Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756175AbdDERMu (ORCPT ); Wed, 5 Apr 2017 13:12:50 -0400 Received: from mx1.redhat.com ([209.132.183.28]:15123 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933692AbdDERMc (ORCPT ); Wed, 5 Apr 2017 13:12:32 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com C83ED1C13C2 Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=dhowells@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com C83ED1C13C2 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down From: David Howells To: linux-kernel@vger.kernel.org Cc: gnomes@lxorguk.ukuu.org.uk, linux-efi@vger.kernel.org, Josh Boyer , gregkh@linuxfoundation.org, dhowells@redhat.com, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, matthew.garrett@nebula.com Date: Wed, 05 Apr 2017 18:12:27 +0100 Message-ID: <149141234757.31282.12945475344492398793.stgit@warthog.procyon.org.uk> In-Reply-To: <149141219387.31282.6648284836568938717.stgit@warthog.procyon.org.uk> References: <149141219387.31282.6648284836568938717.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 05 Apr 2017 17:12:32 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 806 Lines: 26 From: Josh Boyer This option allows userspace to pass the RSDP address to the kernel, which makes it possible for a user to circumvent any restrictions imposed on loading modules. Ignore the option when the kernel is locked down. Signed-off-by: Josh Boyer Signed-off-by: David Howells --- drivers/acpi/osl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index db78d353bab1..d4d4ba348451 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -192,7 +192,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void) acpi_physical_address pa = 0; #ifdef CONFIG_KEXEC - if (acpi_rsdp) + if (acpi_rsdp && !kernel_is_locked_down()) return acpi_rsdp; #endif