From xen-announce-bounces@lists.xenproject.org Tue Oct 20 12:01:10 2020 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 20 Oct 2020 12:01:10 +0000 Received: from list by lists.xenproject.org with outflank-mailman.9115.24508 (Exim 4.92) (envelope-from ) id 1kUqJy-0006IL-FO; Tue, 20 Oct 2020 12:00:54 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 9115.24508; Tue, 20 Oct 2020 12:00:54 +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" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJy-0006ID-At; Tue, 20 Oct 2020 12:00:54 +0000 Received: by outflank-mailman (input) for mailman id 9115; Tue, 20 Oct 2020 12:00:53 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJx-0006Dt-CT for xen-announce@lists.xen.org; Tue, 20 Oct 2020 12:00:53 +0000 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 5c73edf6-5685-4d42-b9de-7a9fef054c5e; Tue, 20 Oct 2020 12:00:40 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJZ-0001JQ-UX; Tue, 20 Oct 2020 12:00:29 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1kUqJZ-0001xT-Qb; Tue, 20 Oct 2020 12:00:29 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJx-0006Dt-CT for xen-announce@lists.xen.org; Tue, 20 Oct 2020 12:00:53 +0000 X-Inumbo-ID: 5c73edf6-5685-4d42-b9de-7a9fef054c5e Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 5c73edf6-5685-4d42-b9de-7a9fef054c5e; Tue, 20 Oct 2020 12:00:40 +0000 (UTC) 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=RiwhqTEH0E0roI1zI7wWAXFmOGUyLlkz1tsekO2T5EU=; b=diov/HDtqI9d2lsgEohuxN9y4N ijG5fkcNT1HixB2fyPttj+0XpMf1vgNTFGrzLEjv7Hl38WEX+lmbmiEyPM9H5fl/jV93V45J7e4xn KEVbwiEvg+fTt9JlJL3SkndUFGGc1FLUXv9CLaKjTtoGs+vDvuUKFLuk1WBbs7Jd0G2E=; Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJZ-0001JQ-UX; Tue, 20 Oct 2020 12:00:29 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1kUqJZ-0001xT-Qb; Tue, 20 Oct 2020 12:00:29 +0000 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 286 v4 - x86 PV guest INVLPG-like flushes may leave stale TLB entries Message-Id: Date: Tue, 20 Oct 2020 12:00:29 +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 XSA-286 version 4 x86 PV guest INVLPG-like flushes may leave stale TLB entries UPDATES IN VERSION 4 ==================== Warn about performance impact. Public release. ISSUE DESCRIPTION ================= x86 PV guest kernels may use hypercalls with INVLPG-like behavior to invalidate TLB entries even after changes to non-leaf page tables. Such changes to non-leaf page tables will, however, also render stale possible TLB entries created by Xen's internal use of linear page tables to process guest requests like update-va-mapping. Invalidation of these TLB entries has been missing, allowing subsequent guest requests to change address mappings for one process to potentially modify memory meanwhile in use elsewhere. IMPACT ====== Malicious x86 PV guest user mode may be able to escalate their privilege to that of the guest kernel. VULNERABLE SYSTEMS ================== All versions of Xen expose the vulnerability. The vulnerability is exposed to x86 PV guests only. x86 HVM/PVH guests as well as ARM ones are not vulnerable. MITIGATION ========== There is no known mitigation. CREDITS ======= This issue was discovered by Jann Horn of Google Project Zero. RESOLUTION ========== Applying the appropriate set of attached patches resolves this issue. Note that these patches are known to produce serious performence problems for at least some workloads. Work is ongoing to improve the performance, and this XSA will be updated when new patches are available. xsa286/*.patch xen-unstable xsa286-4.14/*.patch Xen 4.14.x xsa286-4.13/*.patch Xen 4.13.x xsa286-4.12/*.patch