From xen-announce-bounces@lists.xenproject.org Mon Sep 04 12:51:08 2023 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Mon, 04 Sep 2023 12:51:08 +0000 Received: from list by lists.xenproject.org with outflank-mailman.595156.928684 (Exim 4.92) (envelope-from ) id 1qd91n-0006VF-0m; Mon, 04 Sep 2023 12:50:03 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 595156.928684; Mon, 04 Sep 2023 12:50:02 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qd91m-0006UT-U0; Mon, 04 Sep 2023 12:50:02 +0000 Received: by outflank-mailman (input) for mailman id 595156; Mon, 04 Sep 2023 12:48:58 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qd90k-00052g-AD for xen-announce@lists.xenproject.org; Mon, 04 Sep 2023 12:48:58 +0000 Received: from mail-ej1-x62f.google.com (mail-ej1-x62f.google.com [2a00:1450:4864:20::62f]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 689f4bc1-4b21-11ee-9b0d-b553b5be7939; Mon, 04 Sep 2023 14:48:56 +0200 (CEST) Received: by mail-ej1-x62f.google.com with SMTP id a640c23a62f3a-99c1d03e124so195527166b.2 for ; Mon, 04 Sep 2023 05:48:55 -0700 (PDT) X-BeenThere: xen-announce@lists.xenproject.org List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xenproject.org Precedence: list Sender: "Xen-announce" X-Inumbo-ID: 689f4bc1-4b21-11ee-9b0d-b553b5be7939 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.com; s=cloud; t=1693831735; x=1694436535; darn=lists.xenproject.org; h=to:subject:message-id:date:from:mime-version:from:to:cc:subject :date:message-id:reply-to; bh=P6SuIUeMJ8u02mehYLNuaFrRUsUQroHyAonWStAvrmk=; b=ICcLqZdDZXEdDG3eSmQ/3RwrE0tTvt4tBbjQ3KIcBehoGfb2quNAKIHYRYzTIENLRV BZJ4FScPoWGDHGFVPpFBifgOgwUZX3UbAjrRjQoNPMJ4lCLxDaa9jegXTD9OdhpJQ9Tk AV2OP6Izr5Ezlnc0dYtN+IymAxWh/njBq/Kas= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693831735; x=1694436535; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=P6SuIUeMJ8u02mehYLNuaFrRUsUQroHyAonWStAvrmk=; b=WuCkMoCZ04oZqrr8UST/Lwe8P++qEufWBHHRrDcGI+FkTVunqTfaNdrW0uCB0L8+0P raNCZl2YylhMy763t6DHpi0ISQYIaP6cTCVkvD3uWDbJwZcSSntfRPL8zmhUZPJZ7Q4d QXLWF8vB+OyTtMMHkvx30+04Idrxs8mkTBkllM9MWf3XlfU1G7rbydxgA/454h1CXwXC Gw4rjUbeGslHoJBvoZLJnZoBkQxoO/66f1Kq/QEXo+GkH7krCDaxU4q+3oeY7LXVezfE qVB4qNYtK/UZw8iuYRIdEb+xPbdbmxRV3NMdf2rIwK0JQ0nyaWyqa083UBeiqwNEeFtr quiQ== X-Gm-Message-State: AOJu0YyuTCL8H9HvmmK5xQE0kd5/rHoR8qaSF/kyBp/y0eQrU/vzdNmM BVrWld/SU9rRC6Pm/wneiPsIiPHoY1D/wJIpfgDoQjO+5hNM+/dGfb4= X-Google-Smtp-Source: AGHT+IGOHrE9TCNaLsNNnyUR4UqMIUoxRy4E0ZklR9ivvATHeaKUHt2WrQjcxEFKNU6AiMaatfk3e+92UF+d+q1xwVU= X-Received: by 2002:a17:906:197:b0:99d:dce8:41d6 with SMTP id 23-20020a170906019700b0099ddce841d6mr6417985ejb.71.1693831734906; Mon, 04 Sep 2023 05:48:54 -0700 (PDT) MIME-Version: 1.0 From: Kelly Choi Date: Mon, 4 Sep 2023 13:48:19 +0100 Message-ID: Subject: Documentation survey To: xen-announce@lists.xenproject.org, xen-users@lists.xenproject.org, xen-devel@lists.xenproject.org Content-Type: multipart/alternative; boundary="000000000000de7127060487eeaf" --000000000000de7127060487eeaf Content-Type: text/plain; charset="UTF-8" Hey everyone, Hope you've all had a good weekend! I know that documentation is an important part of The Xen Project, and I have received feedback from a number of users on this topic. Currently, there are some barriers to entry and improvements that can be made. In order to understand further, please could you answer the following survey (~5-10 mins) on your thoughts around the existing documentation. This feedback will help achieve a plan of action. *All responses will be anonymous. * *https://cryptpad.fr/form/#/2/form/view/aIaNqMdkkV85YkQSzM0+ddwMY36XSTf+Vl3k2APoP-U/ * Many thanks, Kelly Choi Open Source Community Manager, XenServer Cloud Software Group --000000000000de7127060487eeaf Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hey everyone,=C2=A0

