[PATCH 3.18 50/52] Dont leak MNT_INTERNAL away from internal mounts

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Al Viro <v...@zeniv.linux.org.uk>

commit 16a34adb9392b2fe4195267475ab5b472e55292c upstream.

We want it only for the stuff created by SB_KERNMOUNT mounts, *not* for
their copies.  As it is, creating a deep stack of bindings of /proc/*/ns/*
somewhere in a new namespace and exiting yields a stack overflow.

Cc: sta...@kernel.org
Reported-by: Alexander Aring <ar...@mojatatu.com>
Bisected-by: Kirill Tkhai <ktk...@virtuozzo.com>
Tested-by: Kirill Tkhai <ktk...@virtuozzo.com>
Tested-by: Alexander Aring <ar...@mojatatu.com>
Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/namespace.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -944,7 +944,8 @@ static struct mount *clone_mnt(struct mo
                        goto out_free;
        }
 
-       mnt->mnt.mnt_flags = old->mnt.mnt_flags & ~(MNT_WRITE_HOLD|MNT_MARKED);
+       mnt->mnt.mnt_flags = old->mnt.mnt_flags;
+       mnt->mnt.mnt_flags &= ~(MNT_WRITE_HOLD|MNT_MARKED|MNT_INTERNAL);
        /* Don't allow unprivileged users to change mount flags */
        if (flag & CL_UNPRIVILEGED) {
                mnt->mnt.mnt_flags |= MNT_LOCK_ATIME;