linux-kernel - Re: [1/2] vmalloc: Show vmalloced areas via /proc/vmallocinfo

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Message-Id: <20080321151935.6a330536.akpm@linux-foundation.org>
Date:	Fri, 21 Mar 2008 15:19:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	arjan@...radead.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [1/2] vmalloc: Show vmalloced areas via /proc/vmallocinfo

On Thu, 20 Mar 2008 12:22:07 -0700 (PDT)
Christoph Lameter <clameter@....com> wrote:

> On Wed, 19 Mar 2008, Arjan van de Ven wrote:
> 
> > > +	proc_create("vmallocinfo",S_IWUSR|S_IRUGO, NULL,
> > why should non-root be able to read this? sounds like a security issue (info leak) to me...

What is the security concern here?  This objection is rather vague.

> Well I copied from the slabinfo logic (leaking info for slabs is okay?).
> 
> Lets restrict it to root then:
> 
> 
> 
> Subject: vmallocinfo: Only allow root to read /proc/vmallocinfo
> 
> Change permissions for /proc/vmallocinfo to only allow read
> for root.

That makes the feature somewhat less useful.  Let's think this through more
carefully - it is, after all, an unrevokable, unalterable addition to the
kernel ABI.

Arjan, what scenarios are you thinking about?
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