Hope you've all= had a good weekend!

I know that documentation=C2= =A0is an important part of The Xen Project, and I have received feedback fr= om a number of users on this topic. Currently, there are some barriers to e= ntry and improvements that can be made.=C2=A0

In o= rder to understand further, please could you answer the following survey (~= 5-10 mins) on your thoughts around the existing documentation. This feedbac= k will help achieve a plan of action.

All respo= nses will be anonymous.=C2=A0

Many thanks,
Kelly C= hoi

Open Sou= rce Community Manager, XenServer
Cloud Software Group
--000000000000de7127060487eeaf-- From xen-announce-bounces@lists.xenproject.org Tue Sep 05 12:14:32 2023 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 05 Sep 2023 12:14:32 +0000 Received: from list by lists.xenproject.org with outflank-mailman.595599.929187 (Exim 4.92) (envelope-from ) id 1qdUvr-0005xM-0a; Tue, 05 Sep 2023 12:13:23 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 595599.929187; Tue, 05 Sep 2023 12:13:22 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qdUvq-0005xF-S8; Tue, 05 Sep 2023 12:13:22 +0000 Received: by outflank-mailman (input) for mailman id 595599; Tue, 05 Sep 2023 12:13:21 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qdUvp-0005x3-Fw for xen-announce@lists.xen.org; Tue, 05 Sep 2023 12:13:21 +0000 Received: from mail.xenproject.org (mail.xenproject.org [104.130.215.37]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 98d16999-4be5-11ee-8783-cb3800f73035; Tue, 05 Sep 2023 14:13:19 +0200 (CEST) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qdUve-0007DA-94; Tue, 05 Sep 2023 12:13:10 +0000 Received: from gdunlap by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1qdUve-0000uM-7J; Tue, 05 Sep 2023 12:13:10 +0000 X-BeenThere: xen-announce@lists.xenproject.org List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xenproject.org Precedence: list Sender: "Xen-announce" X-Inumbo-ID: 98d16999-4be5-11ee-8783-cb3800f73035 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Date:Message-Id:Subject:CC:From:To:MIME-Version: Content-Transfer-Encoding:Content-Type; bh=spnz0msETp+VJUNPMgdko2F44ryYPdJkTxl/ALqd22I=; b=hUUGhxXe1YhIr7jC/N3tM3nONv uUsW7mu8npgDg+BzdPw//zoAa8nNmdBVAo3WfI7r6OmoLWnCVgLUXCpppAHFXPpRsw7TfQ7VUSo4I gOKcptnf/88wbjdo35tHgVOFzSwsZ95lpR2Pf0mv9f04ZC11wdBiYrBdXt+TCcCHUKT0=; Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team CC: Xen.org security team Subject: Xen Security Advisory 437 v2 (CVE-2023-34321) - arm32: The cache may not be properly cleaned/invalidated Message-Id: Date: Tue, 05 Sep 2023 12:13:10 +0000 --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2023-34321 / XSA-437 version 2 arm32: The cache may not be properly cleaned/invalidated UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Arm provides multiple helpers to clean & invalidate the cache for a given region. This is, for instance, used when allocating guest memory to ensure any writes (such as the ones during scrubbing) have reached memory before handing over the page to a guest. Unfortunately, the arithmetics in the helpers can overflow and would then result to skip the cache cleaning/invalidation. Therefore there is no guarantee when all the writes will reach the memory. IMPACT ====== A malicious guest may be able to read sensitive data from memory that previously belonged to another guest. VULNERABLE SYSTEMS ================== Systems running all version of Xen are affected. Only systems running Xen on Arm 32-bit are vulnerable. Xen on Arm 64-bit is not affected. MITIGATION ========== There is no known mitigation. CREDITS ======= This issue was discovered by Julien Grall of Amazon. