From patchwork Tue Nov 22 02:03:59 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: 13051807 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 49267C433FE for ; Tue, 22 Nov 2022 02:04:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232035AbiKVCET (ORCPT ); Mon, 21 Nov 2022 21:04:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232359AbiKVCES (ORCPT ); Mon, 21 Nov 2022 21:04:18 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A07C0DEAC8; Mon, 21 Nov 2022 18:04:16 -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 ams.source.kernel.org (Postfix) with ESMTPS id 5D2A9B8136A; Tue, 22 Nov 2022 02:04:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3870EC433C1; Tue, 22 Nov 2022 02:04:13 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="mx625ZE9" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1669082651; 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=OTrT7Oy+UwX6tDTXDcuWMWfrXPh69Y+d/UxvhkUJhAQ=; b=mx625ZE9WhJJXgLhEe74RQYgx+11/NV6nAKPCkZrbjtl8nAz3nnmCVZijkACKdDgP9isRW pBvqNF1MkR2u+m1SCr7OzkjfdsBf6reldCixRUPOM+KNhDiNqQpZOpoZPviIVdsCyYu/3b MphBDiqw4UlMY1Gp7GvTyrh7NaaLK/g= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id ef1f4edb (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Tue, 22 Nov 2022 02:04:10 +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, ardb@kernel.org Cc: "Jason A. Donenfeld" Subject: [PATCH v3 0/5] Use EFI variables for random seed Date: Tue, 22 Nov 2022 03:03:59 +0100 Message-Id: <20221122020404.3476063-1-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 | 22 +++++++++++ drivers/firmware/efi/efi.c | 19 +++++++++ drivers/firmware/efi/libstub/random.c | 55 +++++++++++++++++++++------ fs/efivarfs/inode.c | 4 ++ fs/efivarfs/super.c | 3 ++ include/linux/random.h | 1 + lib/vsprintf.c | 14 +++---- 7 files changed, 97 insertions(+), 21 deletions(-)