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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D749C433EF for ; Wed, 18 May 2022 12:27:14 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B54F06B0072; Wed, 18 May 2022 08:27:13 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B03976B0073; Wed, 18 May 2022 08:27:13 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9CBD56B0074; Wed, 18 May 2022 08:27:13 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 8B4F26B0072 for ; Wed, 18 May 2022 08:27:13 -0400 (EDT) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 62B6E517 for ; Wed, 18 May 2022 12:27:13 +0000 (UTC) X-FDA: 79478788746.22.5C89A9D Received: from vps0.lunn.ch (vps0.lunn.ch [185.16.172.187]) by imf12.hostedemail.com (Postfix) with ESMTP id D8D4F400BC for ; Wed, 18 May 2022 12:26:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Disposition:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:From:Sender:Reply-To:Subject: Date:Message-ID:To:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Content-Disposition:In-Reply-To:References; bh=QJsVQym+xL0e9ZE8cs4o3sRq3C2RnAjl/FhXvupRFQ0=; b=D/Bh+Gmzw2BN6pBNp567gS2D0/ VKxeDUt7MYxt68TtoX3genmgLQ2oeiNNKiP0kGjaIGmiJfJjrDvbEDObjF99Cs6dMhZ6RnHqXVH7+ ssMEbATCPWp8/NOivDUP4Rv4NAL42rgZGvDejwV1CjptmTPve2x2GjNuMuzzwvPD0tOg=; Received: from andrew by vps0.lunn.ch with local (Exim 4.94.2) (envelope-from ) id 1nrIld-003K4e-Dv; Wed, 18 May 2022 14:27:05 +0200 Date: Wed, 18 May 2022 14:27:05 +0200 From: Andrew Lunn To: Vivek Kumar Cc: corbet@lwn.net, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, maz@kernel.org, axboe@kernel.dk, rafael@kernel.org, akpm@linux-foundation.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-pm@vger.kernel.org, linux-mm@kvack.org, len.brown@intel.com, pavel@ucw.cz, paulmck@kernel.org, bp@suse.de, keescook@chromium.org, songmuchun@bytedance.com, rdunlap@infradead.org, damien.lemoal@opensource.wdc.com, pasha.tatashin@soleen.com, tabba@google.com, ardb@kernel.org, tsoni@quicinc.com, quic_psodagud@quicinc.com, quic_svaddagi@quicinc.com, Prasanna Kumar Subject: Re: [RFC 4/6] mm: swap: Add randomization check for swapon/off calls Message-ID: References: <1652860121-24092-1-git-send-email-quic_vivekuma@quicinc.com> <1652860121-24092-5-git-send-email-quic_vivekuma@quicinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1652860121-24092-5-git-send-email-quic_vivekuma@quicinc.com> Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=lunn.ch header.s=20171124 header.b="D/Bh+Gmz"; dmarc=none; spf=pass (imf12.hostedemail.com: domain of andrew@lunn.ch designates 185.16.172.187 as permitted sender) smtp.mailfrom=andrew@lunn.ch X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D8D4F400BC X-Rspam-User: X-Stat-Signature: 8uo3ippb66bnahdey3rfpgkzjtgns3r7 X-HE-Tag: 1652876803-491685 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, May 18, 2022 at 01:18:39PM +0530, Vivek Kumar wrote: > Add addtional check on swapon/swapoff sycalls to disable > randomization of swap offsets if GENHD_FL_NO_RANDOMIZE > flag is passed. Is there already a flag in the image header which tells you if the image is randomozied or not? I assume the bootloader needs to know, doing a linear read of a randomized image is not going to end well. Andrew