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" <ebiederm@xmission.com>
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@ -963,7 +963,8 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
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}
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/* Don't allow unprivileged users to reveal what is under a mount */
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if ((flag & CL_UNPRIVILEGED) && list_empty(&old->mnt_expire))
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if ((flag & CL_UNPRIVILEGED) &&
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(!(flag & CL_EXPIRE) || list_empty(&old->mnt_expire)))
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mnt->mnt.mnt_flags |= MNT_LOCKED;
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atomic_inc(&sb->s_active);
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