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[83.52.55.163]) by smtp.gmail.com with ESMTPSA id j1sm13601490wrd.50.2021.08.24.00.24.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 24 Aug 2021 00:24:36 -0700 (PDT) Subject: Re: [RFC PATCH v2 0/5] physmem: Have flaview API check bus permission from MemTxAttrs argument To: Alexander Bulekov , Peter Xu References: <20210823164157.751807-1-philmd@redhat.com> <20210823222654.4q5prjmqqnukywem@mozz.bu.edu> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: <91eb2255-a91d-af81-5bc1-ee877d50258c@redhat.com> Date: Tue, 24 Aug 2021 09:24:35 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210823222654.4q5prjmqqnukywem@mozz.bu.edu> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -55 X-Spam_score: -5.6 X-Spam_bar: ----- X-Spam_report: (-5.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.743, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-2.023, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , David Hildenbrand , Jason Wang , Li Qiang , QEMU Developers , Qiuhao Li , qemu-arm , Gerd Hoffmann , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: o27GXEHcJL2z On 8/24/21 12:26 AM, Alexander Bulekov wrote: > On 210823 1650, Peter Xu wrote: >> On Mon, Aug 23, 2021 at 08:10:50PM +0100, Peter Maydell wrote: >>> On Mon, 23 Aug 2021 at 17:42, Philippe Mathieu-Daudé wrote: >>>> >>>> This series aim to kill a recent class of bug, the infamous >>>> "DMA reentrancy" issues found by Alexander while fuzzing. >>>> >>>> Introduce the 'bus_perm' field in MemTxAttrs, defining 3 bits: >>>> >>>> - MEMTXPERM_UNSPECIFIED (current default, unchanged behavior) >>>> - MEMTXPERM_UNRESTRICTED (allow list approach) >>>> - MEMTXPERM_RAM_DEVICE (example of deny list approach) >>>> >>>> If a transaction permission is not allowed (for example access >>>> to non-RAM device), we return the specific MEMTX_BUS_ERROR. >>>> >>>> Permissions are checked in after the flatview is resolved, and >>>> before the access is done, in a new function: flatview_access_allowed(). >>> >>> So I'm not going to say 'no' to this, because we have a real >>> recursive-device-handling problem and I don't have a better >>> idea to hand, but the thing about this is that we end up with >>> behaviour which is not what the real hardware does. I'm not >>> aware of any DMA device which has this kind of "can only DMA >>> to/from RAM, and aborts on access to a device" behaviour... >> >> Sorry for not being familiar with the context - is there more info regarding >> the problem to fix? I'm looking at the links mentioned in the old series: >> >> https://lore.kernel.org/qemu-devel/20200903110831.353476-12-philmd@redhat.com/ >> https://bugs.launchpad.net/qemu/+bug/1886362 >> https://bugs.launchpad.net/qemu/+bug/1888606 >> >> They seem all marked as fixed now. > > Here are some that should still reproduce: > https://gitlab.com/qemu-project/qemu/-/issues/542 > https://gitlab.com/qemu-project/qemu/-/issues/540 > https://gitlab.com/qemu-project/qemu/-/issues/541 > https://gitlab.com/qemu-project/qemu/-/issues/62 > https://lore.kernel.org/qemu-devel/20210218140629.373646-1-ppandit@redhat.com/ (CVE-2021-20255) Also 305, 451, 557. Issues list tracked here: https://gitlab.com/qemu-project/qemu/-/issues/556 (Thanks Alex for updating it!) > > There's also this one, that I don't think I ever created a bug report > for (working on it now): > https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33247 > -Alex > >> >> Thanks, >> >> -- >> Peter Xu >> > 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 X-Spam-Level: X-Spam-Status: No, score=-11.4 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham 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 8D33DC4338F for ; Tue, 24 Aug 2021 07:25:34 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1163F61165 for ; Tue, 24 Aug 2021 07:25:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 1163F61165 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:46352 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mIQoP-0000Oy-60 for qemu-devel@archiver.kernel.org; Tue, 24 Aug 2021 03:25:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59578) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mIQng-0007Zj-8b for qemu-devel@nongnu.org; Tue, 24 Aug 2021 03:24:48 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:26229) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mIQnb-0003pk-7R for qemu-devel@nongnu.org; Tue, 24 Aug 2021 03:24:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1629789881; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wmpWDC7/KlM8wcVIjiS2/9mGUxEKKamLJfbPuuyyaFg=; b=OZuE2mWcr0SG1lLgbMae0MNpHeET1ae0DQWdYP0IadOg+br+eKLu22jpS6rC666BLawLFS zGi5WtYbNPEGnaLtni8tB2r7Cf6wVwz+RBzSr4nJKAedaw/Uf6O9hQ3GXHRw+fcVRl9gFh