Xen 4.12.x xsa286-4.11/*.patch Xen 4.11.x xsa286-4.10/*.patch Xen 4.10.x $ sha256sum xsa286* xsa286*/* e67a0828be2157c54282a4cc6956234581d32b793021e12ee61676bad4d3b740 xsa286.meta 95c1650a7e0496577929fd5d3240b14ab69e4086b613a52117fcfd879c9aea0d xsa286-4.10/0001-x86-shadow-drop-further-32-bit-relics.patch 18218556f8f9218a57dc9afeffddeaa2133fbe2788871082d8b040ab67abb68c xsa286-4.10/0002-x86-shadow-don-t-pass-wrong-L4-MFN-to-guest_walk_tab.patch e8c89338a74b5fce9ee2c82e360889123afd7efe72536c236cf521c28e48ecc9 xsa286-4.10/0003-x86-shadow-don-t-use-map_domain_page_global-on-paths.patch a677ddb308359450087c21085536d64a15d9339cd02a88eecd8d694c9d26837c xsa286-4.10/0004-x86-don-t-allow-clearing-of-TF_kernel_mode-for-other.patch 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6e4023e7d366e53ccda8f80a4b36bd77f194b84ef0a30d1af6f18d56c11c5256 xsa286-4.11/0002-x86-mm-split-L4-and-L3-parts-of-the-walk-out-of-do_p.patch aabccc3a6c267e41c3ac47916592ce645f6e6788cad900845dbf254801f9dd23 xsa286-4.11/0003-x86-mm-check-page-types-in-do_page_walk.patch 9bbc53a6533209f85edb005e8a517d5a80fda9db8af39b9378eba74857b9fa6b xsa286-4.11/0004-x86-mm-avoid-using-linear-page-tables-in-map_guest_l.patch 19f09374a4d3383eb1e5b9f0b465ff33e17f71fe7131e6cd61599ac9f79e8b00 xsa286-4.11/0005-x86-mm-avoid-using-linear-page-tables-in-guest_get_e.patch 7b17dd013bdd9520a7c0cec2a6b56da677d980b982b6869865c99f374b3c1560 xsa286-4.11/0006-x86-mm-avoid-using-top-level-linear-page-tables-in-u.patch c4c52a34efd14745a0a80f15a73daf7d7e72cfdf2925045a5ec1d22c798baaf2 xsa286-4.11/0007-x86-mm-restrict-use-of-linear-page-tables-to-shadow-.patch e831e18b528d845e3aef329df98244ebed1ade0388f1bfb083d8de626e148388 xsa286-4.12/0001-x86-don-t-allow-clearing-of-TF_kernel_mode-for-other.patch 9db102623f51bb5757fff3a2364a675893ca52e09f47868dad15ce1cb44c40a8 xsa286-4.12/0002-x86-mm-split-L4-and-L3-parts-of-the-walk-out-of-do_p.patch 3b0768c05123681db5256a96af3a8abe18e0a488b767183be728cb0a06969333 xsa286-4.12/0003-x86-mm-check-page-types-in-do_page_walk.patch 30342a0c11e0a48b50cd461b6388dce8640f6380cde1d738a3ddd8b95a8c7b1b xsa286-4.12/0004-x86-mm-avoid-using-linear-page-tables-in-map_guest_l.patch 3c1a687243e2df7b64a49279cd99ceabdcc00d9f48476faacd8915a9cc61e775 xsa286-4.12/0005-x86-mm-avoid-using-linear-page-tables-in-guest_get_e.patch c5aacc47b696b74e80e368c25f0deba20aa69e1de6823f334fddd6a40c6f6a22 xsa286-4.12/0006-x86-mm-avoid-using-top-level-linear-page-tables-in-u.patch 07e3f5bcbfbdec070e28fc1bd727b0eb7adc2a75c26636e081800e9939c9bcc2 xsa286-4.12/0007-x86-mm-restrict-use-of-linear-page-tables-to-shadow-.patch 089d284b29b7179b5c9c04beaf90f24b4b79d81eb3bf55b607405755f3f8b6d8 xsa286-4.13/0001-x86-mm-split-L4-and-L3-parts-of-the-walk-out-of-do_p.patch 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fd11aaacef7fd090fbc6409069b57d76a06a7e835b9a9eb5de8e15ace3ffb3e5 xsa286/0004-x86-mm-avoid-using-linear-page-tables-in-guest_get_e.patch dbfce6e2975d191b6568392593a835b5fc87d3869a5fad1917aecc11d1f2a62a xsa286/0005-x86-mm-avoid-using-top-level-linear-page-tables-in-u.patch 5ad8a48a603b3fd195168d62d481516999422f86e5bbc65b01cde1ff1d262fb2 xsa286/0006-x86-mm-restrict-use-of-linear-page-tables-to-shadow-.