ovl: xattr filter fix

a) ovl_need_xattr_filter() is wrong, we can have multiple lower layers
overlaid, all of which (except the lowest one) honouring the
"trusted.overlay.opaque" xattr.  So need to filter everything except the
bottom and the pure-upper layer.

b) we no longer can assume that inode is attached to dentry in
get/setxattr.

This patch unconditionally filters private xattrs to fix both of the above.
Performance impact for get/removexattrs is likely in the noise.

For listxattrs it might be measurable in pathological cases, but I very
much hope nobody cares.  If they do, we'll fix it then.

Reported-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: b96809173e94 ("security_d_instantiate(): move to the point prior to attaching dentry to inode")

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 0ed7c40..1dbeab6 100644 (file)
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -238,41 +238,27 @@ out:
        return err;
 }
 
-static bool ovl_need_xattr_filter(struct dentry *dentry,
-                                 enum ovl_path_type type)
-{
-       if ((type & (__OVL_PATH_PURE | __OVL_PATH_UPPER)) == __OVL_PATH_UPPER)
-               return S_ISDIR(dentry->d_inode->i_mode);
-       else
-               return false;
-}
-
 ssize_t ovl_getxattr(struct dentry *dentry, struct inode *inode,
                     const char *name, void *value, size_t size)
 {
-       struct path realpath;
-       enum ovl_path_type type = ovl_path_real(dentry, &realpath);
+       struct dentry *realdentry = ovl_dentry_real(dentry);
 
-       if (ovl_need_xattr_filter(dentry, type) && ovl_is_private_xattr(name))
+       if (ovl_is_private_xattr(name))
                return -ENODATA;
 
-       return vfs_getxattr(realpath.dentry, name, value, size);
+       return vfs_getxattr(realdentry, name, value, size);
 }
 
 ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
 {
-       struct path realpath;
-       enum ovl_path_type type = ovl_path_real(dentry, &realpath);
+       struct dentry *realdentry = ovl_dentry_real(dentry);
        ssize_t res;
        int off;
 
-       res = vfs_listxattr(realpath.dentry, list, size);
+       res = vfs_listxattr(realdentry, list, size);
        if (res <= 0 || size == 0)
                return res;
 
-       if (!ovl_need_xattr_filter(dentry, type))
-               return res;
-
        /* filter out private xattrs */
        for (off = 0; off < res;) {
                char *s = list + off;
@@ -302,7 +288,7 @@ int ovl_removexattr(struct dentry *dentry, const char *name)
                goto out;
 
        err = -ENODATA;
-       if (ovl_need_xattr_filter(dentry, type) && ovl_is_private_xattr(name))
+       if (ovl_is_private_xattr(name))
                goto out_drop_write;
 
        if (!OVL_TYPE_UPPER(type)) {