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[209.132.180.67]) by mx.google.com with ESMTP id q4si14862475pfh.157.2019.04.03.17.36.02; Wed, 03 Apr 2019 17:36:17 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=S1y6ny4+; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727015AbfDDAe4 (ORCPT + 99 others); Wed, 3 Apr 2019 20:34:56 -0400 Received: from mail-vk1-f201.google.com ([209.85.221.201]:46945 "EHLO mail-vk1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727011AbfDDAdb (ORCPT ); Wed, 3 Apr 2019 20:33:31 -0400 Received: by mail-vk1-f201.google.com with SMTP id v82so435214vkd.13 for ; Wed, 03 Apr 2019 17:33:30 -0700 (PDT) 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=B6VKNJoBZyOp9UQCoOkYqDvTMA68uU6nV4VivW8ayKY=; b=S1y6ny4+jWv/gWeoO1G3tzhnZv+bXGsPYsaXFnXd9BW0WIzzQVHNEe7Mp+1DhTvAHK t04RZjK7SgpfIcQ1TcyiglrSXM7BLVu/37v1Z/a8Sc4pLE+s5Db8MMk7UKxtmzWktqE/ X8SdZ0h/jX8QLITQGrFaqZ6fF58W542kSDEK3m9lj2nwIuuh06se57HA/kz+meVOIelG LTqKKtWdgYWx9QaE0QaXcQKZhD4t7pX6zz9lWi/Oxf4hYzQMFOLZsdUhhRRuR7npfP/J wSz86q5bCjocH/M3nlOoj8+mOAvkNzpYe8YcGPLNxa3nDue6VGNiU/igoU0QMLovvU6E lwMA== 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=B6VKNJoBZyOp9UQCoOkYqDvTMA68uU6nV4VivW8ayKY=; b=BpPUlcyLeakR/rqNeMX3cSpH4rDtsrHmxIZx3Xdp1IebnjpFOK+AzAenPoacC8aw31 1sp99WuN0EwCCox7pIpjlRAdmHfH8UVL383yr6ClQ2r+HpgCKjATCKoS4MiRXhhkBsIu F+l0+Fq3R6NMf7PrNO22ADa66jpEJYdY822HV/vEKdt+arv0eCXCEwk9WGHAHEiJHp1V 97pSjbpZQG7GEjvEZMl3Rgk7wD4kgPwjoIZxyWloKHeYd6X0/AtB3Ux8kaQTJk8zeaQm prisGtOyc7gnZaoO4tyu2EMNF2l/+yu+/aAFF2fK4KhLysIWT3wPoOthYqPQ2H2ft1nc OqOw== X-Gm-Message-State: APjAAAUClZHF6rwfbLJU6CWyk4D3JukexYdAbLl1X1CD/ppI1rzTwaa6 uQoozoASFugPXMHuO4PgEYOxqdWbb9nuifcj9f5LBA== X-Received: by 2002:a1f:5842:: with SMTP id m63mr366264vkb.15.1554338010216; Wed, 03 Apr 2019 17:33:30 -0700 (PDT) Date: Wed, 3 Apr 2019 17:32:36 -0700 In-Reply-To: <20190404003249.14356-1-matthewgarrett@google.com> Message-Id: <20190404003249.14356-15-matthewgarrett@google.com> Mime-Version: 1.0 References: <20190404003249.14356-1-matthewgarrett@google.com> X-Mailer: git-send-email 2.21.0.392.gf8f6787159e-goog Subject: [PATCH V32 14/27] 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, linux-api@vger.kernel.org, luto@kernel.org, Josh Boyer , Matthew Garrett , Dave Young , linux-acpi@vger.kernel.org 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 Signed-off-by: Matthew Garrett cc: Dave Young cc: linux-acpi@vger.kernel.org --- drivers/acpi/osl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index f29e427d0d1d..cd5bba7b8eb3 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -194,7 +194,8 @@ 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", + LOCKDOWN_INTEGRITY)) return acpi_rsdp; #endif pa = acpi_arch_get_root_pointer(); -- 2.21.0.392.gf8f6787159e-goog