Adding upstream version 2.39.3.upstream/2.39.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 260 insertions, 0 deletions

diff --git a/libblkid/src/superblocks/ntfs.c b/libblkid/src/superblocks/ntfs.c
new file mode 100644
index 0000000..ab8c921
--- /dev/null
+++ b/libblkid/src/superblocks/ntfs.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include "superblocks.h"
+
+struct ntfs_bios_parameters {
+	uint16_t	sector_size;	/* Size of a sector in bytes. */
+	uint8_t		sectors_per_cluster;	/* Size of a cluster in sectors. */
+	uint16_t	reserved_sectors;	/* zero */
+	uint8_t		fats;			/* zero */
+	uint16_t	root_entries;		/* zero */
+	uint16_t	sectors;		/* zero */
+	uint8_t		media_type;		/* 0xf8 = hard disk */
+	uint16_t	sectors_per_fat;	/* zero */
+	uint16_t	sectors_per_track;	/* irrelevant */
+	uint16_t	heads;			/* irrelevant */
+	uint32_t	hidden_sectors;		/* zero */
+	uint32_t	large_sectors;		/* zero */
+} __attribute__ ((__packed__));
+
+struct ntfs_super_block {
+	uint8_t		jump[3];
+	uint8_t		oem_id[8];	/* magic string */
+
+	struct ntfs_bios_parameters	bpb;
+
+	uint16_t	unused[2];
+	uint64_t	number_of_sectors;
+	uint64_t	mft_cluster_location;
+	uint64_t	mft_mirror_cluster_location;
+	int8_t		clusters_per_mft_record;
+	uint8_t		reserved1[3];
+	int8_t		cluster_per_index_record;
+	uint8_t		reserved2[3];
+	uint64_t	volume_serial;
+	uint32_t	checksum;
+} __attribute__((packed));
+
+struct master_file_table_record {
+	uint32_t	magic;
+	uint16_t	usa_ofs;
+	uint16_t	usa_count;
+	uint64_t	lsn;
+	uint16_t	sequence_number;
+	uint16_t	link_count;
+	uint16_t	attrs_offset;
+	uint16_t	flags;
+	uint32_t	bytes_in_use;
+	uint32_t	bytes_allocated;
+} __attribute__((__packed__));
+
+struct file_attribute {
+	uint32_t	type;
+	uint32_t	len;
+	uint8_t		non_resident;
+	uint8_t		name_len;
+	uint16_t	name_offset;
+	uint16_t	flags;
+	uint16_t	instance;
+	uint32_t	value_len;
+	uint16_t	value_offset;
+} __attribute__((__packed__));
+
+#define MFT_RECORD_VOLUME	3
+/* Windows 10 Creators edition has extended the cluster size limit to 2MB */
+#define NTFS_MAX_CLUSTER_SIZE	(2 * 1024 * 1024)
+
+#define	MFT_RECORD_ATTR_VOLUME_NAME	0x60
+#define	MFT_RECORD_ATTR_END		0xffffffff
+
+static int __probe_ntfs(blkid_probe pr, const struct blkid_idmag *mag, int save_info)
+{
+	struct ntfs_super_block *ns;
+	struct master_file_table_record *mft;
+
+	uint32_t sectors_per_cluster, mft_record_size;
+	uint16_t sector_size;
+	uint64_t nr_clusters, off, attr_off;
+	unsigned char *buf_mft;
+
+	ns = blkid_probe_get_sb(pr, mag, struct ntfs_super_block);
+	if (!ns)
+		return errno ? -errno : 1;
+
+	/*
+	 * Check bios parameters block
+	 */
+	sector_size = le16_to_cpu(ns->bpb.sector_size);
+
+	if (sector_size < 256 || sector_size > 4096 || !is_power_of_2(sector_size))
+		return 1;
+
+	switch (ns->bpb.sectors_per_cluster) {
+	case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128:
+		sectors_per_cluster = ns->bpb.sectors_per_cluster;
+		break;
+	default:
+		if ((ns->bpb.sectors_per_cluster < 240)
+		    || (ns->bpb.sectors_per_cluster > 249))
+			return 1;
+		sectors_per_cluster = 1 << (256 - ns->bpb.sectors_per_cluster);
+	}
+
+	if ((uint16_t) le16_to_cpu(ns->bpb.sector_size) *
+			sectors_per_cluster > NTFS_MAX_CLUSTER_SIZE)
+		return 1;
+
+	/* Unused fields must be zero */
+	if (le16_to_cpu(ns->bpb.reserved_sectors)
+	    || le16_to_cpu(ns->bpb.root_entries)
+	    || le16_to_cpu(ns->bpb.sectors)
+	    || le16_to_cpu(ns->bpb.sectors_per_fat)
+	    || le32_to_cpu(ns->bpb.large_sectors)
+	    || ns->bpb.fats)
+		return 1;
+
+	if ((uint8_t) ns->clusters_per_mft_record < 0xe1
