Date: Wed, 14 Sep 2011 11:24:40 -0700 From: Dave Hansen <dave@...ux.vnet.ibm.com> To: Vasiliy Kulikov <segoon@...nwall.com> Cc: kernel-hardening@...ts.openwall.com, Andrew Morton <akpm@...ux-foundation.org>, Cyrill Gorcunov <gorcunov@...il.com>, Al Viro <viro@...iv.linux.org.uk>, Christoph Lameter <cl@...ux-foundation.org>, Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Dan Rosenberg <drosenberg@...curity.com>, Theodore Tso <tytso@....edu>, Alan Cox <alan@...ux.intel.com>, Jesper Juhl <jj@...osbits.net>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: Re: [RFC PATCH 2/2] mm: restrict access to /proc/slabinfo On Wed, 2011-09-14 at 19:42 +0400, Vasiliy Kulikov wrote: > > In other words, I dunno. If we do this in the kernel, can we at least > > do something like CONFIG_INSECURE to both track these kinds of things > > and make it easy to get them out of a developer's way? > > What do you think about adding your user to the slabinfo's group or > chmod it - quite the opposite Ubuntu currently does? I think it is more > generic (e.g. you may chmod 0444 to allow all users to get debug > information or just 0440 and chgrp admin to allow only trusted users to > do it) and your local policy doesn't touch the kernel. That obviously _works_. I'd be happy to ack your patch. As I said, it's pretty minimally painful, even to folks who care about slabinfo like me. -- Dave
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