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blkid: Add support for > 64k cluster NTFS volumes. #167

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blkid: Add support for > 64k cluster NTFS volumes. #167

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15 changes: 15 additions & 0 deletions lib/blkid/probe.c
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Original file line number Diff line number Diff line change
Expand Up @@ -701,6 +701,21 @@ static int probe_ntfs(struct blkid_probe *probe,
bytes_per_sector = ns->bios_parameter_block[0] +
(ns->bios_parameter_block[1] << 8);
sectors_per_cluster = ns->bios_parameter_block[2];
if (sectors_per_cluster >= 244 && sectors_per_cluster <= 248 &&
(bytes_per_sector << (256 - sectors_per_cluster)) <= 2097152)
{
/* Special case: Above the value 128, the number of sectors per
* cluster is encoded as a power of 2 / bitshift value, but only
* up to and including the maximum cluster size, 2 MiB. */
sectors_per_cluster = 1 << (256 - sectors_per_cluster);
}
else if (sectors_per_cluster > 128 ||
(sectors_per_cluster & (sectors_per_cluster - 1)))
{
/* Sectors per cluster out of range or not a power of 2. Not a
* valid NTFS volume. */
return 1;
}

if ((bytes_per_sector < 512) || (sectors_per_cluster == 0))
return 1;
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