From: "H. Peter Anvin" <hpa@zytor.com>
To: Kees Cook <keescook@chromium.org>, Pavel Machek <pavel@ucw.cz>
Cc: LKML <linux-kernel@vger.kernel.org>,
Randy Dunlap <rdunlap@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "x86@kernel.org" <x86@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>,
Wei Yongjun <yongjun_wei@trendmicro.com.cn>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
linux-pm@vger.kernel.org
Subject: Re: [PATCH 0/2] make kASLR vs hibernation boot-time selectable
Date: Fri, 13 Jun 2014 10:36:50 -0700 [thread overview]
Message-ID: <539B36B2.8090701@zytor.com> (raw)
In-Reply-To: <CAGXu5jJTSqtOMBNeOGEXfj_1iWGbE7p_YooeHT9wc4WRDjcGyQ@mail.gmail.com>
On 06/13/2014 10:32 AM, Kees Cook wrote:
>>
>> x86-64 can resume from different kernel that did the suspend. kASLR
>> should not be too different from that. (You just include kernel text
>> in the hibernation image. It is small enough to do that.)
>
> Oooh, that's very exciting! How does that work (what happens to the
> kernel that booted first, etc)? I assume physical memory layout can't
> change between hibernation and resume? Or, where should I be reading
> code that does this?
>
"Give me a lever and a place to stand, and I shall move the world."
Reshuffling memory in an arbitrary or near-arbitrary way really isn't
all that hard. The exact data structures you need depends on if you
have any kind of page alignment you can rely on (makes it easier) and
how much spare memory you have (in case of hibernation, there is usually
tons of unused memory as it doesn't make sense to hibernate clean pages.)
-hpa
next prev parent reply other threads:[~2014-06-13 17:37 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-12 19:46 [PATCH 0/2] make kASLR vs hibernation boot-time selectable Kees Cook
2014-06-12 19:46 ` [PATCH 1/2] hibernate: create one-way disable mode Kees Cook
2014-06-12 20:12 ` Rafael J. Wysocki
2014-06-12 19:46 ` [PATCH 2/2] x86, kaslr: boot-time selectable with hibernation Kees Cook
2014-06-12 19:48 ` [PATCH 0/2] make kASLR vs hibernation boot-time selectable H. Peter Anvin
2014-06-12 20:13 ` Rafael J. Wysocki
2014-06-12 20:27 ` Kees Cook
2014-06-12 20:29 ` H. Peter Anvin
2014-06-12 20:58 ` Kees Cook
2014-06-13 10:51 ` Pavel Machek
2014-06-13 17:32 ` Kees Cook
2014-06-13 17:36 ` H. Peter Anvin [this message]
2014-06-13 20:26 ` Pavel Machek
2014-06-13 22:14 ` Rafael J. Wysocki
2014-06-13 22:07 ` Kees Cook
2014-06-13 22:54 ` Rafael J. Wysocki
2014-06-13 22:59 ` Kees Cook
2014-06-14 0:14 ` Rafael J. Wysocki
2014-06-14 0:08 ` Kees Cook
2014-06-14 0:39 ` Rafael J. Wysocki
2014-06-14 7:37 ` Kees Cook
2014-06-15 23:16 ` Rafael J. Wysocki
2014-06-14 16:41 ` H. Peter Anvin
2014-06-15 23:04 ` Rafael J. Wysocki
2014-06-14 2:31 ` H. Peter Anvin
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