From dde33348e53ecab687a9768bf5262f0b8f79b7f2 Mon Sep 17 00:00:00 2001 From: Anton Altaparmakov Date: Mon, 21 May 2007 09:37:42 +0100 Subject: LDM: Fix for Windows Vista dynamic disks This fixes the LDM driver so that it works with Windows Vista dynamic disks which are subtly different to Windows 2000/XP ones. The patch was needed to get a Vista formatted dynamic disk to be recognized and parsed successfully. Thanks go to Chris Teachworth for the report and testing. Cc: Richard Russon Signed-off-by: Anton Altaparmakov Signed-off-by: Linus Torvalds --- fs/partitions/ldm.c | 206 +++++++++++++++++++++++++++++----------------------- 1 file changed, 116 insertions(+), 90 deletions(-) (limited to 'fs/partitions/ldm.c') diff --git a/fs/partitions/ldm.c b/fs/partitions/ldm.c index 1a60926a4ccd..c387812537d7 100644 --- a/fs/partitions/ldm.c +++ b/fs/partitions/ldm.c @@ -2,10 +2,10 @@ * ldm - Support for Windows Logical Disk Manager (Dynamic Disks) * * Copyright (C) 2001,2002 Richard Russon - * Copyright (c) 2001-2004 Anton Altaparmakov + * Copyright (c) 2001-2007 Anton Altaparmakov * Copyright (C) 2001,2002 Jakob Kemi * - * Documentation is available at http://linux-ntfs.sf.net/ldm + * Documentation is available at http://www.linux-ntfs.org/content/view/19/37/ * * This program 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 @@ -62,7 +62,6 @@ static void _ldm_printk (const char *level, const char *function, printk ("%s%s(): %s\n", level, function, buf); } - /** * ldm_parse_hexbyte - Convert a ASCII hex number to a byte * @src: Pointer to at least 2 characters to convert. @@ -118,7 +117,6 @@ static bool ldm_parse_guid (const u8 *src, u8 *dest) return true; } - /** * ldm_parse_privhead - Read the LDM Database PRIVHEAD structure * @data: Raw database PRIVHEAD structure loaded from the device @@ -130,46 +128,48 @@ static bool ldm_parse_guid (const u8 *src, u8 *dest) * Return: 'true' @ph contains the PRIVHEAD data * 'false' @ph contents are undefined */ -static bool ldm_parse_privhead (const u8 *data, struct privhead *ph) +static bool ldm_parse_privhead(const u8 *data, struct privhead *ph) { - BUG_ON (!data || !ph); + bool is_vista = false; - if (MAGIC_PRIVHEAD != BE64 (data)) { - ldm_error ("Cannot find PRIVHEAD structure. LDM database is" + BUG_ON(!data || !ph); + if (MAGIC_PRIVHEAD != BE64(data)) { + ldm_error("Cannot find PRIVHEAD structure. LDM database is" " corrupt. Aborting."); return false; } - - ph->ver_major = BE16 (data + 0x000C); - ph->ver_minor = BE16 (data + 0x000E); - ph->logical_disk_start = BE64 (data + 0x011B); - ph->logical_disk_size = BE64 (data + 0x0123); - ph->config_start = BE64 (data + 0x012B); - ph->config_size = BE64 (data + 0x0133); - - if ((ph->ver_major != 2) || (ph->ver_minor != 11)) { - ldm_error ("Expected PRIVHEAD version %d.%d, got %d.%d." - " Aborting.", 2, 11, ph->ver_major, ph->ver_minor); + ph->ver_major = BE16(data + 0x000C); + ph->ver_minor = BE16(data + 0x000E); + ph->logical_disk_start = BE64(data + 0x011B); + ph->logical_disk_size = BE64(data + 0x0123); + ph->config_start = BE64(data + 0x012B); + ph->config_size = BE64(data + 0x0133); + /* Version 2.11 is Win2k/XP and version 2.12 is Vista. */ + if (ph->ver_major == 2 && ph->ver_minor == 12) + is_vista = true; + if (!is_vista && (ph->ver_major != 2 || ph->ver_minor != 11)) { + ldm_error("Expected PRIVHEAD version 2.11 or 2.12, got %d.%d." + " Aborting.", ph->ver_major, ph->ver_minor); return false; } + ldm_debug("PRIVHEAD version %d.