+	    || (uint8_t) ns->clusters_per_mft_record > 0xf7) {
+
+		switch (ns->clusters_per_mft_record) {
+		case 1: case 2: case 4: case 8: case 16: case 32: case 64:
+			break;
+		default:
+			return 1;
+		}
+	}
+
+	if (ns->clusters_per_mft_record > 0) {
+		mft_record_size = ns->clusters_per_mft_record *
+				  sectors_per_cluster * sector_size;
+	} else {
+		int8_t mft_record_size_shift = 0 - ns->clusters_per_mft_record;
+		if (mft_record_size_shift < 0 || mft_record_size_shift >= 31)
+			return 1;
+		mft_record_size = 1 << mft_record_size_shift;
+	}
+
+	nr_clusters = le64_to_cpu(ns->number_of_sectors) / sectors_per_cluster;
+
+	if ((le64_to_cpu(ns->mft_cluster_location) > nr_clusters) ||
+	    (le64_to_cpu(ns->mft_mirror_cluster_location) > nr_clusters))
+		return 1;
+
+
+	off = le64_to_cpu(ns->mft_cluster_location) * sector_size *
+		sectors_per_cluster;
+
+	DBG(LOWPROBE, ul_debug("NTFS: sector_size=%"PRIu16", mft_record_size=%"PRIu32", "
+			"sectors_per_cluster=%"PRIu32", nr_clusters=%"PRIu64" "
+			"cluster_offset=%"PRIu64"",
+			sector_size, mft_record_size,
+			sectors_per_cluster, nr_clusters,
+			off));
+
+	if (mft_record_size < 4)
+		return 1;
+
+	buf_mft = blkid_probe_get_buffer(pr, off, mft_record_size);
+	if (!buf_mft)
+		return errno ? -errno : 1;
+
+	if (memcmp(buf_mft, "FILE", 4) != 0)
+		return 1;
+
+	off += MFT_RECORD_VOLUME * mft_record_size;
+
+	buf_mft = blkid_probe_get_buffer(pr, off, mft_record_size);
+	if (!buf_mft)
+		return errno ? -errno : 1;
+
+	if (memcmp(buf_mft, "FILE", 4) != 0)
+		return 1;
+
+	/* return if caller does not care about UUID and LABEL */
+	if (!save_info)
+		return 0;
+
+	mft = (struct master_file_table_record *) buf_mft;
+	attr_off = le16_to_cpu(mft->attrs_offset);
+
+	while (attr_off + sizeof(struct file_attribute) <= mft_record_size &&
+	       attr_off <= le32_to_cpu(mft->bytes_allocated)) {
+
+		uint32_t attr_len;
+		struct file_attribute *attr;
+
+		attr = (struct file_attribute *) (buf_mft + attr_off);
+		attr_len = le32_to_cpu(attr->len);
+		if (!attr_len)
+			break;
+
+		if (le32_to_cpu(attr->type) == (uint32_t) MFT_RECORD_ATTR_END)
+			break;
+		if (le32_to_cpu(attr->type) == (uint32_t) MFT_RECORD_ATTR_VOLUME_NAME) {
+			unsigned int val_off = le16_to_cpu(attr->value_offset);
+			unsigned int val_len = le32_to_cpu(attr->value_len);
+			unsigned char *val = ((uint8_t *) attr) + val_off;
+
+			if (attr_off + val_off + val_len <= mft_record_size)
+				blkid_probe_set_utf8label(pr, val, val_len,
+							  UL_ENCODE_UTF16LE);
+			break;
+		}
+
+		attr_off += attr_len;
+	}
+
+
+	blkid_probe_set_fsblocksize(pr, sector_size * sectors_per_cluster);
+	blkid_probe_set_block_size(pr, sector_size);
+	blkid_probe_set_fssize(pr, le64_to_cpu(ns->number_of_sectors) * sector_size);
+
+	blkid_probe_sprintf_uuid(pr,
+			(unsigned char *) &ns->volume_serial,
+			sizeof(ns->volume_serial),
+			"%016" PRIX64, le64_to_cpu(ns->volume_serial));
+	return 0;
+}
+
+static int probe_ntfs(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	return __probe_ntfs(pr, mag, 1);
+}
+
+int blkid_probe_is_ntfs(blkid_probe pr)
+{
+	const struct blkid_idmag *mag = NULL;
+	int rc;
+
+	rc = blkid_probe_get_idmag(pr, &ntfs_idinfo, NULL, &mag);
+	if (rc < 0)
+		return rc;	/* error */
+	if (rc != BLKID_PROBE_OK || !mag)
+		return 0;
+
+	return __probe_ntfs(pr, mag, 0) == 0 ? 1 : 0;
+}
+
+const struct blkid_idinfo ntfs_idinfo =
+{
+	.name		= "ntfs",
+	.usage		= BLKID_USAGE_FILESYSTEM,
+	.probefunc	= probe_ntfs,
+	.magics		=
+	{
+		{ .magic = "NTFS    ", .len = 8, .sboff = 3 },
+		{ NULL }
+	}
+};
+