Date: Thu, 27 Jul 2023 13:48:29 -0400 From: Shawn Webb <shawn.webb@hardenedbsd.org> To: Jung-uk Kim <jkim@FreeBSD.org> Cc: mike tancsa <mike@sentex.net>, 0x1eef <0x1eef@protonmail.com>, "freebsd-security@freebsd.org" <freebsd-security@freebsd.org> Subject: Re: Zenbleed Message-ID: <20230727174829.les2d7wvabekkiu7@mutt-hbsd> In-Reply-To: <c7f4e796-01ce-b51e-e7ab-ba4d0884ce8a@FreeBSD.org> References: <G8KdlREJ53JvhucNV2MkjySsZ4qqs6ZdHFXJaFqDIvXj5usSBEr3pOe29JoQVHgjtctmrIOR7O1PHwchvf_cGLr53jbwNGPy_F7_9OstBCE=@protonmail.com> <20230726214636.yblem2s4sgapb6cw@mutt-hbsd> <b87b0b4e-617d-1c0c-10f5-d5b407d8b485@sentex.net> <ea4be08a-0b8f-e17c-9b71-e072f7e74447@FreeBSD.org> <c7f4e796-01ce-b51e-e7ab-ba4d0884ce8a@FreeBSD.org>
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[-- Attachment #1 --] On Thu, Jul 27, 2023 at 01:38:09PM -0400, Jung-uk Kim wrote: > On 23. 7. 27., Jung-uk Kim wrote: > > On 23. 7. 27., mike tancsa wrote: > > > On 7/26/2023 5:46 PM, Shawn Webb 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. > > > > 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. > > > > > > Thanks for that. Is there a way to compile on RELENG_12 or is it 13 > > > only ? > > > > > > % gmake > > > cc -O0 -ggdb3 -march=znver2 -c -o pattern.o pattern.c > > > pattern.c:15:10: fatal error: 'sys/sysinfo.h' file not found > > > #include <sys/sysinfo.h> > > > ^~~~~~~~~~~~~~~ > > > 1 error generated. > > > gmake: *** [<builtin>: pattern.o] Error 1 > > > > I guess you checked out a wrong branch. Please see the attached minimal > > patch I made for FreeBSD. I think it will work on any supported FreeBSD > > branches. Note the original exploit is available from here: > > > > https://lock.cmpxchg8b.com/files/zenbleed-v5.tar.gz Awesome! Thanks! I'll incorporate that patch later today. Thanks again, -- Shawn Webb Cofounder / Security Engineer HardenedBSD https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEA6TL67gupaZ9nzhT/y5nonf44foFAmTCrecACgkQ/y5nonf4 4fo7xQ/+ISDEwYlLwCxxI2RHiu5zMomZf0s+KHe5gKEl93SRoWT6tiTTPt8baBfE 8tFnxbBZpUQBxQ7nbBz0gvd+k1PmypmAyCSES+eRtKocpn1GVxmE1aiPAUsz6DfN CN/ledV5vhm/Svca6plf2JRruAToXKLV77GmlRnWsmiqInOT4LgM0fP8XuaJHm4k QIBwHtXz1Ajp0J+iHqE2CtmGZZBDOeondpqt6xYxkNzuKbIH/U/JTN77SO1iXZ/1 kfsg+TkFKtK2DIT9ahgynygqdIsD7t1dGXnwOgb5LuTbEZ3XTVenw84EcOZNmx62 Rhwjym0Fb+i+jGIMl4r2/9m0Zb23jS8zZzfd1RKi+tdWz99FZPvpExVKw0am+1hV Sv4w9oUaP3nuoijTMBPirapR/SRWbpkTCyXCW0+hAwlkGHAdJNpXipamQhzxQnLf BYgXjdWKOxD/CwP/+UmRKTZ0RRqBBxVaHG3obmaSEmHG7/427qrNcS2S4+Me5QRy 1wv5cU2fuOMPkVy8ch+Vj3vKSKeHN07Xm2ecVOC2FEQct+ZAzuKEqaQTy9hEvtZa XMJRfJz0acpxVigRch3qA21/stUOrKFF+Fb/GvYkba59M5gKzurYmPEYHz9fyFZK rxyRPppulKzcAjlWdCaipuGXqawko45qi8cptWOqOJ/bwwwvC0A= =gmwQ -----END PGP SIGNATURE-----help
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