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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+0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJd-0001Ja-4u; Tue, 20 Oct 2020 12:00:33 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1kUqJd-0001yN-2q; Tue, 20 Oct 2020 12:00:33 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJp-0006DX-JM for xen-announce@lists.xen.org; Tue, 20 Oct 2020 12:00:45 +0000 X-Inumbo-ID: ce2b6d7c-38b0-4162-8c70-60e68f1fdc40 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id ce2b6d7c-38b0-4162-8c70-60e68f1fdc40; Tue, 20 Oct 2020 12:00:39 +0000 (UTC) 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=03oVv59KE3qloTC2GXz56bxSgfUd293N6vDaNG5POWU=; b=o6i1k7+agkIQZkUtyHYq0MCw6h iU+AFyvv2kkB98w2zRrth1GHZxmu0iPDVoA6k80fqClcFGW9lMlkdA7jQrWmPdfkJuSPrrPeUR0HE Ar18jKm1AQmTyW3I13olHndppo2xJHmDuT7US0hHPHhDrh+myV1kx09qXe2sx7U3v0Ng=; Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJd-0001Ja-4u; Tue, 20 Oct 2020 12:00:33 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1kUqJd-0001yN-2q; Tue, 20 Oct 2020 12:00:33 +0000 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 331 v2 - Race condition in Linux event handler may crash dom0 Message-Id: Date: Tue, 20 Oct 2020 12:00:33 +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 XSA-331 version 2 Race condition in Linux event handler may crash dom0 UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= The Linux kernel event channel handling code doesn't defend the handling of an event against the same event channel being removed in parallel. This can result in accesses to already freed memory areas or NULL pointer dereferences in the event handling code, leading to misbehaviour of the system or even crashes. IMPACT ====== A misbehaving guest can trigger a dom0 crash by sending events for a paravirtualized device while simultaneously reconfiguring it. VULNERABLE SYSTEMS ================== All systems with a Linux dom0 are vulnerable. All Linux kernel versions are vulnerable. MITIGATION ========== There is no known mitigation. CREDITS ======= This issue was discovered by Jinoh Kang of Theori. 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. xsa331-linux.patch Linux $ sha256sum xsa331* 8583392c0c573f7baa85e41c9afbdf74dcb04aea1be992d78991f0787230a193 xsa331-linux.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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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" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqKG-0006hK-CU; Tue, 20 Oct 2020 12:01:12 +0000 Received: by outflank-mailman (input) for mailman id 9127; Tue, 20 Oct 2020 12:01:10 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqKE-0006DX-KW for xen-announce@lists.xen.org; Tue, 20 Oct 2020 12:01:10 +0000 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 606dbaa2-065d-4b85-8699-989412608bdc; Tue, 20 Oct 2020 12:00:51 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJo-0001KQ-1l; Tue, 20 Oct 2020 12:00:44 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1kUqJo-00021v-0d; Tue, 20 Oct 2020 12:00:44 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqKE-0006DX-KW for xen-announce@lists.xen.org; Tue, 20 Oct 2020 12:01:10 +0000 X-Inumbo-ID: 606dbaa2-065d-4b85-8699-989412608bdc Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 606dbaa2-065d-4b85-8699-989412608bdc; Tue, 20 Oct 2020 12:00:51 +0000 (UTC) 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=uHlIz/z4uRF9R68bRtWybynZpCQOwe0wXxuZRBPwdKc=; b=64AmIrQTuhYHXQOeXzNZQAY2vr z/RhTTXQnVOqsnfb6VlDMm6K0uN3Grhr9/IMzbU5SRjTjKTQixbpjNWHQm/gr0Kb4LVAex4RTk3mk /acwcS0JANeTIgfxP0a3ebGq8SvoEWpQoqxibfX2ElfJtr5VnNoCrKqMGb9uzj/Hyd7A=; Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJo-0001KQ-1l; Tue, 20 Oct 2020 12:00:44 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1kUqJo-00021v-0d; Tue, 20 Oct 2020 12:00:44 +0000 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 345 v3 - x86: Race condition in Xen mapping code Message-Id: Date: Tue, 20 Oct 2020 12:00:44 +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 XSA-345 version 3 x86: