Opteron Exposed: Reverse Engineering AMD K8 Microc

By: Igor ((Not Given)), July 23, 2004 10:00 pm
Room: Moderated Discussions
tom vier (no@thanks.net) on 7/22/04 wrote:
---------------------------
>if you can write protect your mobo's flash, it's not as big a deal. i wonder how
>much ucode rom intel had to add to support the update decryption.

Write-protecting flash wouldn't help much, it would only prevent you from making the hack permanent by flashing it into the BIOS. Anyway, you can issue an update at any time provided that you run it in kernel mode because WRMSR is privileged instruction.

As far as Intel is concerned I doubt that their protection is much stronger. I have seen small repeating sequences in their updates for the processors that have the same family. Only when model number changes do they become completely different. Stepping doesn't matter much. What I think is that they change encryption/decription codes when they perform a mask shrinking (as you know, F1x was 0.18u P4 core, F2x was 0.13u and now F3x is 0.09u core).
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TopicPosted ByDate
Opteron Exposed: Reverse Engineering AMD K8 Microcode UpdatesAnonymous2004/07/22 01:39 AM
  Opteron Exposed: Reverse Engineering AMD K8 MicrocDresdenboy2004/07/22 05:13 AM
    Opteron Exposed: Reverse Engineering AMD K8 MicrocAK2004/07/22 08:49 AM
      Opteron Exposed: Reverse Engineering AMD K8 MicrocDresdenboy2004/07/22 10:26 AM
        the former posting has no new text, continue hereDresdenboy2004/07/22 10:32 AM
  An additionDresdenboy2004/07/22 08:04 AM
    An additionAnonymous2004/07/22 02:32 PM
      An additionDresdenboy2004/07/22 02:55 PM
  Opteron Exposed: Reverse Engineering AMD K8 Microctom vier2004/07/22 08:38 AM
    Opteron Exposed: Reverse Engineering AMD K8 MicrocWouter Tinus2004/07/22 08:56 AM
    Opteron Exposed: Reverse Engineering AMD K8 MicrocIgor2004/07/23 10:00 PM
      Opteron Exposed: Reverse Engineering AMD K8 MicrocKronos2004/07/24 02:04 PM
  Opteron Exposed: Reverse Engineering AMD K8 Microcode UpdatesMax2004/07/22 01:01 PM
    Opteron Exposed: Reverse Engineering AMD K8 Microcode UpdatesAnonymous2004/07/22 05:26 PM
  Does that means..._Arthur2004/07/22 10:01 PM
    Does that means...Dresdenboy2004/07/23 03:27 AM
    Does that means...Jan2004/07/23 07:51 AM
      Does that means...Anonymous2004/07/23 03:10 PM
        Does that means...Igor2004/07/23 10:42 PM
          Does that means...Anonymous2004/07/24 09:53 PM
            Does that means...Igor2004/07/25 12:08 AM
            Does that means...Anonymous2004/07/25 12:17 AM
              Does that means...anonymous2004/07/25 04:31 PM
                Does that means...Igor2004/07/26 08:42 PM
  Permanent virusess.chauhan2004/07/27 12:25 AM
    Permanent virusesAnonymous2004/07/27 10:42 AM
  Finding candidates to replace their microcodeDresdenboy2004/08/19 02:06 AM
    Finding candidates to replace their microcodePaul DeMone2004/08/19 06:22 AM
      Finding candidates to replace their microcodeDavid Kanter2004/08/19 06:53 AM
        Finding candidates to replace their microcodefoobar2004/08/19 09:55 AM
          Finding candidates to replace their microcodeDavid Kanter2004/08/19 10:58 AM
          Finding candidates to replace their microcodeAnonymous2004/08/20 01:56 PM
            Finding candidates to replace their microcodehobold2004/08/23 03:14 PM
      Finding candidates to replace their microcodeDresdenboy2004/08/19 10:59 AM
        Finding candidates to replace their microcodeanonymous2004/08/19 03:35 PM
        Finding candidates to replace their microcodeAnonymous2004/08/20 02:23 PM
          Finding candidates to replace their microcodeGroo2004/08/20 09:25 PM
          Finding candidates to replace their microcodeDresdenboy2004/08/21 05:01 AM
            Finding candidates to replace their microcodeAnonymous2004/08/21 04:45 PM
              Finding candidates to replace their microcodeanonymous2004/08/21 09:45 PM
      Finding candidates to replace their microcodeMatt Craighead2004/08/19 01:18 PM
      Finding candidates to replace their microcodeRick C. Hodgin2004/08/21 04:58 AM
        Finding candidates to replace their microcodeanonymous2004/08/21 09:41 PM
          Finding candidates to replace their microcodeRick C. Hodgin2004/08/22 08:31 AM
            Finding candidates to replace their microcodeanonymous2004/08/23 08:56 AM
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