From: Ted Ts'o <tytso@mit.edu>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dan Rosenberg <drosenberg@vsecurity.com>,
"chas@cmf.nrl.navy.mil" <chas@cmf.nrl.navy.mil>,
"davem@davemloft.net" <davem@davemloft.net>,
"kuznet@ms2.inr.ac.ru" <kuznet@ms2.inr.ac.ru>,
"pekkas@netcore.fi" <pekkas@netcore.fi>,
"jmorris@namei.org" <jmorris@namei.org>,
"yoshfuji@linux-ipv6.org" <yoshfuji@linux-ipv6.org>,
"kaber@trash.net" <kaber@trash.net>,
"remi.denis-courmont@nokia.com" <remi.denis-courmont@nokia.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"security@kernel.org" <security@kernel.org>
Subject: Re: [Security] [SECURITY] Fix leaking of kernel heap addresses via /proc
Date: Sat, 6 Nov 2010 19:48:40 -0400 [thread overview]
Message-ID: <20101106234840.GD2935@thunk.org> (raw)
In-Reply-To: <AANLkTimC01SViEOObgf2N2VcLTYO59rOAbHaKf2RM54w@mail.gmail.com>
On Sat, Nov 06, 2010 at 01:50:32PM -0700, Linus Torvalds wrote:
> On Saturday, November 6, 2010, Dan Rosenberg <drosenberg@vsecurity.com> wrote:
> > Clearly, in most cases we cannot just remove the field from the /proc
> > output, as this would break a number of userspace programs that rely on
> > consistency. However, I propose that we replace the address with a "0"
> > rather than leaking this information.
>
> I really think it would be much better to use the unidentified number
> or similar.
>
> Just replacing with zeroes is annoying, and has the potential of
> losing actual information.
Are there any userspace programs that might be reasonably expected to
_use_ this information? If there is, we could just pick a random
number at boot time, and then XOR the heap adddress with that random
number.
- Ted
next prev parent reply other threads:[~2010-11-06 23:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-06 20:11 [SECURITY] Fix leaking of kernel heap addresses via /proc Dan Rosenberg
2010-11-06 20:50 ` [Security] " Linus Torvalds
2010-11-06 23:48 ` Ted Ts'o [this message]
2010-11-07 21:52 ` Andi Kleen
2010-11-07 22:48 ` Chas Williams (CONTRACTOR)
2010-11-07 23:14 ` Andi Kleen
2010-11-07 23:22 ` Linus Torvalds
2010-11-07 23:29 ` Andi Kleen
2010-11-07 23:27 ` Dan Rosenberg
2010-11-07 23:56 ` Andi Kleen
2010-11-08 2:01 ` David Miller
2010-11-08 7:33 ` Eric Dumazet
2010-11-08 9:43 ` Andi Kleen
2010-11-08 10:14 ` Eric Dumazet
2010-11-06 23:57 ` David Miller
2010-11-07 10:28 ` Oliver Hartkopp
2010-11-07 17:11 ` Ben Hutchings
2010-11-08 1:00 ` Willy Tarreau
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