Race condition in Xen mapping code UPDATES IN VERSION 3 ==================== Public release. ISSUE DESCRIPTION ================= The Xen code handling the updating of the hypervisor's own pagetables tries to use 2MiB and 1GiB superpages as much as possible to maximize TLB efficiency. Some of the operations for checking and coalescing superpages take non-negligible amount of time; to avoid potential lock contention, this code also tries to avoid holding locks for the entire operation. Unfortunately, several potential race conditions were not considered; precisely-timed guest actions could potentially lead to the code writing to a page which has been freed (and thus potentially already reused). IMPACT ====== A malicious guest can cause a host denial-of-service. Data corruption or privilege escalation cannot be ruled out. VULNERABLE SYSTEMS ================== Versions of Xen from at least 3.2 onward are affected. Only x86 systems are vulnerable. ARM systems are not vulnerable. Guests can only exercise the vulnerability if they have passed through hardware devices. Guests without passthrough configured cannot exploit the vulnerability. Furthermore, HVM and PVH guests can only exercise the vulnerability if they are running in shadow mode, and only when running on VT-x capable hardware (as opposed to SVM). This is believed to be Intel, Centaur and Shanghai CPUs. MITIGATION ========== Running all guests in HVM or PVH mode, in each case with HAP enabled, prevent those guests from exploiting the vulnerability. CREDITS ======= This issue was discovered by Hongyan Xia 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. xsa345/*.patch xen-unstable xsa345-4.14/*.patch Xen 4.14.x xsa345-4.13/*.patch Xen 4.12.x, Xen 4.13.x xsa345-4.11/*.patch Xen 4.11.x xsa345-4.10/*.patch Xen 4.10.x $ sha256sum xsa345* xsa345*/* c8b9445b05aa4c585d9817c2e6cbf08466452a15381ca5b9a0224a377522edf9 xsa345.meta 4ed69dce620449bedda29f3ce1ed767908d2bbeb888701e7c4c2461216b724f7 xsa345-4.10/0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch 98d3b171b197c1ff9f26ff70499a0cde3b23d048d622b12bf2ea0899de4f9e7f xsa345-4.10/0002-x86-mm-Refactor-modify_xen_mappings-to-have-one-exit.patch 78c4be2f1747051d13869001180ee25bdeabe5e8138d0604a33db610b24e38f1 xsa345-4.10/0003-x86-mm-Prevent-some-races-in-hypervisor-mapping-upda.patch 4abd8271a70593fcde683071fdf0ac342ff9b0859b60c9790b14dd7e5ae85129 xsa345-4.11/0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch 3209195c1a7e8a6186b704d6bb791a3fb3c251d59e15b42bcb0ecc0d38f13a4f xsa345-4.11/0002-x86-mm-Refactor-modify_xen_mappings-to-have-one-exit.patch 7e73f6c14718a0d4b25b4453b45c20bf265bd54c91b77678815be1ef7beae61f xsa345-4.11/0003-x86-mm-Prevent-some-races-in-hypervisor-mapping-upda.patch b68b82911c96feee9d05abcddf174c2f6b278829bc8c3bf3062739de8c4704b2 xsa345-4.12/0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch fe2a1568a3e273ae01b3984c193e75aea16da53c6c9db27d21a2196d0f204c6e xsa345-4.12/0002-x86-mm-Refactor-modify_xen_mappings-to-have-one-exit.patch 22c98f4a264bc6b15ed29da8698a733947849c16a3e9da58de88bf16986b6aad xsa345-4.12/0003-x86-mm-Prevent-some-races-in-hypervisor-mapping-upda.patch 16299d885c19e1cd378a856caf8c1d1365c341bea648c0a0d5f24ae7d56015ae xsa345-4.13/0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch b820061c242c7fa4da44cbb44fa16e0d0542c16815a89699385da0c87321f7ea xsa345-4.13/0002-x86-mm-Refactor-modify_xen_mappings-to-have-one-exit.patch 8a87ac2478c9bda6ef28c480b256448d51393a5e04f6e8a68ea29d9aeba92e47 xsa345-4.13/0003-x86-mm-Prevent-some-races-in-hypervisor-mapping-upda.patch acf093741fecccccce0018d4a5c0f5dba367373dd1d6d04ed76ff3f178579670 