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. Note that patches for released versions are generally prepared to apply to the stable branches, and may not apply cleanly to the most recent release tarball. Downstreams are encouraged to update to the tip of the stable branch before applying these patches. xsa437/xsa437.patch xen-unstable - Xen 4.17.x xsa437/xsa437-4.16.patch Xen 4.16.x - Xen 4.15.x $ sha256sum xsa437* xsa437*/* 259b872275d9d77fc1744df886ffe611d933889bb5ea2833f3c7d8f554eff061 xsa437.meta 31b1a4050403fc83d4ea7619155105001cfd2f739ceb0b0cc7212ab7d0b9d559 xsa437/xsa437.patch ada8ba64e8562ff6016d456e08b7a171ef356cf476c643df9f66b8650009115c xsa437/xsa437-4.16.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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(mail-ed1-x535.google.com [2a00:1450:4864:20::535]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id aab163fb-5151-11ee-9b0d-b553b5be7939; Tue, 12 Sep 2023 11:49:30 +0200 (CEST) Received: by mail-ed1-x535.google.com with SMTP id 4fb4d7f45d1cf-5230a22cfd1so6906222a12.1 for ; Tue, 12 Sep 2023 02:49:29 -0700 (PDT) X-BeenThere: xen-announce@lists.xenproject.org List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xenproject.org Precedence: list Sender: "Xen-announce" X-Inumbo-ID: aab163fb-5151-11ee-9b0d-b553b5be7939 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.com; s=cloud; t=1694512168; x=1695116968; darn=lists.xenproject.org; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :from:to:cc:subject:date:message-id:reply-to; bh=OSkpXD60mkMKp1LVoMvHl+kL8s8XTU2xlXGHwshSDAM=; b=APnStUGlZVHBA6WwjLIRmBRf1TYsKZ+J1CCRcNJtNa/oNFBU5eOIBT3pIqDAJevURv 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AGHT+IF7XzCl2BgjK+0G9+wV4YYA8f6eAw6Q6zFHHNK+tmRPx6gwzLEuyxSlAIxeFIoJLbom4aA3ZWD62c9/cFEPITI= X-Received: by 2002:aa7:d806:0:b0:522:3849:48db with SMTP id v6-20020aa7d806000000b00522384948dbmr9618039edq.3.1694512168579; Tue, 12 Sep 2023 02:49:28 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Kelly Choi Date: Tue, 12 Sep 2023 10:48:53 +0100 Message-ID: Subject: Re: Documentation survey To: xen-announce@lists.xenproject.org, xen-users@lists.xenproject.org, xen-devel@lists.xenproject.org Content-Type: multipart/alternative; boundary="000000000000e045de0605265b50" --000000000000e045de0605265b50 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Good morning all! This is a reminder you have until *Friday 15th September* to fill out the documentation survey below, if you haven't done so already! Many thanks, Kelly Choi Open Source Community Manager, XenServer Cloud Software Group On Mon, Sep 4, 2023 at 1:48=E2=80=AFPM Kelly Choi wr= ote: > Hey everyone, > > Hope you've all had a good weekend! > > I know that documentation is an important part of The Xen Project, and I > have received feedback from a number of users on this topic. Currently, > there are some barriers to entry and improvements that can be made. > > In order to understand further, please could you answer the following > survey (~5-10 mins) on your thoughts around the existing documentation. > This feedback will help achieve a plan of action. > > *All responses will be anonymous. * > > > *https://cryptpad.fr/form/#/2/form/view/aIaNqMdkkV85YkQSzM0+ddwMY36XSTf+V= l3k2APoP-U/ * > > > > Many thanks, > Kelly Choi > > Open Source Community Manager, XenServer > Cloud Software Group > --000000000000e045de0605265b50 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Good morning all!=C2=A0

