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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 A110ACA9EA0 for ; Fri, 25 Oct 2019 16:52:20 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 5690F21D71 for ; Fri, 25 Oct 2019 16:52:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5690F21D71 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.vnet.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4709Bn5wXwzDqfZ for ; Sat, 26 Oct 2019 03:52:17 +1100 (AEDT) Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4709833mkfzDqdg for ; Sat, 26 Oct 2019 03:49:55 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.vnet.ibm.com Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) by bilbo.ozlabs.org (Postfix) with ESMTP id 47098319Bqz8tG8 for ; Sat, 26 Oct 2019 03:49:55 +1100 (AEDT) Received: by ozlabs.org (Postfix) id 4709830XMgz9sPZ; Sat, 26 Oct 2019 03:49:55 +1100 (AEDT) Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=linux.vnet.ibm.com (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com; envelope-from=nayna@linux.vnet.ibm.com; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.vnet.ibm.com Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 47098240Spz9sPK; Sat, 26 Oct 2019 03:49:54 +1100 (AEDT) Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x9PGgK16075467; Fri, 25 Oct 2019 12:49:41 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 2vv3ck3jxx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 25 Oct 2019 12:49:40 -0400 Received: from m0098413.ppops.net (m0098413.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.27/8.16.0.27) with SMTP id x9PGghME076302; Fri, 25 Oct 2019 12:49:40 -0400 Received: from ppma04dal.us.ibm.com (7a.29.35a9.ip4.static.sl-reverse.com [169.53.41.122]) by mx0b-001b2d01.pphosted.com with ESMTP id 2vv3ck3jxj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 25 Oct 2019 12:49:40 -0400 Received: from pps.filterd (ppma04dal.us.ibm.com [127.0.0.1]) by ppma04dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id x9PGj6nB008403; Fri, 25 Oct 2019 16:49:39 GMT Received: from b01cxnp22035.gho.pok.ibm.com (b01cxnp22035.gho.pok.ibm.com [9.57.198.25]) by ppma04dal.us.ibm.com with ESMTP id 2vqt489u53-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 25 Oct 2019 16:49:39 +0000 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22035.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x9PGncQR51839294 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 25 Oct 2019 16:49:38 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7369DB205F; Fri, 25 Oct 2019 16:49:38 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7C168B2065; Fri, 25 Oct 2019 16:49:37 +0000 (GMT) Received: from [9.85.155.79] (unknown [9.85.155.79]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 25 Oct 2019 16:49:37 +0000 (GMT) Subject: Re: [PATCH v9 1/8] powerpc: detect the secure boot mode of the system To: Lakshmi Ramasubramanian , Nayna Jain , linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org References: <20191024034717.70552-1-nayna@linux.ibm.com> <20191024034717.70552-2-nayna@linux.ibm.com> From: Nayna Jain Message-ID: <569f401a-4327-4295-677f-48037f2582a0@linux.vnet.ibm.com> Date: Fri, 25 Oct 2019 11:49:37 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-10-25_08:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910250154 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ard Biesheuvel , Eric Ricther , Prakhar Srivastava , linux-kernel@vger.kernel.org, Mimi Zohar , Claudio Carvalho , Matthew Garret , Greg Kroah-Hartman , Paul Mackerras , Jeremy Kerr , Elaine Palmer , Oliver O'Halloran , George Wilson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 10/24/19 12:26 PM, Lakshmi Ramasubramanian wrote: > On 10/23/2019 8:47 PM, Nayna Jain wrote: >> This patch defines a function to detect the secure boot state of a >> PowerNV system. > >> +bool is_ppc_secureboot_enabled(void) >> +{ >> +    struct device_node *node; >> +    bool enabled = false; >> + >> +    node = of_find_compatible_node(NULL, NULL, "ibm,secvar-v1"); >> +    if (!of_device_is_available(node)) { >> +        pr_err("Cannot find secure variable node in device tree; >> failing to secure state\n"); >> +        goto out; > > Related to "goto out;" above: > > Would of_find_compatible_node return NULL if the given node is not found? > > If of_device_is_available returns false (say, because node is NULL or > it does not find the specified node) would it be correct to call > of_node_put? of_node_put() handles NULL. Thanks & Regards,      - Nayna