From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Kees Cook <keescook@chromium.org>,
linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, Jarkko Sakkinen <jarkko.sakkinen@intel.com>,
Matthew Garrett <mjg@redhat.com>,
Matt Fleming <matt.fleming@intel.com>,
Eric Northup <digitaleric@google.com>,
Dan Rosenberg <drosenberg@vsecurity.com>,
Julien Tinnes <jln@google.com>, Will Drewry <wad@chromium.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 3/3] x86: kernel base offset ASLR
Date: Mon, 08 Apr 2013 07:58:23 -0700 [thread overview]
Message-ID: <16dc4736-347a-4102-b21b-0e35e060108b@email.android.com> (raw)
In-Reply-To: <20130408115823.GC7513@gmail.com>
Not if we do it right, but there is a huge potential boot time penalty.
Ingo Molnar <mingo@kernel.org> wrote:
>
>* H. Peter Anvin <hpa@zytor.com> wrote:
>
>> On 04/05/2013 01:04 AM, Ingo Molnar wrote:
>> >
>> > Random runtime shuffling of the kernel image - is that possible
>with
>> > existing toolchains?
>> >
>>
>> Yes... the question is how much work we'd be willing to go through to
>make it
>> happen.
>>
>> One approach: the kernel already contains a linker -- used for
>modules -- and
>> the bulk of the kernel could actually be composed to a "pile of
>modules" that
>> gets linked on boot. This would provide very large amounts of
>randomness.
>
>Is there no code generation / micro-performance disadvantage to that?
>
>Thanks,
>
> Ingo
--
Sent from my mobile phone. Please excuse brevity and lack of formatting.
next prev parent reply other threads:[~2013-04-08 14:59 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 20:07 [PATCH 0/3] kernel ASLR Kees Cook
2013-04-04 20:07 ` [PATCH 1/3] x86: routines to choose random kernel base offset Kees Cook
2013-04-05 7:24 ` Ingo Molnar
2013-04-05 7:36 ` Ingo Molnar
2013-04-05 18:15 ` H. Peter Anvin
2013-04-04 20:07 ` [PATCH 2/3] x86: build reloc tool for both 64 and 32 bit Kees Cook
2013-04-05 7:13 ` Ingo Molnar
2013-04-04 20:07 ` [PATCH 3/3] x86: kernel base offset ASLR Kees Cook
2013-04-04 20:12 ` H. Peter Anvin
2013-04-04 20:19 ` Julien Tinnes
2013-04-04 20:23 ` Julien Tinnes
2013-04-04 20:27 ` H. Peter Anvin
2013-04-04 20:48 ` Julien Tinnes
2013-04-05 7:05 ` Ingo Molnar
2013-04-04 20:54 ` Kees Cook
2013-04-04 20:58 ` H. Peter Anvin
2013-04-04 21:00 ` Kees Cook
2013-04-04 21:01 ` H. Peter Anvin
2013-04-04 21:04 ` Eric Northup
2013-04-04 21:06 ` Kees Cook
2013-04-04 21:00 ` Julien Tinnes
2013-04-04 21:01 ` Eric Northup
2013-04-05 7:55 ` Ingo Molnar
2013-04-04 20:21 ` H. Peter Anvin
2013-04-04 20:47 ` Eric Northup
2013-04-05 1:08 ` H. Peter Anvin
2013-04-05 8:04 ` Ingo Molnar
2013-04-05 15:30 ` H. Peter Anvin
2013-04-08 11:58 ` Ingo Molnar
2013-04-08 14:58 ` H. Peter Anvin [this message]
2013-04-05 18:17 ` H. Peter Anvin
2013-04-05 20:01 ` Yinghai Lu
2013-04-05 20:05 ` H. Peter Anvin
2013-04-05 20:19 ` Yinghai Lu
2013-04-05 20:29 ` H. Peter Anvin
2013-04-05 7:11 ` Ingo Molnar
2013-04-05 22:06 ` Julien Tinnes
2013-04-05 22:08 ` H. Peter Anvin
2013-04-05 22:13 ` Julien Tinnes
2013-04-05 7:34 ` Ingo Molnar
2013-04-05 12:12 ` Jiri Kosina
2013-04-05 14:49 ` Borislav Petkov
2013-04-05 20:19 ` Julien Tinnes
2013-04-05 20:43 ` Borislav Petkov
2013-04-05 23:18 ` Kees Cook
2013-04-06 10:10 ` Borislav Petkov
2013-04-08 12:13 ` Ingo Molnar
2013-04-11 20:52 ` [PATCH 0/3] kernel ASLR H. Peter Anvin
2013-04-11 21:28 ` Kees Cook
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