((packed));
struct grub_amiga_partition
@ -65,12 +65,24 @@ struct grub_amiga_partition
grub_uint32_t highcyl;
grub_uint32_t firstcyl;
grub_uint32_t unused[128 - 44];
} __attribute__ ((packed));
static struct grub_partition_map grub_amiga_partition_map;
static grub_uint32_t
amiga_partition_map_checksum (void *buf, grub_size_t sz)
{
grub_uint32_t *ptr = buf;
grub_uint32_t r = 0;
sz /= sizeof (grub_uint32_t);
for (; sz; sz--, ptr++)
r += grub_be_to_cpu32 (*ptr);
return r;
}
static grub_err_t
amiga_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
@ -90,7 +102,8 @@ amiga_partition_map_iterate (grub_disk_t disk,
return grub_errno;
if (grub_memcmp (rdsk.magic, GRUB_AMIGA_RDSK_MAGIC,
sizeof (rdsk.magic)) == 0)
sizeof (rdsk.magic)) == 0
&& amiga_partition_map_checksum (&rdsk, sizeof (rdsk)) == 0)
{
/* Found the first PART block. */
next = grub_be_to_cpu32 (rdsk.partitionlst);
@ -112,7 +125,8 @@ amiga_partition_map_iterate (grub_disk_t disk,
return grub_errno;
if (grub_memcmp (apart.magic, GRUB_AMIGA_PART_MAGIC,
sizeof (apart.magic)) == 0)
sizeof (apart.magic)) == 0
&& amiga_partition_map_checksum (&apart, sizeof (apart)) == 0)
/* Calculate the first block and the size of the partition. */
part.start = (grub_be_to_cpu32 (apart.lowcyl)