df13bVCtp0NlvaaTXfjlJXU6Yr/E0Dk= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-410-Lnlz65RlM5KJcvEXW1VFhQ-1; Tue, 24 Aug 2021 03:24:38 -0400 X-MC-Unique: Lnlz65RlM5KJcvEXW1VFhQ-1 Received: by mail-wm1-f71.google.com with SMTP id c4-20020a1c9a04000000b002e864b7edd1so533427wme.6 for ; Tue, 24 Aug 2021 00:24:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=wmpWDC7/KlM8wcVIjiS2/9mGUxEKKamLJfbPuuyyaFg=; b=qktlyLbA2KRNwl0JLz54SDSqAD4hW2QcKb2HLwxeczdpNQZoGu9UuYBt6XHLsHeKZq MfgTJrDfWCLzbD6qJTn1vCKz0EejQMBAYU6j9pE3Juj7uRFuPEgjjkS4q18geS0EbuW+ N9ykG1fJsvd2VUDfLMqMlY6j9UStqreL8m6TE1LR/zoZfmQjAaQeCQkSDwCX5T84Xp5H gb/3WB6ts9gyVmltJ2bmZpmCAwv/t3VEO0VIgVWv+XcQZ4tWi1zxVINRYl+Zs5D0wmPW 2QK5A8DQs5wZuMVXjwzHoGDMPZMHRjxmhdWOlgG5wNegZ2YxuSVve7WMEtBnKs4g6AfB lIcA== X-Gm-Message-State: AOAM5303Kh4Mklf/+xTQoO2rvxcOpUzEvAvH73l4czFIXrN+t64hDWKm nfRuMKpTjAfjZ3K1NSdhqiClbWg58jZHrkt4YkdUP+Edp7+BjVkc/4/3stcahMJ1mmER9mi9yjf 4En7XkxZW5JH71lU= X-Received: by 2002:a5d:6483:: with SMTP id o3mr17740359wri.197.1629789877109; Tue, 24 Aug 2021 00:24:37 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw5tiXKDaBDnk6YJgINDAdJvsqgjJ4rTyAyC4RIKPo2RJ7BzVI/tz77Nmq1syJNWTe5gZmGIA== X-Received: by 2002:a5d:6483:: with SMTP id o3mr17740315wri.197.1629789876792; Tue, 24 Aug 2021 00:24:36 -0700 (PDT) Received: from [192.168.1.36] (163.red-83-52-55.dynamicip.rima-tde.net. [83.52.55.163]) by smtp.gmail.com with ESMTPSA id j1sm13601490wrd.50.2021.08.24.00.24.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 24 Aug 2021 00:24:36 -0700 (PDT) Subject: Re: [RFC PATCH v2 0/5] physmem: Have flaview API check bus permission from MemTxAttrs argument To: Alexander Bulekov , Peter Xu References: <20210823164157.751807-1-philmd@redhat.com> <20210823222654.4q5prjmqqnukywem@mozz.bu.edu> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: <91eb2255-a91d-af81-5bc1-ee877d50258c@redhat.com> Date: Tue, 24 Aug 2021 09:24:35 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210823222654.4q5prjmqqnukywem@mozz.bu.edu> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -55 X-Spam_score: -5.6 X-Spam_bar: ----- X-Spam_report: (-5.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.743, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-2.023, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , David Hildenbrand , Jason Wang , Li Qiang , QEMU Developers , Qiuhao Li , qemu-arm , Gerd Hoffmann , Stefan Hajnoczi , Paolo Bonzini , "Edgar E . Iglesias" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 8/24/21 12:26 AM, Alexander Bulekov wrote: > On 210823 1650, Peter Xu wrote: >> On Mon, Aug 23, 2021 at 08:10:50PM +0100, Peter Maydell wrote: >>> On Mon, 23 Aug 2021 at 17:42, Philippe Mathieu-Daudé wrote: >>>> >>>> This series aim to kill a recent class of bug, the infamous >>>> "DMA reentrancy" issues found by Alexander while fuzzing. >>>> >>>> Introduce the 'bus_perm' field in MemTxAttrs, defining 3 bits: >>>> >>>> - MEMTXPERM_UNSPECIFIED (current default, unchanged behavior) >>>> - MEMTXPERM_UNRESTRICTED (allow list approach) >>>> - MEMTXPERM_RAM_DEVICE (example of deny list approach) >>>> >>>> If a transaction permission is not allowed (for example access >>>> to non-RAM device), we return the specific MEMTX_BUS_ERROR. >>>> >>>> Permissions are checked in after the flatview is resolved, and >>>> before the access is done, in a new function: flatview_access_allowed(). >>> >>> So I'm not going to say 'no' to this, because we have a real >>> recursive-device-handling problem and I don't have a better >>> idea to hand, but the thing about this is that we end up with >>> behaviour which is not what the real hardware does. I'm not >>> aware of any DMA device which has this kind of "can only DMA >>> to/from RAM, and aborts on access to a device" behaviour... >> >> Sorry for not being familiar with the context - is there more info regarding >> the problem to fix? I'm looking at the links mentioned in the old series: >> >> https://lore.kernel.org/qemu-devel/20200903110831.353476-12-philmd@redhat.com/ >> https://bugs.launchpad.net/qemu/+bug/1886362 >> https://bugs.launchpad.net/qemu/+bug/1888606 >> >> They seem all marked as fixed now. > > Here are some that should still reproduce: > https://gitlab.com/qemu-project/qemu/-/issues/542 > https://gitlab.com/qemu-project/qemu/-/issues/540 > https://gitlab.com/qemu-project/qemu/-/issues/541 > https://gitlab.com/qemu-project/qemu/-/issues/62 > https://lore.kernel.org/qemu-devel/20210218140629.373646-1-ppandit@redhat.com/ (CVE-2021-20255) Also 305, 451, 557. Issues list tracked here: https://gitlab.com/qemu-project/qemu/-/issues/556 (Thanks Alex for updating it!) > > There's also this one, that I don't think I ever created a bug report > for (working on it now): > https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33247 > -Alex > >> >> Thanks, >> >> -- >> Peter Xu >> >