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Date: Mon, 11 Nov 2013 12:16:12 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Kees Cook <keescook@...omium.org>, Ingo Molnar <mingo@...nel.org>
CC: LKML <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...ux.intel.com>,
"linux-tip-commits@...r.kernel.org"
<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/kaslr] x86, kaslr: Provide randomness functions
XOR and rotate is probably a good start.
Kees Cook <keescook@...omium.org> wrote:
>On Mon, Nov 11, 2013 at 12:07 PM, Ingo Molnar <mingo@...nel.org> wrote:
>>
>> * H. Peter Anvin <hpa@...or.com> wrote:
>>
>>> Of course, perhaps we could just hash struct boot_params as a
>starting
>>> point?
>>
>> Yeah, that would be a good first step, before trying to parse DMI or
>ACPI.
>> Anything that is reasonably system dependent and gives at least some
>> amount of unpredicability.
>
>Given the very limited nature of the early boot environment, what
>would you recommend for the hashing routine itself? There's nothing in
>boot/ that does any kind of "real" crypto hashing. Should I just XOR
>the entire contents of boot_params together?
>
>-Kees
--
Sent from my mobile phone. Please pardon brevity and lack of formatting.
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