Re: [PATCH] Prefer kASLR over Hibernation

From	Ingo Molnar <mingo@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] Prefer kASLR over Hibernation
Date	2016-04-07 02:10 +0200
Message-ID	<rl5Gi-3Ao-7@gated-at.bofh.it> (permalink)
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* Kees Cook <keescook@chromium.org> wrote:

> >> I don't think this is a good idea, as it turns off emergency hibernation of 
> >> laptops - many desktop distros support it by default.
> >
> > Right, I forgot about this one.
> 
> When I last checked Ubuntu doesn't enable hibernation by default any more: 
> https://help.ubuntu.com/16.04/ubuntu-help/power-hibernate.html
> 
> And it seems like Fedora either doesn't either, or has a lot of people
> for whom it doesn't work:
> https://bugzilla.redhat.com/show_bug.cgi?id=1206936
> https://bugzilla.redhat.com/show_bug.cgi?id=1224151
> http://blog.kriptonium.com/2015/12/fedora-23-hibernate.html

Ok, that's a relatively recent development, I distinctly remember my laptop being 
hibernated in such a fashion fairly recently.

That makes it easier to hack around the kASLR incompatibility by making 
hibernation less useful. Personally I think that conceptually user space 
persistency (CRIU et al) is superior to kernel level hibernation - but
user-space save/restore is nowhere near as complete as kernel hibernation,
so it's still somewhat sad that it doesn't work ...

Thanks,

	Ingo

Thread

[PATCH] Prefer kASLR over Hibernation Kees Cook <keescook@chromium.org> - 2016-04-06 21:50 +0200
  Re: [PATCH] Prefer kASLR over Hibernation Pavel Machek <pavel@denx.de> - 2016-04-06 22:20 +0200
    Re: [PATCH] Prefer kASLR over Hibernation Linus Torvalds <torvalds@linux-foundation.org> - 2016-04-06 23:00 +0200
      Re: [PATCH] Prefer kASLR over Hibernation Kees Cook <keescook@chromium.org> - 2016-04-06 23:30 +0200
        Re: [PATCH] Prefer kASLR over Hibernation Ingo Molnar <mingo@kernel.org> - 2016-04-06 23:50 +0200
          Re: [PATCH] Prefer kASLR over Hibernation Ingo Molnar <mingo@kernel.org> - 2016-04-07 00:00 +0200
            Re: [PATCH] Prefer kASLR over Hibernation "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-07 00:40 +0200
              Re: [PATCH] Prefer kASLR over Hibernation Ingo Molnar <mingo@kernel.org> - 2016-04-07 03:00 +0200
  Re: [PATCH] Prefer kASLR over Hibernation "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-06 23:50 +0200
    Re: [PATCH] Prefer kASLR over Hibernation Ingo Molnar <mingo@kernel.org> - 2016-04-07 00:00 +0200
      Re: [PATCH] Prefer kASLR over Hibernation "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-07 00:10 +0200
        Re: [PATCH] Prefer kASLR over Hibernation Kees Cook <keescook@chromium.org> - 2016-04-07 00:20 +0200
          Re: [PATCH] Prefer kASLR over Hibernation Paul Bolle <pebolle@tiscali.nl> - 2016-04-07 00:50 +0200
          Re: [PATCH] Prefer kASLR over Hibernation Ingo Molnar <mingo@kernel.org> - 2016-04-07 02:10 +0200
  Re: [PATCH] Prefer kASLR over Hibernation James Morse <james.morse@arm.com> - 2016-04-11 10:10 +0200
    Re: [PATCH] Prefer kASLR over Hibernation Kees Cook <keescook@chromium.org> - 2016-04-11 20:10 +0200
      Re: [PATCH] Prefer kASLR over Hibernation Geert Uytterhoeven <geert@linux-m68k.org> - 2016-04-11 20:30 +0200
        Re: [PATCH] Prefer kASLR over Hibernation Kees Cook <keescook@chromium.org> - 2016-04-11 20:50 +0200
      Re: [PATCH] Prefer kASLR over Hibernation James Morse <james.morse@arm.com> - 2016-04-12 20:00 +0200

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