057f6c019f
Prevent permission checking from being performed when the kernel wants to unconditionally remove a sysfs group, by introducing an kernel-only variant of lookup_one_len(), lookup_one_len_kern(). Additionally, as sysfs_remove_group() does not check the return value of the lookup before using it, a BUG_ON has been added to pinpoint the cause of any problems potentially caused by this (and as a form of annotation). Signed-off-by: James Morris <jmorris@namei.org> Cc: Nagendra Singh Tomar <nagendra_tomar@adaptec.com> Cc: Tejun Heo <htejun@gmail.com> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: Eric Paris <eparis@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
103 lines
3 KiB
C
103 lines
3 KiB
C
#ifndef _LINUX_NAMEI_H
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#define _LINUX_NAMEI_H
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#include <linux/dcache.h>
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#include <linux/linkage.h>
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struct vfsmount;
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struct open_intent {
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int flags;
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int create_mode;
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struct file *file;
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};
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enum { MAX_NESTED_LINKS = 8 };
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struct nameidata {
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struct dentry *dentry;
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struct vfsmount *mnt;
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struct qstr last;
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unsigned int flags;
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int last_type;
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unsigned depth;
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char *saved_names[MAX_NESTED_LINKS + 1];
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/* Intent data */
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union {
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struct open_intent open;
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} intent;
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};
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struct path {
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struct vfsmount *mnt;
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struct dentry *dentry;
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};
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/*
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* Type of the last component on LOOKUP_PARENT
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*/
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enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
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/*
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* The bitmask for a lookup event:
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* - follow links at the end
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* - require a directory
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* - ending slashes ok even for nonexistent files
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* - internal "there are more path compnents" flag
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* - locked when lookup done with dcache_lock held
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* - dentry cache is untrusted; force a real lookup
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*/
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#define LOOKUP_FOLLOW 1
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#define LOOKUP_DIRECTORY 2
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#define LOOKUP_CONTINUE 4
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#define LOOKUP_PARENT 16
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#define LOOKUP_NOALT 32
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#define LOOKUP_REVAL 64
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/*
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* Intent data
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*/
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#define LOOKUP_OPEN (0x0100)
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#define LOOKUP_CREATE (0x0200)
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#define LOOKUP_ACCESS (0x0400)
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#define LOOKUP_CHDIR (0x0800)
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extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
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extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *));
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#define user_path_walk(name,nd) \
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__user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
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#define user_path_walk_link(name,nd) \
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__user_walk_fd(AT_FDCWD, name, 0, nd)
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extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *));
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extern int FASTCALL(path_walk(const char *, struct nameidata *));
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extern int FASTCALL(link_path_walk(const char *, struct nameidata *));
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extern void path_release(struct nameidata *);
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extern void path_release_on_umount(struct nameidata *);
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extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags);
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extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
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extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
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int (*open)(struct inode *, struct file *));
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extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
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extern void release_open_intent(struct nameidata *);
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extern struct dentry * lookup_one_len(const char *, struct dentry *, int);
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extern struct dentry *lookup_one_len_kern(const char *, struct dentry *, int);
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extern int follow_down(struct vfsmount **, struct dentry **);
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extern int follow_up(struct vfsmount **, struct dentry **);
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extern struct dentry *lock_rename(struct dentry *, struct dentry *);
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extern void unlock_rename(struct dentry *, struct dentry *);
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static inline void nd_set_link(struct nameidata *nd, char *path)
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{
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nd->saved_names[nd->depth] = path;
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}
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static inline char *nd_get_link(struct nameidata *nd)
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{
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return nd->saved_names[nd->depth];
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}
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#endif /* _LINUX_NAMEI_H */
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