This is a reminder you have until Friday 15th September to = fill out the documentation survey below, if you haven't done so already= !

Many thanks,
Kelly Choi

Open Source Community Manager, XenS= erver
Cloud Software Group
=


On Mon, Sep 4, 2023 at 1:48=E2=80=AFPM Ke= lly Choi <kelly.choi@cloud.com> wrote:
Hey everyone,=C2=A0

Hope you've all h= ad a good weekend!

I know that documentation=C2=A0= is an important part of The Xen Project, and I have received feedback from = a number of users on this topic. Currently, there are some barriers to entr= y and improvements that can be made.=C2=A0

In orde= r to understand further, please could you answer the following survey (~5-1= 0 mins) on your thoughts around the existing documentation. This feedback w= ill help achieve a plan of action.

All response= s will be anonymous.=C2=A0


=
Many thanks,
Kelly Choi

Open Source Community Manager, XenServer
<= div style=3D"color:rgb(136,136,136)">Cloud Software Group
=
--000000000000e045de0605265b50-- From xen-announce-bounces@lists.xenproject.org Wed Sep 20 09:20:53 2023 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Wed, 20 Sep 2023 09:20:53 +0000 Received: from list by lists.xenproject.org with outflank-mailman.605350.942964 (Exim 4.92) (envelope-from ) id 1qitNg-0004b0-Mq; Wed, 20 Sep 2023 09:20:24 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 605350.942964; Wed, 20 Sep 2023 09:20:24 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qitNg-0004aa-IH; Wed, 20 Sep 2023 09:20:24 +0000 Received: by outflank-mailman (input) for mailman id 605350; Wed, 20 Sep 2023 09:20:23 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qitNf-0004a8-1w for xen-announce@lists.xen.org; Wed, 20 Sep 2023 09:20:23 +0000 Received: from mail.xenproject.org (mail.xenproject.org [104.130.215.37]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id e972de7e-5796-11ee-8789-cb3800f73035; Wed, 20 Sep 2023 11:20:20 +0200 (CEST) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qitNQ-0008Pb-6d; Wed, 20 Sep 2023 09:20:08 +0000 Received: from julieng by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1qitNQ-0001Pu-0K; Wed, 20 Sep 2023 09:20:08 +0000 X-BeenThere: xen-announce@lists.xenproject.org List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xenproject.org Precedence: list Sender: "Xen-announce" X-Inumbo-ID: e972de7e-5796-11ee-8789-cb3800f73035 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Date:Message-Id:Subject:CC:From:To:MIME-Version: Content-Transfer-Encoding:Content-Type; bh=Y8vjJzY/zssAeDoHSd4YfTt60nArCUTnCrO4OkUiR+o=; b=ENmajgd6ocqHz/DTUB5nOHglzv lE1yZzQBmTWlqkhWMe0QFedr02Q+TCd4yJ2pupgM1Viq0LqrbvVlQYn3QxG+gBalKu6zY0eAbU7TM CUAHACWpmjJZch4skVwzh0Jcv6W+kt6uC06kh2GybPpYG8gQXGhHfAf11BW3zeU09joA=; Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team CC: Xen.org security team Subject: Xen Security Advisory 438 v2 (CVE-2023-34322) - top-level shadow reference dropped too early for 64-bit PV guests Message-Id: Date: Wed, 20 Sep 2023 09:20:08 +0000 --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2023-34322 / XSA-438 version 2 top-level shadow reference dropped too early for 64-bit PV guests UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. Since Xen itself needs to be mapped when PV guests run, Xen and shadowed PV guests run directly the respective shadow page tables. For 64-bit PV guests this means running on the shadow of the guest root page table. In the course