linux-kernel - Re: [PATCH v6 2/7] random, timekeeping: Collect timekeeping entropy in the timekeeping code

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Message-ID: <CALCETrWOxGLG=iUvPD5jGWoS+jHA97N2D1t=Vivmyq3TEJGZvA@mail.gmail.com>
Date:	Thu, 14 Aug 2014 10:34:56 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	kvm list <kvm@...r.kernel.org>, "H. Peter Anvin" <hpa@...or.com>,
	"Theodore Ts'o" <tytso@....edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Andrew Honig <ahonig@...gle.com>,
	Andy Lutomirski <luto@...capital.net>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH v6 2/7] random, timekeeping: Collect timekeeping entropy
 in the timekeeping code

On Wed, Aug 13, 2014 at 10:43 PM, Andy Lutomirski <luto@...capital.net> wrote:
> Currently, init_std_data calls ktime_get_real().  This imposes
> awkward constraints on when init_std_data can be called, and
> init_std_data is unlikely to collect the full unpredictable data
> available to the timekeeping code, especially after resume.
>
> Remove this code from random.c and add the appropriate
> add_device_randomness calls to timekeeping.c instead.

*sigh* this is buggy:


> +       add_device_randomness(tk, sizeof(tk));

sizeof(*tk)

> +       add_device_randomness(tk, sizeof(tk));

ditto.

I'll fix this for v7, but I'll wait awhile for other comments to reduce spam.

--Andy
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