From 5d88457eb5b86b475422dc882f089203faaeedb5 Mon Sep 17 00:00:00 2001 From: Eric W. Biederman Date: Sat, 3 Jan 2015 05:39:35 -0600 Subject: mnt: On an unmount propagate clearing of MNT_LOCKED A prerequisite of calling umount_tree is that the point where the tree is mounted at is valid to unmount. If we are propagating the effect of the unmount clear MNT_LOCKED in every instance where the same filesystem is mounted on the same mountpoint in the mount tree, as we know (by virtue of the fact that umount_tree was called) that it is safe to reveal what is at that mountpoint. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" --- fs/namespace.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/namespace.c') diff --git a/fs/namespace.c b/fs/namespace.c index 083e3401a808..2b12b7a9455d 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1333,6 +1333,9 @@ static void umount_tree(struct mount *mnt, enum umount_tree_flags how) LIST_HEAD(tmp_list); struct mount *p; + if (how & UMOUNT_PROPAGATE) + propagate_mount_unlock(mnt); + /* Gather the mounts to umount */ for (p = mnt; p; p = next_mnt(p, mnt)) { p->mnt.mnt_flags |= MNT_UMOUNT; -- cgit v1.2.3-55-g7522