xsa345-4.14/0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch 616f2547b4bb6d5eb9f853b1659e6e2a1fc0f67866665f4f6cdd8d763effcdfc xsa345-4.14/0002-x86-mm-Refactor-modify_xen_mappings-to-have-one-exit.patch 17ae72d2af6759da17ce777e0fc9eef8f8eb6be3fe6d5b38b3589f641fc0f918 xsa345-4.14/0003-x86-mm-Prevent-some-races-in-hypervisor-mapping-upda.patch 65c56cb4d34ff4e97220311b303c09b54bfa44bcf4adc8e81d4a50c50eeb6b95 xsa345/0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch 5512bd167c29ba7da06b2ace1397fc43ed33a362174ea927d6ca3f9bdd31748b xsa345/0002-x86-mm-Refactor-modify_xen_mappings-to-have-one-exit.patch 392524c9b0a01618e6c86a39dc1c68288065300b49548e29e9e6672947858060 xsa345/0003-x86-mm-Prevent-some-races-in-hypervisor-mapping-upda.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 1kUqJf-0001Jq-T0; Tue, 20 Oct 2020 12:00:35 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1kUqJf-0001zq-Rt; Tue, 20 Oct 2020 12:00:35 +0000 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 332 v3 - Rogue guests can cause DoS of Dom0 via high frequency events Message-Id: Date: Tue, 20 Oct 2020 12:00:35 +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 XSA-332 version 3 Rogue guests can cause DoS of Dom0 via high frequency events UPDATES IN VERSION 3 ==================== Public release. ISSUE DESCRIPTION ================= The handling of Xen events in the Linux kernel runs with interrupts disabled in a loop until no further event is pending. Whenever an event has been accepted by the kernel, another event can come in via the same event channel. This can result in the event handling loop running for an extended time if new events are coming in at a high rate. In extreme cases this can lead to a complete hang of the kernel, resulting in a DoS situation of the host when dom0 is affected. IMPACT ====== Malicious guests can hang the host by sending events to dom0 at a high frequency. VULNERABLE SYSTEMS ================== All systems with a Linux dom0 are affected. All Linux kernel versions are affected. MITIGATION ========== There is no known mitigation. CREDITS ======= This issue was discovered by Julien Grall from Arm RESOLUTION ========== Applying the appropriate attached patches 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. xsa332-linux-??.patch Linux $ sha256sum xsa332* 92d0789e8e5b9ec7ae0cd8b01ef31e27930dbe9b81b727521d46328107f3c719 xsa332-linux-01.patch 0bd82febcaf7fc72b88082f46cae9b67f39786d03b3e6aae5f0789cf855e6143 xsa332-linux-02.patch e646b7caf11ded7f22b209635b209f50ac583cbaeb3270148ce66a3cd922f0c1 xsa332-linux-03.patch 9bed2213774a8107a2f2c157aeb0ebfda7cc6384cee0a245017b3a9eb28cff7f xsa332-linux-04.patch 8839af506b71946db35f223ff614aa92b4386aaf95e4d8b1408fbf31436ff80f xsa332-linux-05.patch b261706bd7f7120fadff0e928be366924cfc13418c81a67ad45724b4179e8a5c xsa332-linux-06.patch fc0c963a9a965fc7a72468b1a1ce0834dc866e77392ca0c1d9c8162457a526a0 xsa332-linux-07.patch 5d821c58dd7fcdb157c2844ba34675305c320de25f54409305ffcba610d5922b xsa332-linux-08.patch 242eb83eca8e3b6d2d303e2943aa041b5f19ea54242cd0de20252d2ae3d128d1 xsa332-linux-09.patch 70a042006d1df3dbbefc4c7d4dfd50da8f3a8e47ee77c2d6d0ba1eda405ae574 xsa332-linux-10.patch ebbfa66d11b8c81353b72ed5f381672e6784a67895df482f7e791a9fb4c6fbf0 xsa332-linux-11.patch cda1cbcca19860d43804e80ec2d7d13b295a140b42aa7d16118bb2d20bd63cae xsa332-linux-12.