linux-kernel - Re: [RFC, PATCH] pagemap: do not leak physical addresses to non-privileged userspace

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Message-ID: <54FE589C.1050705@linux.intel.com>
Date:	Mon, 09 Mar 2015 19:36:12 -0700
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Kees Cook <keescook@...omium.org>
CC:	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Mark Seaborn <mseaborn@...omium.org>
Subject: Re: [RFC, PATCH] pagemap: do not leak physical addresses to non-privileged
 userspace

On 03/09/2015 05:19 PM, Andy Lutomirski wrote:
> per-pidns like this is no good.  You shouldn't be able to create a
> non-paranoid pidns if your parent is paranoid.

That sounds like a reasonable addition that shouldn't be hard to add.

> Also, at some point we need actual per-ns controls.  This mount option
> stuff is hideous.

So,

	per-pidns == bad
	per-ns == good

If the pid namespace is the wrong place, which namespace is the right place?


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