%d (Windows %s).", ph->ver_major, + ph->ver_minor, is_vista ? "Vista" : "2000/XP"); if (ph->config_size != LDM_DB_SIZE) { /* 1 MiB in sectors. */ - /* Warn the user and continue, carefully */ - ldm_info ("Database is normally %u bytes, it claims to " + /* Warn the user and continue, carefully. */ + ldm_info("Database is normally %u bytes, it claims to " "be %llu bytes.", LDM_DB_SIZE, - (unsigned long long)ph->config_size ); + udunsigned long long)ph->config_size); } - if ((ph->logical_disk_size == 0) || - (ph->logical_disk_start + ph->logical_disk_size > ph->config_start)) { - ldm_error ("PRIVHEAD disk size doesn't match real disk size"); + if ((ph->logical_disk_size == 0) || (ph->logical_disk_start + + ph->logical_disk_size > ph->config_start)) { + ldm_error("PRIVHEAD disk size doesn't match real disk size"); return false; } - - if (!ldm_parse_guid (data + 0x0030, ph->disk_id)) { - ldm_error ("PRIVHEAD contains an invalid GUID."); + if (!ldm_parse_guid(data + 0x0030, ph->disk_id)) { + ldm_error("PRIVHEAD contains an invalid GUID."); return false; } - - ldm_debug ("Parsed PRIVHEAD successfully."); + ldm_debug("Parsed PRIVHEAD successfully."); return true; } @@ -409,7 +409,7 @@ out: * Return: 'true' @toc1 contains validated TOCBLOCK info * 'false' @toc1 contents are undefined */ -static bool ldm_validate_tocblocks (struct block_device *bdev, +static bool ldm_validate_tocblocks(struct block_device *bdev, unsigned long base, struct ldmdb *ldb) { static const int off[4] = { OFF_TOCB1, OFF_TOCB2, OFF_TOCB3, OFF_TOCB4}; @@ -417,54 +417,57 @@ static bool ldm_validate_tocblocks (struct block_device *bdev, struct privhead *ph; Sector sect; u8 *data; + int i, nr_tbs; bool result = false; - int i; - BUG_ON (!bdev || !ldb); - - ph = &ldb->ph; + BUG_ON(!bdev || !ldb); + ph = &ldb->ph; tb[0] = &ldb->toc; - tb[1] = kmalloc (sizeof (*tb[1]), GFP_KERNEL); - tb[2] = kmalloc (sizeof (*tb[2]), GFP_KERNEL); - tb[3] = kmalloc (sizeof (*tb[3]), GFP_KERNEL); - if (!tb[1] || !tb[2] || !tb[3]) { - ldm_crit ("Out of memory."); - goto out; + tb[1] = kmalloc(sizeof(*tb[1]) * 3, GFP_KERNEL); + if (!tb[1]) { + ldm_crit("Out of memory."); + goto err; } - - for (i = 0; i < 4; i++) /* Read and parse all four toc's. */ - { - data = read_dev_sector (bdev, base + off[i], §); + tb[2] = (struct tocblock*)((u8*)tb[1] + sizeof(*tb[1])); + tb[3] = (struct tocblock*)((u8*)tb[2] + sizeof(*tb[2])); + /* + * Try to read and parse all four TOCBLOCKs. + * + * Windows Vista LDM v2.12 does not always have all four TOCBLOCKs so + * skip any that fail as long as we get at least one valid TOCBLOCK. + */ + for (nr_tbs = i = 0; i < 4; i++) { + data = read_dev_sector(bdev, base + off[i], §); if (!data) { - ldm_crit ("Disk read failed."); - goto out; + ldm_error("Disk read failed for TOCBLOCK %d.", i); + continue; } - result = ldm_parse_tocblock (data, tb[i]); - put_dev_sector (sect); - if (!result) - goto out; /* Already logged */ + if (ldm_parse_tocblock(data, tb[nr_tbs])) + nr_tbs++; + put_dev_sector(sect); } - - /* Range check the toc against a privhead. */ + if (!nr_tbs) { + ldm_crit("Failed to find a valid TOCBLOCK."); + goto err; + } + /* Range check the TOCBLOCK against a privhead. */ if (((tb[0]->bitmap1_start + tb[0]->bitmap1_size) > ph->config_size) || - ((tb[0]->bitmap2_start + tb[0]->bitmap2_size) > ph->config_size)) { - ldm_crit ("The bitmaps are out of range. Giving up."); - goto out; + ((tb[0]->bitmap2_start + tb[0]->bitmap2_size) > + ph->config_size)) { + ldm_crit("The bitmaps are out of range. Giving up."); + goto err; } - - if (!ldm_compare_tocblocks (tb[0], tb[1]) || /* Compare all tocs. */ - !ldm_compare_tocblocks (tb[0], tb[2]) || - !ldm_compare_tocblocks (tb[0], tb[3])) { - ldm_crit ("The TOCBLOCKs don't match."); - goto out; + /* Compare all loaded TOCBLOCKs. */ + for (i = 1; i < nr_tbs; i++) { + if (!ldm_compare_tocblocks(tb[0], tb[i])) { + ldm_crit("TOCBLOCKs 0 and %d do not match.", i); + goto err; + } } - - ldm_debug ("Validated TOCBLOCKs successfully."); + ldm_debug("Validated %d TOCBLOCKs successfully.", nr_tbs); result = true; -out: - kfree (tb[1]); - kfree (tb[2]); - kfree (tb[3]); +err: + kfree(tb[1]); return result; } @@ -566,7 +569,7 @@ static bool ldm_validate_partition_table (struct block_device *bdev) p = (struct partition*)(data + 0x01BE); for (i = 0; i < 4; i++, p++) - if (SYS_IND (p) == WIN2K_DYNAMIC_PARTITION) { + if (SYS_IND (p) == LDM_PARTITION) { result = true; break; } @@ -975,44 +978,68 @@ static bool ldm_parse_dsk4 (const u8 *buffer, int buflen, struct vblk *vb) * Return: 'true' @vb contains a Partition VBLK * 'false' @vb contents are not defined */ -static bool ldm_parse_prt3 (const u8 *buffer, int buflen, struct vblk *vb) +static bool ldm_parse_prt3(const u8 *buffer, int buflen, struct vblk *vb) { int r_objid, r_name, r_size, r_parent, r_diskid, r_index, len; struct vblk_part *part; - BUG_ON (!buffer || !vb); - - r_objid = ldm_relative (buffer, buflen, 0x18, 0); - r_name = ldm_relative (buffer, buflen, 0x18, r_objid); - r_size = ldm_relative (buffer, buflen, 0x34, r_name); - r_parent = ldm_relative (buffer, buflen, 0x34, r_size); - r_diskid = ldm_relative (buffer, buflen, 0x34, r_parent); - + BUG_ON(!buffer || !vb); + r_objid = ldm_relative(buffer, buflen, 0x18, 0); + if (r_objid < 0) { + ldm_error("r_objid %d < 0", r_objid); + return false; + } + r_name = ldm_relative(buffer, buflen, 0x18, r_objid); + if (r_name < 0) { + ldm_error("r_name %d < 0", r_name); + return false; + } + r_size = ldm_relative(buffer, buflen, 0x34, r_name); + if (r_size < 0) { + ldm_error("r_size %d < 0", r_size); + return false; + } + r_parent = ldm_relative(buffer, buflen, 0x34, r_size); + if (r_parent < 0) { + ldm_error("r_parent %d < 0", r_parent); + return false; + } + r_diskid = ldm_relative(buffer, buflen, 0x34, r_parent); + if (r_diskid < 0) { + ldm_error("r_diskid %d < 0", r_diskid); + return false; + } if (buffer[0x12] & VBLK_FLAG_PART_INDEX) { - r_index = ldm_relative (buffer, buflen, 0x34, r_diskid); + r_index = ldm_relative(buffer, buflen, 0x34, r_diskid); + if (r_index < 0) { + ldm_error("r_index %d < 0", r_index); + return false; + } len = r_index; } else { r_index = 0; len = r_diskid; } - if (len < 0) + if (len < 0) { + ldm_error("len %d < 0", len); return false; - + } len += VBLK_SIZE_PRT3; - if (len != BE32 (buffer + 0x14)) + if (len > BE32(buffer + 0x14)) { + ldm_error("len %d > BE32(buffer + 0x14) %d", len, + BE32(buffer + 0x14)); return false; - + } part = &vb->vblk.part; - part->start = BE64 (buffer + 0x24 + r_name); - part->volume_offset = BE64 (buffer + 0x2C + r_name); - part->size = ldm_get_vnum (buffer + 0x34 + r_name); - part->parent_id = ldm_get_vnum (buffer + 0x34 + r_size); - part->disk_id = ldm_get_vnum (buffer + 0x34 + r_parent); + part->start = BE64(buffer + 0x24 + r_name); + part->volume_offset = BE64(buffer + 0x2C + r_name); + part->size = ldm_get_vnum(buffer + 0x34 + r_name); + part->parent_id = ldm_get_vnum(buffer + 0x34 + r_size); + part->disk_id = ldm_get_vnum(buffer + 0x34 + r_parent); if (vb->flags & VBLK_FLAG_PART_INDEX) part->partnum = buffer[0x35 + r_diskid]; else part->partnum = 0; - return true; } @@ -1475,4 +1502,3 @@ out: kfree (ldb); return result; } - -- cgit v1.2.2