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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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 346 v2 - undue deferral of IOMMU TLB flushes Message-Id: Date: Tue, 20 Oct 2020 12:00:46 +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 XSA-346 version 2 undue deferral of IOMMU TLB flushes UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= To efficiently change the physical to machine address mappings of a larger range of addresses for fully virtualized guests, Xen contains an optimization to coalesce per-page IOMMU TLB flushes into a single, wider flush after all adjustments have been made. While this is fine to do for newly introduced page mappings, the possible removal of pages from such guests during this operation should not be "optimized" in the same way. This is because the (typically) final reference of such pages is dropped before the coalesced flush, and hence the pages may have been put to a different use even though DMA initiated by their original owner mightstill be in progress. IMPACT ====== A malicious guest might be able to cause data corruption and data leaks. Host or guest Denial of Service (DoS), and privilege escalation, cannot be ruled out. VULNERABLE SYSTEMS ================== All Xen versions from 4.2 onwards are vulnerable. Xen versions 4.1 and earlier are not vulnerable. Only x86 HVM and PVH guests can leverage the vulnerability. Arm guests as well as x86 PV ones cannot leverage the vulnerability. Only x86 HVM and PVH guests which have physical devices passed through to them can leverage the vulnerability. Only x86 HVM and PVH guests configured to not share IOMMU and CPU page tables can leverage the vulnerability. Sharing these page tables is the default on capable Intel (VT-d) hardware. On AMD hardware sharing is not possible. On Intel (VT-d) hardware sharing may also not be possible, depending on hardware properties. Whether it is possible can be seen from the presence (or absence) of "iommu_hap_pt_share" on the "virt_caps" line of "xl info" output. Guests run in shadow mode can leverage the vulnerability. MITIGATION ========== Not passing through physical devices to untrusted guests will avoid the vulnerability. On systems permitting page table sharing, not suppressing use of the functionality will allow to avoid the vulnerability. This means guests should not be run in * shadow mode, i.e. hardware needs to be HAP (Hardware Assisted Paging) capable, there should not be "hap=0" in the guest's xl configuration file, and there should not be "hap=0" or equivalent on Xen's command line, * non-shared page table mode, i.e. hardware needs to be capable of sharing, there should not be "passthrough=sync_pt" in the guest's xl configuration file, and there should not be "iommu=no-sharept" or equivalent on Xen's command line. CREDITS ======= This issue was discovered by Jan Beulich of SUSE. RESOLUTION ========== Applying the appropriate pair of attached patches 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. xsa346/xsa346-?.patch Xen 4.14 - xen-unstable xsa346/xsa346-4.13-?.patch Xen 4.13 xsa346/xsa346-4.12-?.patch Xen 4.12 xsa346/xsa346-4.11-?.patch Xen 4.11 xsa346/xsa346-4.10-?.patch Xen 4.10 $ sha256sum xsa346* xsa346*/* ba560d34cb46f45d6da0ba5d672cb896c173e90de5c022d22415ace20c5e47b8 xsa346.meta 5f8b3e5565bc7d87283af173f5f2b35975e4ab6bff502780799d14fb263f730d xsa346/xsa346-1.patch 9de89ca360f303e7aa3b42529cdf4191b0700ee7cb6928a22068195e047a4db7 xsa346/xsa346-2.patch f3612bfad219160917a3bc46ea5b31673137593d62ae4f819a8e80ade0339c5b xsa346/xsa346-4.10-1.patch 734ed82d583bbce342ffabeb9dd84e300f2717ec71e3de866670b0ddf18d57aa xsa346/xsa346-4.10-2.patch 7a41bf06e19590cfc69d4f2ac132a23843dcec2ea5f98d86c4be971f9eec86af xsa346/xsa346-4.11-1.patch 1359801b8f64ac62dc8de4e3acc15ec42c040f692f3a1ee9986acb478ee330cd xsa346/xsa346-4.11-2.patch 190f594bb77dd044af8f0a051ab1d4143c348da192206da9b390af91c0a2cdec xsa346/xsa346-4.12-1.patch 5bcb65dc45f6d74c644ee6b6add518044c9875e6759254773d3816e718c2be28 xsa346/xsa346-4.12-2.patch 69e0158276a922829eb60dc5bb13e60a71a232ace808843f45dac407716b107b xsa346/xsa346-4.13-1.patch eb8132a02c252dc65be1f334939f252db0c30ae2db8aa23f0d9e67f8148e2d2d xsa346/xsa346-4.13-2.