From patchwork Mon Mar 18 21:32:31 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Garrett X-Patchwork-Id: 2296131 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 1DF1F3FCF6 for ; Mon, 18 Mar 2013 21:34:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756886Ab3CRVdV (ORCPT ); Mon, 18 Mar 2013 17:33:21 -0400 Received: from cavan.codon.org.uk ([93.93.128.6]:35952 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933390Ab3CRVdB (ORCPT ); Mon, 18 Mar 2013 17:33:01 -0400 Received: from [2001:470:1f07:1371:e0f4:3a1:9c35:d688] (helo=x230.mview.int.nebula.com) by cavan.codon.org.uk with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.72) (envelope-from ) id 1UHhfw-0006Ez-4C; Mon, 18 Mar 2013 21:33:00 +0000 From: Matthew Garrett To: linux-kernel@vger.kernel.org Cc: linux-security-module@vger.kernel.org, linux-efi@vger.kernel.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, Josh Boyer Subject: [PATCH 10/12] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment Date: Mon, 18 Mar 2013 17:32:31 -0400 Message-Id: <1363642353-30749-10-git-send-email-matthew.garrett@nebula.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1363642353-30749-1-git-send-email-matthew.garrett@nebula.com> References: <1363642353-30749-1-git-send-email-matthew.garrett@nebula.com> X-SA-Do-Not-Run: Yes X-SA-Exim-Connect-IP: 2001:470:1f07:1371:e0f4:3a1:9c35:d688 X-SA-Exim-Mail-From: matthew.garrett@nebula.com X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Josh Boyer This option allows userspace to pass the RSDP address to the kernel. This could potentially be used to circumvent the secure boot trust model. We ignore the setting if we don't have the CAP_COMPROMISE_KERNEL capability. Signed-off-by: Josh Boyer --- 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 586e7e9..0ef63f1 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -245,7 +245,7 @@ early_param("acpi_rsdp", setup_acpi_rsdp); acpi_physical_address __init acpi_os_get_root_pointer(void) { #ifdef CONFIG_KEXEC - if (acpi_rsdp) + if (acpi_rsdp && capable(CAP_COMPROMISE_KERNEL)) return acpi_rsdp; #endif