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alistair23-linux/fs/hfsplus/hfsplus_raw.h
Eric Sandeen 9250f92597 hfsplus: handle more on-disk corruptions without oopsing 
hfs seems prone to bad things when it encounters on disk corruption.  Many
values are read from disk, and used as lengths to memcpy, as an example.
This patch fixes up several of these problematic cases.

o sanity check the on-disk maximum key lengths on mount
  (these are set to a defined value at mkfs time and shouldn't differ)
o check on-disk node keylens against the maximum key length for each tree
o fix hfs_btree_open so that going out via free_tree: doesn't wind
  up in hfs_releasepage, which wants to follow the very pointer
  we were trying to set up:
	HFS_SB(sb)->cat_tree = hfs_btree_open()
    .
  failure gets to hfs_releasepage and tries to follow HFS_SB(sb)->cat_tree

Tested with the fsfuzzer; it survives more than it used to.

[hch: ported of commit cf05946250 from hfs]
[hch: added the fixes from 5581d018ed3493d226e7a4d645d9c8a5af6c36b]

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Christoph Hellwig <hch@tuxera.com>
2010-10-14 09:53:48 -04:00

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/*
* linux/include/linux/hfsplus_raw.h
*
* Copyright (C) 1999
* Brad Boyer (flar@pants.nu)
* (C) 2003 Ardis Technologies <roman@ardistech.com>
*
* Format of structures on disk
* Information taken from Apple Technote #1150 (HFS Plus Volume Format)
*
*/
#ifndef _LINUX_HFSPLUS_RAW_H
#define _LINUX_HFSPLUS_RAW_H
#include <linux/types.h>
/* Some constants */
#define HFSPLUS_SECTOR_SIZE 512
#define HFSPLUS_SECTOR_SHIFT 9
#define HFSPLUS_VOLHEAD_SECTOR 2
#define HFSPLUS_VOLHEAD_SIG 0x482b
#define HFSPLUS_VOLHEAD_SIGX 0x4858
#define HFSPLUS_SUPER_MAGIC 0x482b
#define HFSPLUS_MIN_VERSION 4
#define HFSPLUS_CURRENT_VERSION 5
#define HFSP_WRAP_MAGIC 0x4244
#define HFSP_WRAP_ATTRIB_SLOCK 0x8000
#define HFSP_WRAP_ATTRIB_SPARED 0x0200
#define HFSP_WRAPOFF_SIG 0x00
#define HFSP_WRAPOFF_ATTRIB 0x0A
#define HFSP_WRAPOFF_ABLKSIZE 0x14
#define HFSP_WRAPOFF_ABLKSTART 0x1C
#define HFSP_WRAPOFF_EMBEDSIG 0x7C
#define HFSP_WRAPOFF_EMBEDEXT 0x7E
#define HFSP_HIDDENDIR_NAME "\xe2\x90\x80\xe2\x90\x80\xe2\x90\x80\xe2\x90\x80HFS+ Private Data"
#define HFSP_HARDLINK_TYPE 0x686c6e6b /* 'hlnk' */
#define HFSP_HFSPLUS_CREATOR 0x6866732b /* 'hfs+' */
#define HFSP_SYMLINK_TYPE 0x736c6e6b /* 'slnk' */
#define HFSP_SYMLINK_CREATOR 0x72686170 /* 'rhap' */
#define HFSP_MOUNT_VERSION 0x482b4c78 /* 'H+Lx' */
/* Structures used on disk */
typedef __be32 hfsplus_cnid;
typedef __be16 hfsplus_unichr;
/* A "string" as used in filenames, etc. */
struct hfsplus_unistr {
__be16 length;
hfsplus_unichr unicode[255];
} __packed;
#define HFSPLUS_MAX_STRLEN 255
/* POSIX permissions */
struct hfsplus_perm {
__be32 owner;
__be32 group;
u8 rootflags;
u8 userflags;
