From patchwork Fri Nov 18 13:32:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 626239 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E587AC433FE for ; Fri, 18 Nov 2022 13:33:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242137AbiKRNdw (ORCPT ); Fri, 18 Nov 2022 08:33:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242089AbiKRNcx (ORCPT ); Fri, 18 Nov 2022 08:32:53 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1758D8E096; Fri, 18 Nov 2022 05:32:52 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A2FD962523; Fri, 18 Nov 2022 13:32:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 544B8C433D6; Fri, 18 Nov 2022 13:32:50 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="ng/ljxGR" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1668778367; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=3Ba13+GXNlXQlY1symDczyowf433BVf2HSRAdnZzlc4=; b=ng/ljxGRlpcuw9DqCA97Oz3sebyeBFvUG8S3UKc3PkFP1PzUXoxGvJRo9kaeKK2JhYdjWm IIgbxvs28YuvF+Nn3POdhmOCZH9LJu3skNDIusTVmq/IC6UBU+bFius9IEkVDTkztbFHh2 GTP3jTX7HfYUb9mkW3YoddC5xzf0r2o= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id b8685e6e (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Fri, 18 Nov 2022 13:32:47 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-efi@vger.kernel.org, linux-crypto@vger.kernel.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org Cc: "Jason A. Donenfeld" Subject: [PATCH v2 0/5] Use EFI variables for random seed Date: Fri, 18 Nov 2022 14:32:34 +0100 Message-Id: <20221118133239.2515648-1-Jason@zx2c4.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org EFI has a rather unique benefit that it has access to some limited non-volatile storage, where the kernel can store a random seed. This series wires that up, with EFISTUB reading the seed and passing it to the kernel, and with the kernel writing a new seed when the RNG is initialized. Patches 1 and 2 are to go through Ard's EFI tree, while patches 3, 4, and 5 are to go through my RNG tree. Jason A. Donenfeld (5): efi: vars: prohibit reading random seed variables efi: stub: use random seed from EFI variable random: add back async readiness notifier vsprintf: initialize siphash key using notifier efi: random: refresh non-volatile random seed when RNG is initialized drivers/char/random.c | 20 +++++++++ drivers/firmware/efi/efi.c | 19 +++++++++ drivers/firmware/efi/libstub/random.c | 59 +++++++++++++++++++++------ fs/efivarfs/inode.c | 4 ++ fs/efivarfs/super.c | 3 ++ include/linux/efi.h | 1 + include/linux/random.h | 1 + lib/vsprintf.c | 14 +++---- 8 files changed, 100 insertions(+), 21 deletions(-) Reviewed-by: Ard Biesheuvel