diff options
Diffstat (limited to 'fs/overlayfs/namei.c')
| -rw-r--r-- | fs/overlayfs/namei.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index b00d909e7326..c6c79753b3b3 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -439,16 +439,13 @@ int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index) /* * Directory index entries are going to be used for looking up * redirected upper dirs by lower dir fh when decoding an overlay - * file handle of a merge dir. Whiteout index entries are going to be - * used as an indication that an exported overlay file handle should - * be treated as stale (i.e. after unlink of the overlay inode). - * We don't know the verification rules for directory and whiteout - * index entries, because they have not been implemented yet, so return - * EINVAL if those entries are found to abort the mount to avoid - * corrupting an index that was created by a newer kernel. + * file handle of a merge dir. We don't know the verification rules + * for directory index entries, because they have not been implemented + * yet, so return EINVAL if those entries are found to abort the mount + * and to avoid corrupting an index that was created by a newer kernel. */ err = -EINVAL; - if (d_is_dir(index) || ovl_is_whiteout(index)) + if (d_is_dir(index)) goto fail; if (index->d_name.len < sizeof(struct ovl_fh)*2) @@ -468,6 +465,14 @@ int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index) if (err) goto fail; + /* + * Whiteout index entries are used as an indication that an exported + * overlay file handle should be treated as stale (i.e. after unlink + * of the overlay inode). These entries contain no origin xattr. + */ + if (ovl_is_whiteout(index)) + goto out; + err = ovl_verify_fh(index, OVL_XATTR_ORIGIN, fh); if (err) goto fail; |