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5d299f44d7
In preparation for FORTIFY_SOURCE performing compile-time and run-time
field array bounds checking for memcpy(), memmove(), and memset(),
avoid intentionally writing across neighboring fields.
Introduce more unions to cover the full inline data section, so that the
entire 256 bytes can be addressed by memcpy() without thinking it is
crossing field boundaries. Additionally adjusts dir memcpy() to use
existing union names to get the same coverage.
diffoscope shows there are no binary differences before/after excepting
the name of the initcall, which is line number based:
$ diffoscope --exclude-directory-metadata yes before/fs after/fs
--- before/fs
+++ after/fs
│ --- before/fs/jfs
├── +++ after/fs/jfs
│ │ --- before/fs/jfs/super.o
│ ├── +++ after/fs/jfs/super.o
│ │ ├── readelf --wide --symbols {}
│ │ │ @@ -2,15 +2,15 @@
│ │ │ Symbol table '.symtab' contains 158 entries:
│ │ │ Num: Value Size Type Bind Vis Ndx Name
...
│ │ │ - 5: 0000000000000000 0 NOTYPE LOCAL DEFAULT 6 __initcall__kmod_jfs__319_1049_ini
t_jfs_fs6
│ │ │ + 5: 0000000000000000 0 NOTYPE LOCAL DEFAULT 6 __initcall__kmod_jfs__319_1050_ini
t_jfs_fs6
...
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
170 lines
5.0 KiB
C
170 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) International Business Machines Corp., 2000-2001
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*/
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#ifndef _H_JFS_DINODE
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#define _H_JFS_DINODE
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/*
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* jfs_dinode.h: on-disk inode manager
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*/
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#define INODESLOTSIZE 128
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#define L2INODESLOTSIZE 7
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#define log2INODESIZE 9 /* log2(bytes per dinode) */
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/*
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* on-disk inode : 512 bytes
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*
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* note: align 64-bit fields on 8-byte boundary.
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*/
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struct dinode {
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/*
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* I. base area (128 bytes)
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* ------------------------
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*
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* define generic/POSIX attributes
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*/
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__le32 di_inostamp; /* 4: stamp to show inode belongs to fileset */
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__le32 di_fileset; /* 4: fileset number */
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__le32 di_number; /* 4: inode number, aka file serial number */
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__le32 di_gen; /* 4: inode generation number */
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pxd_t di_ixpxd; /* 8: inode extent descriptor */
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__le64 di_size; /* 8: size */
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__le64 di_nblocks; /* 8: number of blocks allocated */
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__le32 di_nlink; /* 4: number of links to the object */
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__le32 di_uid; /* 4: user id of owner */
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__le32 di_gid; /* 4: group id of owner */
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__le32 di_mode; /* 4: attribute, format and permission */
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struct timestruc_t di_atime; /* 8: time last data accessed */
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struct timestruc_t di_ctime; /* 8: time last status changed */
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struct timestruc_t di_mtime; /* 8: time last data modified */
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struct timestruc_t di_otime; /* 8: time created */
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dxd_t di_acl; /* 16: acl descriptor */
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dxd_t di_ea; /* 16: ea descriptor */
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__le32 di_next_index; /* 4: Next available dir_table index */
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__le32 di_acltype; /* 4: Type of ACL */
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/*
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* Extension Areas.
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*
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* Historically, the inode was partitioned into 4 128-byte areas,
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* the last 3 being defined as unions which could have multiple
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* uses. The first 96 bytes had been completely unused until
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* an index table was added to the directory. It is now more
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* useful to describe the last 3/4 of the inode as a single
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* union. We would probably be better off redesigning the
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* entire structure from scratch, but we don't want to break
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* commonality with OS/2's JFS at this time.
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*/
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union {
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struct {
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/*
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* This table contains the information needed to
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* find a directory entry from a 32-bit index.
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* If the index is small enough, the table is inline,
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* otherwise, an x-tree root overlays this table
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*/
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struct dir_table_slot _table[12]; /* 96: inline */
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dtroot_t _dtroot; /* 288: dtree root */
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} _dir; /* (384) */
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#define di_dirtable u._dir._table
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#define di_dtroot u._dir._dtroot
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#define di_parent di_dtroot.header.idotdot
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#define di_DASD di_dtroot.header.DASD
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struct {
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union {
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u8 _data[96]; /* 96: unused */
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struct {
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void *_imap; /* 4: unused */
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__le32 _gengen; /* 4: generator */
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} _imap;
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} _u1; /* 96: */
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#define di_gengen u._file._u1._imap._gengen
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union {
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xtpage_t _xtroot;
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struct {
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u8 unused[16]; /* 16: */
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dxd_t _dxd; /* 16: */
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union {
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/*
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* The fast symlink area
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* is expected to overflow
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* into _inlineea when
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* needed (which will clear
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* INLINEEA).
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*/
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struct {
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union {
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__le32 _rdev; /* 4: */
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u8 _fastsymlink[128];
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} _u;
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u8 _inlineea[128];
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};
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u8 _inline_all[256];
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};
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} _special;
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} _u2;
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} _file;
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#define di_xtroot u._file._u2._xtroot
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#define di_dxd u._file._u2._special._dxd
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#define di_btroot di_xtroot
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#define di_inlinedata u._file._u2._special._u
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#define di_rdev u._file._u2._special._u._rdev
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#define di_fastsymlink u._file._u2._special._u._fastsymlink
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#define di_inlineea u._file._u2._special._inlineea
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#define di_inline_all u._file._u2._special._inline_all
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} u;
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};
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/* extended mode bits (on-disk inode di_mode) */
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#define IFJOURNAL 0x00010000 /* journalled file */
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#define ISPARSE 0x00020000 /* sparse file enabled */
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#define INLINEEA 0x00040000 /* inline EA area free */
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#define ISWAPFILE 0x00800000 /* file open for pager swap space */
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/* more extended mode bits: attributes for OS/2 */
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#define IREADONLY 0x02000000 /* no write access to file */
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#define IHIDDEN 0x04000000 /* hidden file */
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#define ISYSTEM 0x08000000 /* system file */
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#define IDIRECTORY 0x20000000 /* directory (shadow of real bit) */
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#define IARCHIVE 0x40000000 /* file archive bit */
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#define INEWNAME 0x80000000 /* non-8.3 filename format */
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#define IRASH 0x4E000000 /* mask for changeable attributes */
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#define ATTRSHIFT 25 /* bits to shift to move attribute
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specification to mode position */
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/* extended attributes for Linux */
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#define JFS_NOATIME_FL 0x00080000 /* do not update atime */
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#define JFS_DIRSYNC_FL 0x00100000 /* dirsync behaviour */
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#define JFS_SYNC_FL 0x00200000 /* Synchronous updates */
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#define JFS_SECRM_FL 0x00400000 /* Secure deletion */
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#define JFS_UNRM_FL 0x00800000 /* allow for undelete */
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#define JFS_APPEND_FL 0x01000000 /* writes to file may only append */
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#define JFS_IMMUTABLE_FL 0x02000000 /* Immutable file */
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#define JFS_FL_USER_VISIBLE 0x03F80000
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#define JFS_FL_USER_MODIFIABLE 0x03F80000
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#define JFS_FL_INHERIT 0x03C80000
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#endif /*_H_JFS_DINODE */
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