linux-kernel - Re: [PATCH] userns: ptrace: incorporate feedback from Eric

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Message-Id: <20110223165651.cf248f3b.akpm@linux-foundation.org>
Date:	Wed, 23 Feb 2011 16:56:51 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	LSM <linux-security-module@...r.kernel.org>,
	James Morris <jmorris@...ei.org>,
	Kees Cook <kees.cook@...onical.com>,
	containers@...ts.linux-foundation.org,
	kernel list <linux-kernel@...r.kernel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Michael Kerrisk <mtk.manpages@...il.com>, xemul@...allels.com,
	dhowells@...hat.com
Subject: Re: [PATCH] userns: ptrace: incorporate feedback from Eric

On Thu, 24 Feb 2011 00:49:01 +0000
"Serge E. Hallyn" <serge@...lyn.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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