From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with ESMTP id EA4579000BD for ; Wed, 28 Sep 2011 17:46:19 -0400 (EDT) Received: by pzk4 with SMTP id 4so23053135pzk.6 for ; Wed, 28 Sep 2011 14:46:17 -0700 (PDT) Date: Wed, 28 Sep 2011 14:46:14 -0700 From: Andrew Morton Subject: Re: [PATCH 2/2] mm: restrict access to /proc/meminfo Message-Id: <20110928144614.38591e97.akpm00@gmail.com> In-Reply-To: <20110927193810.GA5416@albatros> References: <20110927175453.GA3393@albatros> <20110927175642.GA3432@albatros> <20110927193810.GA5416@albatros> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Vasiliy Kulikov Cc: kernel-hardening@lists.openwall.com, Christoph Lameter , Pekka Enberg , Matt Mackall , linux-mm@kvack.org, Kees Cook , Dave Hansen , Valdis.Kletnieks@vt.edu, Linus Torvalds , David Rientjes , Alan Cox , linux-kernel@vger.kernel.org, Andrew Morton On Tue, 27 Sep 2011 23:38:10 +0400 Vasiliy Kulikov wrote: > On Tue, Sep 27, 2011 at 21:56 +0400, Vasiliy Kulikov wrote: > > /proc/meminfo stores information related to memory pages usage, which > > may be used to monitor the number of objects in specific caches (and/or > > the changes of these numbers). This might reveal private information > > similar to /proc/slabinfo infoleaks. To remove the infoleak, just > > restrict meminfo to root. If it is used by unprivileged daemons, > > meminfo permissions can be altered the same way as slabinfo: > > > > groupadd meminfo > > usermod -a -G meminfo $MONITOR_USER > > chmod g+r /proc/meminfo > > chgrp meminfo /proc/meminfo > > Just to make it clear: since this patch breaks "free", I don't propose > it anymore. It will break top(1) too. It isn't my favoritest-ever patch :) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org