linux-kernel - Re: [PATCH v3 2/3] m68k: virt: generate new RNG seed on reboot

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Message-ID: <CAHmME9oTKp=cw9QFHOU6FKT5qSuQufO5Vo+XPELYGoaQK2fPoA@mail.gmail.com>
Date:   Mon, 26 Sep 2022 12:18:25 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] m68k: virt: generate new RNG seed on reboot

On 9/26/22, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> Hi Jason,
>
> On Fri, Sep 23, 2022 at 7:03 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
>> Rather than rebooting into a system with no entropy, regenerate the RNG
>> seed before rebooting, so that the new system has a fresh seed.
>>
>> Fixes: a1ee38ab1a75 ("m68k: virt: Use RNG seed from bootinfo block")
>> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
>
> Thanks for your patch!
>
> I still doubt this is actually guaranteed to work, as the memory containing
> the bootinfo might be overwritten during normal operation.

Thus far, I'm unable to make it *not* work. So this seems like
actually an improvement?

Jason