__be16 mode;
__be32 dev;
} __packed;
#define HFSPLUS_FLG_NODUMP 0x01
#define HFSPLUS_FLG_IMMUTABLE 0x02
#define HFSPLUS_FLG_APPEND 0x04
/* A single contiguous area of a file */
struct hfsplus_extent {
__be32 start_block;
__be32 block_count;
} __packed;
typedef struct hfsplus_extent hfsplus_extent_rec[8];
/* Information for a "Fork" in a file */
struct hfsplus_fork_raw {
__be64 total_size;
__be32 clump_size;
__be32 total_blocks;
hfsplus_extent_rec extents;
} __packed;
/* HFS+ Volume Header */
struct hfsplus_vh {
__be16 signature;
__be16 version;
__be32 attributes;
__be32 last_mount_vers;
u32 reserved;
__be32 create_date;
__be32 modify_date;
__be32 backup_date;
__be32 checked_date;
__be32 file_count;
__be32 folder_count;
__be32 blocksize;
__be32 total_blocks;
__be32 free_blocks;
__be32 next_alloc;
__be32 rsrc_clump_sz;
__be32 data_clump_sz;
hfsplus_cnid next_cnid;
__be32 write_count;
__be64 encodings_bmp;
u8 finder_info[32];
struct hfsplus_fork_raw alloc_file;
struct hfsplus_fork_raw ext_file;
struct hfsplus_fork_raw cat_file;
struct hfsplus_fork_raw attr_file;
struct hfsplus_fork_raw start_file;
} __packed;
/* HFS+ volume attributes */
#define HFSPLUS_VOL_UNMNT (1 << 8)
#define HFSPLUS_VOL_SPARE_BLK (1 << 9)
#define HFSPLUS_VOL_NOCACHE (1 << 10)
#define HFSPLUS_VOL_INCNSTNT (1 << 11)
#define HFSPLUS_VOL_NODEID_REUSED (1 << 12)
#define HFSPLUS_VOL_JOURNALED (1 << 13)
#define HFSPLUS_VOL_SOFTLOCK (1 << 15)
/* HFS+ BTree node descriptor */
struct hfs_bnode_desc {
__be32 next;
__be32 prev;
s8 type;
u8 height;
__be16 num_recs;
u16 reserved;
} __packed;
/* HFS+ BTree node types */
#define HFS_NODE_INDEX 0x00
#define HFS_NODE_HEADER 0x01
#define HFS_NODE_MAP 0x02
#define HFS_NODE_LEAF 0xFF
/* HFS+ BTree header */
struct hfs_btree_header_rec {
__be16 depth;
__be32 root;
__be32 leaf_count;
__be32 leaf_head;
__be32 leaf_tail;
__be16 node_size;
__be16 max_key_len;
__be32 node_count;
__be32 free_nodes;
u16 reserved1;
__be32 clump_size;
u8 btree_type;
u8 key_type;
__be32 attributes;
u32 reserved3[16];
} __packed;
/* BTree attributes */
#define HFS_TREE_BIGKEYS 2
#define HFS_TREE_VARIDXKEYS 4
/* HFS+ BTree misc info */
#define HFSPLUS_TREE_HEAD 0
#define HFSPLUS_NODE_MXSZ 32768
/* Some special File ID numbers (stolen from hfs.h) */
#define HFSPLUS_POR_CNID 1 /* Parent Of the Root */
#define HFSPLUS_ROOT_CNID 2 /* ROOT directory */
#define HFSPLUS_EXT_CNID 3 /* EXTents B-tree */
#define HFSPLUS_CAT_CNID 4 /* CATalog B-tree */
#define HFSPLUS_BAD_CNID 5 /* BAD blocks file */
#define HFSPLUS_ALLOC_CNID 6 /* ALLOCation file */
#define HFSPLUS_START_CNID 7 /* STARTup file */
#define HFSPLUS_ATTR_CNID 8 /* ATTRibutes file */
#define HFSPLUS_EXCH_CNID 15 /* ExchangeFiles temp id */
#define HFSPLUS_FIRSTUSER_CNID 16 /* first available user id */
/* btree key type */
#define HFSPLUS_KEY_CASEFOLDING 0xCF /* case-insensitive */
