Techwizz/kernel-fxtec-pro1x
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mnt: Move the clear of MNT_LOCKED from copy_tree to it's callers.

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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@xmission.com>
This commit is contained in:
Eric W. Biederman 2014-10-07 16:22:52 -07:00
parent da362b09e4
commit 8486a7882b
2 changed files with 1 additions and 1 deletions
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1
fs/namespace.c
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@ -1613,7 +1613,6 @@ 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;

1
fs/pnode.c
View file

@ -242,6 +242,7 @@ static int propagate_one(struct mount *m)
child = copy_tree(last_source, last_source->mnt.mnt_root, type);
if (IS_ERR(child))
return PTR_ERR(child);
child->mnt.mnt_flags &= ~MNT_LOCKED;
mnt_set_mountpoint(m, mp, child);
last_dest = m;
last_source = child;