1 files changed, 228 insertions, 0 deletions

diff --git a/libblkid/lvm2.c b/libblkid/lvm2.c
new file mode 100644
index 000000000..0afc77322
--- /dev/null
+++ b/libblkid/lvm2.c
@@ -0,0 +1,228 @@
+/*
+ * Copyright (C) 1999 by Andries Brouwer
+ * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
+ * Copyright (C) 2001 by Andreas Dilger
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
+ * Copyright (C) 2012 Milan Broz <mbroz@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 <stdint.h>
+
+#include "superblocks.h"
+
+#define LVM1_ID_LEN 128
+#define LVM2_ID_LEN 32
+
+struct lvm2_pv_label_header {
+	/* label_header */
+	uint8_t		id[8];		/* LABELONE */
+	uint64_t	sector_xl;	/* Sector number of this label */
+	uint32_t	crc_xl;		/* From next field to end of sector */
+	uint32_t	offset_xl;	/* Offset from start of struct to contents */
+	uint8_t		type[8];	/* LVM2 001 */
+	/* pv_header */
+	uint8_t		pv_uuid[LVM2_ID_LEN];
+} __attribute__ ((packed));
+
+struct lvm1_pv_label_header {
+	uint8_t id[2];			/* HM */
+	uint16_t version;		/* version 1 or 2 */
+	uint32_t _notused[10];		/* lvm1 internals */
+	uint8_t pv_uuid[LVM1_ID_LEN];
+} __attribute__ ((packed));
+
+#define LVM2_LABEL_SIZE 512
+static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
+{
+	static const unsigned int crctab[] = {
+		0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
+		0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
+		0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
+		0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
+	};
+	unsigned int i, crc = 0xf597a6cf;
+	const uint8_t *data = (const uint8_t *) buf;
+
+	for (i = 0; i < size; i++) {
+		crc ^= *data++;
+		crc = (crc >> 4) ^ crctab[crc & 0xf];
+		crc = (crc >> 4) ^ crctab[crc & 0xf];
+	}
+	return crc;
+}
+
+/* Length of real UUID is always LVM2_ID_LEN */
+static void format_lvm_uuid(char *dst_uuid, char *src_uuid)
+{
+	unsigned int i, b;
+
+	for (i = 0, b = 1; i < LVM2_ID_LEN; i++, b <<= 1) {
+		if (b & 0x4444440)
+			*dst_uuid++ = '-';
+		*dst_uuid++ = *src_uuid++;
+	}
+	*dst_uuid = '\0';
+}
+
+static int probe_lvm2(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	int sector = mag->kboff << 1;
+	struct lvm2_pv_label_header *label;
+	char uuid[LVM2_ID_LEN + 7];
+	unsigned char *buf;
+
+	buf = blkid_probe_get_buffer(pr,
+			mag->kboff << 10,
+			512 + sizeof(struct lvm2_pv_label_header));
+	if (!buf)
+		return -1;
+
+	/* buf is at 0k or 1k offset; find label inside */
+	if (memcmp(buf, "LABELONE", 8) == 0) {
+		label = (struct lvm2_pv_label_header *) buf;
+	} else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
+		label = (struct lvm2_pv_label_header *)(buf + 512);
+		sector++;
+	} else {
+		return 1;
+	}
+
+	if (le64_to_cpu(label->sector_xl) != (unsigned) sector)
+		return 1;
+
+	if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
+			((char *) &label->offset_xl - (char *) label)) !=
+			le32_to_cpu(label->crc_xl)) {
+		DBG(DEBUG_PROBE,
+		    printf("LVM2: label checksum incorrect at sector %d\n",
+			   sector));
+		return 1;
+	}
+
+	format_lvm_uuid(uuid, (char *) label->pv_uuid);
+	blkid_probe_sprintf_uuid(pr, label->pv_uuid, sizeof(label->pv_uuid),
+			"%s", uuid);
+
+	/* the mag->magic is the same string as label->type,
+	 * but zero terminated */
+	blkid_probe_set_version(pr, mag->magic);
+
+	/* LVM (pvcreate) wipes begin of the device -- let's remember this
+	 * to resolve conflicts bettween LVM and partition tables, ...
