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 Jung-uk Kim
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