From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id 4F5F49000BD for ; Tue, 27 Sep 2011 15:35:30 -0400 (EDT) Date: Tue, 27 Sep 2011 14:35:25 -0500 (CDT) From: Christoph Lameter Subject: Re: [PATCH 1/2] mm: restrict access to slab files under procfs and sysfs In-Reply-To: <20110927191658.GB4820@albatros> Message-ID: References: <20110927175453.GA3393@albatros> <20110927191658.GB4820@albatros> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Vasiliy Kulikov Cc: kernel-hardening@lists.openwall.com, 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 On Tue, 27 Sep 2011, Vasiliy Kulikov wrote: > On Tue, Sep 27, 2011 at 13:08 -0500, Christoph Lameter wrote: > > Possible candidates: > > > > christoph@oldy:~/n/linux-2.6$ grep proc_create mm/* > > mm/swapfile.c: proc_create("swaps", 0, NULL, &proc_swaps_operations); > > mm/vmstat.c: proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations); > > mm/vmstat.c: proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops); > > mm/vmstat.c: proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations); > > mm/vmstat.c: proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations); > > > > vmstat and zoneinfo in particular give similar information to what is > > revealed through the slab proc files. > > Do you know whether these files are actively used? I don't want to > break tools like "free" or "top". In this case we'll have to discover > another way to limit this information. top uses per process information. Tried an strace and I see no access to vmstat or zoneinfo. free uses /proc/meminfo not vmstat or zoneinfo. Since you already have a patch that limits /proc/meminfo access there is already an issue there. -- 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