+	 */
+	blkid_probe_set_wiper(pr, 0, 8 * 1024);
+
+	return 0;
+}
+
+static int probe_lvm1(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	struct lvm1_pv_label_header *label;
+	char uuid[LVM2_ID_LEN + 7];
+	unsigned int version;
+
+	label = blkid_probe_get_sb(pr, mag, struct lvm1_pv_label_header);
+	if (!label)
+		return -1;
+
+	version = le16_to_cpu(label->version);
+	if (version != 1 && version != 2)
+		return 1;
+
+	format_lvm_uuid(uuid, (char *) label->pv_uuid);
+	blkid_probe_sprintf_uuid(pr, label->pv_uuid, sizeof(label->pv_uuid),
+			"%s", uuid);
+
+	return 0;
+}
+
+struct verity_sb {
+	uint8_t  signature[8];	/* "verity\0\0" */
+	uint32_t version;	/* superblock version */
+	uint32_t hash_type;	/* 0 - Chrome OS, 1 - normal */
+	uint8_t  uuid[16];	/* UUID of hash device */
+	uint8_t  algorithm[32];/* hash algorithm name */
+	uint32_t data_block_size; /* data block in bytes */
+	uint32_t hash_block_size; /* hash block in bytes */
+	uint64_t data_blocks;	/* number of data blocks */
+	uint16_t salt_size;	/* salt size */
+	uint8_t  _pad1[6];
+	uint8_t  salt[256];	/* salt */
+	uint8_t  _pad2[168];
+} __attribute__((packed));
+
+static int probe_verity(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	struct verity_sb *sb;
+	unsigned int version;
+
+	sb = blkid_probe_get_sb(pr, mag, struct verity_sb);
+	if (sb == NULL)
+		return -1;
+
+	version = le32_to_cpu(sb->version);
+	if (version != 1)
+		return 1;
+
+	blkid_probe_set_uuid(pr, sb->uuid);
+	blkid_probe_sprintf_version(pr, "%u", version);
+	return 0;
+}
+
+/* NOTE: the original libblkid uses "lvm2pv" as a name */
+const struct blkid_idinfo lvm2_idinfo =
+{
+	.name		= "LVM2_member",
+	.usage		= BLKID_USAGE_RAID,
+	.probefunc	= probe_lvm2,
+	.magics		=
+	{
+		{ .magic = "LVM2 001", .len = 8, .sboff = 0x218 },
+		{ .magic = "LVM2 001", .len = 8, .sboff = 0x018 },
+		{ .magic = "LVM2 001", .len = 8, .kboff = 1, .sboff = 0x018 },
+		{ .magic = "LVM2 001", .len = 8, .kboff = 1, .sboff = 0x218 },
+		{ NULL }
+	}
+};
+
+const struct blkid_idinfo lvm1_idinfo =
+{
+	.name		= "LVM1_member",
+	.usage		= BLKID_USAGE_RAID,
+	.probefunc	= probe_lvm1,
+	.magics		=
+	{
+		{ .magic = "HM", .len = 2 },
+		{ NULL }
+	}
+};
+
+const struct blkid_idinfo snapcow_idinfo =
+{
+	.name		= "DM_snapshot_cow",
+	.usage		= BLKID_USAGE_OTHER,
+	.magics		=
+	{
+		{ .magic = "SnAp", .len = 4 },
+		{ NULL }
+	}
+};
+
+const struct blkid_idinfo verity_hash_idinfo =
+{
+	.name		= "DM_verity_hash",
+	.usage		= BLKID_USAGE_CRYPTO,
+	.probefunc	= probe_verity,
+	.magics		=
+	{
+		{ .magic = "verity\0\0", .len = 8 },
+		{ NULL }
+	}
+};