security/apparmor/path.c

15 #include <linux/path.h>
21 #include "include/path.h"
37 /* If the path is not connected to the expected root,
41  *     specifically directed to connect the path,
43  *     if in a chroot and doing chroot relative paths and the path
48 static int disconnect(const struct path *path, char *buf, char **name,
55 	      our_mnt(path->mnt))) {
56 		/* disconnected path, don't return pathname starting
75  * d_namespace_path - lookup a name associated with a given path
76  * @path: path to lookup  (NOT NULL)
77  * @buf:  buffer to store path to  (NOT NULL)
78  * @name: Returns - pointer for start of path name with in @buf (NOT NULL)
79  * @flags: flags controlling path lookup
82  * Handle path name lookup.
84  * Returns: %0 else error code if path lookup fails
85  *          When no error the path name is returned in @name which points to
88 static int d_namespace_path(const struct path *path, char *buf, char **name,
97 	if (path->mnt->mnt_flags & MNT_INTERNAL) {
99 		res = dentry_path(path->dentry, buf, buflen);
105 		if (path->dentry->d_sb->s_magic == PROC_SUPER_MAGIC &&
113 			error = disconnect(path, buf, name, flags,
120 		struct path root;
122 		res = __d_path(path, &root, buf, buflen);
125 		res = d_absolute_path(path, buf, buflen);
126 		if (!our_mnt(path->mnt))
130 	/* handle error conditions - and still allow a partial path to
140 		res = dentry_path_raw(path->dentry, buf, buflen);
146 	} else if (!our_mnt(path->mnt))
152 		error = disconnect(path, buf, name, flags, disconnected);
160 	if (d_unlinked(path->dentry) && d_is_positive(path->dentry) &&
179  * @path: path the file  (NOT NULL)
180  * @flags: flags controlling path name generation
182  * @name: Returns - the generated path name if !error (NOT NULL)
183  * @info: Returns - information on why the path lookup failed (MAYBE NULL)
197 int aa_path_name(const struct path *path, int flags, char *buffer,
201 	int error = d_namespace_path(path, buffer, &str, flags, disconnected);
207 			*info = "Failed name lookup - disconnected path";