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linux/fs/hfsplus/hfsplus_raw.h
Kees Cook e35fa567a0 hfsplus: use struct_group_attr() for memcpy() region 
In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memset(), avoid intentionally writing across
neighboring fields.

Add struct_group() to mark the "info" region (containing struct DInfo
and struct DXInfo structs) in struct hfsplus_cat_folder and struct
hfsplus_cat_file that are written into directly, so the compiler can
correctly reason about the expected size of the writes.

"pahole" shows no size nor member offset changes to struct
hfsplus_cat_folder nor struct hfsplus_cat_file.  "objdump -d" shows no
object code changes.

Link: https://lkml.kernel.org/r/20211119192851.1046717-1-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-20 08:52:54 +02:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* 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;
#define HFSPLUS_MAX_STRLEN 255
#define HFSPLUS_ATTR_MAX_STRLEN 127
/* A "string" as used in filenames, etc. */
struct hfsplus_unistr {
__be16 length;
hfsplus_unichr unicode[HFSPLUS_MAX_STRLEN];
} __packed;
/*
* A "string" is used in attributes file
* for name of extended attribute
*/
struct hfsplus_attr_unistr {
__be16 length;
hfsplus_unichr unicode[HFSPLUS_ATTR_MAX_STRLEN];
} __packed;
/* 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;
u32 finder_info[8];
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)
#define HFSPLUS_VOL_UNUSED_NODE_FIX (1 << 31)
/* 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 /* An internal (index) node */
#define HFS_NODE_HEADER 0x01 /* The tree header node (node 0) */
#define HFS_NODE_MAP 0x02 /* Holds part of the bitmap of used nodes */
#define HFS_NODE_LEAF 0xFF /* A leaf (ndNHeight==1) node */
/* 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
#define HFSPLUS_ATTR_TREE_NODE_SIZE 8192
#define HFSPLUS_BTREE_HDR_NODE_RECS_COUNT 3
#define HFSPLUS_BTREE_HDR_USER_BYTES 128
/* 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_group_attr(info, __packed,
struct DInfo user_info;
struct DXInfo finder_info;
);
__be32 text_encoding;
__be32 subfolders; /* Subfolder count in HFSX. Reserved in HFS+. */
} __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_group_attr(info, __packed,
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 and folder flag bits */
#define HFSPLUS_FILE_LOCKED 0x0001
#define HFSPLUS_FILE_THREAD_EXISTS 0x0002
#define HFSPLUS_XATTR_EXISTS 0x0004
#define HFSPLUS_ACL_EXISTS 0x0008
#define HFSPLUS_HAS_FOLDER_COUNT 0x0010 /* Folder has subfolder count
* (HFSX only) */
/* 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)
#define HFSPLUS_XATTR_FINDER_INFO_NAME "com.apple.FinderInfo"
#define HFSPLUS_XATTR_ACL_NAME "com.apple.system.Security"
#define HFSPLUS_ATTR_INLINE_DATA 0x10
#define HFSPLUS_ATTR_FORK_DATA 0x20
#define HFSPLUS_ATTR_EXTENTS 0x30
/* HFS+ attributes tree key */
struct hfsplus_attr_key {
__be16 key_len;
__be16 pad;
hfsplus_cnid cnid;
__be32 start_block;
struct hfsplus_attr_unistr key_name;
} __packed;
#define HFSPLUS_ATTR_KEYLEN sizeof(struct hfsplus_attr_key)
/* HFS+ fork data attribute */
struct hfsplus_attr_fork_data {
__be32 record_type;
__be32 reserved;
struct hfsplus_fork_raw the_fork;
} __packed;
/* HFS+ extension attribute */
struct hfsplus_attr_extents {
__be32 record_type;
__be32 reserved;
struct hfsplus_extent extents;
} __packed;
#define HFSPLUS_MAX_INLINE_DATA_SIZE 3802
/* HFS+ attribute inline data */
struct hfsplus_attr_inline_data {
__be32 record_type;
__be32 reserved1;
u8 reserved2[6];
__be16 length;
u8 raw_bytes[HFSPLUS_MAX_INLINE_DATA_SIZE];
} __packed;
/* A data record in the attributes tree */
typedef union {
__be32 record_type;
struct hfsplus_attr_fork_data fork_data;
struct hfsplus_attr_extents extents;
struct hfsplus_attr_inline_data inline_data;
} __packed hfsplus_attr_entry;
/* HFS+ generic BTree key */
typedef union {
__be16 key_len;
struct hfsplus_cat_key cat;
struct hfsplus_ext_key ext;
struct hfsplus_attr_key attr;
} __packed hfsplus_btree_key;
#endif
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