From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A852C3A5A1 for ; Thu, 22 Aug 2019 16:05:45 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F23D1206B7 for ; Thu, 22 Aug 2019 16:05:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="emzARnxm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F23D1206B7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=mit.edu Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=MKzZks8xDRnOWRrGykjqoXtyHf/JWF+ZOlmqSQb/j8U=; b=emzARnxmMIyBaS gy/KAQ8QbJLCDa/TuwJzwL0V8vM/3qTSxS+Qq9QcciWvbnrGl0WUJL8O1lSfKh9jv1o/v7wIBhcz2 R3gPRYAXs7IfZJINB03TWa7lP9QJbmdxwvo+uzKYTBEr3Ufu2YF80BYZvl/bBPgA6AHicQnAZM0bj uHjZgCvm6SZTZ+hyMJ9oWexESL0DNT8pow4+ABLoPTQfUjaakOpPLNB2zCP1oqSIBJo/noTJgg0HJ eUTNDa9GOkZcOxS2/nLSfb5cOLtxir/2KwpKumoSk3JrpRU5ZDS67RYRasJpfwmvzcgwwp1PCOSNu KgyJJbyO9x5+JE8GuEvw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i0paq-0001Ne-KA; Thu, 22 Aug 2019 16:05:44 +0000 Received: from outgoing-auth-1.mit.edu ([18.9.28.11] helo=outgoing.mit.edu) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i0paZ-0001CP-JH for linux-arm-kernel@lists.infradead.org; Thu, 22 Aug 2019 16:05:30 +0000 Received: from callcc.thunk.org (guestnat-104-133-0-111.corp.google.com [104.133.0.111] (may be forged)) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id x7MG3r9U010677 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 22 Aug 2019 12:03:55 -0400 Received: by callcc.thunk.org (Postfix, from userid 15806) id CF95A42049E; Thu, 22 Aug 2019 12:03:52 -0400 (EDT) Date: Thu, 22 Aug 2019 12:03:52 -0400 From: "Theodore Y. Ts'o" To: Hsin-Yi Wang Subject: Re: [PATCH v9 2/3] fdt: add support for rng-seed Message-ID: <20190822160352.GA17783@mit.edu> Mail-Followup-To: "Theodore Y. Ts'o" , Hsin-Yi Wang , linux-arm-kernel@lists.infradead.org, Russell King , Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , "Paul E . McKenney" , Kate Stewart , "David S . Miller" , Viresh Kumar , Marek Szyprowski , Arnd Bergmann , Marc Zyngier , Julien Thierry , Greg Kroah-Hartman , Wei Li , Anders Roxell , Rob Herring , Aaro Koskinen , Daniel Thompson , Tim Chen , Rik van Riel , Waiman Long , Marcelo Tosatti , Peter Zijlstra , Armijn Hemel , Grzegorz Halat , Len Brown , Shaokun Zhang , Mike Rapoport , Kees Cook , Stephen Boyd , Guenter Roeck , Andrew Morton , Mathieu Desnoyers , Alexey Dobriyan , Yury Norov , Josh Poimboeuf , Jiri Kosina , Mukesh Ojha , linux-kernel@vger.kernel.org References: <20190822071522.143986-1-hsinyi@chromium.org> <20190822071522.143986-3-hsinyi@chromium.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190822071522.143986-3-hsinyi@chromium.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190822_090528_296012_D77BDACB X-CRM114-Status: GOOD ( 13.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kate Stewart , Peter Zijlstra , Catalin Marinas , Mukesh Ojha , Grzegorz Halat , "H . Peter Anvin" , Guenter Roeck , Will Deacon , Marek Szyprowski , Rob Herring , Daniel Thompson , Anders Roxell , Yury Norov , Marc Zyngier , Russell King , Aaro Koskinen , Ingo Molnar , Viresh Kumar , Waiman Long , "Paul E . McKenney" , Wei Li , Alexey Dobriyan , Julien Thierry , Len Brown , Kees Cook , Arnd Bergmann , Rik van Riel , Stephen Boyd , Shaokun Zhang , Mike Rapoport , Borislav Petkov , Josh Poimboeuf , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Greg Kroah-Hartman , Marcelo Tosatti , linux-kernel@vger.kernel.org, Armijn Hemel , Jiri Kosina , Mathieu Desnoyers , Andrew Morton , Tim Chen , "David S . Miller" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 22, 2019 at 03:15:22PM +0800, Hsin-Yi Wang wrote: > Introducing a chosen node, rng-seed, which is an entropy that can be > passed to kernel called very early to increase initial device > randomness. Bootloader should provide this entropy and the value is > read from /chosen/rng-seed in DT. > > Obtain of_fdt_crc32 for CRC check after early_init_dt_scan_nodes(), > since early_init_dt_scan_chosen() would modify fdt to erase rng-seed. > > Add a new interface add_bootloader_randomness() for rng-seed use case. > Depends on whether the seed is trustworthy, rng seed would be passed to > add_hwgenerator_randomness(). Otherwise it would be passed to > add_device_randomness(). Decision is controlled by kernel config > RANDOM_TRUST_BOOTLOADER. > > Signed-off-by: Hsin-Yi Wang > Reviewed-by: Stephen Boyd > Reviewed-by: Rob Herring For the changes to drivers/char/random.c: Reviewed-by: Theodore Ts'o _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel