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Subject[PATCH 24/34] union-mount: Prevent bind mounts of union mounts
Date
Prevent bind mounts of parts of union mounts.

XXX - Bind mounting parts of union mounts is probably easy to
implement, but requires some careful thought about corner cases,
extensive testing, and some refactoring of the code.

Signed-off-by: Valerie Aurora <vaurora@redhat.com>
---
fs/namespace.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 26efaf3..e3629dd 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1761,6 +1761,12 @@ static int do_loopback(struct path *path, char *old_name,
err = -EINVAL;
if (IS_MNT_UNBINDABLE(old_path.mnt))
goto out;
+ /*
+ * XXX - Mounting a subtree of a union mount elsewhere
+ * requires careful thought and some refactoring.
+ */
+ if (IS_MNT_UNION(old_path.mnt))
+ goto out;

if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
goto out;
--
1.6.3.3


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