From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 8486a7882b5ba906992fd78bbfcefaae7fe285cc upstream.
Clear MNT_LOCKED in the callers of copy_tree except copy_mnt_ns, and
collect_mounts. In copy_mnt_ns it is necessary to create an exact
copy of a mount tree, so not clearing MNT_LOCKED is important.
Similarly collect_mounts is used to take a snapshot of the mount tree
for audit logging purposes and auditing using a faithful copy of the
tree is important.
This becomes particularly significant when we start setting MNT_LOCKED
on rootfs to prevent it from being unmounted.
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Acked-by: NeilBrown <neilb@xxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
fs/namespace.c | 1 -
fs/pnode.c | 1 +
2 files changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index d727b0ce11df..f67473272010 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1416,7 +1416,6 @@ struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
if (IS_ERR(q))
return q;
- q->mnt.mnt_flags &= ~MNT_LOCKED;
q->mnt_mountpoint = mnt->mnt_mountpoint;
p = mnt;
diff --git a/fs/pnode.c b/fs/pnode.c
index 9af0df15256e..509d046e2b3e 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -249,6 +249,7 @@ int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp,
list_splice(tree_list, tmp_list.prev);
goto out;
}
+ child->mnt.mnt_flags &= ~MNT_LOCKED;
if (is_subdir(dest_mp->m_dentry, m->mnt.mnt_root)) {
mnt_set_mountpoint(m, dest_mp, child);
--
2.8.1
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