Date: Wed, 23 Feb 2011 16:56:51 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: "Serge E. Hallyn" <serge@hallyn.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        LSM <linux-security-module@vger.kernel.org>,
        James Morris <jmorris@namei.org>, Kees Cook <kees.cook@canonical.com>,
        containers@lists.linux-foundation.org,
        kernel list <linux-kernel@vger.kernel.org>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>, xemul@parallels.com,
        dhowells@redhat.com
Subject: Re: [PATCH] userns: ptrace: incorporate feedback from Eric
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On Thu, 24 Feb 2011 00:49:01 +0000
"Serge E. Hallyn" <serge@hallyn.com> wrote:

> same_or_ancestore_user_ns() was not an appropriate check to
> constrain cap_issubset.  Rather, cap_issubset() only is
> meaningful when both capsets are in the same user_ns.

I queued this as a fix against
userns-allow-ptrace-from-non-init-user-namespaces.patch, but I get the
feeling that it would be better to just drop everything and start
again?

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