#define HFSPLUS_KEY_BINARY 0xBC /* case-sensitive */
/* HFS+ catalog entry key */
struct hfsplus_cat_key {
__be16 key_len;
hfsplus_cnid parent;
struct hfsplus_unistr name;
} __packed;
#define HFSPLUS_CAT_KEYLEN (sizeof(struct hfsplus_cat_key))
/* Structs from hfs.h */
struct hfsp_point {
__be16 v;
__be16 h;
} __packed;
struct hfsp_rect {
__be16 top;
__be16 left;
__be16 bottom;
__be16 right;
} __packed;
/* HFS directory info (stolen from hfs.h */
struct DInfo {
struct hfsp_rect frRect;
__be16 frFlags;
struct hfsp_point frLocation;
__be16 frView;
} __packed;
struct DXInfo {
struct hfsp_point frScroll;
__be32 frOpenChain;
__be16 frUnused;
__be16 frComment;
__be32 frPutAway;
} __packed;
/* HFS+ folder data (part of an hfsplus_cat_entry) */
struct hfsplus_cat_folder {
__be16 type;
__be16 flags;
__be32 valence;
hfsplus_cnid id;
__be32 create_date;
__be32 content_mod_date;
__be32 attribute_mod_date;
__be32 access_date;
__be32 backup_date;
struct hfsplus_perm permissions;
struct DInfo user_info;
struct DXInfo finder_info;
__be32 text_encoding;
u32 reserved;
} __packed;
/* HFS file info (stolen from hfs.h) */
struct FInfo {
__be32 fdType;
__be32 fdCreator;
__be16 fdFlags;
struct hfsp_point fdLocation;
__be16 fdFldr;
} __packed;
struct FXInfo {
__be16 fdIconID;
u8 fdUnused[8];
__be16 fdComment;
__be32 fdPutAway;
} __packed;
/* HFS+ file data (part of a cat_entry) */
struct hfsplus_cat_file {
__be16 type;
__be16 flags;
u32 reserved1;
hfsplus_cnid id;
__be32 create_date;
__be32 content_mod_date;
__be32 attribute_mod_date;
__be32 access_date;
__be32 backup_date;
struct hfsplus_perm permissions;
struct FInfo user_info;
struct FXInfo finder_info;
__be32 text_encoding;
u32 reserved2;
struct hfsplus_fork_raw data_fork;
struct hfsplus_fork_raw rsrc_fork;
} __packed;
/* File attribute bits */
#define HFSPLUS_FILE_LOCKED 0x0001
#define HFSPLUS_FILE_THREAD_EXISTS 0x0002
/* HFS+ catalog thread (part of a cat_entry) */
struct hfsplus_cat_thread {
__be16 type;
s16 reserved;
hfsplus_cnid parentID;
struct hfsplus_unistr nodeName;
} __packed;
#define HFSPLUS_MIN_THREAD_SZ 10
/* A data record in the catalog tree */
typedef union {
__be16 type;
struct hfsplus_cat_folder folder;
struct hfsplus_cat_file file;
struct hfsplus_cat_thread thread;
} __packed hfsplus_cat_entry;
/* HFS+ catalog entry type */
#define HFSPLUS_FOLDER 0x0001
#define HFSPLUS_FILE 0x0002
#define HFSPLUS_FOLDER_THREAD 0x0003
#define HFSPLUS_FILE_THREAD 0x0004
/* HFS+ extents tree key */
struct hfsplus_ext_key {
__be16 key_len;
u8 fork_type;
u8 pad;
hfsplus_cnid cnid;
__be32 start_block;
} __packed;
#define HFSPLUS_EXT_KEYLEN sizeof(struct hfsplus_ext_key)
/* HFS+ generic BTree key */
typedef union {
__be16 key_len;
struct hfsplus_cat_key cat;
struct hfsplus_ext_key ext;
} __packed hfsplus_btree_key;
#endif
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