Re: Zenbleed
- In reply to: Jung-uk Kim : "Re: Zenbleed"
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Date: Thu, 27 Jul 2023 17:48:29 UTC
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