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. HOWEVER, deployment of the mitigations is NOT permitted (except where all the affected systems and VMs are administered and used only by organisations which are members of the Xen Project Security Issues Predisclosure List). Specifically, deployment on public cloud systems is NOT permitted. This is because removal of pass-through devices or their replacement by emulated devices is a guest visible configuration change, which may lead to re-discovery of the issue. Similarly the possible guest configuration changes can't be excluded to be noticeable to guests. Deployment of this mitigation is permitted only AFTER the embargo ends. AND: 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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Z25lZCBpbnQgc3BhY2UsCi0gICAgICAgICAgICAgICAgICAgICAgICAgICAg ICB1bmlvbiB4ZW5fYWRkX3RvX3BoeXNtYXBfYmF0Y2hfZXh0cmEgZXh0cmEs CisgICAgICAgICAgICAgICAgICAgICAgICAgICAgICB1bmlvbiBhZGRfdG9f cGh5c21hcF9leHRyYSBleHRyYSwKICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgIHVuc2lnbmVkIGxvbmcgaWR4LCBnZm5fdCBnZm4pOwogCiBpbnQg eGVubWVtX2FkZF90b19waHlzbWFwKHN0cnVjdCBkb21haW4gKmQsIHN0cnVj dCB4ZW5fYWRkX3RvX3BoeXNtYXAgKnhhdHAsCg== --=separator-- From xen-announce-bounces@lists.xenproject.org Tue Oct 20 12:03:21 2020 Return-path: Envelope-to: archives@lists.xen.org Delivery-date: Tue, 20 Oct 2020 12:03:21 +0000 Received: from list by lists.xenproject.org with outflank-mailman.9222.24676 (Exim 4.92) (envelope-from ) id 1kUqMI-0000Tj-FI; Tue, 20 Oct 2020 12:03:18 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 9222.24676; Tue, 20 Oct 2020 12:03:18 +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" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqMI-0000TV-9w; Tue, 20 Oct 2020 12:03:18 +0000 Received: by outflank-mailman (input) for mailman id 9222; Tue, 20 Oct 2020 12:03:16 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqKY-0006DX-L3 for xen-announce@lists.xen.org; Tue, 20 Oct 2020 12:01:30 +0000 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id b9c2b219-4455-492b-8042-7d7cd498203c; Tue, 20 Oct 2020 12:00:58 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJu-0001Kz-EE; Tue, 20 Oct 2020 12:00:50 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1kUqJu-00024u-DS; Tue, 20 Oct 2020 12:00:50 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqKY-0006DX-L3 for xen-announce@lists.xen.org; Tue, 20 Oct 2020 12:01:30 +0000 X-Inumbo-ID: b9c2b219-4455-492b-8042-7d7cd498203c Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id b9c2b219-4455-492b-8042-7d7cd498203c; Tue, 20 Oct 2020 12:00:58 +0000 (UTC) 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=B5LnVXlXyI7SkKLwT8enjVPAkqRwCrJ9IY42lFZWuuA=; b=LJXYwkyAbAZxNvk8wG8LaOi8Dq /xotufhCLTRSvZwGA5bgibsxBxMYGw7ccCcdJOYyXIJ7jfxkCMWRItgC16VzbmG2Ziw6hirYggkPU tP7PNEzR9ZClsawMKWLIF8uRjTRZlF9A6Gnr/gHmnApOErFWm2UZsj+Pq1h7h/P1KyaI=; Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kUqJu-0001Kz-EE; Tue, 20 Oct 2020 12:00:50 +0000 Received: from iwj by xenbits.xenproject.org with local (Exim 4.92) (envelope-from ) id 1kUqJu-00024u-DS; Tue, 20 Oct 2020 12:00:50 +0000 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 347 v2 - unsafe AMD IOMMU page table updates Message-Id: Date: Tue, 20 Oct 2020 12:00:50 +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 XSA-347 version 2 unsafe AMD IOMMU page table updates UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= AMD IOMMU page table entries are updated in a step by step manner, without regard to them being potentially in use by the IOMMU. Therefore it was possible that the IOMMU would read and then use a half-updated entry. Furthermore, updates to Device Table entries lacked suitable ordering enforcement for certain steps involved in these updates. In both case the specific outcome heavily depends on how exactly the compiler translated the affected pieces of code. IMPACT ====== A malicious guest might be able to cause data corruption and data leaks. Host or guest Denial of Service (DoS), and privilege escalation, cannot be ruled out. VULNERABLE SYSTEMS ================== All Xen versions are potentially vulnerable. Only x86 systems with AMD, Hygon, or compatible IOMMU hardware are vulnerable. Arm systems as well as x86 systems with VT-d hardware or without any IOMMUs in use are not vulnerable. Only x86 guests which have physical devices passed through to them can leverage the vulnerability. MITIGATION ========== Not passing through physical devices to untrusted guests will avoid the vulnerability. CREDITS ======= This issue was discovered by Paul Durrant of Amazon and Jan Beulich of SUSE. RESOLUTION ========== Applying the appropriate set of attached patches 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. xsa347/xsa347-?.patch xen-unstable xsa347/xsa347-4.14-?.patch Xen 4.14 xsa347/xsa347-4.13-?.patch Xen 4.13 xsa347/xsa347-4.12-?.patch Xen 4.12 xsa347/xsa347-4.11-?.patch Xen 4.10 - 4.11 $ sha256sum xsa347* xsa347*/* f16e1a348b0e45601c96b2bd08afc4202bbccc92c8af8344b3c8286ca819acef xsa347.meta 82e14d0507ec94f8cfac2b4d5d1b60681b925218ab927332bee338e6b6c679c9 xsa347/xsa347-1.patch 1bc6018c3685727ba4035bf0b5cea95940a1b9c4746fa9bddfd41507482d68a1 xsa347/xsa347-2.patch f1bd8eba268300f564837ac37fe43b774ace885c9cbf8fcacae457128730bc80 xsa347/xsa347-3.patch 5aec8f3b15aa799e1ff7ec0dfe53523cb91aa5fd88033f7f034cb74ebaa6abe4 xsa347/xsa347-4.11-1.patch 4ab3a6fa181ce486b4c9943f6629b7c1a4337c7ccb92701ae6e40108533778ca xsa347/xsa347-4.11-2.patch fec82340dc65fc1001358de51d0639b2b401818fa1e831f8715cb1780b17dc7b xsa347/xsa347-4.12-1.patch be89e976fe03464ce3a73b162c07927128f41a8a03466e903ebfa4ea0dc46116 xsa347/xsa347-4.12-2.patch 5dc0abf73d1a9d21f2b57e6c57ee5c15cc3febbb783123c0946f3e5778671929 xsa347/xsa347-4.13-1.patch 6d2b6ea7a373fb1c4cce63db349bbafa8603b5e7c6b74fc6d029954075f2268d xsa347/xsa347-4.13-2.patch 4e154bfca5101569c8260e307eb6439783bc99547b7dfb5aba2bafebbde46190 xsa347/xsa347-4.13-3.patch 6a70c2afba0d3ad73b12743a6808ba8002e9ee573d7c460397355e40de3b553f xsa347/xsa347-4.14-1.patch 1bc6018c3685727ba4035bf0b5cea95940a1b9c4746fa9bddfd41507482d68a1 xsa347/xsa347-4.14-2.patch f1bd8eba268300f564837ac37fe43b774ace885c9cbf8fcacae457128730bc80 xsa347/xsa347-4.14-3.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. HOWEVER, deployment of the mitigation is NOT permitted (except where all the affected systems and VMs are administered and used only by organisations which are members of the Xen Project Security Issues Predisclosure List). Specifically, deployment on public cloud systems is NOT permitted. This is because removal of pass-through devices or their replacement by emulated devices is a guest visible configuration change, which may lead to re-discovery of the issue. Deployment of this mitigation is permitted only AFTER the embargo ends. AND: 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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