I know the 63xx has a very fatal NMI exploit, but according to the libreboot (oh no) website the 62xx works safely out of the box without microcode however I would like to confirm if this is actually true.
I looked at the errata .pdf from the AMD website but I didn't see anything that seemed significant.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
On 01/24/2017 10:55 PM, Taiidan@gmx.com wrote:
I know the 63xx has a very fatal NMI exploit, but according to the libreboot (oh no) website the 62xx works safely out of the box without microcode however I would like to confirm if this is actually true.
I looked at the errata .pdf from the AMD website but I didn't see anything that seemed significant.
As far as we have been able to determine it does, again with the caveat that this is without microcode _updates_, not without microcode. There is still the off chance that these CPUs ship with a backdoor inside the burnt microcode ROM that is patched out with an update. Unlike POWER and ARM we are solely dependent on the vendor being trustworthy enough to disclose issues in their errata document; outside of that, there is simply no feasible way to know for certain what bugs are lurking inside the CPU.
- -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 (direct line) +1 (512) 690-0200 (switchboard) https://www.raptorengineering.com
On Wed, Jan 25, 2017 at 11:24 AM, Timothy Pearson tpearson@raptorengineering.com wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
On 01/24/2017 10:55 PM, Taiidan@gmx.com wrote:
I know the 63xx has a very fatal NMI exploit, but according to the libreboot (oh no) website the 62xx works safely out of the box without microcode however I would like to confirm if this is actually true.
I looked at the errata .pdf from the AMD website but I didn't see anything that seemed significant.
As far as we have been able to determine it does, again with the caveat that this is without microcode _updates_, not without microcode. There is still the off chance that these CPUs ship with a backdoor inside the burnt microcode ROM that is patched out with an update. Unlike POWER and ARM we are solely dependent on the vendor being trustworthy enough to disclose issues in their errata document; outside of that, there is simply no feasible way to know for certain what bugs are lurking inside the CPU.
POWER and ARM parts can have microcode too. That's up to the implementation. I'm not sure how you can distinguish the difference. Because one posts an update vs others never indicating there is an update? Even if parts have no microcode, there's a possibility of backdoors baked into the silicon. In all situations one needs to trust the vendor.
Timothy Pearson Raptor Engineering +1 (415) 727-8645 (direct line) +1 (512) 690-0200 (switchboard) https://www.raptorengineering.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
iQEcBAEBAgAGBQJYiN81AAoJEK+E3vEXDOFbcPYH/Rgpgzt9GcVQrcZPAfelMumo O7miIjEKRj9m0EUJZRmIXZjMPuTHOLRDI6IaVt2kvuZM9voLsKkeSqOKjOHwKT0C Bn3Biir4+shbe8zOgSyp3ZYkReDIW3BkrGBzjGaoMSV+mtwevc0t4aly8vicXm2N J0H5ELq54Z8NWP9imujpM8Ok8+6QJCE7G9cYYRJsqxVLrZulxzYO19tXIBsZJR8q sBEV7uBIWIXznd9/3sv9RBLTYQ3N0VwNvBkEbUH3xpfOjLt+Wq3x/uP2NQtlnKxY FzQhwQXWM+oE2ccHx86Wkb6WlgFX8mxuDmYsD49fLZ1gvzRK7JSsSFsS48qEm/I= =4qDj -----END PGP SIGNATURE-----
-- coreboot mailing list: coreboot@coreboot.org https://www.coreboot.org/mailman/listinfo/coreboot
-
Aaron Durbin -
Taiidan＠gmx.com -
Timothy Pearson