From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Dan Rosenberg <drosenberg@vsecurity.com>,
Tony Luck <tony.luck@gmail.com>,
linux-kernel@vger.kernel.org, davej@redhat.com,
kees.cook@canonical.com, davem@davemloft.net, eranian@google.com,
adobriyan@gmail.com, penberg@kernel.org,
Arjan van de Ven <arjan@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Valdis.Kletnieks@vt.edu, pageexec@freemail.hu
Subject: Re: [RFC][PATCH] Randomize kernel base address on boot
Date: Fri, 27 May 2011 10:06:42 -0700 [thread overview]
Message-ID: <4DDFDA22.205@zytor.com> (raw)
In-Reply-To: <20110527170045.GB4356@elte.hu>
On 05/27/2011 10:00 AM, Ingo Molnar wrote:
>
> The problem with your relinking solution is that a local attacker can
> easily figure out where the kernel is. So this does not protect
> against the more common break-in scenario.
>
There is another issue with it: it doesn't actually solve the real
problem other than suspend/resume, which is that the relocation agent
needs to understand what the memory space looks like at the time of boot.
I think something else we will need for this to be possible is initramfs
decoding directly from highmem, since the hack we're currently using to
deal with an initramfs/initrd located partly in highmem will break.
-hpa
next prev parent reply other threads:[~2011-05-27 17:07 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-24 20:31 [RFC][PATCH] Randomize kernel base address on boot Dan Rosenberg
2011-05-24 21:02 ` Ingo Molnar
2011-05-24 22:55 ` Dan Rosenberg
2011-05-24 21:16 ` Ingo Molnar
2011-05-24 23:00 ` Dan Rosenberg
2011-05-25 11:23 ` Ingo Molnar
2011-05-25 14:20 ` Dan Rosenberg
2011-05-25 14:29 ` Ingo Molnar
2011-05-24 23:06 ` H. Peter Anvin
2011-05-25 14:03 ` Dan Rosenberg
2011-05-25 14:14 ` Ingo Molnar
2011-05-25 15:48 ` H. Peter Anvin
2011-05-25 16:15 ` Dan Rosenberg
2011-05-25 16:24 ` H. Peter Anvin
2011-05-24 21:46 ` Brian Gerst
2011-05-24 23:01 ` Dan Rosenberg
2011-05-24 22:31 ` H. Peter Anvin
2011-05-24 23:04 ` Dan Rosenberg
2011-05-24 23:07 ` H. Peter Anvin
2011-05-24 23:34 ` Dan Rosenberg
2011-05-24 23:36 ` H. Peter Anvin
2011-05-24 23:14 ` H. Peter Anvin
2011-05-24 23:08 ` Dan Rosenberg
2011-05-25 2:05 ` Dan Rosenberg
2011-05-26 20:01 ` Vivek Goyal
2011-05-26 20:06 ` Dan Rosenberg
2011-05-26 20:16 ` Valdis.Kletnieks
2011-05-26 20:31 ` Vivek Goyal
2011-05-27 9:36 ` Ingo Molnar
2011-05-26 20:35 ` Vivek Goyal
2011-05-26 20:40 ` Vivek Goyal
2011-05-26 20:44 ` Dan Rosenberg
2011-05-26 20:55 ` Vivek Goyal
2011-05-27 9:38 ` Ingo Molnar
2011-05-27 13:07 ` Vivek Goyal
2011-05-27 13:38 ` Ingo Molnar
2011-05-27 13:13 ` Vivek Goyal
2011-05-27 13:21 ` Dan Rosenberg
2011-05-27 13:46 ` Ingo Molnar
2011-05-27 13:50 ` Vivek Goyal
2011-05-26 20:39 ` Dan Rosenberg
2011-05-27 7:15 ` Ingo Molnar
2011-05-31 16:52 ` Matthew Garrett
2011-05-31 18:40 ` H. Peter Anvin
2011-05-31 18:51 ` Matthew Garrett
2011-05-31 19:03 ` Dan Rosenberg
2011-05-31 19:07 ` H. Peter Anvin
2011-05-31 19:50 ` Ingo Molnar
2011-05-31 19:55 ` Ingo Molnar
2011-05-31 20:15 ` H. Peter Anvin
2011-05-31 20:27 ` Ingo Molnar
2011-05-31 20:30 ` H. Peter Anvin
2011-06-01 6:18 ` Ingo Molnar
2011-06-01 15:44 ` H. Peter Anvin
2011-05-31 20:17 ` Dan Rosenberg
2011-05-26 22:18 ` Rafael J. Wysocki
2011-05-26 22:32 ` H. Peter Anvin
2011-05-27 0:26 ` Dan Rosenberg
2011-05-27 16:21 ` Rafael J. Wysocki
2011-05-27 2:45 ` Dave Jones
2011-05-27 9:40 ` Ingo Molnar
2011-05-27 16:11 ` Rafael J. Wysocki
2011-05-27 16:07 ` Rafael J. Wysocki
2011-05-27 15:42 ` Linus Torvalds
2011-05-27 16:11 ` Dan Rosenberg
2011-05-27 17:00 ` Ingo Molnar
2011-05-27 17:06 ` H. Peter Anvin [this message]
2011-05-27 17:10 ` Dan Rosenberg
2011-05-27 17:13 ` H. Peter Anvin
2011-05-27 17:16 ` Linus Torvalds
2011-05-27 17:38 ` Ingo Molnar
2011-05-27 17:20 ` Kees Cook
2011-05-27 17:16 ` Ingo Molnar
2011-05-27 17:21 ` Linus Torvalds
2011-05-27 17:46 ` Ingo Molnar
2011-05-27 17:53 ` H. Peter Anvin
2011-05-27 18:05 ` Linus Torvalds
2011-05-27 19:15 ` Vivek Goyal
2011-05-27 21:37 ` H. Peter Anvin
2011-05-27 23:51 ` H. Peter Anvin
2011-05-28 12:18 ` Ingo Molnar
2011-05-29 1:13 ` H. Peter Anvin
2011-05-29 12:47 ` Ingo Molnar
2011-05-29 18:19 ` H. Peter Anvin
2011-05-29 18:44 ` Ingo Molnar
2011-05-29 18:52 ` H. Peter Anvin
2011-05-29 19:56 ` Ingo Molnar
2011-05-27 17:57 ` Linus Torvalds
2011-05-27 18:17 ` Ingo Molnar
2011-05-27 18:43 ` Kees Cook
2011-05-27 18:48 ` david
2011-05-27 21:51 ` Olivier Galibert
2011-05-27 22:11 ` Valdis.Kletnieks
2011-05-28 0:50 ` H. Peter Anvin
2011-05-28 6:32 ` Ingo Molnar
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