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Re: [PATCH] Prefer kASLR over Hibernation

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On Mon, Apr 11, 2016 at 8:03 PM, Kees Cook <keescook@chromium.org> wrote:
> On Mon, Apr 11, 2016 at 1:00 AM, James Morse <james.morse@arm.com> wrote:
>> On 06/04/16 20:44, Kees Cook wrote:
>>> When building with both CONFIG_HIBERNATION and CONFIG_RANDOMIZE_BASE,
>>> one or the other must be chosen at boot-time. Until now, hibernation
>>> was selected when no choice was made on the command line.
>>>
>>> To make the security benefits of kASLR more widely available to end
>>> users (since the use of hibernation is becoming more rare and kASLR,
>>> already available on x86, will be available on arm64 and MIPS soon),
>>> this changes the default to preferring kASLR over hibernation. Users
>>> wanting hibernation can turn off kASLR by adding "nokaslr" to the kernel
>>> command line.
>>
>> While hibernate isn't yet merged for arm64, it does work with kASLR in v4.6-rc*,
>> it would be a shame to have to choose at boot time, (but that's my problem to
>> fix if/when its merged).
>
> Ah, interesting, so they work together on arm64? (i.e. you've actually
> tested a boot loader that provides the seed for kASLR to operate?)

Probably the PS3 people can provide us with a good tool to generate a
seed that makes hibernation work all the time ;-)

https://xkcd.com/221/

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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[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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