Messages in this thread Patch in this message | | | From | Seth Forshee <> | Subject | [PATCH 1/2] fs: Allow bind mounts with locked children on permaenetly empty directories | Date | Wed, 9 Mar 2016 09:18:06 -0600 |
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Forbidding a bind mount due to a locked child on a permanently empty directory provides no security benefit since the directory cannot contain any contents which have been overmounted for security reasons.
Cc: stable@vger.kernel.org # v4.1+ Signed-off-by: Seth Forshee <seth.forshee@canonical.com> --- fs/namespace.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/namespace.c b/fs/namespace.c index 4fb1691b4355..930f5557b1d1 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -2065,6 +2065,8 @@ static bool has_locked_children(struct mount *mnt, struct dentry *dentry) list_for_each_entry(child, &mnt->mnt_mounts, mnt_child) { if (!is_subdir(child->mnt_mountpoint, dentry)) continue; + if (is_empty_dir_inode(child->mnt_mountpoint->d_inode)) + continue; if (child->mnt.mnt_flags & MNT_LOCKED) return true; -- 1.9.1
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