2a7dba391e
SELinux would like to implement a new labeling behavior of newly created inodes. We currently label new inodes based on the parent and the creating process. This new behavior would also take into account the name of the new object when deciding the new label. This is not the (supposed) full path, just the last component of the path. This is very useful because creating /etc/shadow is different than creating /etc/passwd but the kernel hooks are unable to differentiate these operations. We currently require that userspace realize it is doing some difficult operation like that and than userspace jumps through SELinux hoops to get things set up correctly. This patch does not implement new behavior, that is obviously contained in a seperate SELinux patch, but it does pass the needed name down to the correct LSM hook. If no such name exists it is fine to pass NULL. Signed-off-by: Eric Paris <eparis@redhat.com>
128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/*
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File: linux/ext2_xattr.h
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On-disk format of extended attributes for the ext2 filesystem.
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(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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#include <linux/init.h>
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#include <linux/xattr.h>
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/* Magic value in attribute blocks */
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#define EXT2_XATTR_MAGIC 0xEA020000
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/* Maximum number of references to one attribute block */
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#define EXT2_XATTR_REFCOUNT_MAX 1024
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/* Name indexes */
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#define EXT2_XATTR_INDEX_USER 1
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#define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2
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#define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3
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#define EXT2_XATTR_INDEX_TRUSTED 4
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#define EXT2_XATTR_INDEX_LUSTRE 5
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#define EXT2_XATTR_INDEX_SECURITY 6
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struct ext2_xattr_header {
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__le32 h_magic; /* magic number for identification */
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__le32 h_refcount; /* reference count */
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__le32 h_blocks; /* number of disk blocks used */
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__le32 h_hash; /* hash value of all attributes */
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__u32 h_reserved[4]; /* zero right now */
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};
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struct ext2_xattr_entry {
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__u8 e_name_len; /* length of name */
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__u8 e_name_index; /* attribute name index */
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__le16 e_value_offs; /* offset in disk block of value */
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__le32 e_value_block; /* disk block attribute is stored on (n/i) */
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__le32 e_value_size; /* size of attribute value */
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__le32 e_hash; /* hash value of name and value */
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char e_name[0]; /* attribute name */
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};
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#define EXT2_XATTR_PAD_BITS 2
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#define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS)
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#define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1)
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#define EXT2_XATTR_LEN(name_len) \
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(((name_len) + EXT2_XATTR_ROUND + \
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sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
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#define EXT2_XATTR_NEXT(entry) \
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( (struct ext2_xattr_entry *)( \
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(char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
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#define EXT2_XATTR_SIZE(size) \
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(((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)
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# ifdef CONFIG_EXT2_FS_XATTR
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extern const struct xattr_handler ext2_xattr_user_handler;
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extern const struct xattr_handler ext2_xattr_trusted_handler;
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extern const struct xattr_handler ext2_xattr_acl_access_handler;
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extern const struct xattr_handler ext2_xattr_acl_default_handler;
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extern const struct xattr_handler ext2_xattr_security_handler;
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extern ssize_t ext2_listxattr(struct dentry *, char *, size_t);
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extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t);
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extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
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extern void ext2_xattr_delete_inode(struct inode *);
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extern void ext2_xattr_put_super(struct super_block *);
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extern int init_ext2_xattr(void);
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extern void exit_ext2_xattr(void);
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extern const struct xattr_handler *ext2_xattr_handlers[];
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# else /* CONFIG_EXT2_FS_XATTR */
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static inline int
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ext2_xattr_get(struct inode *inode, int name_index,
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const char *name, void *buffer, size_t size)
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{
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return -EOPNOTSUPP;
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}
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static inline int
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ext2_xattr_set(struct inode *inode, int name_index, const char *name,
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const void *value, size_t size, int flags)
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{
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return -EOPNOTSUPP;
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}
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static inline void
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ext2_xattr_delete_inode(struct inode *inode)
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{
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}
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static inline void
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ext2_xattr_put_super(struct super_block *sb)
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{
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}
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static inline int
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init_ext2_xattr(void)
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{
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return 0;
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}
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static inline void
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exit_ext2_xattr(void)
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{
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}
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#define ext2_xattr_handlers NULL
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# endif /* CONFIG_EXT2_FS_XATTR */
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#ifdef CONFIG_EXT2_FS_SECURITY
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extern int ext2_init_security(struct inode *inode, struct inode *dir,
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const struct qstr *qstr);
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#else
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static inline int ext2_init_security(struct inode *inode, struct inode *dir,
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const struct qstr *qstr)
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{
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return 0;
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}
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#endif
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