linux-kernel - [RESEND] Re: [PATCH] Revert "efi/random: Treat EFI_RNG_PROTOCOL output as bootloader randomness"

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Date:   Wed, 13 Oct 2021 10:30:56 +0300
From:   "Ivan T. Ivanov" <iivanov@...e.de>
To:     Dominik Brodowski <linux@...inikbrodowski.net>
Cc:     Ard Biesheuvel <ardb@...nel.org>, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RESEND] Re: [PATCH] Revert "efi/random: Treat EFI_RNG_PROTOCOL
 output as bootloader randomness"

Hi,

Quoting Dominik Brodowski (2021-10-12 11:40:34)
> Am Tue, Oct 12, 2021 at 11:27:08AM +0300 schrieb Ivan T. Ivanov:
> > This reverts commit 18b915ac6b0ac5ba7ded03156860f60a9f16df2b.
> >
> > When CONFIG_RANDOM_TRUST_BOOTLOADER is enabled add_bootloader_randomness()
> > calls add_hwgenerator_randomness() which might sleep,
> 
> Wouldn't it be better to fix add_bootloader_randomness(), considering 
> that
> calls to that function are likely to happen quite early during kernel
> initialization? Especially as it seems to have worked beforehand?

I have tried. I made wait_event_interruptible() optional, but then
crng_reseed() segfault badly. And I don't think crng_reseed() is
something that I could fix easily. Suggestions are welcomed ;-)

Regards,
Ivan