From patchwork Wed Jul 31 22:15:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Garrett X-Patchwork-Id: 11069697 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 59BB113AC for ; Wed, 31 Jul 2019 22:19:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4AB8227F17 for ; Wed, 31 Jul 2019 22:19:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3ED6827F81; Wed, 31 Jul 2019 22:19:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2819E27F3E for ; Wed, 31 Jul 2019 22:19:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731248AbfGaWQx (ORCPT ); Wed, 31 Jul 2019 18:16:53 -0400 Received: from mail-pg1-f202.google.com ([209.85.215.202]:52712 "EHLO mail-pg1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731242AbfGaWQw (ORCPT ); Wed, 31 Jul 2019 18:16:52 -0400 Received: by mail-pg1-f202.google.com with SMTP id h3so43743596pgc.19 for ; Wed, 31 Jul 2019 15:16:52 -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=mRx6DvobeAgz9fXiYoI+VAmx830kBHXoGc7G6A5EVd0=; b=IXsxtFi3dTqKB+o/Wp7s083XS7SjUbQMcCgIsd0WIzzMtZmNaSQKck9SZk8/LV/tKW iauqc9Sh1AIluynW7+PR4PhpczN6yRdIv953ynjwuwFWHa/UVnQ72sULwrXjNjS6e/rU 9B58SiL1PCO7x+gwtiCfLRDcFLfHYqJckXhIxs7f7BmC/OAWPsSihkTtRDo4hMCslWC4 DcbbsuYXQYGwOfMS+1sE0Xp813o+0VO5tuwgaPAWsIiBTlDFJ2yTuhzH/viPVcMxtFXv PCDiNz31TQAFo2c/g5gz4FxUjGG5qNoYLTvZVJc1/xMrVhVCF6vii+6Ml1XW+QkFPzAs w83w== 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=mRx6DvobeAgz9fXiYoI+VAmx830kBHXoGc7G6A5EVd0=; b=Yc+c3gz/BT8FDQLzUuc/m0m4JH9KyLdkbBxH9rh8zyY0ECfu9tV0NNs1ieCV1GQ/EX oArYLdc17ZKda3cmapAhrccWgnqTgOBY7uOwltZ5DQrhv3UMXT+l0CL6nB9kMsLkKDZ0 B5YrSoyxucz3AvdK2skxSZlQzVJwSq91Lr1t0I5EDyP6hfgFMa99PWfbuXroNQyJdh72 EL8I7Fy9VMsyjkt89RBRRnLsEpibYgtLihKZxJzJw6YznYDHnnwXwURbVSEuPCQlwGlv OxyTaZ7Ic5qU9C7ZRRLFxlY5SkEEEtDbu3Kv7fHB3MjHia+9X7L1zcz/fRdtLM8ofmkF dqKw== X-Gm-Message-State: APjAAAW9ZzadGq3kRAH1qZ84AtlT0o8KPoG4gzc+0l17pKlZNhfUT+Z2 kobkbDaTHG1JduYi8e0r5xiNrMYbL748+oA/JbqdVw== X-Google-Smtp-Source: APXvYqwPUST8bcWEuK6wPg2C/0aVphd5/eFEPuRhKx/A1xJZobcujQxWD9xlWlFEjxq639LtyRci3WWJHAF+9qOzVRDrpA== X-Received: by 2002:a65:44cc:: with SMTP id g12mr37784362pgs.409.1564611411719; Wed, 31 Jul 2019 15:16:51 -0700 (PDT) Date: Wed, 31 Jul 2019 15:15:58 -0700 In-Reply-To: <20190731221617.234725-1-matthewgarrett@google.com> Message-Id: <20190731221617.234725-11-matthewgarrett@google.com> Mime-Version: 1.0 References: <20190731221617.234725-1-matthewgarrett@google.com> X-Mailer: git-send-email 2.22.0.770.g0f2c4a37fd-goog Subject: [PATCH V37 10/29] hibernate: Disable when the kernel is locked down From: Matthew Garrett To: jmorris@namei.org Cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Josh Boyer , David Howells , Matthew Garrett , Kees Cook , rjw@rjwysocki.net, pavel@ucw.cz, linux-pm@vger.kernel.org Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Josh Boyer There is currently no way to verify the resume image when returning from hibernate. This might compromise the signed modules trust model, so until we can work with signed hibernate images we disable it when the kernel is locked down. Signed-off-by: Josh Boyer Signed-off-by: David Howells Signed-off-by: Matthew Garrett Reviewed-by: Kees Cook Cc: rjw@rjwysocki.net Cc: pavel@ucw.cz cc: linux-pm@vger.kernel.org --- include/linux/security.h | 1 + kernel/power/hibernate.c | 3 ++- security/lockdown/lockdown.c | 1 + 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/include/linux/security.h b/include/linux/security.h index 69c5de539e9a..304a155a5628 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -106,6 +106,7 @@ enum lockdown_reason { LOCKDOWN_MODULE_SIGNATURE, LOCKDOWN_DEV_MEM, LOCKDOWN_KEXEC, + LOCKDOWN_HIBERNATION, LOCKDOWN_INTEGRITY_MAX, LOCKDOWN_CONFIDENTIALITY_MAX, }; diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index cd7434e6000d..3c0a5a8170b0 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include "power.h" @@ -68,7 +69,7 @@ static const struct platform_hibernation_ops *hibernation_ops; bool hibernation_available(void) { - return (nohibernate == 0); + return nohibernate == 0 && !security_locked_down(LOCKDOWN_HIBERNATION); } /** diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c index 6f302c156bc8..a0996f75629f 100644 --- a/security/lockdown/lockdown.c +++ b/security/lockdown/lockdown.c @@ -21,6 +21,7 @@ static char *lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1] = { [LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading", [LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port", [LOCKDOWN_KEXEC] = "kexec of unsigned images", + [LOCKDOWN_HIBERNATION] = "hibernation", [LOCKDOWN_INTEGRITY_MAX] = "integrity", [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality", };