From nobody Wed Jul 26 21:46:36 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 4RB6t8274kz4pWxG for ; Wed, 26 Jul 2023 21:46:40 +0000 (UTC) (envelope-from shawn.webb@hardenedbsd.org) Received: from mail-il1-x12c.google.com (mail-il1-x12c.google.com [IPv6:2607:f8b0:4864:20::12c]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4RB6t72DyWz4MHt for ; Wed, 26 Jul 2023 21:46:39 +0000 (UTC) (envelope-from shawn.webb@hardenedbsd.org) Authentication-Results: mx1.freebsd.org; none Received: by mail-il1-x12c.google.com with SMTP id e9e14a558f8ab-348d6bc349eso915475ab.0 for ; Wed, 26 Jul 2023 14:46:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hardenedbsd.org; s=google; t=1690407998; x=1691012798; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=ZxHm07oyG7O7UxhrBwGpdiAbfKpvEx1scBoOvDKkONs=; b=kKiKol4dB7SVSZMF3TkJf8D9FqiZ768Ck0bqDm180N3vv/cU+lSlZHwGO/TQPmQjFt JlqIpz5CV7y5Ct8zZ6POK/UnDOwHsF2AgAKav682uPpP4M/91H8xxifUf7XPOXwNILKA hf/3Tqc8oJmuVmIM/YkFGakKNZ/CJXyXY7iYqq2DKbrWUIqkvFUYz7ZwgbTC99TCtIKI 0MxEQEj0tk7W9rM8AYsh1Vpvp/AHWrp8AVsehVaHAunmaqE7QUxGeH1Pby+bRSYS96J7 mAVTGd5kXYijoz9AenSuOwJAzzRKBgvGDoLX5DFQJmfhdYiTI5Y6hi04Kifn50/ftnX7 cVSg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690407998; x=1691012798; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=ZxHm07oyG7O7UxhrBwGpdiAbfKpvEx1scBoOvDKkONs=; b=czgxYptxE0y/iNWX3eVqpyKqC1a3tR3B5rVJBhsI4U5deVAfW3sdCF0rW0t2iD7Ofh OfqFkxOvfSdOtzbTXj40wb8WLkBHtBmFAq4ZxXOjZPEFvH5WX4Fg6LTziF1ugXvAvwsy imPhTPlbqMx0qf1pNeE3LVP2t4cmTFW7IN0iRlOCUHnqNZ2k/tRytnWLa2rYbLSQRq5n IuPHjxUEc8iYJuJ6PqFi0ciSLwJrFEGpizF1Hb0AaooF4ikk5nhc4P+EGdDHzx5UawO1 6LMNn3y8e3IwTMKvS2e3VxC3u+7Href2PHxERX6sjbcGEmzdpGkdA3VulRch0KWmdQ04 su7w== X-Gm-Message-State: ABy/qLaKxPZNGV2CYbvYqfnbDWcQIGSssR97AYPzKfc6JM+RUeF4zrD9 /plD9qV4rmDkIfE/j7o2NNFbUg== X-Google-Smtp-Source: APBJJlFR4TXwBkAioTypnbhwqgih+ZnGH4ntdNNAeuIB1porGY3BEVp/zoRwmQ8B1PGqHji2gF9EMA== X-Received: by 2002:a05:6e02:1aa7:b0:348:d52a:8f8 with SMTP id l7-20020a056e021aa700b00348d52a08f8mr3881348ilv.25.1690407998052; Wed, 26 Jul 2023 14:46:38 -0700 (PDT) Received: from mutt-hbsd ([98.38.198.52]) by smtp.gmail.com with ESMTPSA id q5-20020a92d405000000b00348edca2abesm64313ilm.47.2023.07.26.14.46.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jul 2023 14:46:36 -0700 (PDT) Date: Wed, 26 Jul 2023 17:46:36 -0400 From: Shawn Webb To: 0x1eef <0x1eef@protonmail.com> Cc: "freebsd-security@freebsd.org" Subject: Re: Zenbleed Message-ID: <20230726214636.yblem2s4sgapb6cw@mutt-hbsd> X-Operating-System: FreeBSD mutt-hbsd 14.0-CURRENT-HBSD FreeBSD 14.0-CURRENT-HBSD X-PGP-Key: https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/blob/master/Shawn_Webb/03A4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc 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: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="pz3mje32tk7f4blc" Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 4RB6t72DyWz4MHt X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated --pz3mje32tk7f4blc Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jul 26, 2023 at 08:34:56PM +0000, 0x1eef wrote: > Hello, >=20 > I was curious if there are plans to apply the "chicken bit"=20 > workaround for the Ryzen line of processors. A firmware > update is not scheduled to be released until Nov or Dec=20 > at the earliest. Thanks. For those that would like to test if their systems are affected, this proof-of-concept was reported to work on at least one system: https://git.hardenedbsd.org/shawn.webb/zenbleed/-/tree/shawn.webb/bsd/main Building it depends on gmake and nasm. You'll want to be on the shawn.webb/bsd/main branch. Note that this code is simply Tavis' original PoC, just modified enough to get it to build on FreeBSD and OpenBSD. Thanks, --=20 Shawn Webb Cofounder / Security Engineer HardenedBSD https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A= 4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc --pz3mje32tk7f4blc Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEA6TL67gupaZ9nzhT/y5nonf44foFAmTBlDMACgkQ/y5nonf4 4fqRCQ//R1NI9N4Ka1hYAMYWsWRHwbBYbt/vWmWnIjFEZjc9HSzt6Vulu+uYerDh stiJZA67VqbQDq9K/0N+eQLhJUCy0RZfWcj3KI2YBRUbxJVvSXYnHgEW+HUeV0WY aq4NSoE+N7NEwz0F12996+W2mPt+YRK3osc29PQcVJ0NdK5AaWb+u0/NlYpgdQzt 2DssXV8/LrvJ+HvkS/K5IIiLjjVAFr+rRQ+UDyK17Tkebdo2EUCJ5Z5OVxQM8rrE US/FhoIoBTTfz6doP8a2MIT5eb0B/iTuHpyxAznC4iQs1iL1Jzt/4fEUpetRZnPR Y76Zmup2F0vTknXhfKI2Eph7ULXhmanixP4aX6kbVsNkUbTpN9wDURUQZbUweoDc C5Z94tBzLpeNTZQkALQlBgMvvJu4ETULdnwa/Rh6SsQ/1A/hQKjzHtTZBlFwjEYc /5RunRwnnRKbzQf0oUpmmorWM1cdwGZovOf0yPo1cfpbBTztULsahm1VIZxbkGEK puXrDKNAQHhwYF48mCfGro4Divk/VebY4anJscqVSO6heIW/hK6G9HFYOfOXTck+ BNlKRS311tW694LaGwC7oodLE2PQo5W2X0nQq25iRuKgiBbkUl1oYau3YuT6LNsV TAcGtSSIWqWhgMwn4INLExVdXL0SQBLSiW2STyU1kSkpZqsj268= =K3Tb -----END PGP SIGNATURE----- --pz3mje32tk7f4blc--