From 381cacb12c009864993a072eedcc0720315aedbd Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 7 Oct 2014 17:11:46 -0700 Subject: [PATCH] mnt: Carefully set CL_UNPRIVILEGED in clone_mnt old->mnt_expiry should be ignored unless CL_EXPIRE is set. Signed-off-by: "Eric W. Biederman" --- fs/namespace.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/namespace.c b/fs/namespace.c index e8d1ffa7f132..f87a90b98da2 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -963,7 +963,8 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root, } /* Don't allow unprivileged users to reveal what is under a mount */ - if ((flag & CL_UNPRIVILEGED) && list_empty(&old->mnt_expire)) + if ((flag & CL_UNPRIVILEGED) && + (!(flag & CL_EXPIRE) || list_empty(&old->mnt_expire))) mnt->mnt.mnt_flags |= MNT_LOCKED; atomic_inc(&sb->s_active);