of dealing with shortage of memory in the shadow pool associated with a domain, shadows of page tables may be torn down. This tearing down may include the shadow root page table that the CPU in question is presently running on. While a precaution exists to supposedly prevent the tearing down of the underlying live page table, the time window covered by that precaution isn't large enough. IMPACT ====== Privilege escalation, Denial of Service (DoS) affecting the entire host, and information leaks all cannot be ruled out. VULNERABLE SYSTEMS ================== All Xen versions from at least 3.2 onwards are vulnerable. Earlier versions have not been inspected. Only x86 systems are vulnerable. Only 64-bit PV guests can leverage the vulnerability, and only when running in shadow mode. Shadow mode would be in use when migrating guests or as a workaround for XSA-273 (L1TF). MITIGATION ========== Running only HVM or PVH guests will avoid the vulnerability. Running PV guests in the PV shim will also avoid the vulnerability. CREDITS ======= This issue was discovered by Tim Deegan, and Jan Beulich of SUSE. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. Note that patches for released versions are generally prepared to apply to the stable branches, and may not apply cleanly to the most recent release tarball. Downstreams are encouraged to update to the tip of the stable branch before applying these patches. xsa438.patch xen-unstable xsa438-4.17.patch Xen 4.17.x xsa438-4.16.patch Xen 4.16.x xsa438-4.15.patch Xen 4.15.x $ sha256sum xsa438* f30067fa3732fb52042b14a2836b610c29af47461425f1a1ccec21cb8a5a48b1 xsa438.patch a2e7d7c12ea19fb95e2d825fda5f7d0124cbb5c4a369cb58ab6036d266b7e297 xsa438-4.15.patch eb75fbeb4aa635d6104c12acd5f7311e477f7c159f2ec4eca8a345327a9aee24 xsa438-4.16.patch f3a305c86124e48b9afa14f3ba76b81d1f5d8d472e2412ae3d014305c749a86a xsa438-4.17.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) 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with esmtp (Exim 4.92) (envelope-from ) id 1qko5m-0004LH-1U for xen-announce@lists.xen.org; Mon, 25 Sep 2023 16:05:50 +0000 Received: from mail.xenproject.org (mail.xenproject.org [104.130.215.37]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 624eabf2-5bbd-11ee-878a-cb3800f73035; Mon, 25 Sep 2023 18:05:47 +0200 (CEST) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qko5Z-0002z9-Od; Mon, 25 Sep 2023 16:05:37 +0000 Received: from andrewcoop by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1qko5Z-0003cF-KD; Mon, 25 Sep 2023 16:05:37 +0000 X-BeenThere: xen-announce@lists.xenproject.org List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xenproject.org Precedence: list Sender: "Xen-announce" X-Inumbo-ID: 624eabf2-5bbd-11ee-878a-cb3800f73035 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Date:Message-Id:Subject:CC:From:To:MIME-Version: Content-Transfer-Encoding:Content-Type; bh=lPmB8qQQXXuq9W/r6/iH+aRzO+9NkrUlusE1Zq/F/90=; b=v3AGhr0xJI5Z01nn0CKPu9Yp+S 96eNghllz9dalMVS1WAZrKpjGWgqjM9aSNDEGe+QMDu9RXQZ/01hVnYkFnUg4+ok2lkxzA7VSJ5R6 QmGVJf6I/Arru2hOcWi9ccFN/n6O3Bv1D7j8SZ4568C5/igjCI1xIqVHFOEtNQetSAbw=; Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team CC: Xen.org security team Subject: Xen Security Advisory 439 v1 (CVE-2023-20588) - x86/AMD: Divide speculative information leak Message-Id: Date: Mon, 25 Sep 2023 16:05:37 +0000 --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2023-20588 / XSA-439 x86/AMD: