return result;
}
+struct filename *
+getname_uflags(const char __user *filename, int uflags)
+{
+ int flags = (uflags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0;
+
+ return getname_flags(filename, flags, NULL);
+}
+
struct filename *
getname(const char __user * filename)
{
return err;
}
-int filename_lookup(int dfd, struct filename *name, unsigned flags,
+static int __filename_lookup(int dfd, struct filename *name, unsigned flags,
struct path *path, struct path *root)
{
int retval;
audit_inode(name, path->dentry,
flags & LOOKUP_MOUNTPOINT ? AUDIT_INODE_NOEVAL : 0);
restore_nameidata();
+ return retval;
+}
+
+int filename_lookup(int dfd, struct filename *name, unsigned flags,
+ struct path *path, struct path *root)
+{
+ int retval = __filename_lookup(dfd, name, flags, path, root);
+
putname(name);
return retval;
}
}
EXPORT_SYMBOL(vfs_path_lookup);
-static int lookup_one_len_common(const char *name, struct dentry *base,
- int len, struct qstr *this)
+static int lookup_one_common(struct user_namespace *mnt_userns,
+ const char *name, struct dentry *base, int len,
+ struct qstr *this)
{
this->name = name;
this->len = len;
return err;
}
- return inode_permission(&init_user_ns, base->d_inode, MAY_EXEC);
+ return inode_permission(mnt_userns, base->d_inode, MAY_EXEC);
}
/**
WARN_ON_ONCE(!inode_is_locked(base->d_inode));
- err = lookup_one_len_common(name, base, len, &this);
+ err = lookup_one_common(&init_user_ns, name, base, len, &this);
if (err)
return ERR_PTR(err);
WARN_ON_ONCE(!inode_is_locked(base->d_inode));
- err = lookup_one_len_common(name, base, len, &this);
+ err = lookup_one_common(&init_user_ns, name, base, len, &this);
if (err)
return ERR_PTR(err);
}
EXPORT_SYMBOL(lookup_one_len);
+/**
+ * lookup_one - filesystem helper to lookup single pathname component
+ * @mnt_userns: user namespace of the mount the lookup is performed from
+ * @name: pathname component to lookup
+ * @base: base directory to lookup from
+ * @len: maximum length @len should be interpreted to
+ *
+ * Note that this routine is purely a helper for filesystem usage and should
+ * not be called by generic code.
+ *
+ * The caller must hold base->i_mutex.
+ */
+struct dentry *lookup_one(struct user_namespace *mnt_userns, const char *name,
+ struct dentry *base, int len)
+{
+ struct dentry *dentry;
+ struct qstr this;
+ int err;
+
+ WARN_ON_ONCE(!inode_is_locked(base->d_inode));
+
+ err = lookup_one_common(mnt_userns, name, base, len, &this);
+ if (err)
+ return ERR_PTR(err);
+
+ dentry = lookup_dcache(&this, base, 0);
+ return dentry ? dentry : __lookup_slow(&this, base, 0);
+}
+EXPORT_SYMBOL(lookup_one);
+
/**
* lookup_one_len_unlocked - filesystem helper to lookup single pathname component
* @name: pathname component to lookup
int err;
struct dentry *ret;
- err = lookup_one_len_common(name, base, len, &this);
+ err = lookup_one_common(&init_user_ns, name, base, len, &this);
if (err)
return ERR_PTR(err);
/*
* Refuse to truncate files with mandatory locks held on them.
*/
- error = locks_verify_locked(filp);
- if (!error)
- error = security_path_truncate(path);
+ error = security_path_truncate(path);
if (!error) {
error = do_truncate(mnt_userns, path->dentry, 0,
ATTR_MTIME|ATTR_CTIME|ATTR_OPEN,
}
}
-static long do_mknodat(int dfd, const char __user *filename, umode_t mode,
+static int do_mknodat(int dfd, struct filename *name, umode_t mode,
unsigned int dev)
{
struct user_namespace *mnt_userns;
error = may_mknod(mode);
if (error)
- return error;
+ goto out1;
retry:
- dentry = user_path_create(dfd, filename, &path, lookup_flags);
+ dentry = __filename_create(dfd, name, &path, lookup_flags);
+ error = PTR_ERR(dentry);
if (IS_ERR(dentry))
- return PTR_ERR(dentry);
+ goto out1;
if (!IS_POSIXACL(path.dentry->d_inode))
mode &= ~current_umask();
error = security_path_mknod(&path, dentry, mode, dev);
if (error)
- goto out;
+ goto out2;
mnt_userns = mnt_user_ns(path.mnt);
switch (mode & S_IFMT) {
dentry, mode, 0);
break;
}
-out:
+out2:
done_path_create(&path, dentry);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
+out1:
+ putname(name);
return error;
}
SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode,
unsigned int, dev)
{
- return do_mknodat(dfd, filename, mode, dev);
+ return do_mknodat(dfd, getname(filename), mode, dev);
}
SYSCALL_DEFINE3(mknod, const char __user *, filename, umode_t, mode, unsigned, dev)
{
- return do_mknodat(AT_FDCWD, filename, mode, dev);
+ return do_mknodat(AT_FDCWD, getname(filename), mode, dev);
}
/**
}
EXPORT_SYMBOL(vfs_mkdir);
-long do_mkdirat(int dfd, struct filename *name, umode_t mode)
+int do_mkdirat(int dfd, struct filename *name, umode_t mode)
{
struct dentry *dentry;
struct path path;
}
EXPORT_SYMBOL(vfs_rmdir);
-long do_rmdir(int dfd, struct filename *name)
+int do_rmdir(int dfd, struct filename *name)
{
struct user_namespace *mnt_userns;
int error;
* writeout happening, and we don't want to prevent access to the directory
* while waiting on the I/O.
