From nobody Sun Jul 30 16:45:56 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 4RDS1T2DQGz4pCt7 for ; Sun, 30 Jul 2023 16:46:00 +0000 (UTC) (envelope-from tom@hur.st) Received: from eda.aagh.net (eda.aagh.net [IPv6:2a02:c206:2085:1375::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-signature ECDSA (P-256) client-digest SHA256) (Client CN "eda.aagh.net", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4RDS1M0pRtz4NKP for ; Sun, 30 Jul 2023 16:45:58 +0000 (UTC) (envelope-from tom@hur.st) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=hur.st header.s=20220420 header.b=tkl7ABA9; spf=pass (mx1.freebsd.org: domain of tom@hur.st designates 2a02:c206:2085:1375::1 as permitted sender) smtp.mailfrom=tom@hur.st; dmarc=pass (policy=reject) header.from=hur.st DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hur.st; s=20220420; t=1690735557; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type:in-reply-to:in-reply-to: references:references; bh=EvRUZ6KMsG29AUfPrMgdAjSQS6YDqyLpNv4xFWuiM60=; b=tkl7ABA95CVfPUzwZV1rrJKw8hCtbl+uzlyrhWGSydQNvEm1O4ZLrAwxr40ltpCBA53i4p GQTOVg80jAf4cYjtQgXdpaPfULXncxvGzWqaP7lAuS13wS0D6uDYv+SObfDdRY55xRfB69 nzX/h/2ha4CrfWYOPMYqaYAY3W65mio= Received: from voi.aagh.net (voi-mgt.aagh.net [10.0.0.1]) by eda.aagh.net (OpenSMTPD) with ESMTPS id 34aec059 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO) for ; Sun, 30 Jul 2023 16:45:57 +0000 (UTC) Received: from freaky by voi.aagh.net with local (Exim 4.96 (FreeBSD)) (envelope-from ) id 1qQ9YK-0005Gs-2M for freebsd-security@freebsd.org; Sun, 30 Jul 2023 16:45:56 +0000 Date: Sun, 30 Jul 2023 16:45:56 +0000 From: Thomas Hurst 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: Organization: Not much. User-Agent: Mutt/2.2.10 (2023-03-25) Sender: Thomas Hurst X-Spamd-Result: default: False [-3.93 / 15.00]; NEURAL_HAM_LONG(-1.00)[-0.998]; NEURAL_HAM_SHORT(-0.98)[-0.980]; NEURAL_HAM_MEDIUM(-0.95)[-0.951]; DMARC_POLICY_ALLOW(-0.50)[hur.st,reject]; R_SPF_ALLOW(-0.20)[+a]; R_DKIM_ALLOW(-0.20)[hur.st:s=20220420]; MIME_GOOD(-0.10)[text/plain]; DKIM_TRACE(0.00)[hur.st:+]; MLMMJ_DEST(0.00)[freebsd-security@freebsd.org]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; HAS_ORG_HEADER(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_LAST(0.00)[]; FROM_HAS_DN(0.00)[]; FREEFALL_USER(0.00)[tom]; RCPT_COUNT_ONE(0.00)[1]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-security@freebsd.org]; ASN(0.00)[asn:51167, ipnet:2a02:c206::/32, country:DE] X-Rspamd-Queue-Id: 4RDS1M0pRtz4NKP X-Spamd-Bar: --- * Konstantin Belousov (kostikbel@gmail.com) wrote: > 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. I created an rc script for this, including a check that the system is actually running a Zen 2 CPU: https://gist.github.com/Freaky/2560975d3c94246b86f464b8be75c967 -- Thomas 'Freaky' Hurst https://hur.st/