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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44D0FC433F5 for ; Sat, 26 Mar 2022 18:41:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232900AbiCZSnO (ORCPT ); Sat, 26 Mar 2022 14:43:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231200AbiCZSnN (ORCPT ); Sat, 26 Mar 2022 14:43:13 -0400 Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [IPv6:2a00:1450:4864:20::129]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D3BA058391 for ; Sat, 26 Mar 2022 11:41:36 -0700 (PDT) Received: by mail-lf1-x129.google.com with SMTP id bu29so18527650lfb.0 for ; Sat, 26 Mar 2022 11:41:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=je98ykY3vsH8qDn25IW7eQYaUsod4iWZw+6FMsszdYQ=; b=cY/i8NkOXIGpbugW/kXT/lHU/6KoHURxtydz8kA95dAKXv2dKSirRf5cna3Zz4aQE+ 3zUrMCb8X6oIozpmPaWm2GuBQkB5p7v5BNoSLeNAqcrF06WOFYpSLhQLT9RJ7kcNoToA /byaS8f5DiCBA3c9IENt3HgD+FLD9/VL6yCSc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=je98ykY3vsH8qDn25IW7eQYaUsod4iWZw+6FMsszdYQ=; b=M9B98QLrACDPgAYHey2jD/vkGMwehuILCgVceDwxIDwz+gtxvy00wAu+jXvUhwP3Mh 05kMS84RSTre2Oc1rslL/oYQscLFxU5ayzsrowKEHhdcziiGOE0kFSBiso5iL43r3yxP G+4onPbIKwYLjiB0NpcAvMeducuEjPKqkvJHyowts6Q+opPQZUjoBw3V8drgLgg7NuOy MAemHIUpGUra4ADgvwHHVfJACy6z72O/1c0X3SbJtuREiUJ3dXMpq/KPVQBovNQtKz5h hY6SCsguuLwNqXICOMNJLoNCkAjOxfcWf6Q/RpEuI8Xw6aym8GxxXHNHm5MqnC3qfckf UDlw== X-Gm-Message-State: AOAM531OSPFnWYr6G5iVTU1ZfrE6FK2/K98eeEGHQc6LxPVEkLloCIp7 T14QvFvYjoOPjXbCy5HVd2aDww9mBSKUycO7k74= X-Google-Smtp-Source: ABdhPJwZwtZoRYrSu6ssxVh+QJg6gXzjajN63E3c3/Y10ePG6aDM/IVb6D7Y7SJId2HMRgQ5z9XgrQ== X-Received: by 2002:a05:6512:1585:b0:445:908b:ad71 with SMTP id bp5-20020a056512158500b00445908bad71mr12554696lfb.200.1648320094834; Sat, 26 Mar 2022 11:41:34 -0700 (PDT) Received: from mail-lf1-f46.google.com (mail-lf1-f46.google.com. [209.85.167.46]) by smtp.gmail.com with ESMTPSA id y23-20020a2e95d7000000b00247e4e386aasm1103771ljh.121.2022.03.26.11.41.33 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 26 Mar 2022 11:41:34 -0700 (PDT) Received: by mail-lf1-f46.google.com with SMTP id t25so18431945lfg.7 for ; Sat, 26 Mar 2022 11:41:33 -0700 (PDT) X-Received: by 2002:a19:e048:0:b0:448:2caa:7ed2 with SMTP id g8-20020a19e048000000b004482caa7ed2mr13185867lfj.449.1648320093080; Sat, 26 Mar 2022 11:41:33 -0700 (PDT) MIME-Version: 1.0 References: <20220325150419.757836392@linuxfoundation.org> <20220325150420.085364078@linuxfoundation.org> In-Reply-To: From: Linus Torvalds Date: Sat, 26 Mar 2022 11:41:17 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 5.10 11/38] swiotlb: rework "fix info leak with DMA_FROM_DEVICE" To: Greg Kroah-Hartman Cc: Linux Kernel Mailing List , stable , Halil Pasic , Christoph Hellwig Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Sat, Mar 26, 2022 at 3:18 AM Greg Kroah-Hartman wrote:" > > Yes, I've been watching that thread. This change is already in 5.15 and > 5.16 kernels, and does solve one known security issue, so it's a tough > call. If you're following that thread, you'll have seen that I've reverted it, and I actually think the security argument was bogus - the whole commit was due to a misunderstanding of the actual direction of the data transfer. But hey, maybe I'm wrong. The only truly uncontested fact is that it broke the ath9k driver. Linus