Divide speculative information leak ISSUE DESCRIPTION ================= In the Zen1 microarchitecure, there is one divider in the pipeline which services uops from both threads. In the case of #DE, the latched result from the previous DIV to execute will be forwarded speculatively. This is a covert channel that allows two threads to communicate without any system calls. In also allows userspace to obtain the result of the most recent DIV instruction executed (even speculatively) in the core, which can be from a higher privilege context. For more information, see: * https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7008.html IMPACT ====== An attacker might be able to infer data from a different execution context on the same CPU core. VULNERABLE SYSTEMS ================== All versions of Xen are vulnerable. Only AMD Zen1 CPUs are believed to be vulnerable. MITIGATION ========== There is no mitigation. RESOLUTION ========== The patches for Xen overwrite the buffer in the divider on the return-to-guest path. However, as with some prior speculative vulnerabilities, the fix is only effective in combination with disabling SMT. For the same reasons as before, Xen does not disable SMT by default. The system administrator is required to risk-assess their workload, and choose whether to enable or disable SMT. Xen will issue a warning if SMT is active and the user has not provided an explicit choice via the smt= command line option. Details of the vulnerability became public before the Xen patches were complete. Hence the patches are already applied to the appropriate trees. They are: Xen-unstable: 1c18d7377453^..b5926c6ecf05 Xen 4.17: d2d2dcae879c^..9ac2f49f5fa3 Xen 4.16: 08539e8315fd^..de751c3d906d Xen 4.15: db3386e6cad6^..d7b78041dc81 -----BEGIN PGP SIGNATURE----- iQFABAEBCAAqFiEEI+MiLBRfRHX6gGCng/4UyVfoK9kFAmURr2UMHHBncEB4ZW4u b3JnAAoJEIP+FMlX6CvZA1QH/RNSR1O6QJjd7z2gSGA9Yka7VWyYOMB2J01AaIl7 69zCRkpqg+baF1aQaAVR0fj39aF7M7xXrd/LSk+E4BBiCRSxxRzbWUGYn9qTLR9w srbpGXqy0aWod9MiwfbTuEzf9uG8XpwOGoRg6p6YBRYE3WrQxIVnYY+KjeeToTEs +UXZ0iZPrjaGaqKnF+PpkX4CMsqHhxk3iJw+ZFX2V4fVNRYgCOpjejmMjbWM4ABr eSsCjTU92/YZvFOsTeIzu74h5yM6SH+XTPW2S8Ve5j3mk7sM8nIiYbIyTMWNCJID HXeodt6eHjhZzV2z7f+/zEngnoITIqz+X3tRcTkHB9+H5jU= =AtsG -----END PGP SIGNATURE----- --=separator-- From xen-announce-bounces@lists.xenproject.org Mon Sep 25 17:19:00 2023 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Mon, 25 Sep 2023 17:19:00 +0000 Received: from list by lists.xenproject.org with outflank-mailman.607981.946268 (Exim 4.92) (envelope-from ) id 1qkpE9-0000fX-EN; Mon, 25 Sep 2023 17:18:33 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 607981.946268; Mon, 25 Sep 2023 17:18:33 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qkpE9-0000fQ-Aq; Mon, 25 Sep 2023 17:18:33 +0000 Received: by outflank-mailman (input) for mailman id 607981; Mon, 25 Sep 2023 17:18:32 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qkpE8-0000do-BI for xen-announce@lists.xen.org; Mon, 25 Sep 2023 17:18:32 +0000 Received: from mail.xenproject.org (mail.xenproject.org [104.130.215.37]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 88238663-5bc7-11ee-9b0d-b553b5be7939; Mon, 25 Sep 2023 19:18:28 +0200 (CEST) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qkpDs-0004vH-06; Mon, 25 Sep 2023 17:18:16 +0000 Received: from andrewcoop by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1qkpDr-0005W1-UI; Mon, 25 Sep 2023 17:18:15 +0000 X-BeenThere: xen-announce@lists.xenproject.org List-Id: "Xen announcements \(low volume\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-announce-bounces@lists.xenproject.org Precedence: list Sender: "Xen-announce" X-Inumbo-ID: 88238663-5bc7-11ee-9b0d-b553b5be7939 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Date:Message-Id:Subject:CC:From:To:MIME-Version: Content-Transfer-Encoding:Content-Type; bh=1SeR4xn+wsNgQw8XgwMb9lXe9y838lCWovJEFN+RunU=; b=oxJl0jPqT1ibAXYpXztu3+sfO+ +Vnlx+Mgz6IB0NtzNPsMWkmHd1s/ePd8uilCSY73JsDYmDJ4MTJV6fv4oNq+AfgHxJsLKXwj7Uun0 spLxfMmtZOJa95Tz0zWY4XifMlQWrH0kIGUh2TauM22i/XZglUrQs+9teUPo1n0eiUN4=; Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team CC: Xen.org security team Subject: Xen Security Advisory 439 v2 (CVE-2023-20588) - x86/AMD: Divide speculative information leak Message-Id: Date: Mon, 25 Sep 2023 17:18:15 +0000 --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2023-20588 / XSA-439 version 2 x86/AMD: Divide speculative information leak UPDATES IN VERSION 2 ==================== Version 1 accidentally linked to the wrong AMD bulletin. This has been corrected in v2. All other information in v1 is believed to be correct. ISSUE DESCRIPTION ================= In the Zen1 microarchitecure, there is one divider in the pipeline which services uops from both threads. In the case of #DE, the latched result from the previous DIV to execute will be forwarded speculatively. This is a covert channel that allows two threads to communicate without any system calls. In also allows userspace to obtain the result of the most recent DIV instruction executed (even speculatively) in the core, which can be from a higher privilege context. For more information, see: * https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7007.html IMPACT ====== An attacker might be able to infer data from a different execution context on the same CPU core. VULNERABLE SYSTEMS ================== All versions of Xen are vulnerable. Only AMD Zen1 CPUs are believed to be vulnerable. MITIGATION ========== There is no mitigation. RESOLUTION ========== The patches for Xen overwrite the buffer in the divider on the return-to-guest path. However, as with some prior speculative vulnerabilities, the fix is only effective in combination with disabling SMT. For the same reasons as before, Xen does not disable SMT by default. The system administrator is required to risk-assess their workload, and choose whether to enable or disable SMT. Xen will issue a warning if SMT is active and the user has not provided an explicit choice via the smt= command line option. Details of the vulnerability became public before the Xen patches were complete. Hence the patches are already applied to the appropriate trees. They are: Xen-unstable: 1c18d7377453^..b5926c6ecf05 Xen 4.17: d2d2dcae879c^..9ac2f49f5fa3 Xen 4.16: 08539e8315fd^..de751c3d906d Xen 4.15: db3386e6cad6^..d7b78041dc81 -----BEGIN PGP SIGNATURE----- iQFABAEBCAAqFiEEI+MiLBRfRHX6gGCng/4UyVfoK9kFAmURwLwMHHBncEB4ZW4u b3JnAAoJEIP+FMlX6CvZMjgIAI+pm7OnUq8EbuD6eyB7yDKBRwm9U7Hu2yrO47f0 CHO/HdMANfx0nCbpKS8+7GXa2gooJXgp3Fo0NGri2G0+hzXNQTsaGnMEMgBV7O0M OXYzao39dhPATP4hi5bm0xPTZ+3zMaP06xvl7JqNqsPK8GFz/cZr/Hsz5r2boZRO 3FXEmbgsG2KTR5+HrSNoeA3LM9aoUqEiIq6oGxLaTr7UI6xK4FL5VFloWhS0r9yp gD7HHP6NlV1Ysxt1xKCxf109HrzWEvih/Gd8hG6eqiHR+i2zyS1hna8Ll/sRFkOO x9FpYHljtb3WKX9bUh4aZXdoAWRW0aR+SWcXToPSk5aFJiE= =W6vz -----END PGP SIGNATURE----- --=separator--