mirror of
https://github.com/torvalds/linux.git
synced 2025-10-31 08:38:45 +02:00
ce78a1ec1c
This makes it harder for accidental or malicious changes to ext2_xattr_handlers or ext2_xattr_handler_map at runtime. Cc: Jan Kara <jack@suse.com> Cc: linux-ext4@vger.kernel.org Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com> Link: https://lore.kernel.org/r/20230930050033.41174-10-wedsonaf@gmail.com Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org>
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
File: linux/ext2_xattr.h
|
|
|
|
On-disk format of extended attributes for the ext2 filesystem.
|
|
|
|
(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/xattr.h>
|
|
|
|
/* Magic value in attribute blocks */
|
|
#define EXT2_XATTR_MAGIC 0xEA020000
|
|
|
|
/* Maximum number of references to one attribute block */
|
|
#define EXT2_XATTR_REFCOUNT_MAX 1024
|
|
|
|
/* Name indexes */
|
|
#define EXT2_XATTR_INDEX_USER 1
|
|
#define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2
|
|
#define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3
|
|
#define EXT2_XATTR_INDEX_TRUSTED 4
|
|
#define EXT2_XATTR_INDEX_LUSTRE 5
|
|
#define EXT2_XATTR_INDEX_SECURITY 6
|
|
|
|
struct ext2_xattr_header {
|
|
__le32 h_magic; /* magic number for identification */
|
|
__le32 h_refcount; /* reference count */
|
|
__le32 h_blocks; /* number of disk blocks used */
|
|
__le32 h_hash; /* hash value of all attributes */
|
|
__u32 h_reserved[4]; /* zero right now */
|
|
};
|
|
|
|
struct ext2_xattr_entry {
|
|
__u8 e_name_len; /* length of name */
|
|
__u8 e_name_index; /* attribute name index */
|
|
__le16 e_value_offs; /* offset in disk block of value */
|
|
__le32 e_value_block; /* disk block attribute is stored on (n/i) */
|
|
__le32 e_value_size; /* size of attribute value */
|
|
__le32 e_hash; /* hash value of name and value */
|
|
char e_name[]; /* attribute name */
|
|
};
|
|
|
|
#define EXT2_XATTR_PAD_BITS 2
|
|
#define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS)
|
|
#define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1)
|
|
#define EXT2_XATTR_LEN(name_len) \
|
|
(((name_len) + EXT2_XATTR_ROUND + \
|
|
sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
|
|
#define EXT2_XATTR_NEXT(entry) \
|
|
( (struct ext2_xattr_entry *)( \
|
|
(char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
|
|
#define EXT2_XATTR_SIZE(size) \
|
|
(((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)
|
|
|
|
struct mb_cache;
|
|
|
|
# ifdef CONFIG_EXT2_FS_XATTR
|
|
|
|
extern const struct xattr_handler ext2_xattr_user_handler;
|
|
extern const struct xattr_handler ext2_xattr_trusted_handler;
|
|
extern const struct xattr_handler ext2_xattr_security_handler;
|
|
|
|
extern ssize_t ext2_listxattr(struct dentry *, char *, size_t);
|
|
|
|
extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t);
|
|
extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
|
|
|
|
extern void ext2_xattr_delete_inode(struct inode *);
|
|
|
|
extern struct mb_cache *ext2_xattr_create_cache(void);
|
|
extern void ext2_xattr_destroy_cache(struct mb_cache *cache);
|
|
|
|
extern const struct xattr_handler * const ext2_xattr_handlers[];
|
|
|
|
# else /* CONFIG_EXT2_FS_XATTR */
|
|
|
|
static inline int
|
|
ext2_xattr_get(struct inode *inode, int name_index,
|
|
const char *name, void *buffer, size_t size)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int
|
|
ext2_xattr_set(struct inode *inode, int name_index, const char *name,
|
|
const void *value, size_t size, int flags)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline void
|
|
ext2_xattr_delete_inode(struct inode *inode)
|
|
{
|
|
}
|
|
|
|
static inline void ext2_xattr_destroy_cache(struct mb_cache *cache)
|
|
{
|
|
}
|
|
|
|
#define ext2_xattr_handlers NULL
|
|
#define ext2_listxattr NULL
|
|
|
|
# endif /* CONFIG_EXT2_FS_XATTR */
|
|
|
|
#ifdef CONFIG_EXT2_FS_SECURITY
|
|
extern int ext2_init_security(struct inode *inode, struct inode *dir,
|
|
const struct qstr *qstr);
|
|
#else
|
|
static inline int ext2_init_security(struct inode *inode, struct inode *dir,
|
|
const struct qstr *qstr)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|