From patchwork Thu May 7 07:19:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Domenico Andreoli X-Patchwork-Id: 212106 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=-3.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=no 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 B91C6C47247 for ; Thu, 7 May 2020 07:24:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9751C20753 for ; Thu, 7 May 2020 07:24:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="vJRo3LGR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725923AbgEGHYp (ORCPT ); Thu, 7 May 2020 03:24:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39088 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725802AbgEGHYo (ORCPT ); Thu, 7 May 2020 03:24:44 -0400 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2AC4EC061A10 for ; Thu, 7 May 2020 00:24:44 -0700 (PDT) Received: by mail-wm1-x334.google.com with SMTP id r26so5522194wmh.0 for ; Thu, 07 May 2020 00:24:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:resent-from:resent-date:resent-message-id:resent-to :message-id:user-agent:date:from:to:cc:subject:references :mime-version:content-disposition; bh=hstys9wIAfhbwE6wNgZrl/SKnLndXvXa9vEadgodDJI=; b=vJRo3LGRbvechV6OSZpluoGx6KWUm+NOAX9HT55rEdbb1AwPe/MwGYd38Yb/0RkqfI UCWDz8NOnlr173gpeF7PNPb9HuEIPIa4sQV9IJA97thYlISVedwJQTK//F/RncWct2Ik BEw54nHElrJjq/soCa2COOpCrhdywesTzmmjhxtNvtz4AI/mYzjwYpszpetKoJH0TLIG xrO8LateSpaKr6pK5hLVleK7i7olgHnlM24/XtUy7Y0paaj56J5970dh9k74314dcakQ K2d/8atpYtqaNGdvIBkkMEqjBMvJObboaQipLnUEavTMK/IWOBVKHTBZbSv8pkJGPzm3 YzHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:resent-from:resent-date:resent-message-id :resent-to:message-id:user-agent:date:from:to:cc:subject:references :mime-version:content-disposition; bh=hstys9wIAfhbwE6wNgZrl/SKnLndXvXa9vEadgodDJI=; b=K7pMxd16i+iIyz9ENoSlVM2AfyHmhF5trC1OOFKZxd7IjAEb6rxqMIlDCZZmEFT0Id T+nuBi489Tr2dnL2f6/ZSQOz90GWMbJeoFUAAu9APvDqmwwv3htKGZviLxX4yjdKfkwy vFkHpW65lDcJ/1uk0JYNQCOV5cUEh6QjNM+kdfBURgnzLHgRbNjw1yfSutHK/huty1Nd f2P89EffyJJTPK9lv+E1FO32KVc8XuDeSn2qNd48mSFbZbbXRWnWJ142TpP6ls1J8Wf5 PvzE0TEH34ajn3Emvz91rtB84CYW3Ak+Lk+To0ubRdEYlLjJXY64JulHYzinRv+4nKun UFnw== X-Gm-Message-State: AGi0PuboqRuYV2wwlWBBNg8cBLo5eco5cbVaOOR7FB8BEYt0VpjYR2LK flcwb1NYEdrSgtE+54lxP8FBMtCxjbY= X-Google-Smtp-Source: APiQypJZAugMgptoQv00zFvd4Ynz+Qdt2ms86GhBFUzAZiXl9w4YAFQ2cZBW5lVo04J8NVmuSdoTpw== X-Received: by 2002:a05:600c:414a:: with SMTP id h10mr2134219wmm.183.1588836282773; Thu, 07 May 2020 00:24:42 -0700 (PDT) Received: from dumbo ([2a0b:f4c2::1]) by smtp.gmail.com with ESMTPSA id p8sm2622039wma.45.2020.05.07.00.24.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 May 2020 00:24:41 -0700 (PDT) Received: from cavok by dumbo with local (Exim 4.92) (envelope-from ) id 1jWatc-0003zy-5Q; Thu, 07 May 2020 09:24:40 +0200 Message-Id: <20200507072357.652675775@linux.com> User-Agent: quilt/0.65 Date: Thu, 07 May 2020 09:19:53 +0200 From: Domenico Andreoli To: "Rafael J. Wysocki" , Pavel Machek Cc: Linux PM , Domenico Andreoli Subject: [PATCH 2/2] hibernate: split snapshot dev option References: <20200507071951.635743820@linux.com> MIME-Version: 1.0 Content-Disposition: inline; filename=hibernate-split-snapshot-dev-option Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Domenico Andreoli Make it possible to reduce the attack surface in case the snapshot device is not to be used from userspace. v2: - the option is enabled by default (it was disabled by default) - remove the premature "DEPRECATED" marking - drop the redefinition of mutual exclusion helpers (in v2 they are owned by hibernte.c) in case the option is deselected - add the help message to the config option Signed-off-by: Domenico Andreoli Cc: "Rafael J. Wysocki" Cc: Pavel Machek Cc: Linux PM --- kernel/power/Kconfig | 12 ++++++++++++ kernel/power/Makefile | 3 ++- 2 files changed, 14 insertions(+), 1 deletion(-) Index: b/kernel/power/Kconfig =================================================================== --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -80,6 +80,18 @@ config HIBERNATION For more information take a look at . +config HIBERNATION_SNAPSHOT_DEV + bool "Userspace snapshot device" + depends on HIBERNATION + default y + ---help--- + Device used by the uswsusp tools. + + Say N if no snapshotting from userspace is needed, this also + reduces the attack surface of the kernel. + + If in doubt, say Y. + config PM_STD_PARTITION string "Default resume partition" depends on HIBERNATION Index: b/kernel/power/Makefile =================================================================== --- a/kernel/power/Makefile +++ b/kernel/power/Makefile @@ -10,7 +10,8 @@ obj-$(CONFIG_VT_CONSOLE_SLEEP) += consol obj-$(CONFIG_FREEZER) += process.o obj-$(CONFIG_SUSPEND) += suspend.o obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o -obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o +obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o +obj-$(CONFIG_HIBERNATION_SNAPSHOT_DEV) += user.o obj-$(CONFIG_PM_AUTOSLEEP) += autosleep.o obj-$(CONFIG_PM_WAKELOCKS) += wakelock.o