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=-16.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL 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 497DFC43381 for ; Thu, 28 Feb 2019 23:12:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 177272133D for ; Thu, 28 Feb 2019 23:12:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ageJCM95" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387908AbfB1XMq (ORCPT ); Thu, 28 Feb 2019 18:12:46 -0500 Received: from mail-qk1-f201.google.com ([209.85.222.201]:39679 "EHLO mail-qk1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733102AbfB1XMo (ORCPT ); Thu, 28 Feb 2019 18:12:44 -0500 Received: by mail-qk1-f201.google.com with SMTP id w134so17297441qka.6 for ; Thu, 28 Feb 2019 15:12:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=Wqh1XdjrR2tvM3s7JD9p7Uz2t1LkZeFbYNWqPw8a2Aw=; b=ageJCM95rFFnT+xvmUfxE0iJAoV+n+N8mVj52V+6FViQT9B9gThHA1Dux7SYXzh757 vW07/zc36SNBzPb7yLPanIUYV4txRFnWY0HPa7vFyNMXwygb4ma3/2VaqKtguwXLB31c y06GyPMa0kjPa0dfBTGkO9WB9kGU17MGsLsGAikRv9+zuPf6l0bwgJteKFBghHOSdTSa Cg1u9+NdHPJs5Dn7cbi8GBKy6ZVzmXduON7YW2/CgSjFUDVFeGCDQGM8IYb5cvXHY2sL Ov+LWR6ufzXIr7NqMCosbz/hUJc8Glr4TF325/gs0oBJI6BvEmgB/3gxy+DCW95Tg4/2 TtUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=Wqh1XdjrR2tvM3s7JD9p7Uz2t1LkZeFbYNWqPw8a2Aw=; b=XYsCrP7jD13AmjcrooiapfRjWdb8D+BkzANTjK3jzPUgZg2/1s2PDgQbRlrmzDPQ2P Ao9Gyv7dgsDbwZ8KdkHEA8nPxR1kLad8YfanDjX3syo37f7FF3LpN2cXiTEWMfHnCt7+ yewc5Rkvl9AJWILOQbP9DwliappFHysVJJLyeUX/i5Bgr9y1prO2O66UIwuCXoL6TkO/ xKZ7jSS33PBUXn0yioILdKKBDHp7gMd9iDKY/dxiag3tNHq5Hw2D0dh1LjqdK/iAOxtS lWO4H+EJgV05niQxczVUhmbnQXfjyR7iduGRk7naAHJJtjQxoOc5HJGwHF1tUUdk+BTQ TliA== X-Gm-Message-State: APjAAAV9BSMLOyqAxPS2tFX3cy1NIFuMp/kFO0QzuoCF8eUKxAlWG6vs xlMCeXi6jNimTtAXs4SAs+9onETpP+KGKlzdOz01ng== X-Google-Smtp-Source: APXvYqzMYtXMIbPpyBJ53LzazIQ0J3J476+ftoTfkkRnqsTBZKh5DwMy7w3f+Yq4e1XEX0j8l3KXmtYFbsoIiTcS9h7BtA== X-Received: by 2002:a0c:869d:: with SMTP id 29mr1097176qvf.34.1551395564025; Thu, 28 Feb 2019 15:12:44 -0800 (PST) Date: Thu, 28 Feb 2019 15:11:51 -0800 In-Reply-To: <20190228231203.212359-1-matthewgarrett@google.com> Message-Id: <20190228231203.212359-15-matthewgarrett@google.com> Mime-Version: 1.0 References: <20190228231203.212359-1-matthewgarrett@google.com> X-Mailer: git-send-email 2.21.0.352.gf09ad66450-goog Subject: [PATCH 15/27] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down From: Matthew Garrett To: jmorris@namei.org Cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, dhowells@redhat.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Josh Boyer This option allows userspace to pass the RSDP address to the kernel, which makes it possible for a user to modify the workings of hardware . Reject the option when the kernel is locked down. Signed-off-by: Josh Boyer Signed-off-by: David Howells Reviewed-by: "Lee, Chun-Yi" cc: Dave Young cc: linux-acpi@vger.kernel.org --- 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 f29e427d0d1d..3e44cef7a0cd 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -194,7 +194,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void) acpi_physical_address pa; #ifdef CONFIG_KEXEC - if (acpi_rsdp) + if (acpi_rsdp && !kernel_is_locked_down("ACPI RSDP specification")) return acpi_rsdp; #endif pa = acpi_arch_get_root_pointer(); -- 2.21.0.352.gf09ad66450-goog