*/
-long do_unlinkat(int dfd, struct filename *name)
+int do_unlinkat(int dfd, struct filename *name)
{
int error;
struct dentry *dentry;
}
EXPORT_SYMBOL(vfs_symlink);
-static long do_symlinkat(const char __user *oldname, int newdfd,
- const char __user *newname)
+int do_symlinkat(struct filename *from, int newdfd, struct filename *to)
{
int error;
- struct filename *from;
struct dentry *dentry;
struct path path;
unsigned int lookup_flags = 0;
- from = getname(oldname);
- if (IS_ERR(from))
- return PTR_ERR(from);
+ if (IS_ERR(from)) {
+ error = PTR_ERR(from);
+ goto out_putnames;
+ }
retry:
- dentry = user_path_create(newdfd, newname, &path, lookup_flags);
+ dentry = __filename_create(newdfd, to, &path, lookup_flags);
error = PTR_ERR(dentry);
if (IS_ERR(dentry))
- goto out_putname;
+ goto out_putnames;
error = security_path_symlink(&path, dentry, from->name);
if (!error) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
-out_putname:
+out_putnames:
+ putname(to);
putname(from);
return error;
}
SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
int, newdfd, const char __user *, newname)
{
- return do_symlinkat(oldname, newdfd, newname);
+ return do_symlinkat(getname(oldname), newdfd, getname(newname));
}
SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newname)
{
- return do_symlinkat(oldname, AT_FDCWD, newname);
+ return do_symlinkat(getname(oldname), AT_FDCWD, getname(newname));
}
/**
* with linux 2.0, and to avoid hard-linking to directories
* and other special files. --ADM
*/
-static int do_linkat(int olddfd, const char __user *oldname, int newdfd,
- const char __user *newname, int flags)
+int do_linkat(int olddfd, struct filename *old, int newdfd,
+ struct filename *new, int flags)
{
struct user_namespace *mnt_userns;
struct dentry *new_dentry;
int how = 0;
int error;
- if ((flags & ~(AT_SYMLINK_FOLLOW | AT_EMPTY_PATH)) != 0)
- return -EINVAL;
+ if ((flags & ~(AT_SYMLINK_FOLLOW | AT_EMPTY_PATH)) != 0) {
+ error = -EINVAL;
+ goto out_putnames;
+ }
/*
* To use null names we require CAP_DAC_READ_SEARCH
* This ensures that not everyone will be able to create
* handlink using the passed filedescriptor.
*/
- if (flags & AT_EMPTY_PATH) {
- if (!capable(CAP_DAC_READ_SEARCH))
- return -ENOENT;
- how = LOOKUP_EMPTY;
+ if (flags & AT_EMPTY_PATH && !capable(CAP_DAC_READ_SEARCH)) {
+ error = -ENOENT;
+ goto out_putnames;
}
if (flags & AT_SYMLINK_FOLLOW)
how |= LOOKUP_FOLLOW;
retry:
- error = user_path_at(olddfd, oldname, how, &old_path);
+ error = __filename_lookup(olddfd, old, how, &old_path, NULL);
if (error)
- return error;
+ goto out_putnames;
- new_dentry = user_path_create(newdfd, newname, &new_path,
+ new_dentry = __filename_create(newdfd, new, &new_path,
(how & LOOKUP_REVAL));
error = PTR_ERR(new_dentry);
if (IS_ERR(new_dentry))
- goto out;
+ goto out_putpath;
error = -EXDEV;
if (old_path.mnt != new_path.mnt)
how |= LOOKUP_REVAL;
goto retry;
}
-out:
+out_putpath:
path_put(&old_path);
+out_putnames:
+ putname(old);
+ putname(new);
return error;
}
SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
int, newdfd, const char __user *, newname, int, flags)
{
- return do_linkat(olddfd, oldname, newdfd, newname, flags);
+ return do_linkat(olddfd, getname_uflags(oldname, flags),
+ newdfd, getname(newname), flags);
}
SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname)
{
- return do_linkat(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
+ return do_linkat(AT_FDCWD, getname(oldname), AT_FDCWD, getname(newname), 0);
}
/**
projects / linux-2.6-microblaze.git / blobdiff