From nobody Wed Jul 26 22:20:25 2023 X-Original-To: freebsd-security@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4RB7dN3qSSz4p0yY for ; Wed, 26 Jul 2023 22:20:40 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4RB7dM3kbqz3M4L for ; Wed, 26 Jul 2023 22:20:39 +0000 (UTC) (envelope-from kostikbel@gmail.com) Authentication-Results: mx1.freebsd.org; dkim=none; spf=softfail (mx1.freebsd.org: 2001:470:d5e7:1::1 is neither permitted nor denied by domain of kostikbel@gmail.com) smtp.mailfrom=kostikbel@gmail.com; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=gmail.com (policy=none) Received: from tom.home (kib@localhost [127.0.0.1]) by kib.kiev.ua (8.17.1/8.17.1) with ESMTPS id 36QMKPpt039565 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO) for ; Thu, 27 Jul 2023 01:20:28 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua 36QMKPpt039565 Received: (from kostik@localhost) by tom.home (8.17.1/8.17.1/Submit) id 36QMKPr8039564 for freebsd-security@freebsd.org; Thu, 27 Jul 2023 01:20:25 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Thu, 27 Jul 2023 01:20:25 +0300 From: Konstantin Belousov To: "freebsd-security@freebsd.org" Subject: Re: Zenbleed Message-ID: References: List-Id: Security issues List-Archive: https://lists.freebsd.org/archives/freebsd-security List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-security@freebsd.org X-BeenThere: freebsd-security@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FORGED_GMAIL_RCVD,FREEMAIL_FROM, NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-14) on tom.home X-Spamd-Result: default: False [-2.88 / 15.00]; NEURAL_HAM_SHORT(-1.00)[-1.000]; NEURAL_HAM_LONG(-0.97)[-0.968]; NEURAL_HAM_MEDIUM(-0.91)[-0.912]; MIME_GOOD(-0.10)[text/plain]; DMARC_POLICY_SOFTFAIL(0.10)[gmail.com : No valid SPF, No valid DKIM,none]; RCVD_COUNT_THREE(0.00)[3]; ASN(0.00)[asn:6939, ipnet:2001:470::/32, country:US]; R_DKIM_NA(0.00)[]; TO_DN_EQ_ADDR_ALL(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; MLMMJ_DEST(0.00)[freebsd-security@freebsd.org]; FROM_EQ_ENVFROM(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; R_SPF_SOFTFAIL(0.00)[~all]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_FROM(0.00)[gmail.com]; PREVIOUSLY_DELIVERED(0.00)[freebsd-security@freebsd.org]; TO_MATCH_ENVRCPT_ALL(0.00)[]; HAS_XAW(0.00)[]; RCVD_TLS_LAST(0.00)[] X-Rspamd-Queue-Id: 4RB7dM3kbqz3M4L X-Spamd-Bar: -- On Wed, Jul 26, 2023 at 08:34:56PM +0000, 0x1eef wrote: > Hello, > > I was curious if there are plans to apply the "chicken bit" > workaround for the Ryzen line of processors. A firmware > update is not scheduled to be released until Nov or Dec > at the earliest. Thanks. The chicken bit workaround is # for x in /dev/cpuctl*; do cpucontrol -m '0xc0011029|=0x200' $x; done there is nothing to wait for. It is silly to push this into kernel when recommended solution is ucode update.