Date: Wed, 26 Jul 2023 17:46:36 -0400 From: Shawn Webb <shawn.webb@hardenedbsd.org> To: 0x1eef <0x1eef@protonmail.com> Cc: "freebsd-security@freebsd.org" <freebsd-security@freebsd.org> Subject: Re: Zenbleed Message-ID: <20230726214636.yblem2s4sgapb6cw@mutt-hbsd> In-Reply-To: <G8KdlREJ53JvhucNV2MkjySsZ4qqs6ZdHFXJaFqDIvXj5usSBEr3pOe29JoQVHgjtctmrIOR7O1PHwchvf_cGLr53jbwNGPy_F7_9OstBCE=@protonmail.com> References: <G8KdlREJ53JvhucNV2MkjySsZ4qqs6ZdHFXJaFqDIvXj5usSBEr3pOe29JoQVHgjtctmrIOR7O1PHwchvf_cGLr53jbwNGPy_F7_9OstBCE=@protonmail.com>
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--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--
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