mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
13a75c3abc
This makes it harder for accidental or malicious changes to jffs2_xattr_handlers at runtime. Cc: David Woodhouse <dwmw2@infradead.org> Cc: Richard Weinberger <richard@nod.at> Cc: linux-mtd@lists.infradead.org Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com> Link: https://lore.kernel.org/r/20230930050033.41174-16-wedsonaf@gmail.com Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/*
|
|
* JFFS2 -- Journalling Flash File System, Version 2.
|
|
*
|
|
* Copyright © 2006 NEC Corporation
|
|
*
|
|
* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
|
|
*
|
|
* For licensing information, see the file 'LICENCE' in this directory.
|
|
*
|
|
*/
|
|
|
|
#ifndef _JFFS2_FS_XATTR_H_
|
|
#define _JFFS2_FS_XATTR_H_
|
|
|
|
#include <linux/xattr.h>
|
|
#include <linux/list.h>
|
|
|
|
#define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */
|
|
#define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */
|
|
#define JFFS2_XFLAGS_DEAD (0x40) /* This datum is already dead */
|
|
#define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */
|
|
|
|
struct jffs2_xattr_datum
|
|
{
|
|
void *always_null;
|
|
struct jffs2_raw_node_ref *node;
|
|
uint8_t class;
|
|
uint8_t flags;
|
|
uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */
|
|
|
|
struct list_head xindex; /* chained from c->xattrindex[n] */
|
|
atomic_t refcnt; /* # of xattr_ref refers this */
|
|
uint32_t xid;
|
|
uint32_t version;
|
|
|
|
uint32_t data_crc;
|
|
uint32_t hashkey;
|
|
char *xname; /* XATTR name without prefix */
|
|
uint32_t name_len; /* length of xname */
|
|
char *xvalue; /* XATTR value */
|
|
uint32_t value_len; /* length of xvalue */
|
|
};
|
|
|
|
struct jffs2_inode_cache;
|
|
struct jffs2_xattr_ref
|
|
{
|
|
void *always_null;
|
|
struct jffs2_raw_node_ref *node;
|
|
uint8_t class;
|
|
uint8_t flags; /* Currently unused */
|
|
u16 unused;
|
|
|
|
uint32_t xseqno;
|
|
union {
|
|
struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */
|
|
uint32_t ino; /* only used in scanning/building */
|
|
};
|
|
union {
|
|
struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */
|
|
uint32_t xid; /* only used in sccanning/building */
|
|
};
|
|
struct jffs2_xattr_ref *next; /* chained from ic->xref_list */
|
|
};
|
|
|
|
#define XREF_DELETE_MARKER (0x00000001)
|
|
static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
|
|
{
|
|
return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
|
|
}
|
|
|
|
#ifdef CONFIG_JFFS2_FS_XATTR
|
|
|
|
extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
|
|
extern int jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
|
|
extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
|
|
|
|
extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
|
|
uint32_t xid, uint32_t version);
|
|
|
|
extern void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
|
|
extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
|
|
extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
|
|
|
|
extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
|
|
struct jffs2_raw_node_ref *raw);
|
|
extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
|
|
struct jffs2_raw_node_ref *raw);
|
|
extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
|
|
extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
|
|
extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
|
|
|
|
extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
|
|
char *buffer, size_t size);
|
|
extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
|
|
const char *buffer, size_t size, int flags);
|
|
|
|
extern const struct xattr_handler * const jffs2_xattr_handlers[];
|
|
extern const struct xattr_handler jffs2_user_xattr_handler;
|
|
extern const struct xattr_handler jffs2_trusted_xattr_handler;
|
|
|
|
extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
|
|
|
|
#else
|
|
|
|
#define jffs2_init_xattr_subsystem(c)
|
|
#define jffs2_build_xattr_subsystem(c) (0)
|
|
#define jffs2_clear_xattr_subsystem(c)
|
|
|
|
#define jffs2_xattr_do_crccheck_inode(c, ic)
|
|
#define jffs2_xattr_delete_inode(c, ic)
|
|
#define jffs2_xattr_free_inode(c, ic)
|
|
#define jffs2_verify_xattr(c) (1)
|
|
|
|
#define jffs2_xattr_handlers NULL
|
|
#define jffs2_listxattr NULL
|
|
|
|
#endif /* CONFIG_JFFS2_FS_XATTR */
|
|
|
|
#ifdef CONFIG_JFFS2_FS_SECURITY
|
|
extern int jffs2_init_security(struct inode *inode, struct inode *dir,
|
|
const struct qstr *qstr);
|
|
extern const struct xattr_handler jffs2_security_xattr_handler;
|
|
#else
|
|
#define jffs2_init_security(inode,dir,qstr) (0)
|
|
#endif /* CONFIG_JFFS2_FS_SECURITY */
|
|
|
|
#endif /* _JFFS2_FS_XATTR_H_ */
|