From a888db310195400f050b89c47673f0f8babfbb41 Mon Sep 17 00:00:00 2001 From: Amir Goldstein Date: Wed, 8 Jul 2020 16:16:13 +0300 Subject: [PATCH] ovl: fix regression with re-formatted lower squashfs Commit 9df085f3c9a2 ("ovl: relax requirement for non null uuid of lower fs") relaxed the requirement for non null uuid with single lower layer to allow enabling index and nfs_export features with single lower squashfs. Fabian reported a regression in a setup when overlay re-uses an existing upper layer and re-formats the lower squashfs image. Because squashfs has no uuid, the origin xattr in upper layer are decoded from the new lower layer where they may resolve to a wrong origin file and user may get an ESTALE or EIO error on lookup. To avoid the reported regression while still allowing the new features with single lower squashfs, do not allow decoding origin with lower null uuid unless user opted-in to one of the new features that require following the lower inode of non-dir upper (index, xino, metacopy). Reported-by: Fabian Link: https://lore.kernel.org/linux-unionfs/32532923.JtPX5UtSzP@fgdesktop/ Fixes: 9df085f3c9a2 ("ovl: relax requirement for non null uuid of lower fs") Cc: stable@vger.kernel.org # v4.20+ Signed-off-by: Amir Goldstein Signed-off-by: Miklos Szeredi --- fs/overlayfs/super.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 31ef24dfcf88..94ca095b2a9e 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -1402,6 +1402,18 @@ static bool ovl_lower_uuid_ok(struct ovl_fs *ofs, const uuid_t *uuid) if (!ofs->config.nfs_export && !ovl_upper_mnt(ofs)) return true; + /* + * We allow using single lower with null uuid for index and nfs_export + * for example to support those features with single lower squashfs. + * To avoid regressions in setups of overlay with re-formatted lower + * squashfs, do not allow decoding origin with lower null uuid unless + * user opted-in to one of the new features that require following the + * lower inode of non-dir upper. + */ + if (!ofs->config.index && !ofs->config.metacopy && !ofs->config.xino && + uuid_is_null(uuid)) + return false; + for (i = 0; i < ofs->numfs; i++) { /* * We use uuid to associate an overlay lower file handle with a