From: Matthew Garrett <mjg59@srcf.ucam.org>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: linux-efi@vger.kernel.org, linux-crypto@vger.kernel.org,
patches@lists.linux.dev, linux-kernel@vger.kernel.org,
ardb@kernel.org
Subject: Re: [PATCH v3 2/5] efi: stub: use random seed from EFI variable
Date: Sun, 27 Nov 2022 21:12:44 +0000 [thread overview]
Message-ID: <20221127211244.GB32253@srcf.ucam.org> (raw)
In-Reply-To: <20221122020404.3476063-3-Jason@zx2c4.com>
On Tue, Nov 22, 2022 at 03:04:01AM +0100, Jason A. Donenfeld wrote:
> + * We delete the seed here, and /hope/ that this causes EFI to
> + * also zero out its representation on disk. This is somewhat
Several implementations I've worked with simply append a deletion marker
or append a new variable value until the variable store fills up
entirely, at which point a garbage collection event is either run or
scheduled for the next reboot. The spec doesn't define how this is
handled so unfortunately I don't think there's any way to get a pony
here.
next prev parent reply other threads:[~2022-11-27 21:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-22 2:03 [PATCH v3 0/5] Use EFI variables for random seed Jason A. Donenfeld
2022-11-22 2:04 ` [PATCH v3 1/5] efi: vars: prohibit reading random seed variables Jason A. Donenfeld
2022-11-27 21:00 ` Matthew Garrett
2022-11-28 1:10 ` Jason A. Donenfeld
2022-11-22 2:04 ` [PATCH v3 2/5] efi: stub: use random seed from EFI variable Jason A. Donenfeld
2022-11-27 21:12 ` Matthew Garrett [this message]
2022-11-28 1:12 ` Jason A. Donenfeld
2022-11-28 1:35 ` Matthew Garrett
2022-11-22 2:04 ` [PATCH v3 3/5] random: add back async readiness notifier Jason A. Donenfeld
2022-11-22 2:04 ` [PATCH v3 4/5] vsprintf: initialize siphash key using notifier Jason A. Donenfeld
2022-11-22 2:04 ` [PATCH v3 5/5] efi: random: refresh non-volatile random seed when RNG is initialized Jason A. Donenfeld
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